Quadratic roots, full range

Percentage Accurate: 52.3% → 85.6%

Time: 3.6s

Alternatives: 8

Speedup: 2.7×

Specification

Math

\[\begin{array}{l} \\ \frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \end{array} \]

FPCore

(FPCore (a b c)
 :precision binary64
 (/ (+ (- b) (sqrt (- (* b b) (* (* 4.0 a) c)))) (* 2.0 a)))

C

double code(double a, double b, double c) {
	return (-b + sqrt(((b * b) - ((4.0 * a) * c)))) / (2.0 * a);
}

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(a, b, c)
use fmin_fmax_functions
    real(8), intent (in) :: a
    real(8), intent (in) :: b
    real(8), intent (in) :: c
    code = (-b + sqrt(((b * b) - ((4.0d0 * a) * c)))) / (2.0d0 * a)
end function

Java

public static double code(double a, double b, double c) {
	return (-b + Math.sqrt(((b * b) - ((4.0 * a) * c)))) / (2.0 * a);
}

Python

def code(a, b, c):
	return (-b + math.sqrt(((b * b) - ((4.0 * a) * c)))) / (2.0 * a)

Julia

function code(a, b, c)
	return Float64(Float64(Float64(-b) + sqrt(Float64(Float64(b * b) - Float64(Float64(4.0 * a) * c)))) / Float64(2.0 * a))
end

MATLAB

function tmp = code(a, b, c)
	tmp = (-b + sqrt(((b * b) - ((4.0 * a) * c)))) / (2.0 * a);
end

Wolfram

code[a_, b_, c_] := N[(N[((-b) + N[Sqrt[N[(N[(b * b), $MachinePrecision] - N[(N[(4.0 * a), $MachinePrecision] * c), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] / N[(2.0 * a), $MachinePrecision]), $MachinePrecision]

Initial Program: 52.3% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \end{array} \]

FPCore

(FPCore (a b c)
 :precision binary64
 (/ (+ (- b) (sqrt (- (* b b) (* (* 4.0 a) c)))) (* 2.0 a)))

C

double code(double a, double b, double c) {
	return (-b + sqrt(((b * b) - ((4.0 * a) * c)))) / (2.0 * a);
}

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(a, b, c)
use fmin_fmax_functions
    real(8), intent (in) :: a
    real(8), intent (in) :: b
    real(8), intent (in) :: c
    code = (-b + sqrt(((b * b) - ((4.0d0 * a) * c)))) / (2.0d0 * a)
end function

Java

public static double code(double a, double b, double c) {
	return (-b + Math.sqrt(((b * b) - ((4.0 * a) * c)))) / (2.0 * a);
}

Python

def code(a, b, c):
	return (-b + math.sqrt(((b * b) - ((4.0 * a) * c)))) / (2.0 * a)

Julia

function code(a, b, c)
	return Float64(Float64(Float64(-b) + sqrt(Float64(Float64(b * b) - Float64(Float64(4.0 * a) * c)))) / Float64(2.0 * a))
end

MATLAB

function tmp = code(a, b, c)
	tmp = (-b + sqrt(((b * b) - ((4.0 * a) * c)))) / (2.0 * a);
end

Wolfram

code[a_, b_, c_] := N[(N[((-b) + N[Sqrt[N[(N[(b * b), $MachinePrecision] - N[(N[(4.0 * a), $MachinePrecision] * c), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] / N[(2.0 * a), $MachinePrecision]), $MachinePrecision]

Alternative 1: 85.6% accurate, 0.8× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;b \leq -3.6 \cdot 10^{+129}:\\ \;\;\;\;\frac{-b}{a}\\ \mathbf{elif}\;b \leq 0.00016:\\ \;\;\;\;\frac{\sqrt{\mathsf{fma}\left(-4 \cdot a, c, b \cdot b\right)} + \left(-b\right)}{a + a}\\ \mathbf{else}:\\ \;\;\;\;\frac{-c}{b}\\ \end{array} \end{array} \]

FPCore

(FPCore (a b c)
 :precision binary64
 (if (<= b -3.6e+129)
   (/ (- b) a)
   (if (<= b 0.00016)
     (/ (+ (sqrt (fma (* -4.0 a) c (* b b))) (- b)) (+ a a))
     (/ (- c) b))))

