Numeric.SpecFunctions:stirlingError from math-functions-0.1.5.2

Percentage Accurate: 99.8% → 99.9%

Time: 8.0s

Alternatives: 7

Speedup: 1.0×

Specification

Math

\[\begin{array}{l} \\ \left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \end{array} \]

FPCore

(FPCore (x y z) :precision binary64 (- (+ (- x (* (+ y 0.5) (log y))) y) z))

C

double code(double x, double y, double z) {
	return ((x - ((y + 0.5) * log(y))) + y) - z;
}

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, y, z)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    code = ((x - ((y + 0.5d0) * log(y))) + y) - z
end function

Java

public static double code(double x, double y, double z) {
	return ((x - ((y + 0.5) * Math.log(y))) + y) - z;
}

Python

def code(x, y, z):
	return ((x - ((y + 0.5) * math.log(y))) + y) - z

Julia

function code(x, y, z)
	return Float64(Float64(Float64(x - Float64(Float64(y + 0.5) * log(y))) + y) - z)
end

MATLAB

function tmp = code(x, y, z)
	tmp = ((x - ((y + 0.5) * log(y))) + y) - z;
end

Wolfram

code[x_, y_, z_] := N[(N[(N[(x - N[(N[(y + 0.5), $MachinePrecision] * N[Log[y], $MachinePrecision]), $MachinePrecision]), $MachinePrecision] + y), $MachinePrecision] - z), $MachinePrecision]

Initial Program: 99.8% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \end{array} \]

FPCore

(FPCore (x y z) :precision binary64 (- (+ (- x (* (+ y 0.5) (log y))) y) z))

C

double code(double x, double y, double z) {
	return ((x - ((y + 0.5) * log(y))) + y) - z;
}

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, y, z)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    code = ((x - ((y + 0.5d0) * log(y))) + y) - z
end function

Java

public static double code(double x, double y, double z) {
	return ((x - ((y + 0.5) * Math.log(y))) + y) - z;
}

Python

def code(x, y, z):
	return ((x - ((y + 0.5) * math.log(y))) + y) - z

Julia

function code(x, y, z)
	return Float64(Float64(Float64(x - Float64(Float64(y + 0.5) * log(y))) + y) - z)
end

MATLAB

function tmp = code(x, y, z)
	tmp = ((x - ((y + 0.5) * log(y))) + y) - z;
end

Wolfram

code[x_, y_, z_] := N[(N[(N[(x - N[(N[(y + 0.5), $MachinePrecision] * N[Log[y], $MachinePrecision]), $MachinePrecision]), $MachinePrecision] + y), $MachinePrecision] - z), $MachinePrecision]

Alternative 1: 99.9% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \left(x + \mathsf{fma}\left(-0.5 - y, \log y, y\right)\right) - z \end{array} \]

FPCore

(FPCore (x y z) :precision binary64 (- (+ x (fma (- -0.5 y) (log y) y)) z))

C

double code(double x, double y, double z) {
	return (x + fma((-0.5 - y), log(y), y)) - z;
}

Julia

function code(x, y, z)
	return Float64(Float64(x + fma(Float64(-0.5 - y), log(y), y)) - z)
end

Wolfram

code[x_, y_, z_] := N[(N[(x + N[(N[(-0.5 - y), $MachinePrecision] * N[Log[y], $MachinePrecision] + y), $MachinePrecision]), $MachinePrecision] - z), $MachinePrecision]

Derivation

1. Initial program 99.8%

   \[\left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \]
2. Step-by-step derivation

   1. lift-+.f64 N/A

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

   2. lift--.f64 N/A

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

   3. sub-flip N/A

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

   4. associate-+l+ N/A

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

   5. lower-+.f64 N/A

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

   6. lift-*.f64 N/A

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

   7. distribute-lft-neg-out N/A

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

   8. lower-fma.f64 N/A

      \[\leadsto \left(x + \color{blue}{\mathsf{fma}\left(\mathsf{neg}\left(\left(y + \frac{1}{2}\right)\right), \log y, y\right)}\right) - z \]

   9. lift-+.f64 N/A

      \[\leadsto \left(x + \mathsf{fma}\left(\mathsf{neg}\left(\color{blue}{\left(y + \frac{1}{2}\right)}\right), \log y, y\right)\right) - z \]

   10. add-flip N/A

       \[\leadsto \left(x + \mathsf{fma}\left(\mathsf{neg}\left(\color{blue}{\left(y - \left(\mathsf{neg}\left(\frac{1}{2}\right)\right)\right)}\right), \log y, y\right)\right) - z \]

   11. sub-negate N/A

       \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{\left(\mathsf{neg}\left(\frac{1}{2}\right)\right) - y}, \log y, y\right)\right) - z \]

   12. lower--.f64 N/A

       \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{\left(\mathsf{neg}\left(\frac{1}{2}\right)\right) - y}, \log y, y\right)\right) - z \]

   13. metadata-eval 99.9

       \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{-0.5} - y, \log y, y\right)\right) - z \]

3. Applied rewrites 99.9%

   \[\leadsto \color{blue}{\left(x + \mathsf{fma}\left(-0.5 - y, \log y, y\right)\right) - z} \]
4. Add Preprocessing

