2nthrt (problem 3.4.6)

Percentage Accurate: 53.3% → 86.5%

Time: 20.4s

Alternatives: 21

Speedup: 2.5×

• could not determine a ground truth

  1. x = -1.2461787707657602e+297
  2. n = -1.0269488017555498e+92

Specification

Math

\[\begin{array}{l} \\ {\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (- (pow (+ x 1.0) (/ 1.0 n)) (pow x (/ 1.0 n))))

C

double code(double x, double n) {
	return pow((x + 1.0), (1.0 / n)) - pow(x, (1.0 / n));
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    code = ((x + 1.0d0) ** (1.0d0 / n)) - (x ** (1.0d0 / n))
end function

Java

public static double code(double x, double n) {
	return Math.pow((x + 1.0), (1.0 / n)) - Math.pow(x, (1.0 / n));
}

Python

def code(x, n):
	return math.pow((x + 1.0), (1.0 / n)) - math.pow(x, (1.0 / n))

Julia

function code(x, n)
	return Float64((Float64(x + 1.0) ^ Float64(1.0 / n)) - (x ^ Float64(1.0 / n)))
end

MATLAB

function tmp = code(x, n)
	tmp = ((x + 1.0) ^ (1.0 / n)) - (x ^ (1.0 / n));
end

Wolfram

code[x_, n_] := N[(N[Power[N[(x + 1.0), $MachinePrecision], N[(1.0 / n), $MachinePrecision]], $MachinePrecision] - N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]

Initial Program: 53.3% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ {\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (- (pow (+ x 1.0) (/ 1.0 n)) (pow x (/ 1.0 n))))

C

double code(double x, double n) {
	return pow((x + 1.0), (1.0 / n)) - pow(x, (1.0 / n));
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    code = ((x + 1.0d0) ** (1.0d0 / n)) - (x ** (1.0d0 / n))
end function

Java

public static double code(double x, double n) {
	return Math.pow((x + 1.0), (1.0 / n)) - Math.pow(x, (1.0 / n));
}

Python

def code(x, n):
	return math.pow((x + 1.0), (1.0 / n)) - math.pow(x, (1.0 / n))

Julia

function code(x, n)
	return Float64((Float64(x + 1.0) ^ Float64(1.0 / n)) - (x ^ Float64(1.0 / n)))
end

MATLAB

function tmp = code(x, n)
	tmp = ((x + 1.0) ^ (1.0 / n)) - (x ^ (1.0 / n));
end

Wolfram

code[x_, n_] := N[(N[Power[N[(x + 1.0), $MachinePrecision], N[(1.0 / n), $MachinePrecision]], $MachinePrecision] - N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]

Alternative 1: 86.5% accurate, 0.3× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \log \left(1 + x\right)\\ \mathbf{if}\;x \leq 5.4:\\ \;\;\;\;-\frac{\left(\left(-\frac{\left(-\frac{-0.16666666666666666 \cdot \left({t\_0}^{3} - {\log x}^{3}\right)}{n}\right) + 0.5 \cdot \left(t\_0 \cdot t\_0 - \log x \cdot \log x\right)}{n}\right) + \left(-t\_0\right)\right) + \log x}{n}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (let* ((t_0 (log (+ 1.0 x))))
   (if (<= x 5.4)
     (-
      (/
       (+
        (+
         (-
          (/
           (+
            (-
             (/
              (* -0.16666666666666666 (- (pow t_0 3.0) (pow (log x) 3.0)))
              n))
            (* 0.5 (- (* t_0 t_0) (* (log x) (log x)))))
           n))
         (- t_0))
        (log x))
       n))
     (/ (/ (exp (- (/ (- (log x)) n))) n) x))))

C

double code(double x, double n) {
	double t_0 = log((1.0 + x));
	double tmp;
	if (x <= 5.4) {
		tmp = -(((-((-((-0.16666666666666666 * (pow(t_0, 3.0) - pow(log(x), 3.0))) / n) + (0.5 * ((t_0 * t_0) - (log(x) * log(x))))) / n) + -t_0) + log(x)) / n);
	} else {
		tmp = (exp(-(-log(x) / n)) / n) / x;
	}
	return tmp;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    real(8) :: t_0
    real(8) :: tmp
    t_0 = log((1.0d0 + x))
    if (x <= 5.4d0) then
        tmp = -(((-((-(((-0.16666666666666666d0) * ((t_0 ** 3.0d0) - (log(x) ** 3.0d0))) / n) + (0.5d0 * ((t_0 * t_0) - (log(x) * log(x))))) / n) + -t_0) + log(x)) / n)
    else
        tmp = (exp(-(-log(x) / n)) / n) / x
    end if
    code = tmp
end function

Java

public static double code(double x, double n) {
	double t_0 = Math.log((1.0 + x));
	double tmp;
	if (x <= 5.4) {
		tmp = -(((-((-((-0.16666666666666666 * (Math.pow(t_0, 3.0) - Math.pow(Math.log(x), 3.0))) / n) + (0.5 * ((t_0 * t_0) - (Math.log(x) * Math.log(x))))) / n) + -t_0) + Math.log(x)) / n);
	} else {
		tmp = (Math.exp(-(-Math.log(x) / n)) / n) / x;
	}
	return tmp;
}

Python

def code(x, n):
	t_0 = math.log((1.0 + x))
	tmp = 0
	if x <= 5.4:
		tmp = -(((-((-((-0.16666666666666666 * (math.pow(t_0, 3.0) - math.pow(math.log(x), 3.0))) / n) + (0.5 * ((t_0 * t_0) - (math.log(x) * math.log(x))))) / n) + -t_0) + math.log(x)) / n)
	else:
		tmp = (math.exp(-(-math.log(x) / n)) / n) / x
	return tmp

Julia

function code(x, n)
	t_0 = log(Float64(1.0 + x))
	tmp = 0.0
	if (x <= 5.4)
		tmp = Float64(-Float64(Float64(Float64(Float64(-Float64(Float64(Float64(-Float64(Float64(-0.16666666666666666 * Float64((t_0 ^ 3.0) - (log(x) ^ 3.0))) / n)) + Float64(0.5 * Float64(Float64(t_0 * t_0) - Float64(log(x) * log(x))))) / n)) + Float64(-t_0)) + log(x)) / n));
	else
		tmp = Float64(Float64(exp(Float64(-Float64(Float64(-log(x)) / n))) / n) / x);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	t_0 = log((1.0 + x));
	tmp = 0.0;
	if (x <= 5.4)
		tmp = -(((-((-((-0.16666666666666666 * ((t_0 ^ 3.0) - (log(x) ^ 3.0))) / n) + (0.5 * ((t_0 * t_0) - (log(x) * log(x))))) / n) + -t_0) + log(x)) / n);
	else
		tmp = (exp(-(-log(x) / n)) / n) / x;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := Block[{t$95$0 = N[Log[N[(1.0 + x), $MachinePrecision]], $MachinePrecision]}, If[LessEqual[x, 5.4], (-N[(N[(N[((-N[(N[((-N[(N[(-0.16666666666666666 * N[(N[Power[t$95$0, 3.0], $MachinePrecision] - N[Power[N[Log[x], $MachinePrecision], 3.0], $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision]) + N[(0.5 * N[(N[(t$95$0 * t$95$0), $MachinePrecision] - N[(N[Log[x], $MachinePrecision] * N[Log[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision]) + (-t$95$0)), $MachinePrecision] + N[Log[x], $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision]), N[(N[(N[Exp[(-N[((-N[Log[x], $MachinePrecision]) / n), $MachinePrecision])], $MachinePrecision] / n), $MachinePrecision] / x), $MachinePrecision]]]

Derivation

1. Split input into 2 regimes

2. if x < 5.4000000000000004

   1. Initial program 42.9%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\left(-1 \cdot \frac{\frac{-1}{6} \cdot {\log \left(1 + x\right)}^{3} - \frac{-1}{6} \cdot {\log x}^{3}}{n} + \frac{1}{2} \cdot {\log \left(1 + x\right)}^{2}\right) - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 77.5%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{\left(-\frac{-0.16666666666666666 \cdot \left({\log \left(1 + x\right)}^{3} - {\log x}^{3}\right)}{n}\right) + 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   if 5.4000000000000004 < x

   1. Initial program 67.2%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 82.4%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n}}{x} \]
   6. Step-by-step derivation

      1. exp-neg N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\log \left(\frac{1}{x}\right)}{n}}}}{n}}{x} \]

      2. neg-log N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\mathsf{neg}\left(\log x\right)}{n}}}}{n}}{x} \]

      3. exp-neg N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      6. lift-log.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      7. lift-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      8. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

      9. lift-exp.f64 98.5

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   7. Applied rewrites 98.5%

      \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 2: 85.3% accurate, 0.6× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq 6 \cdot 10^{-10}:\\ \;\;\;\;-\frac{\left(0.16666666666666666 \cdot \frac{{\log x}^{3}}{n \cdot n} - -0.5 \cdot \frac{\log x \cdot \log x}{n}\right) + \log x}{n}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (if (<= x 6e-10)
   (-
    (/
     (+
      (-
       (* 0.16666666666666666 (/ (pow (log x) 3.0) (* n n)))
       (* -0.5 (/ (* (log x) (log x)) n)))
      (log x))
     n))
   (/ (/ (exp (- (/ (- (log x)) n))) n) x)))

C

double code(double x, double n) {
	double tmp;
	if (x <= 6e-10) {
		tmp = -((((0.16666666666666666 * (pow(log(x), 3.0) / (n * n))) - (-0.5 * ((log(x) * log(x)) / n))) + log(x)) / n);
	} else {
		tmp = (exp(-(-log(x) / n)) / n) / x;
	}
	return tmp;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    real(8) :: tmp
    if (x <= 6d-10) then
        tmp = -((((0.16666666666666666d0 * ((log(x) ** 3.0d0) / (n * n))) - ((-0.5d0) * ((log(x) * log(x)) / n))) + log(x)) / n)
    else
        tmp = (exp(-(-log(x) / n)) / n) / x
    end if
    code = tmp
end function

Java

public static double code(double x, double n) {
	double tmp;
	if (x <= 6e-10) {
		tmp = -((((0.16666666666666666 * (Math.pow(Math.log(x), 3.0) / (n * n))) - (-0.5 * ((Math.log(x) * Math.log(x)) / n))) + Math.log(x)) / n);
	} else {
		tmp = (Math.exp(-(-Math.log(x) / n)) / n) / x;
	}
	return tmp;
}

Python

def code(x, n):
	tmp = 0
	if x <= 6e-10:
		tmp = -((((0.16666666666666666 * (math.pow(math.log(x), 3.0) / (n * n))) - (-0.5 * ((math.log(x) * math.log(x)) / n))) + math.log(x)) / n)
	else:
		tmp = (math.exp(-(-math.log(x) / n)) / n) / x
	return tmp

Julia

function code(x, n)
	tmp = 0.0
	if (x <= 6e-10)
		tmp = Float64(-Float64(Float64(Float64(Float64(0.16666666666666666 * Float64((log(x) ^ 3.0) / Float64(n * n))) - Float64(-0.5 * Float64(Float64(log(x) * log(x)) / n))) + log(x)) / n));
	else
		tmp = Float64(Float64(exp(Float64(-Float64(Float64(-log(x)) / n))) / n) / x);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	tmp = 0.0;
	if (x <= 6e-10)
		tmp = -((((0.16666666666666666 * ((log(x) ^ 3.0) / (n * n))) - (-0.5 * ((log(x) * log(x)) / n))) + log(x)) / n);
	else
		tmp = (exp(-(-log(x) / n)) / n) / x;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := If[LessEqual[x, 6e-10], (-N[(N[(N[(N[(0.16666666666666666 * N[(N[Power[N[Log[x], $MachinePrecision], 3.0], $MachinePrecision] / N[(n * n), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - N[(-0.5 * N[(N[(N[Log[x], $MachinePrecision] * N[Log[x], $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] + N[Log[x], $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision]), N[(N[(N[Exp[(-N[((-N[Log[x], $MachinePrecision]) / n), $MachinePrecision])], $MachinePrecision] / n), $MachinePrecision] / x), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if x < 6e-10

   1. Initial program 42.6%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\left(-1 \cdot \frac{\frac{-1}{6} \cdot {\log \left(1 + x\right)}^{3} - \frac{-1}{6} \cdot {\log x}^{3}}{n} + \frac{1}{2} \cdot {\log \left(1 + x\right)}^{2}\right) - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 77.4%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{\left(-\frac{-0.16666666666666666 \cdot \left({\log \left(1 + x\right)}^{3} - {\log x}^{3}\right)}{n}\right) + 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   5. Taylor expanded in x around 0

      \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{{n}^{2}} - \frac{-1}{2} \cdot \frac{{\log x}^{2}}{n}\right) + \log x}{n} \]
   6. Step-by-step derivation

      1. lower--.f64 N/A

         \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{{n}^{2}} - \frac{-1}{2} \cdot \frac{{\log x}^{2}}{n}\right) + \log x}{n} \]

      2. lower-*.f64 N/A

         \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{{n}^{2}} - \frac{-1}{2} \cdot \frac{{\log x}^{2}}{n}\right) + \log x}{n} \]

      3. lower-/.f64 N/A

         \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{{n}^{2}} - \frac{-1}{2} \cdot \frac{{\log x}^{2}}{n}\right) + \log x}{n} \]

      4. lift-pow.f64 N/A

         \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{{n}^{2}} - \frac{-1}{2} \cdot \frac{{\log x}^{2}}{n}\right) + \log x}{n} \]

      5. lift-log.f64 N/A

         \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{{n}^{2}} - \frac{-1}{2} \cdot \frac{{\log x}^{2}}{n}\right) + \log x}{n} \]

      6. pow2 N/A

         \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{n \cdot n} - \frac{-1}{2} \cdot \frac{{\log x}^{2}}{n}\right) + \log x}{n} \]

      7. lift-*.f64 N/A

         \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{n \cdot n} - \frac{-1}{2} \cdot \frac{{\log x}^{2}}{n}\right) + \log x}{n} \]

      8. lower-*.f64 N/A

         \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{n \cdot n} - \frac{-1}{2} \cdot \frac{{\log x}^{2}}{n}\right) + \log x}{n} \]

      9. lower-/.f64 N/A

         \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{n \cdot n} - \frac{-1}{2} \cdot \frac{{\log x}^{2}}{n}\right) + \log x}{n} \]

      10. pow2 N/A

          \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{n \cdot n} - \frac{-1}{2} \cdot \frac{\log x \cdot \log x}{n}\right) + \log x}{n} \]

      11. lift-log.f64 N/A

          \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{n \cdot n} - \frac{-1}{2} \cdot \frac{\log x \cdot \log x}{n}\right) + \log x}{n} \]

      12. lift-log.f64 N/A

          \[\leadsto -\frac{\left(\frac{1}{6} \cdot \frac{{\log x}^{3}}{n \cdot n} - \frac{-1}{2} \cdot \frac{\log x \cdot \log x}{n}\right) + \log x}{n} \]

      13. lift-*.f64 77.0

          \[\leadsto -\frac{\left(0.16666666666666666 \cdot \frac{{\log x}^{3}}{n \cdot n} - -0.5 \cdot \frac{\log x \cdot \log x}{n}\right) + \log x}{n} \]

   7. Applied rewrites 77.0%

      \[\leadsto -\frac{\left(0.16666666666666666 \cdot \frac{{\log x}^{3}}{n \cdot n} - -0.5 \cdot \frac{\log x \cdot \log x}{n}\right) + \log x}{n} \]

   if 6e-10 < x

   1. Initial program 66.6%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 79.0%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n}}{x} \]
   6. Step-by-step derivation

      1. exp-neg N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\log \left(\frac{1}{x}\right)}{n}}}}{n}}{x} \]

      2. neg-log N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\mathsf{neg}\left(\log x\right)}{n}}}}{n}}{x} \]

      3. exp-neg N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      6. lift-log.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      7. lift-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      8. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

      9. lift-exp.f64 95.5

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   7. Applied rewrites 95.5%

      \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 3: 82.3% accurate, 0.7× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{1}{n} \leq -5 \cdot 10^{-8}:\\ \;\;\;\;\frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x}\\ \mathbf{elif}\;\frac{1}{n} \leq 4 \cdot 10^{-18}:\\ \;\;\;\;-\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n}\\ \mathbf{elif}\;\frac{1}{n} \leq 4 \cdot 10^{+121}:\\ \;\;\;\;{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)}\\ \mathbf{else}:\\ \;\;\;\;\frac{1 + \mathsf{fma}\left(0.5, \frac{\log x \cdot \log x}{n \cdot n}, \frac{\log x}{n}\right)}{n \cdot x}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (if (<= (/ 1.0 n) -5e-8)
   (/ (/ (exp (- (/ (- (log x)) n))) n) x)
   (if (<= (/ 1.0 n) 4e-18)
     (- (/ (/ (* n (log (/ x (+ 1.0 x)))) n) n))
     (if (<= (/ 1.0 n) 4e+121)
       (- (pow (+ x 1.0) (/ 1.0 n)) (pow x (/ 1.0 n)))
       (/
        (+ 1.0 (fma 0.5 (/ (* (log x) (log x)) (* n n)) (/ (log x) n)))
        (* n x))))))