C

double code(double a, double b, double c) {
	double tmp;
	if (b <= -3.6e+129) {
		tmp = -b / a;
	} else if (b <= 0.00016) {
		tmp = (sqrt(fma((-4.0 * a), c, (b * b))) + -b) / (a + a);
	} else {
		tmp = -c / b;
	}
	return tmp;
}

Julia

function code(a, b, c)
	tmp = 0.0
	if (b <= -3.6e+129)
		tmp = Float64(Float64(-b) / a);
	elseif (b <= 0.00016)
		tmp = Float64(Float64(sqrt(fma(Float64(-4.0 * a), c, Float64(b * b))) + Float64(-b)) / Float64(a + a));
	else
		tmp = Float64(Float64(-c) / b);
	end
	return tmp
end

Wolfram

code[a_, b_, c_] := If[LessEqual[b, -3.6e+129], N[((-b) / a), $MachinePrecision], If[LessEqual[b, 0.00016], N[(N[(N[Sqrt[N[(N[(-4.0 * a), $MachinePrecision] * c + N[(b * b), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] + (-b)), $MachinePrecision] / N[(a + a), $MachinePrecision]), $MachinePrecision], N[((-c) / b), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if b < -3.6000000000000001e129

   1. Initial program 47.7%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in b around -inf

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

      1. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot b}{\color{blue}{a}} \]

      2. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(b\right)}{a} \]

      3. lift-neg.f64 N/A

         \[\leadsto \frac{-b}{a} \]

      4. lower-/.f64 97.6

         \[\leadsto \frac{-b}{\color{blue}{a}} \]

   4. Applied rewrites 97.6%

      \[\leadsto \color{blue}{\frac{-b}{a}} \]

   if -3.6000000000000001e129 < b < 1.60000000000000013e-4

   1. Initial program 77.8%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]
   2. Step-by-step derivation

   3. Applied rewrites 77.8%

      \[\leadsto \color{blue}{\frac{\sqrt{\mathsf{fma}\left(-4 \cdot a, c, b \cdot b\right)} + \left(-b\right)}{a + a}} \]

   if 1.60000000000000013e-4 < b

   1. Initial program 14.0%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in a around 0

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

      1. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot c}{\color{blue}{b}} \]

      2. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(c\right)}{b} \]

      3. lower-/.f64 N/A

         \[\leadsto \frac{\mathsf{neg}\left(c\right)}{\color{blue}{b}} \]

      4. lower-neg.f64 91.1

         \[\leadsto \frac{-c}{b} \]

   4. Applied rewrites 91.1%

      \[\leadsto \color{blue}{\frac{-c}{b}} \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 2: 79.6% accurate, 1.2× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;b \leq -5.3 \cdot 10^{-17}:\\ \;\;\;\;\frac{-b}{a} + \frac{c}{b}\\ \mathbf{elif}\;b \leq 0.00016:\\ \;\;\;\;\left(-c\right) \cdot \sqrt{\frac{\frac{-1}{a}}{c}}\\ \mathbf{else}:\\ \;\;\;\;\frac{-c}{b}\\ \end{array} \end{array} \]

FPCore

(FPCore (a b c)
 :precision binary64
 (if (<= b -5.3e-17)
   (+ (/ (- b) a) (/ c b))
   (if (<= b 0.00016) (* (- c) (sqrt (/ (/ -1.0 a) c))) (/ (- c) b))))

C

double code(double a, double b, double c) {
	double tmp;
	if (b <= -5.3e-17) {
		tmp = (-b / a) + (c / b);
	} else if (b <= 0.00016) {
		tmp = -c * sqrt(((-1.0 / a) / c));
	} else {
		tmp = -c / b;
	}
	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(a, b, c)
use fmin_fmax_functions
    real(8), intent (in) :: a
    real(8), intent (in) :: b
    real(8), intent (in) :: c
    real(8) :: tmp
    if (b <= (-5.3d-17)) then
        tmp = (-b / a) + (c / b)
    else if (b <= 0.00016d0) then
        tmp = -c * sqrt((((-1.0d0) / a) / c))
    else
        tmp = -c / b
    end if
    code = tmp
end function

Java

public static double code(double a, double b, double c) {
	double tmp;
	if (b <= -5.3e-17) {
		tmp = (-b / a) + (c / b);
	} else if (b <= 0.00016) {
		tmp = -c * Math.sqrt(((-1.0 / a) / c));
	} else {
		tmp = -c / b;
	}
	return tmp;
}