Alternative 2: 89.3% accurate, 0.8× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \mathsf{fma}\left(-0.5, \log y, x - z\right)\\ \mathbf{if}\;x \leq -9 \cdot 10^{+29}:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;x \leq 1.78 \cdot 10^{+87}:\\ \;\;\;\;\mathsf{fma}\left(\log y, -0.5 - y, y\right) - z\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (let* ((t_0 (fma -0.5 (log y) (- x z))))
   (if (<= x -9e+29)
     t_0
     (if (<= x 1.78e+87) (- (fma (log y) (- -0.5 y) y) z) t_0))))

C

double code(double x, double y, double z) {
	double t_0 = fma(-0.5, log(y), (x - z));
	double tmp;
	if (x <= -9e+29) {
		tmp = t_0;
	} else if (x <= 1.78e+87) {
		tmp = fma(log(y), (-0.5 - y), y) - z;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Julia

function code(x, y, z)
	t_0 = fma(-0.5, log(y), Float64(x - z))
	tmp = 0.0
	if (x <= -9e+29)
		tmp = t_0;
	elseif (x <= 1.78e+87)
		tmp = Float64(fma(log(y), Float64(-0.5 - y), y) - z);
	else
		tmp = t_0;
	end
	return tmp
end

Wolfram

code[x_, y_, z_] := Block[{t$95$0 = N[(-0.5 * N[Log[y], $MachinePrecision] + N[(x - z), $MachinePrecision]), $MachinePrecision]}, If[LessEqual[x, -9e+29], t$95$0, If[LessEqual[x, 1.78e+87], N[(N[(N[Log[y], $MachinePrecision] * N[(-0.5 - y), $MachinePrecision] + y), $MachinePrecision] - z), $MachinePrecision], t$95$0]]]

Derivation

1. Split input into 2 regimes

2. if x < -9.0000000000000005e29 or 1.78e87 < x

   1. Initial program 99.8%

      \[\left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \]
   2. Step-by-step derivation

      1. lift-+.f64 N/A

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

      2. lift--.f64 N/A

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

      3. sub-flip N/A

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

      4. associate-+l+ N/A

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

      5. lower-+.f64 N/A

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

      6. lift-*.f64 N/A

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

      7. distribute-lft-neg-out N/A

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

      8. lower-fma.f64 N/A

         \[\leadsto \left(x + \color{blue}{\mathsf{fma}\left(\mathsf{neg}\left(\left(y + \frac{1}{2}\right)\right), \log y, y\right)}\right) - z \]

      9. lift-+.f64 N/A

         \[\leadsto \left(x + \mathsf{fma}\left(\mathsf{neg}\left(\color{blue}{\left(y + \frac{1}{2}\right)}\right), \log y, y\right)\right) - z \]

      10. add-flip N/A

          \[\leadsto \left(x + \mathsf{fma}\left(\mathsf{neg}\left(\color{blue}{\left(y - \left(\mathsf{neg}\left(\frac{1}{2}\right)\right)\right)}\right), \log y, y\right)\right) - z \]

      11. sub-negate N/A

          \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{\left(\mathsf{neg}\left(\frac{1}{2}\right)\right) - y}, \log y, y\right)\right) - z \]

      12. lower--.f64 N/A

          \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{\left(\mathsf{neg}\left(\frac{1}{2}\right)\right) - y}, \log y, y\right)\right) - z \]

      13. metadata-eval 99.9

          \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{-0.5} - y, \log y, y\right)\right) - z \]

   3. Applied rewrites 99.9%

      \[\leadsto \color{blue}{\left(x + \mathsf{fma}\left(-0.5 - y, \log y, y\right)\right) - z} \]
   4. Step-by-step derivation

      1. lift--.f64 N/A

         \[\leadsto \color{blue}{\left(x + \mathsf{fma}\left(\frac{-1}{2} - y, \log y, y\right)\right) - z} \]

      2. sub-flip N/A

         \[\leadsto \color{blue}{\left(x + \mathsf{fma}\left(\frac{-1}{2} - y, \log y, y\right)\right) + \left(\mathsf{neg}\left(z\right)\right)} \]

      3. lift-+.f64 N/A

         \[\leadsto \color{blue}{\left(x + \mathsf{fma}\left(\frac{-1}{2} - y, \log y, y\right)\right)} + \left(\mathsf{neg}\left(z\right)\right) \]

      4. lift-fma.f64 N/A

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

      5. associate-+r+ N/A

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

      6. lift--.f64 N/A

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

      7. sub-negate-rev N/A

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

      8. metadata-eval N/A

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

      9. add-flip N/A

         \[\leadsto \left(\left(x + \left(\mathsf{neg}\left(\color{blue}{\left(y + \frac{1}{2}\right)}\right)\right) \cdot \log y\right) + y\right) + \left(\mathsf{neg}\left(z\right)\right) \]

      10. fp-cancel-sub-sign-inv N/A

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

      11. lift-log.f64 N/A

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

      12. sub-flip N/A

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

   5. Applied rewrites 99.8%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\left(\frac{y}{\log y \cdot \left(-0.5 - y\right)} + 1\right) \cdot \left(-0.5 - y\right), \log y, x - z\right)} \]

   6. Taylor expanded in y around 0

      \[\leadsto \mathsf{fma}\left(\color{blue}{\frac{-1}{2}}, \log y, x - z\right) \]
   7. Step-by-step derivation