C

double code(double x, double n) {
	double tmp;
	if ((1.0 / n) <= -5e-8) {
		tmp = (exp(-(-log(x) / n)) / n) / x;
	} else if ((1.0 / n) <= 4e-18) {
		tmp = -(((n * log((x / (1.0 + x)))) / n) / n);
	} else if ((1.0 / n) <= 4e+121) {
		tmp = pow((x + 1.0), (1.0 / n)) - pow(x, (1.0 / n));
	} else {
		tmp = (1.0 + fma(0.5, ((log(x) * log(x)) / (n * n)), (log(x) / n))) / (n * x);
	}
	return tmp;
}

Julia

function code(x, n)
	tmp = 0.0
	if (Float64(1.0 / n) <= -5e-8)
		tmp = Float64(Float64(exp(Float64(-Float64(Float64(-log(x)) / n))) / n) / x);
	elseif (Float64(1.0 / n) <= 4e-18)
		tmp = Float64(-Float64(Float64(Float64(n * log(Float64(x / Float64(1.0 + x)))) / n) / n));
	elseif (Float64(1.0 / n) <= 4e+121)
		tmp = Float64((Float64(x + 1.0) ^ Float64(1.0 / n)) - (x ^ Float64(1.0 / n)));
	else
		tmp = Float64(Float64(1.0 + fma(0.5, Float64(Float64(log(x) * log(x)) / Float64(n * n)), Float64(log(x) / n))) / Float64(n * x));
	end
	return tmp
end

Wolfram

code[x_, n_] := If[LessEqual[N[(1.0 / n), $MachinePrecision], -5e-8], N[(N[(N[Exp[(-N[((-N[Log[x], $MachinePrecision]) / n), $MachinePrecision])], $MachinePrecision] / n), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[N[(1.0 / n), $MachinePrecision], 4e-18], (-N[(N[(N[(n * N[Log[N[(x / N[(1.0 + x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision] / n), $MachinePrecision]), If[LessEqual[N[(1.0 / n), $MachinePrecision], 4e+121], N[(N[Power[N[(x + 1.0), $MachinePrecision], N[(1.0 / n), $MachinePrecision]], $MachinePrecision] - N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]), $MachinePrecision], N[(N[(1.0 + N[(0.5 * N[(N[(N[Log[x], $MachinePrecision] * N[Log[x], $MachinePrecision]), $MachinePrecision] / N[(n * n), $MachinePrecision]), $MachinePrecision] + N[(N[Log[x], $MachinePrecision] / n), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / N[(n * x), $MachinePrecision]), $MachinePrecision]]]]

Derivation

1. Split input into 4 regimes

2. if (/.f64 #s(literal 1 binary64) n) < -4.9999999999999998e-8

   1. Initial program 99.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 25.9%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n}}{x} \]
   6. Step-by-step derivation

      1. exp-neg N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\log \left(\frac{1}{x}\right)}{n}}}}{n}}{x} \]

      2. neg-log N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\mathsf{neg}\left(\log x\right)}{n}}}}{n}}{x} \]

      3. exp-neg N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      6. lift-log.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      7. lift-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      8. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

      9. lift-exp.f64 99.0

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   7. Applied rewrites 99.0%

      \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   if -4.9999999999999998e-8 < (/.f64 #s(literal 1 binary64) n) < 4.0000000000000003e-18

   1. Initial program 29.2%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\frac{1}{2} \cdot {\log \left(1 + x\right)}^{2} - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 77.5%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   5. Taylor expanded in n around 0

      \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]

   7. Applied rewrites 77.4%

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right) - 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}}{n} \]

   8. Taylor expanded in n around inf

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]
   9. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      2. lift-+.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      3. lift-log.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      4. lift-*.f64 77.2

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   10. Applied rewrites 77.2%

       \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   if 4.0000000000000003e-18 < (/.f64 #s(literal 1 binary64) n) < 4.00000000000000015e121

   1. Initial program 70.0%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   if 4.00000000000000015e121 < (/.f64 #s(literal 1 binary64) n)

   1. Initial program 39.8%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n \cdot x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{\color{blue}{n \cdot x}} \]

      2. lower-exp.f64 N/A

         \[\leadsto \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{\color{blue}{n} \cdot x} \]

      3. mul-1-neg N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n \cdot x} \]

      4. log-rec N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n \cdot x} \]

      5. mul-1-neg N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{-1 \cdot \log x}{n}\right)}}{n \cdot x} \]

      6. lower-neg.f64 N/A

         \[\leadsto \frac{e^{-\frac{-1 \cdot \log x}{n}}}{n \cdot x} \]

      7. lower-/.f64 N/A

         \[\leadsto \frac{e^{-\frac{-1 \cdot \log x}{n}}}{n \cdot x} \]

      8. mul-1-neg N/A

         \[\leadsto \frac{e^{-\frac{\mathsf{neg}\left(\log x\right)}{n}}}{n \cdot x} \]

      9. lower-neg.f64 N/A

         \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot x} \]

      10. lower-log.f64 N/A

          \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot x} \]

      11. lower-*.f64 0.6

          \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot \color{blue}{x}} \]

   4. Applied rewrites 0.6%

      \[\leadsto \color{blue}{\frac{e^{-\frac{-\log x}{n}}}{n \cdot x}} \]

   5. Taylor expanded in n around inf

      \[\leadsto \frac{1 + \left(\frac{1}{2} \cdot \frac{{\log x}^{2}}{{n}^{2}} + \frac{\log x}{n}\right)}{\color{blue}{n} \cdot x} \]
   6. Step-by-step derivation

      1. lower-+.f64 N/A

         \[\leadsto \frac{1 + \left(\frac{1}{2} \cdot \frac{{\log x}^{2}}{{n}^{2}} + \frac{\log x}{n}\right)}{n \cdot x} \]

      2. pow2 N/A

         \[\leadsto \frac{1 + \left(\frac{1}{2} \cdot \frac{\log x \cdot \log x}{{n}^{2}} + \frac{\log x}{n}\right)}{n \cdot x} \]

      3. pow2 N/A

         \[\leadsto \frac{1 + \left(\frac{1}{2} \cdot \frac{\log x \cdot \log x}{n \cdot n} + \frac{\log x}{n}\right)}{n \cdot x} \]

      4. lower-fma.f64 N/A

         \[\leadsto \frac{1 + \mathsf{fma}\left(\frac{1}{2}, \frac{\log x \cdot \log x}{n \cdot n}, \frac{\log x}{n}\right)}{n \cdot x} \]

      5. lift-log.f64 N/A

         \[\leadsto \frac{1 + \mathsf{fma}\left(\frac{1}{2}, \frac{\log x \cdot \log x}{n \cdot n}, \frac{\log x}{n}\right)}{n \cdot x} \]

      6. lift-log.f64 N/A

         \[\leadsto \frac{1 + \mathsf{fma}\left(\frac{1}{2}, \frac{\log x \cdot \log x}{n \cdot n}, \frac{\log x}{n}\right)}{n \cdot x} \]

      7. lift-*.f64 N/A

         \[\leadsto \frac{1 + \mathsf{fma}\left(\frac{1}{2}, \frac{\log x \cdot \log x}{n \cdot n}, \frac{\log x}{n}\right)}{n \cdot x} \]

      8. lift-/.f64 N/A

         \[\leadsto \frac{1 + \mathsf{fma}\left(\frac{1}{2}, \frac{\log x \cdot \log x}{n \cdot n}, \frac{\log x}{n}\right)}{n \cdot x} \]

      9. lift-*.f64 N/A

         \[\leadsto \frac{1 + \mathsf{fma}\left(\frac{1}{2}, \frac{\log x \cdot \log x}{n \cdot n}, \frac{\log x}{n}\right)}{n \cdot x} \]

      10. lift-log.f64 N/A

          \[\leadsto \frac{1 + \mathsf{fma}\left(\frac{1}{2}, \frac{\log x \cdot \log x}{n \cdot n}, \frac{\log x}{n}\right)}{n \cdot x} \]

      11. lift-/.f64 65.6

          \[\leadsto \frac{1 + \mathsf{fma}\left(0.5, \frac{\log x \cdot \log x}{n \cdot n}, \frac{\log x}{n}\right)}{n \cdot x} \]

   7. Applied rewrites 65.6%

      \[\leadsto \frac{1 + \mathsf{fma}\left(0.5, \frac{\log x \cdot \log x}{n \cdot n}, \frac{\log x}{n}\right)}{\color{blue}{n} \cdot x} \]
3. Recombined 4 regimes into one program.
4. Add Preprocessing

Alternative 4: 82.3% accurate, 0.7× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{1}{n} \leq -5 \cdot 10^{-8}:\\ \;\;\;\;\frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x}\\ \mathbf{elif}\;\frac{1}{n} \leq 4 \cdot 10^{-18}:\\ \;\;\;\;-\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n}\\ \mathbf{elif}\;\frac{1}{n} \leq 5 \cdot 10^{+144}:\\ \;\;\;\;{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)}\\ \mathbf{else}:\\ \;\;\;\;\frac{\mathsf{fma}\left(1, 0.5 \cdot \frac{1}{n \cdot n} - 0.5 \cdot \frac{1}{n}, \frac{x \cdot 1}{n}\right)}{x \cdot x}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (if (<= (/ 1.0 n) -5e-8)
   (/ (/ (exp (- (/ (- (log x)) n))) n) x)
   (if (<= (/ 1.0 n) 4e-18)
     (- (/ (/ (* n (log (/ x (+ 1.0 x)))) n) n))
     (if (<= (/ 1.0 n) 5e+144)
       (- (pow (+ x 1.0) (/ 1.0 n)) (pow x (/ 1.0 n)))
       (/
        (fma 1.0 (- (* 0.5 (/ 1.0 (* n n))) (* 0.5 (/ 1.0 n))) (/ (* x 1.0) n))
        (* x x))))))

C

double code(double x, double n) {
	double tmp;
	if ((1.0 / n) <= -5e-8) {
		tmp = (exp(-(-log(x) / n)) / n) / x;
	} else if ((1.0 / n) <= 4e-18) {
		tmp = -(((n * log((x / (1.0 + x)))) / n) / n);
	} else if ((1.0 / n) <= 5e+144) {
		tmp = pow((x + 1.0), (1.0 / n)) - pow(x, (1.0 / n));
	} else {
		tmp = fma(1.0, ((0.5 * (1.0 / (n * n))) - (0.5 * (1.0 / n))), ((x * 1.0) / n)) / (x * x);
	}
	return tmp;
}

Julia

function code(x, n)
	tmp = 0.0
	if (Float64(1.0 / n) <= -5e-8)
		tmp = Float64(Float64(exp(Float64(-Float64(Float64(-log(x)) / n))) / n) / x);
	elseif (Float64(1.0 / n) <= 4e-18)
		tmp = Float64(-Float64(Float64(Float64(n * log(Float64(x / Float64(1.0 + x)))) / n) / n));
	elseif (Float64(1.0 / n) <= 5e+144)
		tmp = Float64((Float64(x + 1.0) ^ Float64(1.0 / n)) - (x ^ Float64(1.0 / n)));
	else
		tmp = Float64(fma(1.0, Float64(Float64(0.5 * Float64(1.0 / Float64(n * n))) - Float64(0.5 * Float64(1.0 / n))), Float64(Float64(x * 1.0) / n)) / Float64(x * x));
	end
	return tmp
end

Wolfram

code[x_, n_] := If[LessEqual[N[(1.0 / n), $MachinePrecision], -5e-8], N[(N[(N[Exp[(-N[((-N[Log[x], $MachinePrecision]) / n), $MachinePrecision])], $MachinePrecision] / n), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[N[(1.0 / n), $MachinePrecision], 4e-18], (-N[(N[(N[(n * N[Log[N[(x / N[(1.0 + x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision] / n), $MachinePrecision]), If[LessEqual[N[(1.0 / n), $MachinePrecision], 5e+144], N[(N[Power[N[(x + 1.0), $MachinePrecision], N[(1.0 / n), $MachinePrecision]], $MachinePrecision] - N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]), $MachinePrecision], N[(N[(1.0 * N[(N[(0.5 * N[(1.0 / N[(n * n), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - N[(0.5 * N[(1.0 / n), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] + N[(N[(x * 1.0), $MachinePrecision] / n), $MachinePrecision]), $MachinePrecision] / N[(x * x), $MachinePrecision]), $MachinePrecision]]]]

Derivation

1. Split input into 4 regimes

2. if (/.f64 #s(literal 1 binary64) n) < -4.9999999999999998e-8

   1. Initial program 99.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 25.9%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n}}{x} \]
   6. Step-by-step derivation

      1. exp-neg N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\log \left(\frac{1}{x}\right)}{n}}}}{n}}{x} \]

      2. neg-log N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\mathsf{neg}\left(\log x\right)}{n}}}}{n}}{x} \]

      3. exp-neg N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      6. lift-log.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      7. lift-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      8. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

      9. lift-exp.f64 99.0

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   7. Applied rewrites 99.0%

      \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   if -4.9999999999999998e-8 < (/.f64 #s(literal 1 binary64) n) < 4.0000000000000003e-18

   1. Initial program 29.2%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\frac{1}{2} \cdot {\log \left(1 + x\right)}^{2} - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 77.5%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   5. Taylor expanded in n around 0

      \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]

   7. Applied rewrites 77.4%

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right) - 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}}{n} \]

   8. Taylor expanded in n around inf

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]
   9. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      2. lift-+.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      3. lift-log.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      4. lift-*.f64 77.2

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   10. Applied rewrites 77.2%

       \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   if 4.0000000000000003e-18 < (/.f64 #s(literal 1 binary64) n) < 4.9999999999999999e144

   1. Initial program 69.4%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   if 4.9999999999999999e144 < (/.f64 #s(literal 1 binary64) n)

   1. Initial program 35.9%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 0.0%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around 0

      \[\leadsto \frac{e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{x \cdot e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)}}{n}}{\color{blue}{{x}^{2}}} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{x \cdot e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)}}{n}}{{x}^{\color{blue}{2}}} \]

   7. Applied rewrites 0.1%

      \[\leadsto \frac{\mathsf{fma}\left(e^{--1 \cdot \frac{\log x}{n}}, 0.5 \cdot \frac{1}{n \cdot n} - 0.5 \cdot \frac{1}{n}, \frac{x \cdot e^{--1 \cdot \frac{\log x}{n}}}{n}\right)}{\color{blue}{x \cdot x}} \]

   8. Taylor expanded in n around inf

      \[\leadsto \frac{\mathsf{fma}\left(1, \frac{1}{2} \cdot \frac{1}{n \cdot n} - \frac{1}{2} \cdot \frac{1}{n}, \frac{x \cdot e^{--1 \cdot \frac{\log x}{n}}}{n}\right)}{x \cdot x} \]
   9. Step-by-step derivation

   10. Applied rewrites 69.7%

       \[\leadsto \frac{\mathsf{fma}\left(1, 0.5 \cdot \frac{1}{n \cdot n} - 0.5 \cdot \frac{1}{n}, \frac{x \cdot e^{--1 \cdot \frac{\log x}{n}}}{n}\right)}{x \cdot x} \]

   11. Taylor expanded in n around inf

       \[\leadsto \frac{\mathsf{fma}\left(1, \frac{1}{2} \cdot \frac{1}{n \cdot n} - \frac{1}{2} \cdot \frac{1}{n}, \frac{x \cdot 1}{n}\right)}{x \cdot x} \]
   12. Step-by-step derivation

   13. Applied rewrites 69.7%

       \[\leadsto \frac{\mathsf{fma}\left(1, 0.5 \cdot \frac{1}{n \cdot n} - 0.5 \cdot \frac{1}{n}, \frac{x \cdot 1}{n}\right)}{x \cdot x} \]
3. Recombined 4 regimes into one program.
4. Add Preprocessing

Alternative 5: 82.2% accurate, 0.8× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{1}{n} \leq -5 \cdot 10^{-8}:\\ \;\;\;\;\frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x}\\ \mathbf{elif}\;\frac{1}{n} \leq 5 \cdot 10^{-13}:\\ \;\;\;\;-\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n}\\ \mathbf{elif}\;\frac{1}{n} \leq 4 \cdot 10^{+121}:\\ \;\;\;\;\left(\frac{x}{n} + 1\right) - {x}^{\left(\frac{1}{n}\right)}\\ \mathbf{else}:\\ \;\;\;\;\frac{\mathsf{fma}\left(1, 0.5 \cdot \frac{1}{n \cdot n} - 0.5 \cdot \frac{1}{n}, \frac{x \cdot 1}{n}\right)}{x \cdot x}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (if (<= (/ 1.0 n) -5e-8)
   (/ (/ (exp (- (/ (- (log x)) n))) n) x)
   (if (<= (/ 1.0 n) 5e-13)
     (- (/ (/ (* n (log (/ x (+ 1.0 x)))) n) n))
     (if (<= (/ 1.0 n) 4e+121)
       (- (+ (/ x n) 1.0) (pow x (/ 1.0 n)))
       (/
        (fma 1.0 (- (* 0.5 (/ 1.0 (* n n))) (* 0.5 (/ 1.0 n))) (/ (* x 1.0) n))
        (* x x))))))

