1/2(abs(p)+abs(r) - sqrt((p-r)^2 + 4q^2))

Percentage Accurate: 24.5% → 52.4%

Time: 4.9s

Alternatives: 7

Speedup: 28.9×

Specification

Math

\[\begin{array}{l} \\ \frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \end{array} \]

FPCore

(FPCore (p r q)
 :precision binary64
 (*
  (/ 1.0 2.0)
  (- (+ (fabs p) (fabs r)) (sqrt (+ (pow (- p r) 2.0) (* 4.0 (pow q 2.0)))))))

C

double code(double p, double r, double q) {
	return (1.0 / 2.0) * ((fabs(p) + fabs(r)) - sqrt((pow((p - r), 2.0) + (4.0 * pow(q, 2.0)))));
}

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(p, r, q)
use fmin_fmax_functions
    real(8), intent (in) :: p
    real(8), intent (in) :: r
    real(8), intent (in) :: q
    code = (1.0d0 / 2.0d0) * ((abs(p) + abs(r)) - sqrt((((p - r) ** 2.0d0) + (4.0d0 * (q ** 2.0d0)))))
end function

Java

public static double code(double p, double r, double q) {
	return (1.0 / 2.0) * ((Math.abs(p) + Math.abs(r)) - Math.sqrt((Math.pow((p - r), 2.0) + (4.0 * Math.pow(q, 2.0)))));
}

Python

def code(p, r, q):
	return (1.0 / 2.0) * ((math.fabs(p) + math.fabs(r)) - math.sqrt((math.pow((p - r), 2.0) + (4.0 * math.pow(q, 2.0)))))

Julia

function code(p, r, q)
	return Float64(Float64(1.0 / 2.0) * Float64(Float64(abs(p) + abs(r)) - sqrt(Float64((Float64(p - r) ^ 2.0) + Float64(4.0 * (q ^ 2.0))))))
end

MATLAB

function tmp = code(p, r, q)
	tmp = (1.0 / 2.0) * ((abs(p) + abs(r)) - sqrt((((p - r) ^ 2.0) + (4.0 * (q ^ 2.0)))));
end

Wolfram

code[p_, r_, q_] := N[(N[(1.0 / 2.0), $MachinePrecision] * N[(N[(N[Abs[p], $MachinePrecision] + N[Abs[r], $MachinePrecision]), $MachinePrecision] - N[Sqrt[N[(N[Power[N[(p - r), $MachinePrecision], 2.0], $MachinePrecision] + N[(4.0 * N[Power[q, 2.0], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Initial Program: 24.5% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \end{array} \]

FPCore

(FPCore (p r q)
 :precision binary64
 (*
  (/ 1.0 2.0)
  (- (+ (fabs p) (fabs r)) (sqrt (+ (pow (- p r) 2.0) (* 4.0 (pow q 2.0)))))))

C

double code(double p, double r, double q) {
	return (1.0 / 2.0) * ((fabs(p) + fabs(r)) - sqrt((pow((p - r), 2.0) + (4.0 * pow(q, 2.0)))));
}

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(p, r, q)
use fmin_fmax_functions
    real(8), intent (in) :: p
    real(8), intent (in) :: r
    real(8), intent (in) :: q
    code = (1.0d0 / 2.0d0) * ((abs(p) + abs(r)) - sqrt((((p - r) ** 2.0d0) + (4.0d0 * (q ** 2.0d0)))))
end function

Java

public static double code(double p, double r, double q) {
	return (1.0 / 2.0) * ((Math.abs(p) + Math.abs(r)) - Math.sqrt((Math.pow((p - r), 2.0) + (4.0 * Math.pow(q, 2.0)))));
}

Python

def code(p, r, q):
	return (1.0 / 2.0) * ((math.fabs(p) + math.fabs(r)) - math.sqrt((math.pow((p - r), 2.0) + (4.0 * math.pow(q, 2.0)))))

Julia

function code(p, r, q)
	return Float64(Float64(1.0 / 2.0) * Float64(Float64(abs(p) + abs(r)) - sqrt(Float64((Float64(p - r) ^ 2.0) + Float64(4.0 * (q ^ 2.0))))))
end