   8. Applied rewrites 70.7%

      \[\leadsto \mathsf{fma}\left(\color{blue}{-0.5}, \log y, x - z\right) \]

   if -9.0000000000000005e29 < x < 1.78e87

   1. Initial program 99.8%

      \[\left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \]

   2. Taylor expanded in x around 0

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

      1. lower--.f64 N/A

         \[\leadsto \left(y - \color{blue}{\log y \cdot \left(\frac{1}{2} + y\right)}\right) - z \]

      2. lower-*.f64 N/A

         \[\leadsto \left(y - \log y \cdot \color{blue}{\left(\frac{1}{2} + y\right)}\right) - z \]

      3. lower-log.f64 N/A

         \[\leadsto \left(y - \log y \cdot \left(\color{blue}{\frac{1}{2}} + y\right)\right) - z \]

      4. lower-+.f64 71.4

         \[\leadsto \left(y - \log y \cdot \left(0.5 + \color{blue}{y}\right)\right) - z \]

   4. Applied rewrites 71.4%

      \[\leadsto \color{blue}{\left(y - \log y \cdot \left(0.5 + y\right)\right)} - z \]
   5. Step-by-step derivation

      1. lift--.f64 N/A

         \[\leadsto \left(y - \color{blue}{\log y \cdot \left(\frac{1}{2} + y\right)}\right) - z \]

      2. lift-*.f64 N/A

         \[\leadsto \left(y - \log y \cdot \color{blue}{\left(\frac{1}{2} + y\right)}\right) - z \]

      3. *-commutative N/A

         \[\leadsto \left(y - \left(\frac{1}{2} + y\right) \cdot \color{blue}{\log y}\right) - z \]

      4. lift-+.f64 N/A

         \[\leadsto \left(y - \left(\frac{1}{2} + y\right) \cdot \log \color{blue}{y}\right) - z \]

      5. +-commutative N/A

         \[\leadsto \left(y - \left(y + \frac{1}{2}\right) \cdot \log \color{blue}{y}\right) - z \]

      6. add-flip N/A

         \[\leadsto \left(y - \left(y - \left(\mathsf{neg}\left(\frac{1}{2}\right)\right)\right) \cdot \log \color{blue}{y}\right) - z \]

      7. metadata-eval N/A

         \[\leadsto \left(y - \left(y - \frac{-1}{2}\right) \cdot \log y\right) - z \]

      8. sub-negate-rev N/A

         \[\leadsto \left(y - \left(\mathsf{neg}\left(\left(\frac{-1}{2} - y\right)\right)\right) \cdot \log \color{blue}{y}\right) - z \]

      9. lift--.f64 N/A

         \[\leadsto \left(y - \left(\mathsf{neg}\left(\left(\frac{-1}{2} - y\right)\right)\right) \cdot \log y\right) - z \]

      10. fp-cancel-sign-sub-inv N/A

          \[\leadsto \left(y + \color{blue}{\left(\frac{-1}{2} - y\right) \cdot \log y}\right) - z \]

      11. +-commutative N/A

          \[\leadsto \left(\left(\frac{-1}{2} - y\right) \cdot \log y + \color{blue}{y}\right) - z \]

      12. *-commutative N/A

          \[\leadsto \left(\log y \cdot \left(\frac{-1}{2} - y\right) + y\right) - z \]

      13. lower-fma.f64 71.5

          \[\leadsto \mathsf{fma}\left(\log y, \color{blue}{-0.5 - y}, y\right) - z \]

   6. Applied rewrites 71.5%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\log y, -0.5 - y, y\right)} - z \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 3: 82.6% accurate, 1.1× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;y \leq 9 \cdot 10^{+196}:\\ \;\;\;\;\mathsf{fma}\left(-0.5, \log y, x - z\right)\\ \mathbf{else}:\\ \;\;\;\;\left(1 - \log y\right) \cdot y\\ \end{array} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (if (<= y 9e+196) (fma -0.5 (log y) (- x z)) (* (- 1.0 (log y)) y)))

C

double code(double x, double y, double z) {
	double tmp;
	if (y <= 9e+196) {
		tmp = fma(-0.5, log(y), (x - z));
	} else {
		tmp = (1.0 - log(y)) * y;
	}
	return tmp;
}

Julia

function code(x, y, z)
	tmp = 0.0
	if (y <= 9e+196)
		tmp = fma(-0.5, log(y), Float64(x - z));
	else
		tmp = Float64(Float64(1.0 - log(y)) * y);
	end
	return tmp
end

Wolfram

code[x_, y_, z_] := If[LessEqual[y, 9e+196], N[(-0.5 * N[Log[y], $MachinePrecision] + N[(x - z), $MachinePrecision]), $MachinePrecision], N[(N[(1.0 - N[Log[y], $MachinePrecision]), $MachinePrecision] * y), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if y < 8.99999999999999956e196

   1. Initial program 99.8%

      \[\left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \]
   2. Step-by-step derivation

      1. lift-+.f64 N/A

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

      2. lift--.f64 N/A

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

      3. sub-flip N/A

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

      4. associate-+l+ N/A

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

      5. lower-+.f64 N/A

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

      6. lift-*.f64 N/A

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

      7. distribute-lft-neg-out N/A

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

      8. lower-fma.f64 N/A

         \[\leadsto \left(x + \color{blue}{\mathsf{fma}\left(\mathsf{neg}\left(\left(y + \frac{1}{2}\right)\right), \log y, y\right)}\right) - z \]