C

double code(double x, double n) {
	double tmp;
	if ((1.0 / n) <= -5e-8) {
		tmp = (exp(-(-log(x) / n)) / n) / x;
	} else if ((1.0 / n) <= 5e-13) {
		tmp = -(((n * log((x / (1.0 + x)))) / n) / n);
	} else if ((1.0 / n) <= 4e+121) {
		tmp = ((x / n) + 1.0) - pow(x, (1.0 / n));
	} else {
		tmp = fma(1.0, ((0.5 * (1.0 / (n * n))) - (0.5 * (1.0 / n))), ((x * 1.0) / n)) / (x * x);
	}
	return tmp;
}

Julia

function code(x, n)
	tmp = 0.0
	if (Float64(1.0 / n) <= -5e-8)
		tmp = Float64(Float64(exp(Float64(-Float64(Float64(-log(x)) / n))) / n) / x);
	elseif (Float64(1.0 / n) <= 5e-13)
		tmp = Float64(-Float64(Float64(Float64(n * log(Float64(x / Float64(1.0 + x)))) / n) / n));
	elseif (Float64(1.0 / n) <= 4e+121)
		tmp = Float64(Float64(Float64(x / n) + 1.0) - (x ^ Float64(1.0 / n)));
	else
		tmp = Float64(fma(1.0, Float64(Float64(0.5 * Float64(1.0 / Float64(n * n))) - Float64(0.5 * Float64(1.0 / n))), Float64(Float64(x * 1.0) / n)) / Float64(x * x));
	end
	return tmp
end

Wolfram

code[x_, n_] := If[LessEqual[N[(1.0 / n), $MachinePrecision], -5e-8], N[(N[(N[Exp[(-N[((-N[Log[x], $MachinePrecision]) / n), $MachinePrecision])], $MachinePrecision] / n), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[N[(1.0 / n), $MachinePrecision], 5e-13], (-N[(N[(N[(n * N[Log[N[(x / N[(1.0 + x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision] / n), $MachinePrecision]), If[LessEqual[N[(1.0 / n), $MachinePrecision], 4e+121], N[(N[(N[(x / n), $MachinePrecision] + 1.0), $MachinePrecision] - N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]), $MachinePrecision], N[(N[(1.0 * N[(N[(0.5 * N[(1.0 / N[(n * n), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - N[(0.5 * N[(1.0 / n), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] + N[(N[(x * 1.0), $MachinePrecision] / n), $MachinePrecision]), $MachinePrecision] / N[(x * x), $MachinePrecision]), $MachinePrecision]]]]

Derivation

1. Split input into 4 regimes

2. if (/.f64 #s(literal 1 binary64) n) < -4.9999999999999998e-8

   1. Initial program 99.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 25.9%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n}}{x} \]
   6. Step-by-step derivation

      1. exp-neg N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\log \left(\frac{1}{x}\right)}{n}}}}{n}}{x} \]

      2. neg-log N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\mathsf{neg}\left(\log x\right)}{n}}}}{n}}{x} \]

      3. exp-neg N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      6. lift-log.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      7. lift-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      8. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

      9. lift-exp.f64 99.0

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   7. Applied rewrites 99.0%

      \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   if -4.9999999999999998e-8 < (/.f64 #s(literal 1 binary64) n) < 4.9999999999999999e-13

   1. Initial program 29.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\frac{1}{2} \cdot {\log \left(1 + x\right)}^{2} - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 77.2%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   5. Taylor expanded in n around 0

      \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]

   7. Applied rewrites 77.1%

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right) - 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}}{n} \]

   8. Taylor expanded in n around inf

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]
   9. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      2. lift-+.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      3. lift-log.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      4. lift-*.f64 76.9

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   10. Applied rewrites 76.9%

       \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   if 4.9999999999999999e-13 < (/.f64 #s(literal 1 binary64) n) < 4.00000000000000015e121

   1. Initial program 73.7%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around 0

      \[\leadsto \color{blue}{\left(1 + \frac{x}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]
   3. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto \left(\frac{x}{n} + \color{blue}{1}\right) - {x}^{\left(\frac{1}{n}\right)} \]

      2. lower-+.f64 N/A

         \[\leadsto \left(\frac{x}{n} + \color{blue}{1}\right) - {x}^{\left(\frac{1}{n}\right)} \]

      3. lower-/.f64 71.0

         \[\leadsto \left(\frac{x}{n} + 1\right) - {x}^{\left(\frac{1}{n}\right)} \]

   4. Applied rewrites 71.0%

      \[\leadsto \color{blue}{\left(\frac{x}{n} + 1\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   if 4.00000000000000015e121 < (/.f64 #s(literal 1 binary64) n)

   1. Initial program 39.8%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 0.0%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around 0

      \[\leadsto \frac{e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{x \cdot e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)}}{n}}{\color{blue}{{x}^{2}}} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{x \cdot e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)}}{n}}{{x}^{\color{blue}{2}}} \]

   7. Applied rewrites 0.2%

      \[\leadsto \frac{\mathsf{fma}\left(e^{--1 \cdot \frac{\log x}{n}}, 0.5 \cdot \frac{1}{n \cdot n} - 0.5 \cdot \frac{1}{n}, \frac{x \cdot e^{--1 \cdot \frac{\log x}{n}}}{n}\right)}{\color{blue}{x \cdot x}} \]

   8. Taylor expanded in n around inf

      \[\leadsto \frac{\mathsf{fma}\left(1, \frac{1}{2} \cdot \frac{1}{n \cdot n} - \frac{1}{2} \cdot \frac{1}{n}, \frac{x \cdot e^{--1 \cdot \frac{\log x}{n}}}{n}\right)}{x \cdot x} \]
   9. Step-by-step derivation

   10. Applied rewrites 65.3%

       \[\leadsto \frac{\mathsf{fma}\left(1, 0.5 \cdot \frac{1}{n \cdot n} - 0.5 \cdot \frac{1}{n}, \frac{x \cdot e^{--1 \cdot \frac{\log x}{n}}}{n}\right)}{x \cdot x} \]

   11. Taylor expanded in n around inf

       \[\leadsto \frac{\mathsf{fma}\left(1, \frac{1}{2} \cdot \frac{1}{n \cdot n} - \frac{1}{2} \cdot \frac{1}{n}, \frac{x \cdot 1}{n}\right)}{x \cdot x} \]
   12. Step-by-step derivation

   13. Applied rewrites 65.3%

       \[\leadsto \frac{\mathsf{fma}\left(1, 0.5 \cdot \frac{1}{n \cdot n} - 0.5 \cdot \frac{1}{n}, \frac{x \cdot 1}{n}\right)}{x \cdot x} \]
3. Recombined 4 regimes into one program.
4. Add Preprocessing

Alternative 6: 81.9% accurate, 0.6× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \log \left(1 + x\right)\\ \mathbf{if}\;\frac{1}{n} \leq -5 \cdot 10^{-8}:\\ \;\;\;\;\frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x}\\ \mathbf{elif}\;\frac{1}{n} \leq 5 \cdot 10^{-13}:\\ \;\;\;\;-\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right) - 0.5 \cdot \left(t\_0 \cdot t\_0 - \log x \cdot \log x\right)}{n}}{n}\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(\mathsf{fma}\left(\frac{0.5}{n \cdot n} - \frac{0.5}{n}, x, \frac{1}{n}\right), x, 1\right) - {x}^{\left(\frac{1}{n}\right)}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (let* ((t_0 (log (+ 1.0 x))))
   (if (<= (/ 1.0 n) -5e-8)
     (/ (/ (exp (- (/ (- (log x)) n))) n) x)
     (if (<= (/ 1.0 n) 5e-13)
       (-
        (/
         (/
          (-
           (* n (log (/ x (+ 1.0 x))))
           (* 0.5 (- (* t_0 t_0) (* (log x) (log x)))))
          n)
         n))
       (-
        (fma (fma (- (/ 0.5 (* n n)) (/ 0.5 n)) x (/ 1.0 n)) x 1.0)
        (pow x (/ 1.0 n)))))))

C

double code(double x, double n) {
	double t_0 = log((1.0 + x));
	double tmp;
	if ((1.0 / n) <= -5e-8) {
		tmp = (exp(-(-log(x) / n)) / n) / x;
	} else if ((1.0 / n) <= 5e-13) {
		tmp = -((((n * log((x / (1.0 + x)))) - (0.5 * ((t_0 * t_0) - (log(x) * log(x))))) / n) / n);
	} else {
		tmp = fma(fma(((0.5 / (n * n)) - (0.5 / n)), x, (1.0 / n)), x, 1.0) - pow(x, (1.0 / n));
	}
	return tmp;
}

Julia

function code(x, n)
	t_0 = log(Float64(1.0 + x))
	tmp = 0.0
	if (Float64(1.0 / n) <= -5e-8)
		tmp = Float64(Float64(exp(Float64(-Float64(Float64(-log(x)) / n))) / n) / x);
	elseif (Float64(1.0 / n) <= 5e-13)
		tmp = Float64(-Float64(Float64(Float64(Float64(n * log(Float64(x / Float64(1.0 + x)))) - Float64(0.5 * Float64(Float64(t_0 * t_0) - Float64(log(x) * log(x))))) / n) / n));
	else
		tmp = Float64(fma(fma(Float64(Float64(0.5 / Float64(n * n)) - Float64(0.5 / n)), x, Float64(1.0 / n)), x, 1.0) - (x ^ Float64(1.0 / n)));
	end
	return tmp
end

Wolfram

code[x_, n_] := Block[{t$95$0 = N[Log[N[(1.0 + x), $MachinePrecision]], $MachinePrecision]}, If[LessEqual[N[(1.0 / n), $MachinePrecision], -5e-8], N[(N[(N[Exp[(-N[((-N[Log[x], $MachinePrecision]) / n), $MachinePrecision])], $MachinePrecision] / n), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[N[(1.0 / n), $MachinePrecision], 5e-13], (-N[(N[(N[(N[(n * N[Log[N[(x / N[(1.0 + x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] - N[(0.5 * N[(N[(t$95$0 * t$95$0), $MachinePrecision] - N[(N[Log[x], $MachinePrecision] * N[Log[x], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision] / n), $MachinePrecision]), N[(N[(N[(N[(N[(0.5 / N[(n * n), $MachinePrecision]), $MachinePrecision] - N[(0.5 / n), $MachinePrecision]), $MachinePrecision] * x + N[(1.0 / n), $MachinePrecision]), $MachinePrecision] * x + 1.0), $MachinePrecision] - N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]]]]

Derivation

1. Split input into 3 regimes

2. if (/.f64 #s(literal 1 binary64) n) < -4.9999999999999998e-8

   1. Initial program 99.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 25.9%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n}}{x} \]
   6. Step-by-step derivation

      1. exp-neg N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\log \left(\frac{1}{x}\right)}{n}}}}{n}}{x} \]

      2. neg-log N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\mathsf{neg}\left(\log x\right)}{n}}}}{n}}{x} \]

      3. exp-neg N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      6. lift-log.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      7. lift-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      8. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

      9. lift-exp.f64 99.0

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   7. Applied rewrites 99.0%

      \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   if -4.9999999999999998e-8 < (/.f64 #s(literal 1 binary64) n) < 4.9999999999999999e-13

   1. Initial program 29.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\frac{1}{2} \cdot {\log \left(1 + x\right)}^{2} - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 77.2%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   5. Taylor expanded in n around 0

      \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]

   7. Applied rewrites 77.1%

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right) - 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}}{n} \]

   if 4.9999999999999999e-13 < (/.f64 #s(literal 1 binary64) n)

   1. Initial program 54.3%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around 0

      \[\leadsto \color{blue}{\left(1 + x \cdot \left(x \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{1}{n}\right)\right)} - {x}^{\left(\frac{1}{n}\right)} \]
   3. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto \left(x \cdot \left(x \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{1}{n}\right) + \color{blue}{1}\right) - {x}^{\left(\frac{1}{n}\right)} \]

      2. *-commutative N/A

         \[\leadsto \left(\left(x \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{1}{n}\right) \cdot x + 1\right) - {x}^{\left(\frac{1}{n}\right)} \]

      3. lower-fma.f64 N/A

         \[\leadsto \mathsf{fma}\left(x \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{1}{n}, \color{blue}{x}, 1\right) - {x}^{\left(\frac{1}{n}\right)} \]

   4. Applied rewrites 70.0%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\mathsf{fma}\left(\frac{0.5}{n \cdot n} - \frac{0.5}{n}, x, \frac{1}{n}\right), x, 1\right)} - {x}^{\left(\frac{1}{n}\right)} \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 7: 81.8% accurate, 0.9× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{1}{n} \leq -5 \cdot 10^{-8}:\\ \;\;\;\;\frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x}\\ \mathbf{elif}\;\frac{1}{n} \leq 5 \cdot 10^{-13}:\\ \;\;\;\;-\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n}\\ \mathbf{elif}\;\frac{1}{n} \leq 4 \cdot 10^{+121}:\\ \;\;\;\;\left(\frac{x}{n} + 1\right) - {x}^{\left(\frac{1}{n}\right)}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{\left(1 + \frac{0.3333333333333333}{x \cdot x}\right) - 0.5 \cdot \frac{1}{x}}{x}}{n}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (if (<= (/ 1.0 n) -5e-8)
   (/ (/ (exp (- (/ (- (log x)) n))) n) x)
   (if (<= (/ 1.0 n) 5e-13)
     (- (/ (/ (* n (log (/ x (+ 1.0 x)))) n) n))
     (if (<= (/ 1.0 n) 4e+121)
       (- (+ (/ x n) 1.0) (pow x (/ 1.0 n)))
       (/
        (/ (- (+ 1.0 (/ 0.3333333333333333 (* x x))) (* 0.5 (/ 1.0 x))) x)
        n)))))

C

double code(double x, double n) {
	double tmp;
	if ((1.0 / n) <= -5e-8) {
		tmp = (exp(-(-log(x) / n)) / n) / x;
	} else if ((1.0 / n) <= 5e-13) {
		tmp = -(((n * log((x / (1.0 + x)))) / n) / n);
	} else if ((1.0 / n) <= 4e+121) {
		tmp = ((x / n) + 1.0) - pow(x, (1.0 / n));
	} else {
		tmp = (((1.0 + (0.3333333333333333 / (x * x))) - (0.5 * (1.0 / x))) / x) / n;
	}
	return tmp;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    real(8) :: tmp
    if ((1.0d0 / n) <= (-5d-8)) then
        tmp = (exp(-(-log(x) / n)) / n) / x
    else if ((1.0d0 / n) <= 5d-13) then
        tmp = -(((n * log((x / (1.0d0 + x)))) / n) / n)
    else if ((1.0d0 / n) <= 4d+121) then
        tmp = ((x / n) + 1.0d0) - (x ** (1.0d0 / n))
    else
        tmp = (((1.0d0 + (0.3333333333333333d0 / (x * x))) - (0.5d0 * (1.0d0 / x))) / x) / n
    end if
    code = tmp
end function

Java

public static double code(double x, double n) {
	double tmp;
	if ((1.0 / n) <= -5e-8) {
		tmp = (Math.exp(-(-Math.log(x) / n)) / n) / x;
	} else if ((1.0 / n) <= 5e-13) {
		tmp = -(((n * Math.log((x / (1.0 + x)))) / n) / n);
	} else if ((1.0 / n) <= 4e+121) {
		tmp = ((x / n) + 1.0) - Math.pow(x, (1.0 / n));
	} else {
		tmp = (((1.0 + (0.3333333333333333 / (x * x))) - (0.5 * (1.0 / x))) / x) / n;
	}
	return tmp;
}

Python

def code(x, n):
	tmp = 0
	if (1.0 / n) <= -5e-8:
		tmp = (math.exp(-(-math.log(x) / n)) / n) / x
	elif (1.0 / n) <= 5e-13:
		tmp = -(((n * math.log((x / (1.0 + x)))) / n) / n)
	elif (1.0 / n) <= 4e+121:
		tmp = ((x / n) + 1.0) - math.pow(x, (1.0 / n))
	else:
		tmp = (((1.0 + (0.3333333333333333 / (x * x))) - (0.5 * (1.0 / x))) / x) / n
	return tmp