MATLAB

function tmp = code(p, r, q)
	tmp = (1.0 / 2.0) * ((abs(p) + abs(r)) - sqrt((((p - r) ^ 2.0) + (4.0 * (q ^ 2.0)))));
end

Wolfram

code[p_, r_, q_] := N[(N[(1.0 / 2.0), $MachinePrecision] * N[(N[(N[Abs[p], $MachinePrecision] + N[Abs[r], $MachinePrecision]), $MachinePrecision] - N[Sqrt[N[(N[Power[N[(p - r), $MachinePrecision], 2.0], $MachinePrecision] + N[(4.0 * N[Power[q, 2.0], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]

Alternative 1: 52.4% accurate, 1.2× speedup

Math

\[\begin{array}{l} q_m = \left|q\right| \\ \begin{array}{l} \mathbf{if}\;q\_m \leq 2.65 \cdot 10^{-15}:\\ \;\;\;\;-1 \cdot \frac{{q\_m}^{2}}{\sqrt{{\left(p - r\right)}^{2}}}\\ \mathbf{else}:\\ \;\;\;\;-q\_m\\ \end{array} \end{array} \]

FPCore

q_m = (fabs.f64 q)
(FPCore (p r q_m)
 :precision binary64
 (if (<= q_m 2.65e-15)
   (* -1.0 (/ (pow q_m 2.0) (sqrt (pow (- p r) 2.0))))
   (- q_m)))

C

q_m = fabs(q);
double code(double p, double r, double q_m) {
	double tmp;
	if (q_m <= 2.65e-15) {
		tmp = -1.0 * (pow(q_m, 2.0) / sqrt(pow((p - r), 2.0)));
	} else {
		tmp = -q_m;
	}
	return tmp;
}

Fortran

q_m =     private
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(p, r, q_m)
use fmin_fmax_functions
    real(8), intent (in) :: p
    real(8), intent (in) :: r
    real(8), intent (in) :: q_m
    real(8) :: tmp
    if (q_m <= 2.65d-15) then
        tmp = (-1.0d0) * ((q_m ** 2.0d0) / sqrt(((p - r) ** 2.0d0)))
    else
        tmp = -q_m
    end if
    code = tmp
end function

Java

q_m = Math.abs(q);
public static double code(double p, double r, double q_m) {
	double tmp;
	if (q_m <= 2.65e-15) {
		tmp = -1.0 * (Math.pow(q_m, 2.0) / Math.sqrt(Math.pow((p - r), 2.0)));
	} else {
		tmp = -q_m;
	}
	return tmp;
}

Python

q_m = math.fabs(q)
def code(p, r, q_m):
	tmp = 0
	if q_m <= 2.65e-15:
		tmp = -1.0 * (math.pow(q_m, 2.0) / math.sqrt(math.pow((p - r), 2.0)))
	else:
		tmp = -q_m
	return tmp

Julia

q_m = abs(q)
function code(p, r, q_m)
	tmp = 0.0
	if (q_m <= 2.65e-15)
		tmp = Float64(-1.0 * Float64((q_m ^ 2.0) / sqrt((Float64(p - r) ^ 2.0))));
	else
		tmp = Float64(-q_m);
	end
	return tmp
end

MATLAB

q_m = abs(q);
function tmp_2 = code(p, r, q_m)
	tmp = 0.0;
	if (q_m <= 2.65e-15)
		tmp = -1.0 * ((q_m ^ 2.0) / sqrt(((p - r) ^ 2.0)));
	else
		tmp = -q_m;
	end
	tmp_2 = tmp;
end

Wolfram

q_m = N[Abs[q], $MachinePrecision]
code[p_, r_, q$95$m_] := If[LessEqual[q$95$m, 2.65e-15], N[(-1.0 * N[(N[Power[q$95$m, 2.0], $MachinePrecision] / N[Sqrt[N[Power[N[(p - r), $MachinePrecision], 2.0], $MachinePrecision]], $MachinePrecision]), $MachinePrecision]), $MachinePrecision], (-q$95$m)]