      9. lift-+.f64 N/A

         \[\leadsto \left(x + \mathsf{fma}\left(\mathsf{neg}\left(\color{blue}{\left(y + \frac{1}{2}\right)}\right), \log y, y\right)\right) - z \]

      10. add-flip N/A

          \[\leadsto \left(x + \mathsf{fma}\left(\mathsf{neg}\left(\color{blue}{\left(y - \left(\mathsf{neg}\left(\frac{1}{2}\right)\right)\right)}\right), \log y, y\right)\right) - z \]

      11. sub-negate N/A

          \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{\left(\mathsf{neg}\left(\frac{1}{2}\right)\right) - y}, \log y, y\right)\right) - z \]

      12. lower--.f64 N/A

          \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{\left(\mathsf{neg}\left(\frac{1}{2}\right)\right) - y}, \log y, y\right)\right) - z \]

      13. metadata-eval 99.9

          \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{-0.5} - y, \log y, y\right)\right) - z \]

   3. Applied rewrites 99.9%

      \[\leadsto \color{blue}{\left(x + \mathsf{fma}\left(-0.5 - y, \log y, y\right)\right) - z} \]
   4. Step-by-step derivation

      1. lift--.f64 N/A

         \[\leadsto \color{blue}{\left(x + \mathsf{fma}\left(\frac{-1}{2} - y, \log y, y\right)\right) - z} \]

      2. sub-flip N/A

         \[\leadsto \color{blue}{\left(x + \mathsf{fma}\left(\frac{-1}{2} - y, \log y, y\right)\right) + \left(\mathsf{neg}\left(z\right)\right)} \]

      3. lift-+.f64 N/A

         \[\leadsto \color{blue}{\left(x + \mathsf{fma}\left(\frac{-1}{2} - y, \log y, y\right)\right)} + \left(\mathsf{neg}\left(z\right)\right) \]

      4. lift-fma.f64 N/A

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

      5. associate-+r+ N/A

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

      6. lift--.f64 N/A

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

      7. sub-negate-rev N/A

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

      8. metadata-eval N/A

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

      9. add-flip N/A

         \[\leadsto \left(\left(x + \left(\mathsf{neg}\left(\color{blue}{\left(y + \frac{1}{2}\right)}\right)\right) \cdot \log y\right) + y\right) + \left(\mathsf{neg}\left(z\right)\right) \]

      10. fp-cancel-sub-sign-inv N/A

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

      11. lift-log.f64 N/A

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

      12. sub-flip N/A

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

   5. Applied rewrites 99.8%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\left(\frac{y}{\log y \cdot \left(-0.5 - y\right)} + 1\right) \cdot \left(-0.5 - y\right), \log y, x - z\right)} \]

   6. Taylor expanded in y around 0

      \[\leadsto \mathsf{fma}\left(\color{blue}{\frac{-1}{2}}, \log y, x - z\right) \]
   7. Step-by-step derivation

   8. Applied rewrites 70.7%

      \[\leadsto \mathsf{fma}\left(\color{blue}{-0.5}, \log y, x - z\right) \]

   if 8.99999999999999956e196 < y

   1. Initial program 99.8%

      \[\left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \]

   2. Taylor expanded in y around -inf

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

      1. lower-*.f64 N/A

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

      2. lower-+.f64 N/A

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

      3. lower-log.f64 N/A

         \[\leadsto y \cdot \left(1 + \log \left(\frac{1}{y}\right)\right) \]

      4. lower-/.f64 30.7

         \[\leadsto y \cdot \left(1 + \log \left(\frac{1}{y}\right)\right) \]

   4. Applied rewrites 30.7%

      \[\leadsto \color{blue}{y \cdot \left(1 + \log \left(\frac{1}{y}\right)\right)} \]
   5. Step-by-step derivation

      1. lift-*.f64 N/A

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

      2. *-commutative N/A

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

      3. lower-*.f64 30.7

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

      4. lift-+.f64 N/A

         \[\leadsto \left(1 + \log \left(\frac{1}{y}\right)\right) \cdot y \]

      5. lift-log.f64 N/A

         \[\leadsto \left(1 + \log \left(\frac{1}{y}\right)\right) \cdot y \]

      6. lift-/.f64 N/A

         \[\leadsto \left(1 + \log \left(\frac{1}{y}\right)\right) \cdot y \]

      7. log-rec N/A

         \[\leadsto \left(1 + \left(\mathsf{neg}\left(\log y\right)\right)\right) \cdot y \]

      8. lift-log.f64 N/A

         \[\leadsto \left(1 + \left(\mathsf{neg}\left(\log y\right)\right)\right) \cdot y \]

      9. sub-flip-reverse N/A

         \[\leadsto \left(1 - \log y\right) \cdot y \]

      10. lower--.f64 30.7

          \[\leadsto \left(1 - \log y\right) \cdot y \]