Python

def code(a, b, c):
	tmp = 0
	if b <= -5.3e-17:
		tmp = (-b / a) + (c / b)
	elif b <= 0.00016:
		tmp = -c * math.sqrt(((-1.0 / a) / c))
	else:
		tmp = -c / b
	return tmp

Julia

function code(a, b, c)
	tmp = 0.0
	if (b <= -5.3e-17)
		tmp = Float64(Float64(Float64(-b) / a) + Float64(c / b));
	elseif (b <= 0.00016)
		tmp = Float64(Float64(-c) * sqrt(Float64(Float64(-1.0 / a) / c)));
	else
		tmp = Float64(Float64(-c) / b);
	end
	return tmp
end

MATLAB

function tmp_2 = code(a, b, c)
	tmp = 0.0;
	if (b <= -5.3e-17)
		tmp = (-b / a) + (c / b);
	elseif (b <= 0.00016)
		tmp = -c * sqrt(((-1.0 / a) / c));
	else
		tmp = -c / b;
	end
	tmp_2 = tmp;
end

Wolfram

code[a_, b_, c_] := If[LessEqual[b, -5.3e-17], N[(N[((-b) / a), $MachinePrecision] + N[(c / b), $MachinePrecision]), $MachinePrecision], If[LessEqual[b, 0.00016], N[((-c) * N[Sqrt[N[(N[(-1.0 / a), $MachinePrecision] / c), $MachinePrecision]], $MachinePrecision]), $MachinePrecision], N[((-c) / b), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if b < -5.2999999999999998e-17

   1. Initial program 66.6%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]
   2. Step-by-step derivation

   3. Applied rewrites 66.7%

      \[\leadsto \color{blue}{\frac{\sqrt{\mathsf{fma}\left(-4 \cdot a, c, b \cdot b\right)} + \left(-b\right)}{a + a}} \]

   4. Taylor expanded in b around -inf

      \[\leadsto \color{blue}{-1 \cdot \left(b \cdot \left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)\right)} \]
   5. Step-by-step derivation

      1. associate-*r* N/A

         \[\leadsto \left(-1 \cdot b\right) \cdot \color{blue}{\left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)} \]

      2. mul-1-neg N/A

         \[\leadsto \left(\mathsf{neg}\left(b\right)\right) \cdot \left(\color{blue}{-1 \cdot \frac{c}{{b}^{2}}} + \frac{1}{a}\right) \]

      3. lift-neg.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(\color{blue}{-1 \cdot \frac{c}{{b}^{2}}} + \frac{1}{a}\right) \]

      4. lower-*.f64 N/A

         \[\leadsto \left(-b\right) \cdot \color{blue}{\left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)} \]

      5. lower-+.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(-1 \cdot \frac{c}{{b}^{2}} + \color{blue}{\frac{1}{a}}\right) \]

      6. associate-*r/ N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{-1 \cdot c}{{b}^{2}} + \frac{\color{blue}{1}}{a}\right) \]

      7. mul-1-neg N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{\mathsf{neg}\left(c\right)}{{b}^{2}} + \frac{1}{a}\right) \]

      8. lift-neg.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{{b}^{2}} + \frac{1}{a}\right) \]

      9. lower-/.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{{b}^{2}} + \frac{\color{blue}{1}}{a}\right) \]

      10. pow2 N/A

          \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right) \]

      11. lift-*.f64 N/A

          \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right) \]

      12. lower-/.f64 90.6

          \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{\color{blue}{a}}\right) \]

   6. Applied rewrites 90.6%

      \[\leadsto \color{blue}{\left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right)} \]

   7. Taylor expanded in a around inf

      \[\leadsto -1 \cdot \frac{b}{a} + \color{blue}{\frac{c}{b}} \]
   8. Step-by-step derivation

      1. lower-+.f64 N/A

         \[\leadsto -1 \cdot \frac{b}{a} + \frac{c}{\color{blue}{b}} \]

      2. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot b}{a} + \frac{c}{b} \]

      3. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(b\right)}{a} + \frac{c}{b} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\mathsf{neg}\left(b\right)}{a} + \frac{c}{b} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{-b}{a} + \frac{c}{b} \]

      6. lower-/.f64 90.9

         \[\leadsto \frac{-b}{a} + \frac{c}{b} \]