Derivation

1. Split input into 2 regimes

2. if q < 2.6500000000000001e-15

   1. Initial program 24.5%

      \[\frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \]

   2. Taylor expanded in q around 0

      \[\leadsto \color{blue}{-1 \cdot \frac{{q}^{2}}{\sqrt{{\left(p - r\right)}^{2}}} + \frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2}}\right)} \]

   4. Applied rewrites 18.7%

      \[\leadsto \color{blue}{\mathsf{fma}\left(-1, \frac{{q}^{2}}{\sqrt{{\left(p - r\right)}^{2}}}, 0.5 \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2}}\right)\right)} \]

   5. Taylor expanded in q around inf

      \[\leadsto -1 \cdot \color{blue}{\frac{{q}^{2}}{\sqrt{{\left(p - r\right)}^{2}}}} \]

   7. Applied rewrites 28.0%

      \[\leadsto -1 \cdot \color{blue}{\frac{{q}^{2}}{\sqrt{{\left(p - r\right)}^{2}}}} \]

   if 2.6500000000000001e-15 < q

   1. Initial program 24.5%

      \[\frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \]

   2. Taylor expanded in q around inf

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

   4. Applied rewrites 36.0%

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

   6. Applied rewrites 36.0%

      \[\leadsto \color{blue}{-q} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 2: 50.6% accurate, 1.2× speedup

Math

\[\begin{array}{l} q_m = \left|q\right| \\ \begin{array}{l} \mathbf{if}\;q\_m \leq 6.5 \cdot 10^{-16}:\\ \;\;\;\;\mathsf{fma}\left(-1, \frac{{q\_m}^{2}}{r \cdot \left(1 + -1 \cdot \frac{p}{r}\right)}, 1 \cdot \left(p - p\right)\right)\\ \mathbf{else}:\\ \;\;\;\;-q\_m\\ \end{array} \end{array} \]

FPCore

q_m = (fabs.f64 q)
(FPCore (p r q_m)
 :precision binary64
 (if (<= q_m 6.5e-16)
   (fma -1.0 (/ (pow q_m 2.0) (* r (+ 1.0 (* -1.0 (/ p r))))) (* 1.0 (- p p)))
   (- q_m)))

C

q_m = fabs(q);
double code(double p, double r, double q_m) {
	double tmp;
	if (q_m <= 6.5e-16) {
		tmp = fma(-1.0, (pow(q_m, 2.0) / (r * (1.0 + (-1.0 * (p / r))))), (1.0 * (p - p)));
	} else {
		tmp = -q_m;
	}
	return tmp;
}

Julia

q_m = abs(q)
function code(p, r, q_m)
	tmp = 0.0
	if (q_m <= 6.5e-16)
		tmp = fma(-1.0, Float64((q_m ^ 2.0) / Float64(r * Float64(1.0 + Float64(-1.0 * Float64(p / r))))), Float64(1.0 * Float64(p - p)));
	else
		tmp = Float64(-q_m);
	end
	return tmp
end

Wolfram

q_m = N[Abs[q], $MachinePrecision]
code[p_, r_, q$95$m_] := If[LessEqual[q$95$m, 6.5e-16], N[(-1.0 * N[(N[Power[q$95$m, 2.0], $MachinePrecision] / N[(r * N[(1.0 + N[(-1.0 * N[(p / r), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] + N[(1.0 * N[(p - p), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], (-q$95$m)]

Derivation

1. Split input into 2 regimes

2. if q < 6.50000000000000011e-16

   1. Initial program 24.5%

      \[\frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \]

   2. Taylor expanded in q around 0

      \[\leadsto \color{blue}{-1 \cdot \frac{{q}^{2}}{\sqrt{{\left(p - r\right)}^{2}}} + \frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2}}\right)} \]

   4. Applied rewrites 18.7%

      \[\leadsto \color{blue}{\mathsf{fma}\left(-1, \frac{{q}^{2}}{\sqrt{{\left(p - r\right)}^{2}}}, 0.5 \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2}}\right)\right)} \]