   6. Applied rewrites 30.7%

      \[\leadsto \color{blue}{\left(1 - \log y\right) \cdot y} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 4: 73.8% accurate, 0.3× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \mathsf{fma}\left(1, x, y - z\right)\\ t_1 := \left(x - \left(y + 0.5\right) \cdot \log y\right) + y\\ \mathbf{if}\;t\_1 \leq -1 \cdot 10^{+241}:\\ \;\;\;\;\left(1 - \log y\right) \cdot y\\ \mathbf{elif}\;t\_1 \leq -1 \cdot 10^{+30}:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;t\_1 \leq 500:\\ \;\;\;\;-0.5 \cdot \log y - z\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (let* ((t_0 (fma 1.0 x (- y z))) (t_1 (+ (- x (* (+ y 0.5) (log y))) y)))
   (if (<= t_1 -1e+241)
     (* (- 1.0 (log y)) y)
     (if (<= t_1 -1e+30) t_0 (if (<= t_1 500.0) (- (* -0.5 (log y)) z) t_0)))))

C

double code(double x, double y, double z) {
	double t_0 = fma(1.0, x, (y - z));
	double t_1 = (x - ((y + 0.5) * log(y))) + y;
	double tmp;
	if (t_1 <= -1e+241) {
		tmp = (1.0 - log(y)) * y;
	} else if (t_1 <= -1e+30) {
		tmp = t_0;
	} else if (t_1 <= 500.0) {
		tmp = (-0.5 * log(y)) - z;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Julia

function code(x, y, z)
	t_0 = fma(1.0, x, Float64(y - z))
	t_1 = Float64(Float64(x - Float64(Float64(y + 0.5) * log(y))) + y)
	tmp = 0.0
	if (t_1 <= -1e+241)
		tmp = Float64(Float64(1.0 - log(y)) * y);
	elseif (t_1 <= -1e+30)
		tmp = t_0;
	elseif (t_1 <= 500.0)
		tmp = Float64(Float64(-0.5 * log(y)) - z);
	else
		tmp = t_0;
	end
	return tmp
end

Wolfram

code[x_, y_, z_] := Block[{t$95$0 = N[(1.0 * x + N[(y - z), $MachinePrecision]), $MachinePrecision]}, Block[{t$95$1 = N[(N[(x - N[(N[(y + 0.5), $MachinePrecision] * N[Log[y], $MachinePrecision]), $MachinePrecision]), $MachinePrecision] + y), $MachinePrecision]}, If[LessEqual[t$95$1, -1e+241], N[(N[(1.0 - N[Log[y], $MachinePrecision]), $MachinePrecision] * y), $MachinePrecision], If[LessEqual[t$95$1, -1e+30], t$95$0, If[LessEqual[t$95$1, 500.0], N[(N[(-0.5 * N[Log[y], $MachinePrecision]), $MachinePrecision] - z), $MachinePrecision], t$95$0]]]]]

Derivation

1. Split input into 3 regimes

2. if (+.f64 (-.f64 x (*.f64 (+.f64 y #s(literal 1/2 binary64)) (log.f64 y))) y) < -1.0000000000000001e241

   1. Initial program 99.8%

      \[\left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \]

   2. Taylor expanded in y around -inf

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

      1. lower-*.f64 N/A

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

      2. lower-+.f64 N/A

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

      3. lower-log.f64 N/A

         \[\leadsto y \cdot \left(1 + \log \left(\frac{1}{y}\right)\right) \]

      4. lower-/.f64 30.7

         \[\leadsto y \cdot \left(1 + \log \left(\frac{1}{y}\right)\right) \]

   4. Applied rewrites 30.7%

      \[\leadsto \color{blue}{y \cdot \left(1 + \log \left(\frac{1}{y}\right)\right)} \]
   5. Step-by-step derivation

      1. lift-*.f64 N/A

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

      2. *-commutative N/A

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

      3. lower-*.f64 30.7

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

      4. lift-+.f64 N/A

         \[\leadsto \left(1 + \log \left(\frac{1}{y}\right)\right) \cdot y \]

      5. lift-log.f64 N/A

         \[\leadsto \left(1 + \log \left(\frac{1}{y}\right)\right) \cdot y \]

      6. lift-/.f64 N/A

         \[\leadsto \left(1 + \log \left(\frac{1}{y}\right)\right) \cdot y \]

      7. log-rec N/A

         \[\leadsto \left(1 + \left(\mathsf{neg}\left(\log y\right)\right)\right) \cdot y \]

      8. lift-log.f64 N/A

         \[\leadsto \left(1 + \left(\mathsf{neg}\left(\log y\right)\right)\right) \cdot y \]

      9. sub-flip-reverse N/A

         \[\leadsto \left(1 - \log y\right) \cdot y \]

      10. lower--.f64 30.7

          \[\leadsto \left(1 - \log y\right) \cdot y \]

   6. Applied rewrites 30.7%

      \[\leadsto \color{blue}{\left(1 - \log y\right) \cdot y} \]

   if -1.0000000000000001e241 < (+.f64 (-.f64 x (*.f64 (+.f64 y #s(literal 1/2 binary64)) (log.f64 y))) y) < -1e30 or 500 < (+.f64 (-.f64 x (*.f64 (+.f64 y #s(literal 1/2 binary64)) (log.f64 y))) y)

   1. Initial program 99.8%

      \[\left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \]
   2. Step-by-step derivation