Julia

function code(x, n)
	tmp = 0.0
	if (Float64(1.0 / n) <= -5e-8)
		tmp = Float64(Float64(exp(Float64(-Float64(Float64(-log(x)) / n))) / n) / x);
	elseif (Float64(1.0 / n) <= 5e-13)
		tmp = Float64(-Float64(Float64(Float64(n * log(Float64(x / Float64(1.0 + x)))) / n) / n));
	elseif (Float64(1.0 / n) <= 4e+121)
		tmp = Float64(Float64(Float64(x / n) + 1.0) - (x ^ Float64(1.0 / n)));
	else
		tmp = Float64(Float64(Float64(Float64(1.0 + Float64(0.3333333333333333 / Float64(x * x))) - Float64(0.5 * Float64(1.0 / x))) / x) / n);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	tmp = 0.0;
	if ((1.0 / n) <= -5e-8)
		tmp = (exp(-(-log(x) / n)) / n) / x;
	elseif ((1.0 / n) <= 5e-13)
		tmp = -(((n * log((x / (1.0 + x)))) / n) / n);
	elseif ((1.0 / n) <= 4e+121)
		tmp = ((x / n) + 1.0) - (x ^ (1.0 / n));
	else
		tmp = (((1.0 + (0.3333333333333333 / (x * x))) - (0.5 * (1.0 / x))) / x) / n;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := If[LessEqual[N[(1.0 / n), $MachinePrecision], -5e-8], N[(N[(N[Exp[(-N[((-N[Log[x], $MachinePrecision]) / n), $MachinePrecision])], $MachinePrecision] / n), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[N[(1.0 / n), $MachinePrecision], 5e-13], (-N[(N[(N[(n * N[Log[N[(x / N[(1.0 + x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision] / n), $MachinePrecision]), If[LessEqual[N[(1.0 / n), $MachinePrecision], 4e+121], N[(N[(N[(x / n), $MachinePrecision] + 1.0), $MachinePrecision] - N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]), $MachinePrecision], N[(N[(N[(N[(1.0 + N[(0.3333333333333333 / N[(x * x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - N[(0.5 * N[(1.0 / x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / x), $MachinePrecision] / n), $MachinePrecision]]]]

Derivation

1. Split input into 4 regimes

2. if (/.f64 #s(literal 1 binary64) n) < -4.9999999999999998e-8

   1. Initial program 99.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 25.9%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n}}{x} \]
   6. Step-by-step derivation

      1. exp-neg N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\log \left(\frac{1}{x}\right)}{n}}}}{n}}{x} \]

      2. neg-log N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\mathsf{neg}\left(\log x\right)}{n}}}}{n}}{x} \]

      3. exp-neg N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      6. lift-log.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      7. lift-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      8. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

      9. lift-exp.f64 99.0

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   7. Applied rewrites 99.0%

      \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   if -4.9999999999999998e-8 < (/.f64 #s(literal 1 binary64) n) < 4.9999999999999999e-13

   1. Initial program 29.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\frac{1}{2} \cdot {\log \left(1 + x\right)}^{2} - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 77.2%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   5. Taylor expanded in n around 0

      \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]

   7. Applied rewrites 77.1%

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right) - 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}}{n} \]

   8. Taylor expanded in n around inf

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]
   9. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      2. lift-+.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      3. lift-log.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      4. lift-*.f64 76.9

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   10. Applied rewrites 76.9%

       \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   if 4.9999999999999999e-13 < (/.f64 #s(literal 1 binary64) n) < 4.00000000000000015e121

   1. Initial program 73.7%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around 0

      \[\leadsto \color{blue}{\left(1 + \frac{x}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]
   3. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto \left(\frac{x}{n} + \color{blue}{1}\right) - {x}^{\left(\frac{1}{n}\right)} \]

      2. lower-+.f64 N/A

         \[\leadsto \left(\frac{x}{n} + \color{blue}{1}\right) - {x}^{\left(\frac{1}{n}\right)} \]

      3. lower-/.f64 71.0

         \[\leadsto \left(\frac{x}{n} + 1\right) - {x}^{\left(\frac{1}{n}\right)} \]

   4. Applied rewrites 71.0%

      \[\leadsto \color{blue}{\left(\frac{x}{n} + 1\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   if 4.00000000000000015e121 < (/.f64 #s(literal 1 binary64) n)

   1. Initial program 39.8%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 7.0

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 7.0%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      2. lower--.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      3. lower-+.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      5. unpow2 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{x \cdot x}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      6. lower-*.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{x \cdot x}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      7. lower-*.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{x \cdot x}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      8. lower-/.f64 56.6

         \[\leadsto \frac{\frac{\left(1 + \frac{0.3333333333333333}{x \cdot x}\right) - 0.5 \cdot \frac{1}{x}}{x}}{n} \]

   7. Applied rewrites 56.6%

      \[\leadsto \frac{\frac{\left(1 + \frac{0.3333333333333333}{x \cdot x}\right) - 0.5 \cdot \frac{1}{x}}{x}}{n} \]
3. Recombined 4 regimes into one program.
4. Add Preprocessing

Alternative 8: 81.0% accurate, 0.9× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{1}{n} \leq -5 \cdot 10^{-8}:\\ \;\;\;\;\frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x}\\ \mathbf{elif}\;\frac{1}{n} \leq 5 \cdot 10^{-13}:\\ \;\;\;\;-\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n}\\ \mathbf{elif}\;\frac{1}{n} \leq 4 \cdot 10^{+121}:\\ \;\;\;\;1 - {x}^{\left(\frac{1}{n}\right)}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{\left(1 + \frac{0.3333333333333333}{x \cdot x}\right) - 0.5 \cdot \frac{1}{x}}{x}}{n}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (if (<= (/ 1.0 n) -5e-8)
   (/ (/ (exp (- (/ (- (log x)) n))) n) x)
   (if (<= (/ 1.0 n) 5e-13)
     (- (/ (/ (* n (log (/ x (+ 1.0 x)))) n) n))
     (if (<= (/ 1.0 n) 4e+121)
       (- 1.0 (pow x (/ 1.0 n)))
       (/
        (/ (- (+ 1.0 (/ 0.3333333333333333 (* x x))) (* 0.5 (/ 1.0 x))) x)
        n)))))

C

double code(double x, double n) {
	double tmp;
	if ((1.0 / n) <= -5e-8) {
		tmp = (exp(-(-log(x) / n)) / n) / x;
	} else if ((1.0 / n) <= 5e-13) {
		tmp = -(((n * log((x / (1.0 + x)))) / n) / n);
	} else if ((1.0 / n) <= 4e+121) {
		tmp = 1.0 - pow(x, (1.0 / n));
	} else {
		tmp = (((1.0 + (0.3333333333333333 / (x * x))) - (0.5 * (1.0 / x))) / x) / n;
	}
	return tmp;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    real(8) :: tmp
    if ((1.0d0 / n) <= (-5d-8)) then
        tmp = (exp(-(-log(x) / n)) / n) / x
    else if ((1.0d0 / n) <= 5d-13) then
        tmp = -(((n * log((x / (1.0d0 + x)))) / n) / n)
    else if ((1.0d0 / n) <= 4d+121) then
        tmp = 1.0d0 - (x ** (1.0d0 / n))
    else
        tmp = (((1.0d0 + (0.3333333333333333d0 / (x * x))) - (0.5d0 * (1.0d0 / x))) / x) / n
    end if
    code = tmp
end function

Java

public static double code(double x, double n) {
	double tmp;
	if ((1.0 / n) <= -5e-8) {
		tmp = (Math.exp(-(-Math.log(x) / n)) / n) / x;
	} else if ((1.0 / n) <= 5e-13) {
		tmp = -(((n * Math.log((x / (1.0 + x)))) / n) / n);
	} else if ((1.0 / n) <= 4e+121) {
		tmp = 1.0 - Math.pow(x, (1.0 / n));
	} else {
		tmp = (((1.0 + (0.3333333333333333 / (x * x))) - (0.5 * (1.0 / x))) / x) / n;
	}
	return tmp;
}

Python

def code(x, n):
	tmp = 0
	if (1.0 / n) <= -5e-8:
		tmp = (math.exp(-(-math.log(x) / n)) / n) / x
	elif (1.0 / n) <= 5e-13:
		tmp = -(((n * math.log((x / (1.0 + x)))) / n) / n)
	elif (1.0 / n) <= 4e+121:
		tmp = 1.0 - math.pow(x, (1.0 / n))
	else:
		tmp = (((1.0 + (0.3333333333333333 / (x * x))) - (0.5 * (1.0 / x))) / x) / n
	return tmp

Julia

function code(x, n)
	tmp = 0.0
	if (Float64(1.0 / n) <= -5e-8)
		tmp = Float64(Float64(exp(Float64(-Float64(Float64(-log(x)) / n))) / n) / x);
	elseif (Float64(1.0 / n) <= 5e-13)
		tmp = Float64(-Float64(Float64(Float64(n * log(Float64(x / Float64(1.0 + x)))) / n) / n));
	elseif (Float64(1.0 / n) <= 4e+121)
		tmp = Float64(1.0 - (x ^ Float64(1.0 / n)));
	else
		tmp = Float64(Float64(Float64(Float64(1.0 + Float64(0.3333333333333333 / Float64(x * x))) - Float64(0.5 * Float64(1.0 / x))) / x) / n);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	tmp = 0.0;
	if ((1.0 / n) <= -5e-8)
		tmp = (exp(-(-log(x) / n)) / n) / x;
	elseif ((1.0 / n) <= 5e-13)
		tmp = -(((n * log((x / (1.0 + x)))) / n) / n);
	elseif ((1.0 / n) <= 4e+121)
		tmp = 1.0 - (x ^ (1.0 / n));
	else
		tmp = (((1.0 + (0.3333333333333333 / (x * x))) - (0.5 * (1.0 / x))) / x) / n;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := If[LessEqual[N[(1.0 / n), $MachinePrecision], -5e-8], N[(N[(N[Exp[(-N[((-N[Log[x], $MachinePrecision]) / n), $MachinePrecision])], $MachinePrecision] / n), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[N[(1.0 / n), $MachinePrecision], 5e-13], (-N[(N[(N[(n * N[Log[N[(x / N[(1.0 + x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision] / n), $MachinePrecision]), If[LessEqual[N[(1.0 / n), $MachinePrecision], 4e+121], N[(1.0 - N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]), $MachinePrecision], N[(N[(N[(N[(1.0 + N[(0.3333333333333333 / N[(x * x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - N[(0.5 * N[(1.0 / x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / x), $MachinePrecision] / n), $MachinePrecision]]]]

Derivation

1. Split input into 4 regimes

2. if (/.f64 #s(literal 1 binary64) n) < -4.9999999999999998e-8

   1. Initial program 99.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 25.9%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n}}{x} \]
   6. Step-by-step derivation

      1. exp-neg N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\log \left(\frac{1}{x}\right)}{n}}}}{n}}{x} \]

      2. neg-log N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\mathsf{neg}\left(\log x\right)}{n}}}}{n}}{x} \]

      3. exp-neg N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      6. lift-log.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      7. lift-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      8. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

      9. lift-exp.f64 99.0

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   7. Applied rewrites 99.0%

      \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   if -4.9999999999999998e-8 < (/.f64 #s(literal 1 binary64) n) < 4.9999999999999999e-13

   1. Initial program 29.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\frac{1}{2} \cdot {\log \left(1 + x\right)}^{2} - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 77.2%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   5. Taylor expanded in n around 0

      \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]

   7. Applied rewrites 77.1%

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right) - 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}}{n} \]

   8. Taylor expanded in n around inf

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]
   9. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      2. lift-+.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      3. lift-log.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      4. lift-*.f64 76.9

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   10. Applied rewrites 76.9%

       \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   if 4.9999999999999999e-13 < (/.f64 #s(literal 1 binary64) n) < 4.00000000000000015e121

   1. Initial program 73.7%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around 0

      \[\leadsto \color{blue}{1} - {x}^{\left(\frac{1}{n}\right)} \]
   3. Step-by-step derivation

   4. Applied rewrites 69.4%

      \[\leadsto \color{blue}{1} - {x}^{\left(\frac{1}{n}\right)} \]

   if 4.00000000000000015e121 < (/.f64 #s(literal 1 binary64) n)

   1. Initial program 39.8%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 7.0

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 7.0%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      2. lower--.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      3. lower-+.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      5. unpow2 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{x \cdot x}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      6. lower-*.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{x \cdot x}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      7. lower-*.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{x \cdot x}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      8. lower-/.f64 56.6

         \[\leadsto \frac{\frac{\left(1 + \frac{0.3333333333333333}{x \cdot x}\right) - 0.5 \cdot \frac{1}{x}}{x}}{n} \]

   7. Applied rewrites 56.6%

      \[\leadsto \frac{\frac{\left(1 + \frac{0.3333333333333333}{x \cdot x}\right) - 0.5 \cdot \frac{1}{x}}{x}}{n} \]
3. Recombined 4 regimes into one program.
4. Add Preprocessing

Alternative 9: 80.9% accurate, 0.9× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{1}{n} \leq -5 \cdot 10^{-8}:\\ \;\;\;\;\frac{e^{\frac{\log x}{n}}}{n \cdot x}\\ \mathbf{elif}\;\frac{1}{n} \leq 5 \cdot 10^{-13}:\\ \;\;\;\;-\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n}\\ \mathbf{elif}\;\frac{1}{n} \leq 4 \cdot 10^{+121}:\\ \;\;\;\;1 - {x}^{\left(\frac{1}{n}\right)}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{\left(1 + \frac{0.3333333333333333}{x \cdot x}\right) - 0.5 \cdot \frac{1}{x}}{x}}{n}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (if (<= (/ 1.0 n) -5e-8)
   (/ (exp (/ (log x) n)) (* n x))
   (if (<= (/ 1.0 n) 5e-13)
     (- (/ (/ (* n (log (/ x (+ 1.0 x)))) n) n))
     (if (<= (/ 1.0 n) 4e+121)
       (- 1.0 (pow x (/ 1.0 n)))
       (/
        (/ (- (+ 1.0 (/ 0.3333333333333333 (* x x))) (* 0.5 (/ 1.0 x))) x)
        n)))))

C

double code(double x, double n) {
	double tmp;
	if ((1.0 / n) <= -5e-8) {
		tmp = exp((log(x) / n)) / (n * x);
	} else if ((1.0 / n) <= 5e-13) {
		tmp = -(((n * log((x / (1.0 + x)))) / n) / n);
	} else if ((1.0 / n) <= 4e+121) {
		tmp = 1.0 - pow(x, (1.0 / n));
	} else {
		tmp = (((1.0 + (0.3333333333333333 / (x * x))) - (0.5 * (1.0 / x))) / x) / n;
	}
	return tmp;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    real(8) :: tmp
    if ((1.0d0 / n) <= (-5d-8)) then
        tmp = exp((log(x) / n)) / (n * x)
    else if ((1.0d0 / n) <= 5d-13) then
        tmp = -(((n * log((x / (1.0d0 + x)))) / n) / n)
    else if ((1.0d0 / n) <= 4d+121) then
        tmp = 1.0d0 - (x ** (1.0d0 / n))
    else
        tmp = (((1.0d0 + (0.3333333333333333d0 / (x * x))) - (0.5d0 * (1.0d0 / x))) / x) / n
    end if
    code = tmp
end function

Java

public static double code(double x, double n) {
	double tmp;
	if ((1.0 / n) <= -5e-8) {
		tmp = Math.exp((Math.log(x) / n)) / (n * x);
	} else if ((1.0 / n) <= 5e-13) {
		tmp = -(((n * Math.log((x / (1.0 + x)))) / n) / n);
	} else if ((1.0 / n) <= 4e+121) {
		tmp = 1.0 - Math.pow(x, (1.0 / n));
	} else {
		tmp = (((1.0 + (0.3333333333333333 / (x * x))) - (0.5 * (1.0 / x))) / x) / n;
	}
	return tmp;
}

Python

def code(x, n):
	tmp = 0
	if (1.0 / n) <= -5e-8:
		tmp = math.exp((math.log(x) / n)) / (n * x)
	elif (1.0 / n) <= 5e-13:
		tmp = -(((n * math.log((x / (1.0 + x)))) / n) / n)
	elif (1.0 / n) <= 4e+121:
		tmp = 1.0 - math.pow(x, (1.0 / n))
	else:
		tmp = (((1.0 + (0.3333333333333333 / (x * x))) - (0.5 * (1.0 / x))) / x) / n
	return tmp