   9. Applied rewrites 90.9%

      \[\leadsto \frac{-b}{a} + \color{blue}{\frac{c}{b}} \]

   if -5.2999999999999998e-17 < b < 1.60000000000000013e-4

   1. Initial program 72.2%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in c around -inf

      \[\leadsto \color{blue}{-1 \cdot \left(c \cdot \left(\frac{1}{2} \cdot \frac{b}{a \cdot c} + \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right)\right)} \]
   3. Step-by-step derivation

      1. associate-*r* N/A

         \[\leadsto \left(-1 \cdot c\right) \cdot \color{blue}{\left(\frac{1}{2} \cdot \frac{b}{a \cdot c} + \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right)} \]

      2. mul-1-neg N/A

         \[\leadsto \left(\mathsf{neg}\left(c\right)\right) \cdot \left(\color{blue}{\frac{1}{2} \cdot \frac{b}{a \cdot c}} + \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right) \]

      3. lower-*.f64 N/A

         \[\leadsto \left(\mathsf{neg}\left(c\right)\right) \cdot \color{blue}{\left(\frac{1}{2} \cdot \frac{b}{a \cdot c} + \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right)} \]

      4. lower-neg.f64 N/A

         \[\leadsto \left(-c\right) \cdot \left(\color{blue}{\frac{1}{2} \cdot \frac{b}{a \cdot c}} + \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right) \]

      5. *-commutative N/A

         \[\leadsto \left(-c\right) \cdot \left(\frac{b}{a \cdot c} \cdot \frac{1}{2} + \color{blue}{\sqrt{\frac{1}{a \cdot c}}} \cdot \sqrt{-1}\right) \]

      6. lower-fma.f64 N/A

         \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{a \cdot c}, \color{blue}{\frac{1}{2}}, \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right) \]

      7. lower-/.f64 N/A

         \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{a \cdot c}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right) \]

      8. *-commutative N/A

         \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right) \]

      9. lower-*.f64 N/A

         \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right) \]

      10. sqrt-unprod N/A

          \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c} \cdot -1}\right) \]

      11. lower-sqrt.f64 N/A

          \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c} \cdot -1}\right) \]

      12. lower-*.f64 N/A

          \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c} \cdot -1}\right) \]

      13. lower-/.f64 N/A

          \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c} \cdot -1}\right) \]

      14. *-commutative N/A

          \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{c \cdot a} \cdot -1}\right) \]

      15. lower-*.f64 60.3

          \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, 0.5, \sqrt{\frac{1}{c \cdot a} \cdot -1}\right) \]

   4. Applied rewrites 60.3%

      \[\leadsto \color{blue}{\left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, 0.5, \sqrt{\frac{1}{c \cdot a} \cdot -1}\right)} \]

   5. Taylor expanded in a around inf

      \[\leadsto \left(-c\right) \cdot \left(\sqrt{\frac{1}{a \cdot c}} \cdot \color{blue}{\sqrt{-1}}\right) \]
   6. Step-by-step derivation

      1. *-commutative N/A

         \[\leadsto \left(-c\right) \cdot \left(\sqrt{\frac{1}{c \cdot a}} \cdot \sqrt{-1}\right) \]

      2. sqrt-prod N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{1}{c \cdot a} \cdot -1} \]

      3. lower-sqrt.f64 N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{1}{c \cdot a} \cdot -1} \]

      4. associate-*l/ N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{1 \cdot -1}{c \cdot a}} \]

      5. metadata-eval N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{c \cdot a}} \]

      6. *-commutative N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{a \cdot c}} \]

      7. lower-/.f64 N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{a \cdot c}} \]

      8. *-commutative N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{c \cdot a}} \]

      9. lift-*.f64 60.0

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{c \cdot a}} \]

   7. Applied rewrites 60.0%

      \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{c \cdot a}} \]
   8. Step-by-step derivation

      1. lift-*.f64 N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{c \cdot a}} \]

      2. *-commutative N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{a \cdot c}} \]

      3. lower-/.f64 N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{a \cdot c}} \]

      4. associate-/r* N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{\frac{-1}{a}}{c}} \]

      5. lower-/.f64 N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{\frac{-1}{a}}{c}} \]

      6. lower-/.f64 60.4

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{\frac{-1}{a}}{c}} \]

   9. Applied rewrites 60.4%

      \[\leadsto \left(-c\right) \cdot \sqrt{\frac{\frac{-1}{a}}{c}} \]

   if 1.60000000000000013e-4 < b

   1. Initial program 14.0%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in a around 0

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

      1. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot c}{\color{blue}{b}} \]