      1. lift-+.f64 N/A

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

      2. lift--.f64 N/A

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

      3. sub-flip N/A

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

      4. associate-+l+ N/A

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

      5. lower-+.f64 N/A

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

      6. lift-*.f64 N/A

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

      7. distribute-lft-neg-out N/A

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

      8. lower-fma.f64 N/A

         \[\leadsto \left(x + \color{blue}{\mathsf{fma}\left(\mathsf{neg}\left(\left(y + \frac{1}{2}\right)\right), \log y, y\right)}\right) - z \]

      9. lift-+.f64 N/A

         \[\leadsto \left(x + \mathsf{fma}\left(\mathsf{neg}\left(\color{blue}{\left(y + \frac{1}{2}\right)}\right), \log y, y\right)\right) - z \]

      10. add-flip N/A

          \[\leadsto \left(x + \mathsf{fma}\left(\mathsf{neg}\left(\color{blue}{\left(y - \left(\mathsf{neg}\left(\frac{1}{2}\right)\right)\right)}\right), \log y, y\right)\right) - z \]

      11. sub-negate N/A

          \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{\left(\mathsf{neg}\left(\frac{1}{2}\right)\right) - y}, \log y, y\right)\right) - z \]

      12. lower--.f64 N/A

          \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{\left(\mathsf{neg}\left(\frac{1}{2}\right)\right) - y}, \log y, y\right)\right) - z \]

      13. metadata-eval 99.9

          \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{-0.5} - y, \log y, y\right)\right) - z \]

   3. Applied rewrites 99.9%

      \[\leadsto \color{blue}{\left(x + \mathsf{fma}\left(-0.5 - y, \log y, y\right)\right) - z} \]

   5. Applied rewrites 88.1%

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

   6. Taylor expanded in x around inf

      \[\leadsto \mathsf{fma}\left(\color{blue}{1}, x, y - z\right) \]
   7. Step-by-step derivation

   8. Applied rewrites 57.6%

      \[\leadsto \mathsf{fma}\left(\color{blue}{1}, x, y - z\right) \]

   if -1e30 < (+.f64 (-.f64 x (*.f64 (+.f64 y #s(literal 1/2 binary64)) (log.f64 y))) y) < 500

   1. Initial program 99.8%

      \[\left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \]

   2. Taylor expanded in x around 0

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

      1. lower--.f64 N/A

         \[\leadsto \left(y - \color{blue}{\log y \cdot \left(\frac{1}{2} + y\right)}\right) - z \]

      2. lower-*.f64 N/A

         \[\leadsto \left(y - \log y \cdot \color{blue}{\left(\frac{1}{2} + y\right)}\right) - z \]

      3. lower-log.f64 N/A

         \[\leadsto \left(y - \log y \cdot \left(\color{blue}{\frac{1}{2}} + y\right)\right) - z \]

      4. lower-+.f64 71.4

         \[\leadsto \left(y - \log y \cdot \left(0.5 + \color{blue}{y}\right)\right) - z \]

   4. Applied rewrites 71.4%

      \[\leadsto \color{blue}{\left(y - \log y \cdot \left(0.5 + y\right)\right)} - z \]
   5. Step-by-step derivation

      1. lift--.f64 N/A

         \[\leadsto \left(y - \color{blue}{\log y \cdot \left(\frac{1}{2} + y\right)}\right) - z \]

      2. lift-*.f64 N/A

         \[\leadsto \left(y - \log y \cdot \color{blue}{\left(\frac{1}{2} + y\right)}\right) - z \]

      3. *-commutative N/A

         \[\leadsto \left(y - \left(\frac{1}{2} + y\right) \cdot \color{blue}{\log y}\right) - z \]

      4. lift-+.f64 N/A

         \[\leadsto \left(y - \left(\frac{1}{2} + y\right) \cdot \log \color{blue}{y}\right) - z \]

      5. +-commutative N/A

         \[\leadsto \left(y - \left(y + \frac{1}{2}\right) \cdot \log \color{blue}{y}\right) - z \]

      6. add-flip N/A

         \[\leadsto \left(y - \left(y - \left(\mathsf{neg}\left(\frac{1}{2}\right)\right)\right) \cdot \log \color{blue}{y}\right) - z \]

      7. metadata-eval N/A

         \[\leadsto \left(y - \left(y - \frac{-1}{2}\right) \cdot \log y\right) - z \]

      8. sub-negate-rev N/A

         \[\leadsto \left(y - \left(\mathsf{neg}\left(\left(\frac{-1}{2} - y\right)\right)\right) \cdot \log \color{blue}{y}\right) - z \]

      9. lift--.f64 N/A

         \[\leadsto \left(y - \left(\mathsf{neg}\left(\left(\frac{-1}{2} - y\right)\right)\right) \cdot \log y\right) - z \]

      10. fp-cancel-sign-sub-inv N/A

          \[\leadsto \left(y + \color{blue}{\left(\frac{-1}{2} - y\right) \cdot \log y}\right) - z \]

      11. +-commutative N/A

          \[\leadsto \left(\left(\frac{-1}{2} - y\right) \cdot \log y + \color{blue}{y}\right) - z \]

      12. *-commutative N/A

          \[\leadsto \left(\log y \cdot \left(\frac{-1}{2} - y\right) + y\right) - z \]