Julia

function code(x, n)
	tmp = 0.0
	if (Float64(1.0 / n) <= -5e-8)
		tmp = Float64(exp(Float64(log(x) / n)) / Float64(n * x));
	elseif (Float64(1.0 / n) <= 5e-13)
		tmp = Float64(-Float64(Float64(Float64(n * log(Float64(x / Float64(1.0 + x)))) / n) / n));
	elseif (Float64(1.0 / n) <= 4e+121)
		tmp = Float64(1.0 - (x ^ Float64(1.0 / n)));
	else
		tmp = Float64(Float64(Float64(Float64(1.0 + Float64(0.3333333333333333 / Float64(x * x))) - Float64(0.5 * Float64(1.0 / x))) / x) / n);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	tmp = 0.0;
	if ((1.0 / n) <= -5e-8)
		tmp = exp((log(x) / n)) / (n * x);
	elseif ((1.0 / n) <= 5e-13)
		tmp = -(((n * log((x / (1.0 + x)))) / n) / n);
	elseif ((1.0 / n) <= 4e+121)
		tmp = 1.0 - (x ^ (1.0 / n));
	else
		tmp = (((1.0 + (0.3333333333333333 / (x * x))) - (0.5 * (1.0 / x))) / x) / n;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := If[LessEqual[N[(1.0 / n), $MachinePrecision], -5e-8], N[(N[Exp[N[(N[Log[x], $MachinePrecision] / n), $MachinePrecision]], $MachinePrecision] / N[(n * x), $MachinePrecision]), $MachinePrecision], If[LessEqual[N[(1.0 / n), $MachinePrecision], 5e-13], (-N[(N[(N[(n * N[Log[N[(x / N[(1.0 + x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision] / n), $MachinePrecision]), If[LessEqual[N[(1.0 / n), $MachinePrecision], 4e+121], N[(1.0 - N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]), $MachinePrecision], N[(N[(N[(N[(1.0 + N[(0.3333333333333333 / N[(x * x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - N[(0.5 * N[(1.0 / x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / x), $MachinePrecision] / n), $MachinePrecision]]]]

Derivation

1. Split input into 4 regimes

2. if (/.f64 #s(literal 1 binary64) n) < -4.9999999999999998e-8

   1. Initial program 99.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n \cdot x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{\color{blue}{n \cdot x}} \]

      2. lower-exp.f64 N/A

         \[\leadsto \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{\color{blue}{n} \cdot x} \]

      3. mul-1-neg N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n \cdot x} \]

      4. log-rec N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n \cdot x} \]

      5. mul-1-neg N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{-1 \cdot \log x}{n}\right)}}{n \cdot x} \]

      6. lower-neg.f64 N/A

         \[\leadsto \frac{e^{-\frac{-1 \cdot \log x}{n}}}{n \cdot x} \]

      7. lower-/.f64 N/A

         \[\leadsto \frac{e^{-\frac{-1 \cdot \log x}{n}}}{n \cdot x} \]

      8. mul-1-neg N/A

         \[\leadsto \frac{e^{-\frac{\mathsf{neg}\left(\log x\right)}{n}}}{n \cdot x} \]

      9. lower-neg.f64 N/A

         \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot x} \]

      10. lower-log.f64 N/A

          \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot x} \]

      11. lower-*.f64 99.0

          \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot \color{blue}{x}} \]

   4. Applied rewrites 99.0%

      \[\leadsto \color{blue}{\frac{e^{-\frac{-\log x}{n}}}{n \cdot x}} \]

   5. Taylor expanded in x around 0

      \[\leadsto \frac{e^{\frac{\log x}{n}}}{n \cdot x} \]
   6. Step-by-step derivation

      1. lift-log.f64 N/A

         \[\leadsto \frac{e^{\frac{\log x}{n}}}{n \cdot x} \]

      2. lift-/.f64 99.0

         \[\leadsto \frac{e^{\frac{\log x}{n}}}{n \cdot x} \]

   7. Applied rewrites 99.0%

      \[\leadsto \frac{e^{\frac{\log x}{n}}}{n \cdot x} \]

   if -4.9999999999999998e-8 < (/.f64 #s(literal 1 binary64) n) < 4.9999999999999999e-13

   1. Initial program 29.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\frac{1}{2} \cdot {\log \left(1 + x\right)}^{2} - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 77.2%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   5. Taylor expanded in n around 0

      \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]

   7. Applied rewrites 77.1%

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right) - 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}}{n} \]

   8. Taylor expanded in n around inf

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]
   9. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      2. lift-+.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      3. lift-log.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      4. lift-*.f64 76.9

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   10. Applied rewrites 76.9%

       \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   if 4.9999999999999999e-13 < (/.f64 #s(literal 1 binary64) n) < 4.00000000000000015e121

   1. Initial program 73.7%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around 0

      \[\leadsto \color{blue}{1} - {x}^{\left(\frac{1}{n}\right)} \]
   3. Step-by-step derivation

   4. Applied rewrites 69.4%

      \[\leadsto \color{blue}{1} - {x}^{\left(\frac{1}{n}\right)} \]

   if 4.00000000000000015e121 < (/.f64 #s(literal 1 binary64) n)

   1. Initial program 39.8%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 7.0

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 7.0%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      2. lower--.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      3. lower-+.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      5. unpow2 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{x \cdot x}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      6. lower-*.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{x \cdot x}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      7. lower-*.f64 N/A

         \[\leadsto \frac{\frac{\left(1 + \frac{\frac{1}{3}}{x \cdot x}\right) - \frac{1}{2} \cdot \frac{1}{x}}{x}}{n} \]

      8. lower-/.f64 56.6

         \[\leadsto \frac{\frac{\left(1 + \frac{0.3333333333333333}{x \cdot x}\right) - 0.5 \cdot \frac{1}{x}}{x}}{n} \]

   7. Applied rewrites 56.6%

      \[\leadsto \frac{\frac{\left(1 + \frac{0.3333333333333333}{x \cdot x}\right) - 0.5 \cdot \frac{1}{x}}{x}}{n} \]
3. Recombined 4 regimes into one program.
4. Add Preprocessing

Alternative 10: 80.9% accurate, 0.7× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{1}{n} \leq -5 \cdot 10^{-8}:\\ \;\;\;\;\frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x}\\ \mathbf{elif}\;\frac{1}{n} \leq 5 \cdot 10^{-13}:\\ \;\;\;\;-\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n}\\ \mathbf{else}:\\ \;\;\;\;\mathsf{fma}\left(\mathsf{fma}\left(\frac{0.5}{n \cdot n} - \frac{0.5}{n}, x, \frac{1}{n}\right), x, 1\right) - {x}^{\left(\frac{1}{n}\right)}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (if (<= (/ 1.0 n) -5e-8)
   (/ (/ (exp (- (/ (- (log x)) n))) n) x)
   (if (<= (/ 1.0 n) 5e-13)
     (- (/ (/ (* n (log (/ x (+ 1.0 x)))) n) n))
     (-
      (fma (fma (- (/ 0.5 (* n n)) (/ 0.5 n)) x (/ 1.0 n)) x 1.0)
      (pow x (/ 1.0 n))))))

C

double code(double x, double n) {
	double tmp;
	if ((1.0 / n) <= -5e-8) {
		tmp = (exp(-(-log(x) / n)) / n) / x;
	} else if ((1.0 / n) <= 5e-13) {
		tmp = -(((n * log((x / (1.0 + x)))) / n) / n);
	} else {
		tmp = fma(fma(((0.5 / (n * n)) - (0.5 / n)), x, (1.0 / n)), x, 1.0) - pow(x, (1.0 / n));
	}
	return tmp;
}

Julia

function code(x, n)
	tmp = 0.0
	if (Float64(1.0 / n) <= -5e-8)
		tmp = Float64(Float64(exp(Float64(-Float64(Float64(-log(x)) / n))) / n) / x);
	elseif (Float64(1.0 / n) <= 5e-13)
		tmp = Float64(-Float64(Float64(Float64(n * log(Float64(x / Float64(1.0 + x)))) / n) / n));
	else
		tmp = Float64(fma(fma(Float64(Float64(0.5 / Float64(n * n)) - Float64(0.5 / n)), x, Float64(1.0 / n)), x, 1.0) - (x ^ Float64(1.0 / n)));
	end
	return tmp
end

Wolfram

code[x_, n_] := If[LessEqual[N[(1.0 / n), $MachinePrecision], -5e-8], N[(N[(N[Exp[(-N[((-N[Log[x], $MachinePrecision]) / n), $MachinePrecision])], $MachinePrecision] / n), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[N[(1.0 / n), $MachinePrecision], 5e-13], (-N[(N[(N[(n * N[Log[N[(x / N[(1.0 + x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision] / n), $MachinePrecision]), N[(N[(N[(N[(N[(0.5 / N[(n * n), $MachinePrecision]), $MachinePrecision] - N[(0.5 / n), $MachinePrecision]), $MachinePrecision] * x + N[(1.0 / n), $MachinePrecision]), $MachinePrecision] * x + 1.0), $MachinePrecision] - N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if (/.f64 #s(literal 1 binary64) n) < -4.9999999999999998e-8

   1. Initial program 99.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 25.9%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n}}{x} \]
   6. Step-by-step derivation

      1. exp-neg N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\log \left(\frac{1}{x}\right)}{n}}}}{n}}{x} \]

      2. neg-log N/A

         \[\leadsto \frac{\frac{\frac{1}{e^{\frac{\mathsf{neg}\left(\log x\right)}{n}}}}{n}}{x} \]

      3. exp-neg N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n}}{x} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      6. lift-log.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      7. lift-/.f64 N/A

         \[\leadsto \frac{\frac{e^{\mathsf{neg}\left(\frac{-\log x}{n}\right)}}{n}}{x} \]

      8. lift-neg.f64 N/A

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

      9. lift-exp.f64 99.0

         \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   7. Applied rewrites 99.0%

      \[\leadsto \frac{\frac{e^{-\frac{-\log x}{n}}}{n}}{x} \]

   if -4.9999999999999998e-8 < (/.f64 #s(literal 1 binary64) n) < 4.9999999999999999e-13

   1. Initial program 29.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\frac{1}{2} \cdot {\log \left(1 + x\right)}^{2} - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 77.2%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   5. Taylor expanded in n around 0

      \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]

   7. Applied rewrites 77.1%

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right) - 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}}{n} \]

   8. Taylor expanded in n around inf

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]
   9. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      2. lift-+.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      3. lift-log.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      4. lift-*.f64 76.9

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   10. Applied rewrites 76.9%

       \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   if 4.9999999999999999e-13 < (/.f64 #s(literal 1 binary64) n)

   1. Initial program 54.3%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around 0

      \[\leadsto \color{blue}{\left(1 + x \cdot \left(x \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{1}{n}\right)\right)} - {x}^{\left(\frac{1}{n}\right)} \]
   3. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto \left(x \cdot \left(x \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{1}{n}\right) + \color{blue}{1}\right) - {x}^{\left(\frac{1}{n}\right)} \]

      2. *-commutative N/A

         \[\leadsto \left(\left(x \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{1}{n}\right) \cdot x + 1\right) - {x}^{\left(\frac{1}{n}\right)} \]

      3. lower-fma.f64 N/A

         \[\leadsto \mathsf{fma}\left(x \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{1}{n}, \color{blue}{x}, 1\right) - {x}^{\left(\frac{1}{n}\right)} \]

   4. Applied rewrites 70.0%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\mathsf{fma}\left(\frac{0.5}{n \cdot n} - \frac{0.5}{n}, x, \frac{1}{n}\right), x, 1\right)} - {x}^{\left(\frac{1}{n}\right)} \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 11: 78.4% accurate, 0.4× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := {x}^{\left(\frac{1}{n}\right)}\\ t_1 := {\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - t\_0\\ t_2 := 1 - t\_0\\ \mathbf{if}\;t\_1 \leq -5 \cdot 10^{-8}:\\ \;\;\;\;t\_2\\ \mathbf{elif}\;t\_1 \leq 10^{-15}:\\ \;\;\;\;-\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n}\\ \mathbf{else}:\\ \;\;\;\;t\_2\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (let* ((t_0 (pow x (/ 1.0 n)))
        (t_1 (- (pow (+ x 1.0) (/ 1.0 n)) t_0))
        (t_2 (- 1.0 t_0)))
   (if (<= t_1 -5e-8)
     t_2
     (if (<= t_1 1e-15) (- (/ (/ (* n (log (/ x (+ 1.0 x)))) n) n)) t_2))))

C

double code(double x, double n) {
	double t_0 = pow(x, (1.0 / n));
	double t_1 = pow((x + 1.0), (1.0 / n)) - t_0;
	double t_2 = 1.0 - t_0;
	double tmp;
	if (t_1 <= -5e-8) {
		tmp = t_2;
	} else if (t_1 <= 1e-15) {
		tmp = -(((n * log((x / (1.0 + x)))) / n) / n);
	} else {
		tmp = t_2;
	}
	return tmp;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    real(8) :: t_0
    real(8) :: t_1
    real(8) :: t_2
    real(8) :: tmp
    t_0 = x ** (1.0d0 / n)
    t_1 = ((x + 1.0d0) ** (1.0d0 / n)) - t_0
    t_2 = 1.0d0 - t_0
    if (t_1 <= (-5d-8)) then
        tmp = t_2
    else if (t_1 <= 1d-15) then
        tmp = -(((n * log((x / (1.0d0 + x)))) / n) / n)
    else
        tmp = t_2
    end if
    code = tmp
end function

Java

public static double code(double x, double n) {
	double t_0 = Math.pow(x, (1.0 / n));
	double t_1 = Math.pow((x + 1.0), (1.0 / n)) - t_0;
	double t_2 = 1.0 - t_0;
	double tmp;
	if (t_1 <= -5e-8) {
		tmp = t_2;
	} else if (t_1 <= 1e-15) {
		tmp = -(((n * Math.log((x / (1.0 + x)))) / n) / n);
	} else {
		tmp = t_2;
	}
	return tmp;
}

Python

def code(x, n):
	t_0 = math.pow(x, (1.0 / n))
	t_1 = math.pow((x + 1.0), (1.0 / n)) - t_0
	t_2 = 1.0 - t_0
	tmp = 0
	if t_1 <= -5e-8:
		tmp = t_2
	elif t_1 <= 1e-15:
		tmp = -(((n * math.log((x / (1.0 + x)))) / n) / n)
	else:
		tmp = t_2
	return tmp

Julia

function code(x, n)
	t_0 = x ^ Float64(1.0 / n)
	t_1 = Float64((Float64(x + 1.0) ^ Float64(1.0 / n)) - t_0)
	t_2 = Float64(1.0 - t_0)
	tmp = 0.0
	if (t_1 <= -5e-8)
		tmp = t_2;
	elseif (t_1 <= 1e-15)
		tmp = Float64(-Float64(Float64(Float64(n * log(Float64(x / Float64(1.0 + x)))) / n) / n));
	else
		tmp = t_2;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	t_0 = x ^ (1.0 / n);
	t_1 = ((x + 1.0) ^ (1.0 / n)) - t_0;
	t_2 = 1.0 - t_0;
	tmp = 0.0;
	if (t_1 <= -5e-8)
		tmp = t_2;
	elseif (t_1 <= 1e-15)
		tmp = -(((n * log((x / (1.0 + x)))) / n) / n);
	else
		tmp = t_2;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := Block[{t$95$0 = N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]}, Block[{t$95$1 = N[(N[Power[N[(x + 1.0), $MachinePrecision], N[(1.0 / n), $MachinePrecision]], $MachinePrecision] - t$95$0), $MachinePrecision]}, Block[{t$95$2 = N[(1.0 - t$95$0), $MachinePrecision]}, If[LessEqual[t$95$1, -5e-8], t$95$2, If[LessEqual[t$95$1, 1e-15], (-N[(N[(N[(n * N[Log[N[(x / N[(1.0 + x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] / n), $MachinePrecision] / n), $MachinePrecision]), t$95$2]]]]]

Derivation

1. Split input into 2 regimes

2. if (-.f64 (pow.f64 (+.f64 x #s(literal 1 binary64)) (/.f64 #s(literal 1 binary64) n)) (pow.f64 x (/.f64 #s(literal 1 binary64) n))) < -4.9999999999999998e-8 or 1.0000000000000001e-15 < (-.f64 (pow.f64 (+.f64 x #s(literal 1 binary64)) (/.f64 #s(literal 1 binary64) n)) (pow.f64 x (/.f64 #s(literal 1 binary64) n)))

   1. Initial program 77.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around 0

      \[\leadsto \color{blue}{1} - {x}^{\left(\frac{1}{n}\right)} \]
   3. Step-by-step derivation

   4. Applied rewrites 74.1%

      \[\leadsto \color{blue}{1} - {x}^{\left(\frac{1}{n}\right)} \]

   if -4.9999999999999998e-8 < (-.f64 (pow.f64 (+.f64 x #s(literal 1 binary64)) (/.f64 #s(literal 1 binary64) n)) (pow.f64 x (/.f64 #s(literal 1 binary64) n))) < 1.0000000000000001e-15

   1. Initial program 43.3%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\frac{1}{2} \cdot {\log \left(1 + x\right)}^{2} - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 80.3%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   5. Taylor expanded in n around 0

      \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \left(\log x - \log \left(1 + x\right)\right) - \frac{1}{2} \cdot \left({\log \left(1 + x\right)}^{2} - {\log x}^{2}\right)}{n}}{n} \]

   7. Applied rewrites 80.1%

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right) - 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}}{n} \]

   8. Taylor expanded in n around inf

      \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]
   9. Step-by-step derivation

      1. lift-/.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      2. lift-+.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      3. lift-log.f64 N/A

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

      4. lift-*.f64 80.0

         \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]