      2. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(c\right)}{b} \]

      3. lower-/.f64 N/A

         \[\leadsto \frac{\mathsf{neg}\left(c\right)}{\color{blue}{b}} \]

      4. lower-neg.f64 91.1

         \[\leadsto \frac{-c}{b} \]

   4. Applied rewrites 91.1%

      \[\leadsto \color{blue}{\frac{-c}{b}} \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 3: 79.5% accurate, 1.2× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;b \leq -5.3 \cdot 10^{-17}:\\ \;\;\;\;\frac{-b}{a} + \frac{c}{b}\\ \mathbf{elif}\;b \leq 0.00016:\\ \;\;\;\;\left(-c\right) \cdot \sqrt{\frac{-1}{c \cdot a}}\\ \mathbf{else}:\\ \;\;\;\;\frac{-c}{b}\\ \end{array} \end{array} \]

FPCore

(FPCore (a b c)
 :precision binary64
 (if (<= b -5.3e-17)
   (+ (/ (- b) a) (/ c b))
   (if (<= b 0.00016) (* (- c) (sqrt (/ -1.0 (* c a)))) (/ (- c) b))))

C

double code(double a, double b, double c) {
	double tmp;
	if (b <= -5.3e-17) {
		tmp = (-b / a) + (c / b);
	} else if (b <= 0.00016) {
		tmp = -c * sqrt((-1.0 / (c * a)));
	} else {
		tmp = -c / b;
	}
	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(a, b, c)
use fmin_fmax_functions
    real(8), intent (in) :: a
    real(8), intent (in) :: b
    real(8), intent (in) :: c
    real(8) :: tmp
    if (b <= (-5.3d-17)) then
        tmp = (-b / a) + (c / b)
    else if (b <= 0.00016d0) then
        tmp = -c * sqrt(((-1.0d0) / (c * a)))
    else
        tmp = -c / b
    end if
    code = tmp
end function

Java

public static double code(double a, double b, double c) {
	double tmp;
	if (b <= -5.3e-17) {
		tmp = (-b / a) + (c / b);
	} else if (b <= 0.00016) {
		tmp = -c * Math.sqrt((-1.0 / (c * a)));
	} else {
		tmp = -c / b;
	}
	return tmp;
}

Python

def code(a, b, c):
	tmp = 0
	if b <= -5.3e-17:
		tmp = (-b / a) + (c / b)
	elif b <= 0.00016:
		tmp = -c * math.sqrt((-1.0 / (c * a)))
	else:
		tmp = -c / b
	return tmp

Julia

function code(a, b, c)
	tmp = 0.0
	if (b <= -5.3e-17)
		tmp = Float64(Float64(Float64(-b) / a) + Float64(c / b));
	elseif (b <= 0.00016)
		tmp = Float64(Float64(-c) * sqrt(Float64(-1.0 / Float64(c * a))));
	else
		tmp = Float64(Float64(-c) / b);
	end
	return tmp
end

MATLAB

function tmp_2 = code(a, b, c)
	tmp = 0.0;
	if (b <= -5.3e-17)
		tmp = (-b / a) + (c / b);
	elseif (b <= 0.00016)
		tmp = -c * sqrt((-1.0 / (c * a)));
	else
		tmp = -c / b;
	end
	tmp_2 = tmp;
end

Wolfram

code[a_, b_, c_] := If[LessEqual[b, -5.3e-17], N[(N[((-b) / a), $MachinePrecision] + N[(c / b), $MachinePrecision]), $MachinePrecision], If[LessEqual[b, 0.00016], N[((-c) * N[Sqrt[N[(-1.0 / N[(c * a), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision], N[((-c) / b), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if b < -5.2999999999999998e-17

   1. Initial program 66.6%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]
   2. Step-by-step derivation

   3. Applied rewrites 66.7%

      \[\leadsto \color{blue}{\frac{\sqrt{\mathsf{fma}\left(-4 \cdot a, c, b \cdot b\right)} + \left(-b\right)}{a + a}} \]

   4. Taylor expanded in b around -inf

      \[\leadsto \color{blue}{-1 \cdot \left(b \cdot \left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)\right)} \]
   5. Step-by-step derivation