      13. lower-fma.f64 71.5

          \[\leadsto \mathsf{fma}\left(\log y, \color{blue}{-0.5 - y}, y\right) - z \]

   6. Applied rewrites 71.5%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\log y, -0.5 - y, y\right)} - z \]

   7. Taylor expanded in y around 0

      \[\leadsto \frac{-1}{2} \cdot \color{blue}{\log y} - z \]
   8. Step-by-step derivation

      1. lower-*.f64 N/A

         \[\leadsto \frac{-1}{2} \cdot \log y - z \]

      2. lower-log.f64 43.1

         \[\leadsto -0.5 \cdot \log y - z \]

   9. Applied rewrites 43.1%

      \[\leadsto -0.5 \cdot \color{blue}{\log y} - z \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 5: 71.1% accurate, 1.3× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;y \leq 3.1 \cdot 10^{+159}:\\ \;\;\;\;\mathsf{fma}\left(1, x, y - z\right)\\ \mathbf{else}:\\ \;\;\;\;\left(1 - \log y\right) \cdot y\\ \end{array} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (if (<= y 3.1e+159) (fma 1.0 x (- y z)) (* (- 1.0 (log y)) y)))

C

double code(double x, double y, double z) {
	double tmp;
	if (y <= 3.1e+159) {
		tmp = fma(1.0, x, (y - z));
	} else {
		tmp = (1.0 - log(y)) * y;
	}
	return tmp;
}

Julia

function code(x, y, z)
	tmp = 0.0
	if (y <= 3.1e+159)
		tmp = fma(1.0, x, Float64(y - z));
	else
		tmp = Float64(Float64(1.0 - log(y)) * y);
	end
	return tmp
end

Wolfram

code[x_, y_, z_] := If[LessEqual[y, 3.1e+159], N[(1.0 * x + N[(y - z), $MachinePrecision]), $MachinePrecision], N[(N[(1.0 - N[Log[y], $MachinePrecision]), $MachinePrecision] * y), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if y < 3.0999999999999998e159

   1. Initial program 99.8%

      \[\left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \]
   2. Step-by-step derivation

      1. lift-+.f64 N/A

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

      2. lift--.f64 N/A

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

      3. sub-flip N/A

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

      4. associate-+l+ N/A

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

      5. lower-+.f64 N/A

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

      6. lift-*.f64 N/A

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

      7. distribute-lft-neg-out N/A

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

      8. lower-fma.f64 N/A

         \[\leadsto \left(x + \color{blue}{\mathsf{fma}\left(\mathsf{neg}\left(\left(y + \frac{1}{2}\right)\right), \log y, y\right)}\right) - z \]

      9. lift-+.f64 N/A

         \[\leadsto \left(x + \mathsf{fma}\left(\mathsf{neg}\left(\color{blue}{\left(y + \frac{1}{2}\right)}\right), \log y, y\right)\right) - z \]

      10. add-flip N/A

          \[\leadsto \left(x + \mathsf{fma}\left(\mathsf{neg}\left(\color{blue}{\left(y - \left(\mathsf{neg}\left(\frac{1}{2}\right)\right)\right)}\right), \log y, y\right)\right) - z \]

      11. sub-negate N/A

          \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{\left(\mathsf{neg}\left(\frac{1}{2}\right)\right) - y}, \log y, y\right)\right) - z \]

      12. lower--.f64 N/A

          \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{\left(\mathsf{neg}\left(\frac{1}{2}\right)\right) - y}, \log y, y\right)\right) - z \]

      13. metadata-eval 99.9

          \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{-0.5} - y, \log y, y\right)\right) - z \]

   3. Applied rewrites 99.9%

      \[\leadsto \color{blue}{\left(x + \mathsf{fma}\left(-0.5 - y, \log y, y\right)\right) - z} \]

   5. Applied rewrites 88.1%

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

   6. Taylor expanded in x around inf

      \[\leadsto \mathsf{fma}\left(\color{blue}{1}, x, y - z\right) \]
   7. Step-by-step derivation

   8. Applied rewrites 57.6%

      \[\leadsto \mathsf{fma}\left(\color{blue}{1}, x, y - z\right) \]

   if 3.0999999999999998e159 < y

   1. Initial program 99.8%

      \[\left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \]

   2. Taylor expanded in y around -inf

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

      1. lower-*.f64 N/A

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

      2. lower-+.f64 N/A

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

      3. lower-log.f64 N/A

         \[\leadsto y \cdot \left(1 + \log \left(\frac{1}{y}\right)\right) \]

      4. lower-/.f64 30.7

         \[\leadsto y \cdot \left(1 + \log \left(\frac{1}{y}\right)\right) \]

   4. Applied rewrites 30.7%

      \[\leadsto \color{blue}{y \cdot \left(1 + \log \left(\frac{1}{y}\right)\right)} \]
   5. Step-by-step derivation

      1. lift-*.f64 N/A

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

      2. *-commutative N/A

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

      3. lower-*.f64 30.7

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

      4. lift-+.f64 N/A

         \[\leadsto \left(1 + \log \left(\frac{1}{y}\right)\right) \cdot y \]

      5. lift-log.f64 N/A

         \[\leadsto \left(1 + \log \left(\frac{1}{y}\right)\right) \cdot y \]

      6. lift-/.f64 N/A

         \[\leadsto \left(1 + \log \left(\frac{1}{y}\right)\right) \cdot y \]