   10. Applied rewrites 80.0%

       \[\leadsto -\frac{\frac{n \cdot \log \left(\frac{x}{1 + x}\right)}{n}}{n} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 12: 78.2% accurate, 0.4× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := {x}^{\left(\frac{1}{n}\right)}\\ t_1 := {\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - t\_0\\ t_2 := 1 - t\_0\\ \mathbf{if}\;t\_1 \leq -5 \cdot 10^{-8}:\\ \;\;\;\;t\_2\\ \mathbf{elif}\;t\_1 \leq 10^{-15}:\\ \;\;\;\;-\frac{\log \left(\frac{x}{1 + x}\right)}{n}\\ \mathbf{else}:\\ \;\;\;\;t\_2\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (let* ((t_0 (pow x (/ 1.0 n)))
        (t_1 (- (pow (+ x 1.0) (/ 1.0 n)) t_0))
        (t_2 (- 1.0 t_0)))
   (if (<= t_1 -5e-8)
     t_2
     (if (<= t_1 1e-15) (- (/ (log (/ x (+ 1.0 x))) n)) t_2))))

C

double code(double x, double n) {
	double t_0 = pow(x, (1.0 / n));
	double t_1 = pow((x + 1.0), (1.0 / n)) - t_0;
	double t_2 = 1.0 - t_0;
	double tmp;
	if (t_1 <= -5e-8) {
		tmp = t_2;
	} else if (t_1 <= 1e-15) {
		tmp = -(log((x / (1.0 + x))) / n);
	} else {
		tmp = t_2;
	}
	return tmp;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    real(8) :: t_0
    real(8) :: t_1
    real(8) :: t_2
    real(8) :: tmp
    t_0 = x ** (1.0d0 / n)
    t_1 = ((x + 1.0d0) ** (1.0d0 / n)) - t_0
    t_2 = 1.0d0 - t_0
    if (t_1 <= (-5d-8)) then
        tmp = t_2
    else if (t_1 <= 1d-15) then
        tmp = -(log((x / (1.0d0 + x))) / n)
    else
        tmp = t_2
    end if
    code = tmp
end function

Java

public static double code(double x, double n) {
	double t_0 = Math.pow(x, (1.0 / n));
	double t_1 = Math.pow((x + 1.0), (1.0 / n)) - t_0;
	double t_2 = 1.0 - t_0;
	double tmp;
	if (t_1 <= -5e-8) {
		tmp = t_2;
	} else if (t_1 <= 1e-15) {
		tmp = -(Math.log((x / (1.0 + x))) / n);
	} else {
		tmp = t_2;
	}
	return tmp;
}

Python

def code(x, n):
	t_0 = math.pow(x, (1.0 / n))
	t_1 = math.pow((x + 1.0), (1.0 / n)) - t_0
	t_2 = 1.0 - t_0
	tmp = 0
	if t_1 <= -5e-8:
		tmp = t_2
	elif t_1 <= 1e-15:
		tmp = -(math.log((x / (1.0 + x))) / n)
	else:
		tmp = t_2
	return tmp

Julia

function code(x, n)
	t_0 = x ^ Float64(1.0 / n)
	t_1 = Float64((Float64(x + 1.0) ^ Float64(1.0 / n)) - t_0)
	t_2 = Float64(1.0 - t_0)
	tmp = 0.0
	if (t_1 <= -5e-8)
		tmp = t_2;
	elseif (t_1 <= 1e-15)
		tmp = Float64(-Float64(log(Float64(x / Float64(1.0 + x))) / n));
	else
		tmp = t_2;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	t_0 = x ^ (1.0 / n);
	t_1 = ((x + 1.0) ^ (1.0 / n)) - t_0;
	t_2 = 1.0 - t_0;
	tmp = 0.0;
	if (t_1 <= -5e-8)
		tmp = t_2;
	elseif (t_1 <= 1e-15)
		tmp = -(log((x / (1.0 + x))) / n);
	else
		tmp = t_2;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := Block[{t$95$0 = N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]}, Block[{t$95$1 = N[(N[Power[N[(x + 1.0), $MachinePrecision], N[(1.0 / n), $MachinePrecision]], $MachinePrecision] - t$95$0), $MachinePrecision]}, Block[{t$95$2 = N[(1.0 - t$95$0), $MachinePrecision]}, If[LessEqual[t$95$1, -5e-8], t$95$2, If[LessEqual[t$95$1, 1e-15], (-N[(N[Log[N[(x / N[(1.0 + x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] / n), $MachinePrecision]), t$95$2]]]]]

Derivation

1. Split input into 2 regimes

2. if (-.f64 (pow.f64 (+.f64 x #s(literal 1 binary64)) (/.f64 #s(literal 1 binary64) n)) (pow.f64 x (/.f64 #s(literal 1 binary64) n))) < -4.9999999999999998e-8 or 1.0000000000000001e-15 < (-.f64 (pow.f64 (+.f64 x #s(literal 1 binary64)) (/.f64 #s(literal 1 binary64) n)) (pow.f64 x (/.f64 #s(literal 1 binary64) n)))

   1. Initial program 77.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around 0

      \[\leadsto \color{blue}{1} - {x}^{\left(\frac{1}{n}\right)} \]
   3. Step-by-step derivation

   4. Applied rewrites 74.1%

      \[\leadsto \color{blue}{1} - {x}^{\left(\frac{1}{n}\right)} \]

   if -4.9999999999999998e-8 < (-.f64 (pow.f64 (+.f64 x #s(literal 1 binary64)) (/.f64 #s(literal 1 binary64) n)) (pow.f64 x (/.f64 #s(literal 1 binary64) n))) < 1.0000000000000001e-15

   1. Initial program 43.3%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\left(-1 \cdot \frac{\frac{-1}{6} \cdot {\log \left(1 + x\right)}^{3} - \frac{-1}{6} \cdot {\log x}^{3}}{n} + \frac{1}{2} \cdot {\log \left(1 + x\right)}^{2}\right) - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 80.3%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{\left(-\frac{-0.16666666666666666 \cdot \left({\log \left(1 + x\right)}^{3} - {\log x}^{3}\right)}{n}\right) + 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   5. Taylor expanded in n around inf

      \[\leadsto -\frac{\log x - \log \left(1 + x\right)}{n} \]
   6. Step-by-step derivation

      1. diff-log N/A

         \[\leadsto -\frac{\log \left(\frac{x}{1 + x}\right)}{n} \]

      2. lower-log.f64 N/A

         \[\leadsto -\frac{\log \left(\frac{x}{1 + x}\right)}{n} \]

      3. lower-/.f64 N/A

         \[\leadsto -\frac{\log \left(\frac{x}{1 + x}\right)}{n} \]

      4. lift-+.f64 80.3

         \[\leadsto -\frac{\log \left(\frac{x}{1 + x}\right)}{n} \]

   7. Applied rewrites 80.3%

      \[\leadsto -\frac{\log \left(\frac{x}{1 + x}\right)}{n} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 13: 71.3% accurate, 0.4× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := {\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)}\\ \mathbf{if}\;t\_0 \leq -\infty:\\ \;\;\;\;\frac{\log x}{\left(n \cdot n\right) \cdot x}\\ \mathbf{elif}\;t\_0 \leq 10^{-15}:\\ \;\;\;\;-\frac{\log \left(\frac{x}{1 + x}\right)}{n}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{1}{n}}{x}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (let* ((t_0 (- (pow (+ x 1.0) (/ 1.0 n)) (pow x (/ 1.0 n)))))
   (if (<= t_0 (- INFINITY))
     (/ (log x) (* (* n n) x))
     (if (<= t_0 1e-15) (- (/ (log (/ x (+ 1.0 x))) n)) (/ (/ 1.0 n) x)))))

C

double code(double x, double n) {
	double t_0 = pow((x + 1.0), (1.0 / n)) - pow(x, (1.0 / n));
	double tmp;
	if (t_0 <= -((double) INFINITY)) {
		tmp = log(x) / ((n * n) * x);
	} else if (t_0 <= 1e-15) {
		tmp = -(log((x / (1.0 + x))) / n);
	} else {
		tmp = (1.0 / n) / x;
	}
	return tmp;
}

Java

public static double code(double x, double n) {
	double t_0 = Math.pow((x + 1.0), (1.0 / n)) - Math.pow(x, (1.0 / n));
	double tmp;
	if (t_0 <= -Double.POSITIVE_INFINITY) {
		tmp = Math.log(x) / ((n * n) * x);
	} else if (t_0 <= 1e-15) {
		tmp = -(Math.log((x / (1.0 + x))) / n);
	} else {
		tmp = (1.0 / n) / x;
	}
	return tmp;
}

Python

def code(x, n):
	t_0 = math.pow((x + 1.0), (1.0 / n)) - math.pow(x, (1.0 / n))
	tmp = 0
	if t_0 <= -math.inf:
		tmp = math.log(x) / ((n * n) * x)
	elif t_0 <= 1e-15:
		tmp = -(math.log((x / (1.0 + x))) / n)
	else:
		tmp = (1.0 / n) / x
	return tmp

Julia

function code(x, n)
	t_0 = Float64((Float64(x + 1.0) ^ Float64(1.0 / n)) - (x ^ Float64(1.0 / n)))
	tmp = 0.0
	if (t_0 <= Float64(-Inf))
		tmp = Float64(log(x) / Float64(Float64(n * n) * x));
	elseif (t_0 <= 1e-15)
		tmp = Float64(-Float64(log(Float64(x / Float64(1.0 + x))) / n));
	else
		tmp = Float64(Float64(1.0 / n) / x);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	t_0 = ((x + 1.0) ^ (1.0 / n)) - (x ^ (1.0 / n));
	tmp = 0.0;
	if (t_0 <= -Inf)
		tmp = log(x) / ((n * n) * x);
	elseif (t_0 <= 1e-15)
		tmp = -(log((x / (1.0 + x))) / n);
	else
		tmp = (1.0 / n) / x;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := Block[{t$95$0 = N[(N[Power[N[(x + 1.0), $MachinePrecision], N[(1.0 / n), $MachinePrecision]], $MachinePrecision] - N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]}, If[LessEqual[t$95$0, (-Infinity)], N[(N[Log[x], $MachinePrecision] / N[(N[(n * n), $MachinePrecision] * x), $MachinePrecision]), $MachinePrecision], If[LessEqual[t$95$0, 1e-15], (-N[(N[Log[N[(x / N[(1.0 + x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] / n), $MachinePrecision]), N[(N[(1.0 / n), $MachinePrecision] / x), $MachinePrecision]]]]

Derivation

1. Split input into 3 regimes

2. if (-.f64 (pow.f64 (+.f64 x #s(literal 1 binary64)) (/.f64 #s(literal 1 binary64) n)) (pow.f64 x (/.f64 #s(literal 1 binary64) n))) < -inf.0

   1. Initial program 100.0%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n \cdot x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{\color{blue}{n \cdot x}} \]

      2. lower-exp.f64 N/A

         \[\leadsto \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{\color{blue}{n} \cdot x} \]

      3. mul-1-neg N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n \cdot x} \]

      4. log-rec N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n \cdot x} \]

      5. mul-1-neg N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{-1 \cdot \log x}{n}\right)}}{n \cdot x} \]

      6. lower-neg.f64 N/A

         \[\leadsto \frac{e^{-\frac{-1 \cdot \log x}{n}}}{n \cdot x} \]

      7. lower-/.f64 N/A

         \[\leadsto \frac{e^{-\frac{-1 \cdot \log x}{n}}}{n \cdot x} \]

      8. mul-1-neg N/A

         \[\leadsto \frac{e^{-\frac{\mathsf{neg}\left(\log x\right)}{n}}}{n \cdot x} \]

      9. lower-neg.f64 N/A

         \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot x} \]

      10. lower-log.f64 N/A

          \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot x} \]

      11. lower-*.f64 100.0

          \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot \color{blue}{x}} \]

   4. Applied rewrites 100.0%

      \[\leadsto \color{blue}{\frac{e^{-\frac{-\log x}{n}}}{n \cdot x}} \]

   5. Taylor expanded in n around inf

      \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{\color{blue}{n}} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{n} \]

      2. lower-+.f64 N/A

         \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{n} \]

      3. lower-/.f64 N/A

         \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{n} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{n} \]

      5. lift-log.f64 N/A

         \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{n} \]

      6. lift-*.f64 77.1

         \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{n} \]

   7. Applied rewrites 77.1%

      \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{\color{blue}{n}} \]

   8. Taylor expanded in n around 0

      \[\leadsto \frac{\log x}{{n}^{2} \cdot \color{blue}{x}} \]
   9. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log x}{{n}^{2} \cdot x} \]

      2. lift-log.f64 N/A

         \[\leadsto \frac{\log x}{{n}^{2} \cdot x} \]

      3. lower-*.f64 N/A

         \[\leadsto \frac{\log x}{{n}^{2} \cdot x} \]

      4. pow2 N/A

         \[\leadsto \frac{\log x}{\left(n \cdot n\right) \cdot x} \]

      5. lift-*.f64 77.1

         \[\leadsto \frac{\log x}{\left(n \cdot n\right) \cdot x} \]

   10. Applied rewrites 77.1%

       \[\leadsto \frac{\log x}{\left(n \cdot n\right) \cdot \color{blue}{x}} \]

   if -inf.0 < (-.f64 (pow.f64 (+.f64 x #s(literal 1 binary64)) (/.f64 #s(literal 1 binary64) n)) (pow.f64 x (/.f64 #s(literal 1 binary64) n))) < 1.0000000000000001e-15

   1. Initial program 43.5%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around -inf

      \[\leadsto \color{blue}{-1 \cdot \frac{\left(-1 \cdot \log \left(1 + x\right) + -1 \cdot \frac{\left(-1 \cdot \frac{\frac{-1}{6} \cdot {\log \left(1 + x\right)}^{3} - \frac{-1}{6} \cdot {\log x}^{3}}{n} + \frac{1}{2} \cdot {\log \left(1 + x\right)}^{2}\right) - \frac{1}{2} \cdot {\log x}^{2}}{n}\right) - -1 \cdot \log x}{n}} \]

   4. Applied rewrites 80.2%

      \[\leadsto \color{blue}{-\frac{\left(\left(-\frac{\left(-\frac{-0.16666666666666666 \cdot \left({\log \left(1 + x\right)}^{3} - {\log x}^{3}\right)}{n}\right) + 0.5 \cdot \left(\log \left(1 + x\right) \cdot \log \left(1 + x\right) - \log x \cdot \log x\right)}{n}\right) + \left(-\log \left(1 + x\right)\right)\right) + \log x}{n}} \]

   5. Taylor expanded in n around inf

      \[\leadsto -\frac{\log x - \log \left(1 + x\right)}{n} \]
   6. Step-by-step derivation

      1. diff-log N/A

         \[\leadsto -\frac{\log \left(\frac{x}{1 + x}\right)}{n} \]

      2. lower-log.f64 N/A

         \[\leadsto -\frac{\log \left(\frac{x}{1 + x}\right)}{n} \]

      3. lower-/.f64 N/A

         \[\leadsto -\frac{\log \left(\frac{x}{1 + x}\right)}{n} \]

      4. lift-+.f64 80.0

         \[\leadsto -\frac{\log \left(\frac{x}{1 + x}\right)}{n} \]

   7. Applied rewrites 80.0%

      \[\leadsto -\frac{\log \left(\frac{x}{1 + x}\right)}{n} \]

   if 1.0000000000000001e-15 < (-.f64 (pow.f64 (+.f64 x #s(literal 1 binary64)) (/.f64 #s(literal 1 binary64) n)) (pow.f64 x (/.f64 #s(literal 1 binary64) n)))

   1. Initial program 56.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 9.2

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 9.2%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{\color{blue}{x}} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

      2. lower--.f64 N/A

         \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

      3. lift-/.f64 N/A

         \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

      4. lower-*.f64 N/A

         \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

      6. lift-*.f64 0.5

         \[\leadsto \frac{\frac{1}{n} - 0.5 \cdot \frac{1}{n \cdot x}}{x} \]

   7. Applied rewrites 0.5%

      \[\leadsto \frac{\frac{1}{n} - 0.5 \cdot \frac{1}{n \cdot x}}{\color{blue}{x}} \]

   8. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{1}{n}}{x} \]
   9. Step-by-step derivation

      1. lift-/.f64 26.2

         \[\leadsto \frac{\frac{1}{n}}{x} \]

   10. Applied rewrites 26.2%

       \[\leadsto \frac{\frac{1}{n}}{x} \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 14: 71.3% accurate, 0.4× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := {\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)}\\ \mathbf{if}\;t\_0 \leq -\infty:\\ \;\;\;\;\frac{\log x}{\left(n \cdot n\right) \cdot x}\\ \mathbf{elif}\;t\_0 \leq 10^{-15}:\\ \;\;\;\;\frac{\log \left(\frac{1 + x}{x}\right)}{n}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{1}{n}}{x}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (let* ((t_0 (- (pow (+ x 1.0) (/ 1.0 n)) (pow x (/ 1.0 n)))))
   (if (<= t_0 (- INFINITY))
     (/ (log x) (* (* n n) x))
     (if (<= t_0 1e-15) (/ (log (/ (+ 1.0 x) x)) n) (/ (/ 1.0 n) x)))))