   5. Taylor expanded in r around inf

      \[\leadsto \mathsf{fma}\left(-1, \frac{{q}^{2}}{r \cdot \color{blue}{\left(1 + -1 \cdot \frac{p}{r}\right)}}, \frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2}}\right)\right) \]

   7. Applied rewrites 13.6%

      \[\leadsto \mathsf{fma}\left(-1, \frac{{q}^{2}}{r \cdot \color{blue}{\left(1 + -1 \cdot \frac{p}{r}\right)}}, 0.5 \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2}}\right)\right) \]

   8. Taylor expanded in r around inf

      \[\leadsto \mathsf{fma}\left(-1, \frac{{q}^{2}}{r \cdot \left(1 + -1 \cdot \frac{p}{r}\right)}, \frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - r \cdot \left(1 + -1 \cdot \frac{p}{r}\right)\right)\right) \]

   10. Applied rewrites 16.5%

       \[\leadsto \mathsf{fma}\left(-1, \frac{{q}^{2}}{r \cdot \left(1 + -1 \cdot \frac{p}{r}\right)}, 0.5 \cdot \left(\left(\left|p\right| + \left|r\right|\right) - r \cdot \left(1 + -1 \cdot \frac{p}{r}\right)\right)\right) \]

   12. Applied rewrites 26.6%

       \[\leadsto \mathsf{fma}\left(-1, \frac{{q}^{2}}{r \cdot \left(1 + -1 \cdot \frac{p}{r}\right)}, 1 \cdot \left(p - p\right)\right) \]

   if 6.50000000000000011e-16 < q

   1. Initial program 24.5%

      \[\frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \]

   2. Taylor expanded in q around inf

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

   4. Applied rewrites 36.0%

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

   6. Applied rewrites 36.0%

      \[\leadsto \color{blue}{-q} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 3: 48.4% accurate, 2.8× speedup

Math

\[\begin{array}{l} q_m = \left|q\right| \\ \begin{array}{l} \mathbf{if}\;q\_m \leq 8.5 \cdot 10^{-77}:\\ \;\;\;\;\left(\left(p - r\right) - \mathsf{fma}\left(q\_m, 4, p - r\right)\right) \cdot 1\\ \mathbf{else}:\\ \;\;\;\;0.5 \cdot \left(\left(\left|p\right| + \left|r\right|\right) - 2 \cdot q\_m\right)\\ \end{array} \end{array} \]

FPCore

q_m = (fabs.f64 q)
(FPCore (p r q_m)
 :precision binary64
 (if (<= q_m 8.5e-77)
   (* (- (- p r) (fma q_m 4.0 (- p r))) 1.0)
   (* 0.5 (- (+ (fabs p) (fabs r)) (* 2.0 q_m)))))

C

q_m = fabs(q);
double code(double p, double r, double q_m) {
	double tmp;
	if (q_m <= 8.5e-77) {
		tmp = ((p - r) - fma(q_m, 4.0, (p - r))) * 1.0;
	} else {
		tmp = 0.5 * ((fabs(p) + fabs(r)) - (2.0 * q_m));
	}
	return tmp;
}

Julia

q_m = abs(q)
function code(p, r, q_m)
	tmp = 0.0
	if (q_m <= 8.5e-77)
		tmp = Float64(Float64(Float64(p - r) - fma(q_m, 4.0, Float64(p - r))) * 1.0);
	else
		tmp = Float64(0.5 * Float64(Float64(abs(p) + abs(r)) - Float64(2.0 * q_m)));
	end
	return tmp
end

Wolfram

q_m = N[Abs[q], $MachinePrecision]
code[p_, r_, q$95$m_] := If[LessEqual[q$95$m, 8.5e-77], N[(N[(N[(p - r), $MachinePrecision] - N[(q$95$m * 4.0 + N[(p - r), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] * 1.0), $MachinePrecision], N[(0.5 * N[(N[(N[Abs[p], $MachinePrecision] + N[Abs[r], $MachinePrecision]), $MachinePrecision] - N[(2.0 * q$95$m), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if q < 8.4999999999999998e-77