      7. log-rec N/A

         \[\leadsto \left(1 + \left(\mathsf{neg}\left(\log y\right)\right)\right) \cdot y \]

      8. lift-log.f64 N/A

         \[\leadsto \left(1 + \left(\mathsf{neg}\left(\log y\right)\right)\right) \cdot y \]

      9. sub-flip-reverse N/A

         \[\leadsto \left(1 - \log y\right) \cdot y \]

      10. lower--.f64 30.7

          \[\leadsto \left(1 - \log y\right) \cdot y \]

   6. Applied rewrites 30.7%

      \[\leadsto \color{blue}{\left(1 - \log y\right) \cdot y} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 6: 57.6% accurate, 2.4× speedup

Math

\[\begin{array}{l} \\ \mathsf{fma}\left(1, x, y - z\right) \end{array} \]

FPCore

(FPCore (x y z) :precision binary64 (fma 1.0 x (- y z)))

C

double code(double x, double y, double z) {
	return fma(1.0, x, (y - z));
}

Julia

function code(x, y, z)
	return fma(1.0, x, Float64(y - z))
end

Wolfram

code[x_, y_, z_] := N[(1.0 * x + N[(y - z), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.8%

   \[\left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \]
2. Step-by-step derivation

   1. lift-+.f64 N/A

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

   2. lift--.f64 N/A

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

   3. sub-flip N/A

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

   4. associate-+l+ N/A

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

   5. lower-+.f64 N/A

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

   6. lift-*.f64 N/A

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

   7. distribute-lft-neg-out N/A

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

   8. lower-fma.f64 N/A

      \[\leadsto \left(x + \color{blue}{\mathsf{fma}\left(\mathsf{neg}\left(\left(y + \frac{1}{2}\right)\right), \log y, y\right)}\right) - z \]

   9. lift-+.f64 N/A

      \[\leadsto \left(x + \mathsf{fma}\left(\mathsf{neg}\left(\color{blue}{\left(y + \frac{1}{2}\right)}\right), \log y, y\right)\right) - z \]

   10. add-flip N/A

       \[\leadsto \left(x + \mathsf{fma}\left(\mathsf{neg}\left(\color{blue}{\left(y - \left(\mathsf{neg}\left(\frac{1}{2}\right)\right)\right)}\right), \log y, y\right)\right) - z \]

   11. sub-negate N/A

       \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{\left(\mathsf{neg}\left(\frac{1}{2}\right)\right) - y}, \log y, y\right)\right) - z \]

   12. lower--.f64 N/A

       \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{\left(\mathsf{neg}\left(\frac{1}{2}\right)\right) - y}, \log y, y\right)\right) - z \]

   13. metadata-eval 99.9

       \[\leadsto \left(x + \mathsf{fma}\left(\color{blue}{-0.5} - y, \log y, y\right)\right) - z \]

3. Applied rewrites 99.9%

   \[\leadsto \color{blue}{\left(x + \mathsf{fma}\left(-0.5 - y, \log y, y\right)\right) - z} \]

5. Applied rewrites 88.1%

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

6. Taylor expanded in x around inf

   \[\leadsto \mathsf{fma}\left(\color{blue}{1}, x, y - z\right) \]
7. Step-by-step derivation

8. Applied rewrites 57.6%

   \[\leadsto \mathsf{fma}\left(\color{blue}{1}, x, y - z\right) \]
9. Add Preprocessing

Alternative 7: 30.8% accurate, 10.4× speedup

Math

\[\begin{array}{l} \\ -z \end{array} \]

FPCore

(FPCore (x y z) :precision binary64 (- z))

C

double code(double x, double y, double z) {
	return -z;
}

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, y, z)
use fmin_fmax_functions
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    code = -z
end function

Java

public static double code(double x, double y, double z) {
	return -z;
}

Python

def code(x, y, z):
	return -z

Julia

function code(x, y, z)
	return Float64(-z)
end

MATLAB

function tmp = code(x, y, z)
	tmp = -z;
end

Wolfram

code[x_, y_, z_] := (-z)

Derivation

1. Initial program 99.8%

   \[\left(\left(x - \left(y + 0.5\right) \cdot \log y\right) + y\right) - z \]

2. Taylor expanded in z around inf

   \[\leadsto \color{blue}{-1 \cdot z} \]
3. Step-by-step derivation

   1. lower-*.f64 30.8

      \[\leadsto -1 \cdot \color{blue}{z} \]

4. Applied rewrites 30.8%

   \[\leadsto \color{blue}{-1 \cdot z} \]
5. Step-by-step derivation

   1. lift-*.f64 N/A

      \[\leadsto -1 \cdot \color{blue}{z} \]

   2. mul-1-neg N/A

      \[\leadsto \mathsf{neg}\left(z\right) \]

   3. lower-neg.f64 30.8

      \[\leadsto -z \]

6. Applied rewrites 30.8%

   \[\leadsto \color{blue}{-z} \]
7. Add Preprocessing

Reproduce

herbie shell --seed 2025154 
(FPCore (x y z)
  :name "Numeric.SpecFunctions:stirlingError from math-functions-0.1.5.2"
  :precision binary64
  (- (+ (- x (* (+ y 0.5) (log y))) y) z))