C

double code(double x, double n) {
	double t_0 = pow((x + 1.0), (1.0 / n)) - pow(x, (1.0 / n));
	double tmp;
	if (t_0 <= -((double) INFINITY)) {
		tmp = log(x) / ((n * n) * x);
	} else if (t_0 <= 1e-15) {
		tmp = log(((1.0 + x) / x)) / n;
	} else {
		tmp = (1.0 / n) / x;
	}
	return tmp;
}

Java

public static double code(double x, double n) {
	double t_0 = Math.pow((x + 1.0), (1.0 / n)) - Math.pow(x, (1.0 / n));
	double tmp;
	if (t_0 <= -Double.POSITIVE_INFINITY) {
		tmp = Math.log(x) / ((n * n) * x);
	} else if (t_0 <= 1e-15) {
		tmp = Math.log(((1.0 + x) / x)) / n;
	} else {
		tmp = (1.0 / n) / x;
	}
	return tmp;
}

Python

def code(x, n):
	t_0 = math.pow((x + 1.0), (1.0 / n)) - math.pow(x, (1.0 / n))
	tmp = 0
	if t_0 <= -math.inf:
		tmp = math.log(x) / ((n * n) * x)
	elif t_0 <= 1e-15:
		tmp = math.log(((1.0 + x) / x)) / n
	else:
		tmp = (1.0 / n) / x
	return tmp

Julia

function code(x, n)
	t_0 = Float64((Float64(x + 1.0) ^ Float64(1.0 / n)) - (x ^ Float64(1.0 / n)))
	tmp = 0.0
	if (t_0 <= Float64(-Inf))
		tmp = Float64(log(x) / Float64(Float64(n * n) * x));
	elseif (t_0 <= 1e-15)
		tmp = Float64(log(Float64(Float64(1.0 + x) / x)) / n);
	else
		tmp = Float64(Float64(1.0 / n) / x);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	t_0 = ((x + 1.0) ^ (1.0 / n)) - (x ^ (1.0 / n));
	tmp = 0.0;
	if (t_0 <= -Inf)
		tmp = log(x) / ((n * n) * x);
	elseif (t_0 <= 1e-15)
		tmp = log(((1.0 + x) / x)) / n;
	else
		tmp = (1.0 / n) / x;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := Block[{t$95$0 = N[(N[Power[N[(x + 1.0), $MachinePrecision], N[(1.0 / n), $MachinePrecision]], $MachinePrecision] - N[Power[x, N[(1.0 / n), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]}, If[LessEqual[t$95$0, (-Infinity)], N[(N[Log[x], $MachinePrecision] / N[(N[(n * n), $MachinePrecision] * x), $MachinePrecision]), $MachinePrecision], If[LessEqual[t$95$0, 1e-15], N[(N[Log[N[(N[(1.0 + x), $MachinePrecision] / x), $MachinePrecision]], $MachinePrecision] / n), $MachinePrecision], N[(N[(1.0 / n), $MachinePrecision] / x), $MachinePrecision]]]]

Derivation

1. Split input into 3 regimes

2. if (-.f64 (pow.f64 (+.f64 x #s(literal 1 binary64)) (/.f64 #s(literal 1 binary64) n)) (pow.f64 x (/.f64 #s(literal 1 binary64) n))) < -inf.0

   1. Initial program 100.0%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n \cdot x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{\color{blue}{n \cdot x}} \]

      2. lower-exp.f64 N/A

         \[\leadsto \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{\color{blue}{n} \cdot x} \]

      3. mul-1-neg N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n \cdot x} \]

      4. log-rec N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n \cdot x} \]

      5. mul-1-neg N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{-1 \cdot \log x}{n}\right)}}{n \cdot x} \]

      6. lower-neg.f64 N/A

         \[\leadsto \frac{e^{-\frac{-1 \cdot \log x}{n}}}{n \cdot x} \]

      7. lower-/.f64 N/A

         \[\leadsto \frac{e^{-\frac{-1 \cdot \log x}{n}}}{n \cdot x} \]

      8. mul-1-neg N/A

         \[\leadsto \frac{e^{-\frac{\mathsf{neg}\left(\log x\right)}{n}}}{n \cdot x} \]

      9. lower-neg.f64 N/A

         \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot x} \]

      10. lower-log.f64 N/A

          \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot x} \]

      11. lower-*.f64 100.0

          \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot \color{blue}{x}} \]

   4. Applied rewrites 100.0%

      \[\leadsto \color{blue}{\frac{e^{-\frac{-\log x}{n}}}{n \cdot x}} \]

   5. Taylor expanded in n around inf

      \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{\color{blue}{n}} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{n} \]

      2. lower-+.f64 N/A

         \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{n} \]

      3. lower-/.f64 N/A

         \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{n} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{n} \]

      5. lift-log.f64 N/A

         \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{n} \]

      6. lift-*.f64 77.1

         \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{n} \]

   7. Applied rewrites 77.1%

      \[\leadsto \frac{\frac{1}{x} + \frac{\log x}{n \cdot x}}{\color{blue}{n}} \]

   8. Taylor expanded in n around 0

      \[\leadsto \frac{\log x}{{n}^{2} \cdot \color{blue}{x}} \]
   9. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log x}{{n}^{2} \cdot x} \]

      2. lift-log.f64 N/A

         \[\leadsto \frac{\log x}{{n}^{2} \cdot x} \]

      3. lower-*.f64 N/A

         \[\leadsto \frac{\log x}{{n}^{2} \cdot x} \]

      4. pow2 N/A

         \[\leadsto \frac{\log x}{\left(n \cdot n\right) \cdot x} \]

      5. lift-*.f64 77.1

         \[\leadsto \frac{\log x}{\left(n \cdot n\right) \cdot x} \]

   10. Applied rewrites 77.1%

       \[\leadsto \frac{\log x}{\left(n \cdot n\right) \cdot \color{blue}{x}} \]

   if -inf.0 < (-.f64 (pow.f64 (+.f64 x #s(literal 1 binary64)) (/.f64 #s(literal 1 binary64) n)) (pow.f64 x (/.f64 #s(literal 1 binary64) n))) < 1.0000000000000001e-15

   1. Initial program 43.5%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 80.0

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 80.0%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   if 1.0000000000000001e-15 < (-.f64 (pow.f64 (+.f64 x #s(literal 1 binary64)) (/.f64 #s(literal 1 binary64) n)) (pow.f64 x (/.f64 #s(literal 1 binary64) n)))

   1. Initial program 56.1%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 9.2

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 9.2%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{\color{blue}{x}} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

      2. lower--.f64 N/A

         \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

      3. lift-/.f64 N/A

         \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

      4. lower-*.f64 N/A

         \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

      6. lift-*.f64 0.5

         \[\leadsto \frac{\frac{1}{n} - 0.5 \cdot \frac{1}{n \cdot x}}{x} \]

   7. Applied rewrites 0.5%

      \[\leadsto \frac{\frac{1}{n} - 0.5 \cdot \frac{1}{n \cdot x}}{\color{blue}{x}} \]

   8. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{1}{n}}{x} \]
   9. Step-by-step derivation

      1. lift-/.f64 26.2

         \[\leadsto \frac{\frac{1}{n}}{x} \]

   10. Applied rewrites 26.2%

       \[\leadsto \frac{\frac{1}{n}}{x} \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 15: 61.2% accurate, 2.1× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq 0.99:\\ \;\;\;\;\frac{x + \left(-\log x\right)}{n}\\ \mathbf{elif}\;x \leq 8.2 \cdot 10^{+103}:\\ \;\;\;\;\frac{\frac{x - 0.5}{n}}{x \cdot x}\\ \mathbf{else}:\\ \;\;\;\;\frac{\log 1}{n}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (if (<= x 0.99)
   (/ (+ x (- (log x))) n)
   (if (<= x 8.2e+103) (/ (/ (- x 0.5) n) (* x x)) (/ (log 1.0) n))))

C

double code(double x, double n) {
	double tmp;
	if (x <= 0.99) {
		tmp = (x + -log(x)) / n;
	} else if (x <= 8.2e+103) {
		tmp = ((x - 0.5) / n) / (x * x);
	} else {
		tmp = log(1.0) / n;
	}
	return tmp;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    real(8) :: tmp
    if (x <= 0.99d0) then
        tmp = (x + -log(x)) / n
    else if (x <= 8.2d+103) then
        tmp = ((x - 0.5d0) / n) / (x * x)
    else
        tmp = log(1.0d0) / n
    end if
    code = tmp
end function

Java

public static double code(double x, double n) {
	double tmp;
	if (x <= 0.99) {
		tmp = (x + -Math.log(x)) / n;
	} else if (x <= 8.2e+103) {
		tmp = ((x - 0.5) / n) / (x * x);
	} else {
		tmp = Math.log(1.0) / n;
	}
	return tmp;
}

Python

def code(x, n):
	tmp = 0
	if x <= 0.99:
		tmp = (x + -math.log(x)) / n
	elif x <= 8.2e+103:
		tmp = ((x - 0.5) / n) / (x * x)
	else:
		tmp = math.log(1.0) / n
	return tmp

Julia

function code(x, n)
	tmp = 0.0
	if (x <= 0.99)
		tmp = Float64(Float64(x + Float64(-log(x))) / n);
	elseif (x <= 8.2e+103)
		tmp = Float64(Float64(Float64(x - 0.5) / n) / Float64(x * x));
	else
		tmp = Float64(log(1.0) / n);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	tmp = 0.0;
	if (x <= 0.99)
		tmp = (x + -log(x)) / n;
	elseif (x <= 8.2e+103)
		tmp = ((x - 0.5) / n) / (x * x);
	else
		tmp = log(1.0) / n;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := If[LessEqual[x, 0.99], N[(N[(x + (-N[Log[x], $MachinePrecision])), $MachinePrecision] / n), $MachinePrecision], If[LessEqual[x, 8.2e+103], N[(N[(N[(x - 0.5), $MachinePrecision] / n), $MachinePrecision] / N[(x * x), $MachinePrecision]), $MachinePrecision], N[(N[Log[1.0], $MachinePrecision] / n), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if x < 0.98999999999999999

   1. Initial program 43.0%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 51.9

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 51.9%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around 0

      \[\leadsto \frac{x + -1 \cdot \log x}{n} \]
   6. Step-by-step derivation

      1. log-pow-rev N/A

         \[\leadsto \frac{x + \log \left({x}^{-1}\right)}{n} \]

      2. inv-pow N/A

         \[\leadsto \frac{x + \log \left(\frac{1}{x}\right)}{n} \]

      3. lower-+.f64 N/A

         \[\leadsto \frac{x + \log \left(\frac{1}{x}\right)}{n} \]

      4. neg-log N/A

         \[\leadsto \frac{x + \left(\mathsf{neg}\left(\log x\right)\right)}{n} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{x + \left(-\log x\right)}{n} \]

      6. lift-log.f64 51.4

         \[\leadsto \frac{x + \left(-\log x\right)}{n} \]

   7. Applied rewrites 51.4%

      \[\leadsto \frac{x + \left(-\log x\right)}{n} \]

   if 0.98999999999999999 < x < 8.2000000000000003e103

   1. Initial program 44.9%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 81.8%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around 0

      \[\leadsto \frac{e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{x \cdot e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)}}{n}}{\color{blue}{{x}^{2}}} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{x \cdot e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)}}{n}}{{x}^{\color{blue}{2}}} \]

   7. Applied rewrites 81.7%

      \[\leadsto \frac{\mathsf{fma}\left(e^{--1 \cdot \frac{\log x}{n}}, 0.5 \cdot \frac{1}{n \cdot n} - 0.5 \cdot \frac{1}{n}, \frac{x \cdot e^{--1 \cdot \frac{\log x}{n}}}{n}\right)}{\color{blue}{x \cdot x}} \]

   8. Taylor expanded in n around inf

      \[\leadsto \frac{\frac{x - \frac{1}{2}}{n}}{x \cdot x} \]
   9. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{x - \frac{1}{2}}{n}}{x \cdot x} \]

      2. lower--.f64 65.4

         \[\leadsto \frac{\frac{x - 0.5}{n}}{x \cdot x} \]

   10. Applied rewrites 65.4%

       \[\leadsto \frac{\frac{x - 0.5}{n}}{x \cdot x} \]

   if 8.2000000000000003e103 < x

   1. Initial program 78.8%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 78.8

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 78.8%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\log 1}{n} \]
   6. Step-by-step derivation

   7. Applied rewrites 78.8%

      \[\leadsto \frac{\log 1}{n} \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 16: 60.9% accurate, 2.1× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq 0.68:\\ \;\;\;\;\frac{-\log x}{n}\\ \mathbf{elif}\;x \leq 8.2 \cdot 10^{+103}:\\ \;\;\;\;\frac{\frac{x - 0.5}{n}}{x \cdot x}\\ \mathbf{else}:\\ \;\;\;\;\frac{\log 1}{n}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (if (<= x 0.68)
   (/ (- (log x)) n)
   (if (<= x 8.2e+103) (/ (/ (- x 0.5) n) (* x x)) (/ (log 1.0) n))))

C

double code(double x, double n) {
	double tmp;
	if (x <= 0.68) {
		tmp = -log(x) / n;
	} else if (x <= 8.2e+103) {
		tmp = ((x - 0.5) / n) / (x * x);
	} else {
		tmp = log(1.0) / n;
	}
	return tmp;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    real(8) :: tmp
    if (x <= 0.68d0) then
        tmp = -log(x) / n
    else if (x <= 8.2d+103) then
        tmp = ((x - 0.5d0) / n) / (x * x)
    else
        tmp = log(1.0d0) / n
    end if
    code = tmp
end function

Java

public static double code(double x, double n) {
	double tmp;
	if (x <= 0.68) {
		tmp = -Math.log(x) / n;
	} else if (x <= 8.2e+103) {
		tmp = ((x - 0.5) / n) / (x * x);
	} else {
		tmp = Math.log(1.0) / n;
	}
	return tmp;
}

Python

def code(x, n):
	tmp = 0
	if x <= 0.68:
		tmp = -math.log(x) / n
	elif x <= 8.2e+103:
		tmp = ((x - 0.5) / n) / (x * x)
	else:
		tmp = math.log(1.0) / n
	return tmp

Julia

function code(x, n)
	tmp = 0.0
	if (x <= 0.68)
		tmp = Float64(Float64(-log(x)) / n);
	elseif (x <= 8.2e+103)
		tmp = Float64(Float64(Float64(x - 0.5) / n) / Float64(x * x));
	else
		tmp = Float64(log(1.0) / n);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	tmp = 0.0;
	if (x <= 0.68)
		tmp = -log(x) / n;
	elseif (x <= 8.2e+103)
		tmp = ((x - 0.5) / n) / (x * x);
	else
		tmp = log(1.0) / n;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := If[LessEqual[x, 0.68], N[((-N[Log[x], $MachinePrecision]) / n), $MachinePrecision], If[LessEqual[x, 8.2e+103], N[(N[(N[(x - 0.5), $MachinePrecision] / n), $MachinePrecision] / N[(x * x), $MachinePrecision]), $MachinePrecision], N[(N[Log[1.0], $MachinePrecision] / n), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if x < 0.680000000000000049

   1. Initial program 43.0%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 51.9

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 51.9%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around 0

      \[\leadsto \frac{-1 \cdot \log x}{n} \]
   6. Step-by-step derivation

      1. log-pow-rev N/A

         \[\leadsto \frac{\log \left({x}^{-1}\right)}{n} \]

      2. inv-pow N/A

         \[\leadsto \frac{\log \left(\frac{1}{x}\right)}{n} \]

      3. neg-log N/A

         \[\leadsto \frac{\mathsf{neg}\left(\log x\right)}{n} \]

      4. lift-neg.f64 N/A

         \[\leadsto \frac{-\log x}{n} \]

      5. lift-log.f64 51.0

         \[\leadsto \frac{-\log x}{n} \]

   7. Applied rewrites 51.0%

      \[\leadsto \frac{-\log x}{n} \]

   if 0.680000000000000049 < x < 8.2000000000000003e103

   1. Initial program 44.8%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in x around inf

      \[\leadsto \color{blue}{\frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{x}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n} + \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right)}{x}}{\color{blue}{x}} \]

   4. Applied rewrites 81.4%

      \[\leadsto \color{blue}{\frac{\mathsf{fma}\left(e^{-\frac{-\log x}{n}}, \frac{\frac{0.5}{n \cdot n} - \frac{0.5}{n}}{x}, \frac{e^{-\frac{-\log x}{n}}}{n}\right)}{x}} \]

   5. Taylor expanded in x around 0

      \[\leadsto \frac{e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{x \cdot e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)}}{n}}{\color{blue}{{x}^{2}}} \]
   6. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)} \cdot \left(\frac{1}{2} \cdot \frac{1}{{n}^{2}} - \frac{1}{2} \cdot \frac{1}{n}\right) + \frac{x \cdot e^{\mathsf{neg}\left(-1 \cdot \frac{\log x}{n}\right)}}{n}}{{x}^{\color{blue}{2}}} \]