   1. Initial program 24.5%

      \[\frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \]

   3. Applied rewrites 24.2%

      \[\leadsto \color{blue}{\left(\left(p - r\right) - \mathsf{fma}\left(q, 4, p - r\right)\right) \cdot 1} \]

   if 8.4999999999999998e-77 < q

   1. Initial program 24.5%

      \[\frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \]

   2. Taylor expanded in q around inf

      \[\leadsto \frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \color{blue}{2 \cdot q}\right) \]

   4. Applied rewrites 35.3%

      \[\leadsto \frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \color{blue}{2 \cdot q}\right) \]

   6. Applied rewrites 35.3%

      \[\leadsto \color{blue}{0.5} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - 2 \cdot q\right) \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 4: 48.2% accurate, 3.1× speedup

Math

\[\begin{array}{l} q_m = \left|q\right| \\ \begin{array}{l} \mathbf{if}\;q\_m \leq 8.5 \cdot 10^{-77}:\\ \;\;\;\;0.5 \cdot 0\\ \mathbf{else}:\\ \;\;\;\;0.5 \cdot \left(\left(\left|p\right| + \left|r\right|\right) - 2 \cdot q\_m\right)\\ \end{array} \end{array} \]

FPCore

q_m = (fabs.f64 q)
(FPCore (p r q_m)
 :precision binary64
 (if (<= q_m 8.5e-77)
   (* 0.5 0.0)
   (* 0.5 (- (+ (fabs p) (fabs r)) (* 2.0 q_m)))))

C

q_m = fabs(q);
double code(double p, double r, double q_m) {
	double tmp;
	if (q_m <= 8.5e-77) {
		tmp = 0.5 * 0.0;
	} else {
		tmp = 0.5 * ((fabs(p) + fabs(r)) - (2.0 * q_m));
	}
	return tmp;
}

Fortran

q_m =     private
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(p, r, q_m)
use fmin_fmax_functions
    real(8), intent (in) :: p
    real(8), intent (in) :: r
    real(8), intent (in) :: q_m
    real(8) :: tmp
    if (q_m <= 8.5d-77) then
        tmp = 0.5d0 * 0.0d0
    else
        tmp = 0.5d0 * ((abs(p) + abs(r)) - (2.0d0 * q_m))
    end if
    code = tmp
end function

Java

q_m = Math.abs(q);
public static double code(double p, double r, double q_m) {
	double tmp;
	if (q_m <= 8.5e-77) {
		tmp = 0.5 * 0.0;
	} else {
		tmp = 0.5 * ((Math.abs(p) + Math.abs(r)) - (2.0 * q_m));
	}
	return tmp;
}

Python

q_m = math.fabs(q)
def code(p, r, q_m):
	tmp = 0
	if q_m <= 8.5e-77:
		tmp = 0.5 * 0.0
	else:
		tmp = 0.5 * ((math.fabs(p) + math.fabs(r)) - (2.0 * q_m))
	return tmp

Julia

q_m = abs(q)
function code(p, r, q_m)
	tmp = 0.0
	if (q_m <= 8.5e-77)
		tmp = Float64(0.5 * 0.0);
	else
		tmp = Float64(0.5 * Float64(Float64(abs(p) + abs(r)) - Float64(2.0 * q_m)));
	end
	return tmp
end

MATLAB

q_m = abs(q);
function tmp_2 = code(p, r, q_m)
	tmp = 0.0;
	if (q_m <= 8.5e-77)
		tmp = 0.5 * 0.0;
	else
		tmp = 0.5 * ((abs(p) + abs(r)) - (2.0 * q_m));
	end
	tmp_2 = tmp;
end

Wolfram

q_m = N[Abs[q], $MachinePrecision]
code[p_, r_, q$95$m_] := If[LessEqual[q$95$m, 8.5e-77], N[(0.5 * 0.0), $MachinePrecision], N[(0.5 * N[(N[(N[Abs[p], $MachinePrecision] + N[Abs[r], $MachinePrecision]), $MachinePrecision] - N[(2.0 * q$95$m), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if q < 8.4999999999999998e-77