      1. associate-*r* N/A

         \[\leadsto \left(-1 \cdot b\right) \cdot \color{blue}{\left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)} \]

      2. mul-1-neg N/A

         \[\leadsto \left(\mathsf{neg}\left(b\right)\right) \cdot \left(\color{blue}{-1 \cdot \frac{c}{{b}^{2}}} + \frac{1}{a}\right) \]

      3. lift-neg.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(\color{blue}{-1 \cdot \frac{c}{{b}^{2}}} + \frac{1}{a}\right) \]

      4. lower-*.f64 N/A

         \[\leadsto \left(-b\right) \cdot \color{blue}{\left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)} \]

      5. lower-+.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(-1 \cdot \frac{c}{{b}^{2}} + \color{blue}{\frac{1}{a}}\right) \]

      6. associate-*r/ N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{-1 \cdot c}{{b}^{2}} + \frac{\color{blue}{1}}{a}\right) \]

      7. mul-1-neg N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{\mathsf{neg}\left(c\right)}{{b}^{2}} + \frac{1}{a}\right) \]

      8. lift-neg.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{{b}^{2}} + \frac{1}{a}\right) \]

      9. lower-/.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{{b}^{2}} + \frac{\color{blue}{1}}{a}\right) \]

      10. pow2 N/A

          \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right) \]

      11. lift-*.f64 N/A

          \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right) \]

      12. lower-/.f64 90.6

          \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{\color{blue}{a}}\right) \]

   6. Applied rewrites 90.6%

      \[\leadsto \color{blue}{\left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right)} \]

   7. Taylor expanded in a around inf

      \[\leadsto -1 \cdot \frac{b}{a} + \color{blue}{\frac{c}{b}} \]
   8. Step-by-step derivation

      1. lower-+.f64 N/A

         \[\leadsto -1 \cdot \frac{b}{a} + \frac{c}{\color{blue}{b}} \]

      2. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot b}{a} + \frac{c}{b} \]

      3. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(b\right)}{a} + \frac{c}{b} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\mathsf{neg}\left(b\right)}{a} + \frac{c}{b} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{-b}{a} + \frac{c}{b} \]

      6. lower-/.f64 90.9

         \[\leadsto \frac{-b}{a} + \frac{c}{b} \]

   9. Applied rewrites 90.9%

      \[\leadsto \frac{-b}{a} + \color{blue}{\frac{c}{b}} \]

   if -5.2999999999999998e-17 < b < 1.60000000000000013e-4

   1. Initial program 72.2%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in c around -inf

      \[\leadsto \color{blue}{-1 \cdot \left(c \cdot \left(\frac{1}{2} \cdot \frac{b}{a \cdot c} + \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right)\right)} \]
   3. Step-by-step derivation

      1. associate-*r* N/A

         \[\leadsto \left(-1 \cdot c\right) \cdot \color{blue}{\left(\frac{1}{2} \cdot \frac{b}{a \cdot c} + \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right)} \]

      2. mul-1-neg N/A

         \[\leadsto \left(\mathsf{neg}\left(c\right)\right) \cdot \left(\color{blue}{\frac{1}{2} \cdot \frac{b}{a \cdot c}} + \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right) \]

      3. lower-*.f64 N/A

         \[\leadsto \left(\mathsf{neg}\left(c\right)\right) \cdot \color{blue}{\left(\frac{1}{2} \cdot \frac{b}{a \cdot c} + \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right)} \]

      4. lower-neg.f64 N/A

         \[\leadsto \left(-c\right) \cdot \left(\color{blue}{\frac{1}{2} \cdot \frac{b}{a \cdot c}} + \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right) \]

      5. *-commutative N/A

         \[\leadsto \left(-c\right) \cdot \left(\frac{b}{a \cdot c} \cdot \frac{1}{2} + \color{blue}{\sqrt{\frac{1}{a \cdot c}}} \cdot \sqrt{-1}\right) \]

      6. lower-fma.f64 N/A

         \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{a \cdot c}, \color{blue}{\frac{1}{2}}, \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right) \]

      7. lower-/.f64 N/A

         \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{a \cdot c}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right) \]

      8. *-commutative N/A

         \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right) \]

      9. lower-*.f64 N/A

         \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c}} \cdot \sqrt{-1}\right) \]

      10. sqrt-unprod N/A

          \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c} \cdot -1}\right) \]

      11. lower-sqrt.f64 N/A

          \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c} \cdot -1}\right) \]