   7. Applied rewrites 81.4%

      \[\leadsto \frac{\mathsf{fma}\left(e^{--1 \cdot \frac{\log x}{n}}, 0.5 \cdot \frac{1}{n \cdot n} - 0.5 \cdot \frac{1}{n}, \frac{x \cdot e^{--1 \cdot \frac{\log x}{n}}}{n}\right)}{\color{blue}{x \cdot x}} \]

   8. Taylor expanded in n around inf

      \[\leadsto \frac{\frac{x - \frac{1}{2}}{n}}{x \cdot x} \]
   9. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\frac{x - \frac{1}{2}}{n}}{x \cdot x} \]

      2. lower--.f64 65.2

         \[\leadsto \frac{\frac{x - 0.5}{n}}{x \cdot x} \]

   10. Applied rewrites 65.2%

       \[\leadsto \frac{\frac{x - 0.5}{n}}{x \cdot x} \]

   if 8.2000000000000003e103 < x

   1. Initial program 78.8%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 78.8

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 78.8%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\log 1}{n} \]
   6. Step-by-step derivation

   7. Applied rewrites 78.8%

      \[\leadsto \frac{\log 1}{n} \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 17: 60.2% accurate, 2.5× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq 8.5 \cdot 10^{-14}:\\ \;\;\;\;\frac{-\log x}{n}\\ \mathbf{elif}\;x \leq 8.2 \cdot 10^{+103}:\\ \;\;\;\;\frac{\frac{1}{x}}{n}\\ \mathbf{else}:\\ \;\;\;\;\frac{\log 1}{n}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (if (<= x 8.5e-14)
   (/ (- (log x)) n)
   (if (<= x 8.2e+103) (/ (/ 1.0 x) n) (/ (log 1.0) n))))

C

double code(double x, double n) {
	double tmp;
	if (x <= 8.5e-14) {
		tmp = -log(x) / n;
	} else if (x <= 8.2e+103) {
		tmp = (1.0 / x) / n;
	} else {
		tmp = log(1.0) / n;
	}
	return tmp;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    real(8) :: tmp
    if (x <= 8.5d-14) then
        tmp = -log(x) / n
    else if (x <= 8.2d+103) then
        tmp = (1.0d0 / x) / n
    else
        tmp = log(1.0d0) / n
    end if
    code = tmp
end function

Java

public static double code(double x, double n) {
	double tmp;
	if (x <= 8.5e-14) {
		tmp = -Math.log(x) / n;
	} else if (x <= 8.2e+103) {
		tmp = (1.0 / x) / n;
	} else {
		tmp = Math.log(1.0) / n;
	}
	return tmp;
}

Python

def code(x, n):
	tmp = 0
	if x <= 8.5e-14:
		tmp = -math.log(x) / n
	elif x <= 8.2e+103:
		tmp = (1.0 / x) / n
	else:
		tmp = math.log(1.0) / n
	return tmp

Julia

function code(x, n)
	tmp = 0.0
	if (x <= 8.5e-14)
		tmp = Float64(Float64(-log(x)) / n);
	elseif (x <= 8.2e+103)
		tmp = Float64(Float64(1.0 / x) / n);
	else
		tmp = Float64(log(1.0) / n);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	tmp = 0.0;
	if (x <= 8.5e-14)
		tmp = -log(x) / n;
	elseif (x <= 8.2e+103)
		tmp = (1.0 / x) / n;
	else
		tmp = log(1.0) / n;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := If[LessEqual[x, 8.5e-14], N[((-N[Log[x], $MachinePrecision]) / n), $MachinePrecision], If[LessEqual[x, 8.2e+103], N[(N[(1.0 / x), $MachinePrecision] / n), $MachinePrecision], N[(N[Log[1.0], $MachinePrecision] / n), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if x < 8.50000000000000038e-14

   1. Initial program 42.3%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 52.0

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 52.0%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around 0

      \[\leadsto \frac{-1 \cdot \log x}{n} \]
   6. Step-by-step derivation

      1. log-pow-rev N/A

         \[\leadsto \frac{\log \left({x}^{-1}\right)}{n} \]

      2. inv-pow N/A

         \[\leadsto \frac{\log \left(\frac{1}{x}\right)}{n} \]

      3. neg-log N/A

         \[\leadsto \frac{\mathsf{neg}\left(\log x\right)}{n} \]

      4. lift-neg.f64 N/A

         \[\leadsto \frac{-\log x}{n} \]

      5. lift-log.f64 52.0

         \[\leadsto \frac{-\log x}{n} \]

   7. Applied rewrites 52.0%

      \[\leadsto \frac{-\log x}{n} \]

   if 8.50000000000000038e-14 < x < 8.2000000000000003e103

   1. Initial program 46.6%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 47.7

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 47.7%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{1}{x}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 55.7

         \[\leadsto \frac{\frac{1}{x}}{n} \]

   7. Applied rewrites 55.7%

      \[\leadsto \frac{\frac{1}{x}}{n} \]

   if 8.2000000000000003e103 < x

   1. Initial program 78.8%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 78.8

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 78.8%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\log 1}{n} \]
   6. Step-by-step derivation

   7. Applied rewrites 78.8%

      \[\leadsto \frac{\log 1}{n} \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 18: 46.9% accurate, 2.6× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\frac{1}{n} \leq -2000000:\\ \;\;\;\;\frac{\log 1}{n}\\ \mathbf{else}:\\ \;\;\;\;\frac{\frac{1}{x}}{n}\\ \end{array} \end{array} \]

FPCore

(FPCore (x n)
 :precision binary64
 (if (<= (/ 1.0 n) -2000000.0) (/ (log 1.0) n) (/ (/ 1.0 x) n)))

C

double code(double x, double n) {
	double tmp;
	if ((1.0 / n) <= -2000000.0) {
		tmp = log(1.0) / n;
	} else {
		tmp = (1.0 / x) / n;
	}
	return tmp;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    real(8) :: tmp
    if ((1.0d0 / n) <= (-2000000.0d0)) then
        tmp = log(1.0d0) / n
    else
        tmp = (1.0d0 / x) / n
    end if
    code = tmp
end function

Java

public static double code(double x, double n) {
	double tmp;
	if ((1.0 / n) <= -2000000.0) {
		tmp = Math.log(1.0) / n;
	} else {
		tmp = (1.0 / x) / n;
	}
	return tmp;
}

Python

def code(x, n):
	tmp = 0
	if (1.0 / n) <= -2000000.0:
		tmp = math.log(1.0) / n
	else:
		tmp = (1.0 / x) / n
	return tmp

Julia

function code(x, n)
	tmp = 0.0
	if (Float64(1.0 / n) <= -2000000.0)
		tmp = Float64(log(1.0) / n);
	else
		tmp = Float64(Float64(1.0 / x) / n);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, n)
	tmp = 0.0;
	if ((1.0 / n) <= -2000000.0)
		tmp = log(1.0) / n;
	else
		tmp = (1.0 / x) / n;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, n_] := If[LessEqual[N[(1.0 / n), $MachinePrecision], -2000000.0], N[(N[Log[1.0], $MachinePrecision] / n), $MachinePrecision], N[(N[(1.0 / x), $MachinePrecision] / n), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if (/.f64 #s(literal 1 binary64) n) < -2e6

   1. Initial program 100.0%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 51.7

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 51.7%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\log 1}{n} \]
   6. Step-by-step derivation

   7. Applied rewrites 51.5%

      \[\leadsto \frac{\log 1}{n} \]

   if -2e6 < (/.f64 #s(literal 1 binary64) n)

   1. Initial program 35.4%

      \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

   2. Taylor expanded in n around inf

      \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
   3. Step-by-step derivation

      1. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

      2. diff-log N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      3. lower-log.f64 N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      4. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      5. lower-/.f64 N/A

         \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

      6. +-commutative N/A

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

      7. lower-+.f64 61.5

         \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. Applied rewrites 61.5%

      \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

   5. Taylor expanded in x around inf

      \[\leadsto \frac{\frac{1}{x}}{n} \]
   6. Step-by-step derivation

      1. lower-/.f64 45.2

         \[\leadsto \frac{\frac{1}{x}}{n} \]

   7. Applied rewrites 45.2%

      \[\leadsto \frac{\frac{1}{x}}{n} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 19: 40.6% accurate, 5.8× speedup

Math

\[\begin{array}{l} \\ \frac{\frac{1}{x}}{n} \end{array} \]

FPCore

(FPCore (x n) :precision binary64 (/ (/ 1.0 x) n))

C

double code(double x, double n) {
	return (1.0 / x) / n;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    code = (1.0d0 / x) / n
end function

Java

public static double code(double x, double n) {
	return (1.0 / x) / n;
}

Python

def code(x, n):
	return (1.0 / x) / n

Julia

function code(x, n)
	return Float64(Float64(1.0 / x) / n)
end

MATLAB

function tmp = code(x, n)
	tmp = (1.0 / x) / n;
end

Wolfram

code[x_, n_] := N[(N[(1.0 / x), $MachinePrecision] / n), $MachinePrecision]

Derivation

1. Initial program 53.3%

   \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

2. Taylor expanded in n around inf

   \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
3. Step-by-step derivation

   1. lower-/.f64 N/A

      \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

   2. diff-log N/A

      \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   3. lower-log.f64 N/A

      \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. +-commutative N/A

      \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

   5. lower-/.f64 N/A

      \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

   6. +-commutative N/A

      \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   7. lower-+.f64 58.8

      \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

4. Applied rewrites 58.8%

   \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

5. Taylor expanded in x around inf

   \[\leadsto \frac{\frac{1}{x}}{n} \]
6. Step-by-step derivation

   1. lower-/.f64 40.6

      \[\leadsto \frac{\frac{1}{x}}{n} \]

7. Applied rewrites 40.6%

   \[\leadsto \frac{\frac{1}{x}}{n} \]
8. Add Preprocessing

Alternative 20: 40.6% accurate, 5.8× speedup

Math

\[\begin{array}{l} \\ \frac{\frac{1}{n}}{x} \end{array} \]

FPCore

(FPCore (x n) :precision binary64 (/ (/ 1.0 n) x))

C

double code(double x, double n) {
	return (1.0 / n) / x;
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    code = (1.0d0 / n) / x
end function

Java

public static double code(double x, double n) {
	return (1.0 / n) / x;
}

Python

def code(x, n):
	return (1.0 / n) / x

Julia

function code(x, n)
	return Float64(Float64(1.0 / n) / x)
end

MATLAB

function tmp = code(x, n)
	tmp = (1.0 / n) / x;
end

Wolfram

code[x_, n_] := N[(N[(1.0 / n), $MachinePrecision] / x), $MachinePrecision]

Derivation

1. Initial program 53.3%

   \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

2. Taylor expanded in n around inf

   \[\leadsto \color{blue}{\frac{\log \left(1 + x\right) - \log x}{n}} \]
3. Step-by-step derivation

   1. lower-/.f64 N/A

      \[\leadsto \frac{\log \left(1 + x\right) - \log x}{\color{blue}{n}} \]

   2. diff-log N/A

      \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   3. lower-log.f64 N/A

      \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   4. +-commutative N/A

      \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

   5. lower-/.f64 N/A

      \[\leadsto \frac{\log \left(\frac{x + 1}{x}\right)}{n} \]

   6. +-commutative N/A

      \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

   7. lower-+.f64 58.8

      \[\leadsto \frac{\log \left(\frac{1 + x}{x}\right)}{n} \]

4. Applied rewrites 58.8%

   \[\leadsto \color{blue}{\frac{\log \left(\frac{1 + x}{x}\right)}{n}} \]

5. Taylor expanded in x around inf

   \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{\color{blue}{x}} \]
6. Step-by-step derivation

   1. lower-/.f64 N/A

      \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

   2. lower--.f64 N/A

      \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

   3. lift-/.f64 N/A

      \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

   4. lower-*.f64 N/A

      \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

   5. lower-/.f64 N/A

      \[\leadsto \frac{\frac{1}{n} - \frac{1}{2} \cdot \frac{1}{n \cdot x}}{x} \]

   6. lift-*.f64 28.4

      \[\leadsto \frac{\frac{1}{n} - 0.5 \cdot \frac{1}{n \cdot x}}{x} \]

7. Applied rewrites 28.4%

   \[\leadsto \frac{\frac{1}{n} - 0.5 \cdot \frac{1}{n \cdot x}}{\color{blue}{x}} \]

8. Taylor expanded in x around inf

   \[\leadsto \frac{\frac{1}{n}}{x} \]
9. Step-by-step derivation

   1. lift-/.f64 40.6

      \[\leadsto \frac{\frac{1}{n}}{x} \]

10. Applied rewrites 40.6%

    \[\leadsto \frac{\frac{1}{n}}{x} \]
11. Add Preprocessing

Alternative 21: 40.1% accurate, 6.1× speedup

Math

\[\begin{array}{l} \\ \frac{1}{n \cdot x} \end{array} \]

FPCore

(FPCore (x n) :precision binary64 (/ 1.0 (* n x)))

C

double code(double x, double n) {
	return 1.0 / (n * x);
}

Fortran

module fmin_fmax_functions
    implicit none
    private
    public fmax
    public fmin

    interface fmax
        module procedure fmax88
        module procedure fmax44
        module procedure fmax84
        module procedure fmax48
    end interface
    interface fmin
        module procedure fmin88
        module procedure fmin44
        module procedure fmin84
        module procedure fmin48
    end interface
contains
    real(8) function fmax88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(4) function fmax44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, max(x, y), y /= y), x /= x)
    end function
    real(8) function fmax84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, max(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmax48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), max(dble(x), y), y /= y), x /= x)
    end function
    real(8) function fmin88(x, y) result (res)
        real(8), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(4) function fmin44(x, y) result (res)
        real(4), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(y, merge(x, min(x, y), y /= y), x /= x)
    end function
    real(8) function fmin84(x, y) result(res)
        real(8), intent (in) :: x
        real(4), intent (in) :: y
        res = merge(dble(y), merge(x, min(x, dble(y)), y /= y), x /= x)
    end function
    real(8) function fmin48(x, y) result(res)
        real(4), intent (in) :: x
        real(8), intent (in) :: y
        res = merge(y, merge(dble(x), min(dble(x), y), y /= y), x /= x)
    end function
end module

real(8) function code(x, n)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: n
    code = 1.0d0 / (n * x)
end function

Java

public static double code(double x, double n) {
	return 1.0 / (n * x);
}

Python

def code(x, n):
	return 1.0 / (n * x)

Julia

function code(x, n)
	return Float64(1.0 / Float64(n * x))
end

MATLAB

function tmp = code(x, n)
	tmp = 1.0 / (n * x);
end

Wolfram

code[x_, n_] := N[(1.0 / N[(n * x), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 53.3%

   \[{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)} \]

2. Taylor expanded in x around inf

   \[\leadsto \color{blue}{\frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{n \cdot x}} \]
3. Step-by-step derivation

   1. lower-/.f64 N/A

      \[\leadsto \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{\color{blue}{n \cdot x}} \]

   2. lower-exp.f64 N/A

      \[\leadsto \frac{e^{-1 \cdot \frac{\log \left(\frac{1}{x}\right)}{n}}}{\color{blue}{n} \cdot x} \]

   3. mul-1-neg N/A

      \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{\log \left(\frac{1}{x}\right)}{n}\right)}}{n \cdot x} \]

   4. log-rec N/A

      \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{\mathsf{neg}\left(\log x\right)}{n}\right)}}{n \cdot x} \]

   5. mul-1-neg N/A

      \[\leadsto \frac{e^{\mathsf{neg}\left(\frac{-1 \cdot \log x}{n}\right)}}{n \cdot x} \]

   6. lower-neg.f64 N/A

      \[\leadsto \frac{e^{-\frac{-1 \cdot \log x}{n}}}{n \cdot x} \]

   7. lower-/.f64 N/A

      \[\leadsto \frac{e^{-\frac{-1 \cdot \log x}{n}}}{n \cdot x} \]

   8. mul-1-neg N/A

      \[\leadsto \frac{e^{-\frac{\mathsf{neg}\left(\log x\right)}{n}}}{n \cdot x} \]

   9. lower-neg.f64 N/A

      \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot x} \]

   10. lower-log.f64 N/A

       \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot x} \]

   11. lower-*.f64 57.4

       \[\leadsto \frac{e^{-\frac{-\log x}{n}}}{n \cdot \color{blue}{x}} \]

4. Applied rewrites 57.4%

   \[\leadsto \color{blue}{\frac{e^{-\frac{-\log x}{n}}}{n \cdot x}} \]

5. Taylor expanded in n around inf

   \[\leadsto \frac{1}{\color{blue}{n} \cdot x} \]
6. Step-by-step derivation

7. Applied rewrites 40.1%

   \[\leadsto \frac{1}{\color{blue}{n} \cdot x} \]
8. Add Preprocessing

Reproduce

herbie shell --seed 2025117 
(FPCore (x n)
  :name "2nthrt (problem 3.4.6)"
  :precision binary64
  (- (pow (+ x 1.0) (/ 1.0 n)) (pow x (/ 1.0 n))))