   1. Initial program 24.5%

      \[\frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \]

   2. Taylor expanded in p around -inf

      \[\leadsto \color{blue}{\frac{1}{2} \cdot p} \]

   4. Applied rewrites 4.2%

      \[\leadsto \color{blue}{0.5 \cdot p} \]

   6. Applied rewrites 19.0%

      \[\leadsto 0.5 \cdot 0 \]

   if 8.4999999999999998e-77 < q

   1. Initial program 24.5%

      \[\frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \]

   2. Taylor expanded in q around inf

      \[\leadsto \frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \color{blue}{2 \cdot q}\right) \]

   4. Applied rewrites 35.3%

      \[\leadsto \frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \color{blue}{2 \cdot q}\right) \]

   6. Applied rewrites 35.3%

      \[\leadsto \color{blue}{0.5} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - 2 \cdot q\right) \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 5: 48.2% accurate, 2.1× speedup

Math

\[\begin{array}{l} q_m = \left|q\right| \\ \begin{array}{l} \mathbf{if}\;4 \cdot {q\_m}^{2} \leq 5 \cdot 10^{-183}:\\ \;\;\;\;0.5 \cdot 0\\ \mathbf{else}:\\ \;\;\;\;-q\_m\\ \end{array} \end{array} \]

FPCore

q_m = (fabs.f64 q)
(FPCore (p r q_m)
 :precision binary64
 (if (<= (* 4.0 (pow q_m 2.0)) 5e-183) (* 0.5 0.0) (- q_m)))

C

q_m = fabs(q);
double code(double p, double r, double q_m) {
	double tmp;
	if ((4.0 * pow(q_m, 2.0)) <= 5e-183) {
		tmp = 0.5 * 0.0;
	} else {
		tmp = -q_m;
	}
	return tmp;
}

Fortran

q_m =     private
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(p, r, q_m)
use fmin_fmax_functions
    real(8), intent (in) :: p
    real(8), intent (in) :: r
    real(8), intent (in) :: q_m
    real(8) :: tmp
    if ((4.0d0 * (q_m ** 2.0d0)) <= 5d-183) then
        tmp = 0.5d0 * 0.0d0
    else
        tmp = -q_m
    end if
    code = tmp
end function

Java

q_m = Math.abs(q);
public static double code(double p, double r, double q_m) {
	double tmp;
	if ((4.0 * Math.pow(q_m, 2.0)) <= 5e-183) {
		tmp = 0.5 * 0.0;
	} else {
		tmp = -q_m;
	}
	return tmp;
}

Python

q_m = math.fabs(q)
def code(p, r, q_m):
	tmp = 0
	if (4.0 * math.pow(q_m, 2.0)) <= 5e-183:
		tmp = 0.5 * 0.0
	else:
		tmp = -q_m
	return tmp

Julia

q_m = abs(q)
function code(p, r, q_m)
	tmp = 0.0
	if (Float64(4.0 * (q_m ^ 2.0)) <= 5e-183)
		tmp = Float64(0.5 * 0.0);
	else
		tmp = Float64(-q_m);
	end
	return tmp
end

MATLAB

q_m = abs(q);
function tmp_2 = code(p, r, q_m)
	tmp = 0.0;
	if ((4.0 * (q_m ^ 2.0)) <= 5e-183)
		tmp = 0.5 * 0.0;
	else
		tmp = -q_m;
	end
	tmp_2 = tmp;
end

Wolfram

q_m = N[Abs[q], $MachinePrecision]
code[p_, r_, q$95$m_] := If[LessEqual[N[(4.0 * N[Power[q$95$m, 2.0], $MachinePrecision]), $MachinePrecision], 5e-183], N[(0.5 * 0.0), $MachinePrecision], (-q$95$m)]

Derivation

1. Split input into 2 regimes

2. if (*.f64 #s(literal 4 binary64) (pow.f64 q #s(literal 2 binary64))) < 5.0000000000000002e-183

   1. Initial program 24.5%

      \[\frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \]

   2. Taylor expanded in p around -inf

      \[\leadsto \color{blue}{\frac{1}{2} \cdot p} \]

   4. Applied rewrites 4.2%

      \[\leadsto \color{blue}{0.5 \cdot p} \]

   6. Applied rewrites 19.0%

      \[\leadsto 0.5 \cdot 0 \]

   if 5.0000000000000002e-183 < (*.f64 #s(literal 4 binary64) (pow.f64 q #s(literal 2 binary64)))

   1. Initial program 24.5%

      \[\frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \]

   2. Taylor expanded in q around inf

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

   4. Applied rewrites 36.0%

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

   6. Applied rewrites 36.0%

      \[\leadsto \color{blue}{-q} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 6: 36.0% accurate, 28.9× speedup

Math

\[\begin{array}{l} q_m = \left|q\right| \\ -q\_m \end{array} \]

FPCore

q_m = (fabs.f64 q)
(FPCore (p r q_m) :precision binary64 (- q_m))

C

q_m = fabs(q);
double code(double p, double r, double q_m) {
	return -q_m;
}

Fortran

q_m =     private
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(p, r, q_m)
use fmin_fmax_functions
    real(8), intent (in) :: p
    real(8), intent (in) :: r
    real(8), intent (in) :: q_m
    code = -q_m
end function

Java

q_m = Math.abs(q);
public static double code(double p, double r, double q_m) {
	return -q_m;
}

Python

q_m = math.fabs(q)
def code(p, r, q_m):
	return -q_m

Julia

q_m = abs(q)
function code(p, r, q_m)
	return Float64(-q_m)
end

MATLAB

q_m = abs(q);
function tmp = code(p, r, q_m)
	tmp = -q_m;
end

Wolfram

q_m = N[Abs[q], $MachinePrecision]
code[p_, r_, q$95$m_] := (-q$95$m)

Derivation

1. Initial program 24.5%

   \[\frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \]

2. Taylor expanded in q around inf

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

4. Applied rewrites 36.0%

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

6. Applied rewrites 36.0%

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

Alternative 7: 3.3% accurate, 56.8× speedup

Math

\[\begin{array}{l} q_m = \left|q\right| \\ q\_m \end{array} \]

FPCore

q_m = (fabs.f64 q)
(FPCore (p r q_m) :precision binary64 q_m)

C

q_m = fabs(q);
double code(double p, double r, double q_m) {
	return q_m;
}

Fortran

q_m =     private
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(p, r, q_m)
use fmin_fmax_functions
    real(8), intent (in) :: p
    real(8), intent (in) :: r
    real(8), intent (in) :: q_m
    code = q_m
end function

Java

q_m = Math.abs(q);
public static double code(double p, double r, double q_m) {
	return q_m;
}

Python

q_m = math.fabs(q)
def code(p, r, q_m):
	return q_m

Julia

q_m = abs(q)
function code(p, r, q_m)
	return q_m
end

MATLAB

q_m = abs(q);
function tmp = code(p, r, q_m)
	tmp = q_m;
end

Wolfram

q_m = N[Abs[q], $MachinePrecision]
code[p_, r_, q$95$m_] := q$95$m

Derivation

1. Initial program 24.5%

   \[\frac{1}{2} \cdot \left(\left(\left|p\right| + \left|r\right|\right) - \sqrt{{\left(p - r\right)}^{2} + 4 \cdot {q}^{2}}\right) \]

2. Taylor expanded in q around inf

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

4. Applied rewrites 36.0%

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

6. Applied rewrites 36.0%

   \[\leadsto \color{blue}{-q} \]

8. Applied rewrites 3.3%

   \[\leadsto q \]
9. Add Preprocessing

Reproduce

herbie shell --seed 2025159 
(FPCore (p r q)
  :name "1/2(abs(p)+abs(r) - sqrt((p-r)^2 + 4q^2))"
  :precision binary64
  (* (/ 1.0 2.0) (- (+ (fabs p) (fabs r)) (sqrt (+ (pow (- p r) 2.0) (* 4.0 (pow q 2.0)))))))