      12. lower-*.f64 N/A

          \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c} \cdot -1}\right) \]

      13. lower-/.f64 N/A

          \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{a \cdot c} \cdot -1}\right) \]

      14. *-commutative N/A

          \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, \frac{1}{2}, \sqrt{\frac{1}{c \cdot a} \cdot -1}\right) \]

      15. lower-*.f64 60.3

          \[\leadsto \left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, 0.5, \sqrt{\frac{1}{c \cdot a} \cdot -1}\right) \]

   4. Applied rewrites 60.3%

      \[\leadsto \color{blue}{\left(-c\right) \cdot \mathsf{fma}\left(\frac{b}{c \cdot a}, 0.5, \sqrt{\frac{1}{c \cdot a} \cdot -1}\right)} \]

   5. Taylor expanded in a around inf

      \[\leadsto \left(-c\right) \cdot \left(\sqrt{\frac{1}{a \cdot c}} \cdot \color{blue}{\sqrt{-1}}\right) \]
   6. Step-by-step derivation

      1. *-commutative N/A

         \[\leadsto \left(-c\right) \cdot \left(\sqrt{\frac{1}{c \cdot a}} \cdot \sqrt{-1}\right) \]

      2. sqrt-prod N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{1}{c \cdot a} \cdot -1} \]

      3. lower-sqrt.f64 N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{1}{c \cdot a} \cdot -1} \]

      4. associate-*l/ N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{1 \cdot -1}{c \cdot a}} \]

      5. metadata-eval N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{c \cdot a}} \]

      6. *-commutative N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{a \cdot c}} \]

      7. lower-/.f64 N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{a \cdot c}} \]

      8. *-commutative N/A

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{c \cdot a}} \]

      9. lift-*.f64 60.0

         \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{c \cdot a}} \]

   7. Applied rewrites 60.0%

      \[\leadsto \left(-c\right) \cdot \sqrt{\frac{-1}{c \cdot a}} \]

   if 1.60000000000000013e-4 < b

   1. Initial program 14.0%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in a around 0

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

      1. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot c}{\color{blue}{b}} \]

      2. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(c\right)}{b} \]

      3. lower-/.f64 N/A

         \[\leadsto \frac{\mathsf{neg}\left(c\right)}{\color{blue}{b}} \]

      4. lower-neg.f64 91.1

         \[\leadsto \frac{-c}{b} \]

   4. Applied rewrites 91.1%

      \[\leadsto \color{blue}{\frac{-c}{b}} \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 4: 69.9% accurate, 1.6× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;b \leq -1.1 \cdot 10^{-17}:\\ \;\;\;\;\frac{-b}{a} + \frac{c}{b}\\ \mathbf{elif}\;b \leq 8.6 \cdot 10^{-179}:\\ \;\;\;\;\sqrt{\frac{-c}{a}}\\ \mathbf{else}:\\ \;\;\;\;\frac{-c}{b}\\ \end{array} \end{array} \]

FPCore

(FPCore (a b c)
 :precision binary64
 (if (<= b -1.1e-17)
   (+ (/ (- b) a) (/ c b))
   (if (<= b 8.6e-179) (sqrt (/ (- c) a)) (/ (- c) b))))

C

double code(double a, double b, double c) {
	double tmp;
	if (b <= -1.1e-17) {
		tmp = (-b / a) + (c / b);
	} else if (b <= 8.6e-179) {
		tmp = sqrt((-c / a));
	} else {
		tmp = -c / b;
	}
	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(a, b, c)
use fmin_fmax_functions
    real(8), intent (in) :: a
    real(8), intent (in) :: b
    real(8), intent (in) :: c
    real(8) :: tmp
    if (b <= (-1.1d-17)) then
        tmp = (-b / a) + (c / b)
    else if (b <= 8.6d-179) then
        tmp = sqrt((-c / a))
    else
        tmp = -c / b
    end if
    code = tmp
end function

Java

public static double code(double a, double b, double c) {
	double tmp;
	if (b <= -1.1e-17) {
		tmp = (-b / a) + (c / b);
	} else if (b <= 8.6e-179) {
		tmp = Math.sqrt((-c / a));
	} else {
		tmp = -c / b;
	}
	return tmp;
}

Python

def code(a, b, c):
	tmp = 0
	if b <= -1.1e-17:
		tmp = (-b / a) + (c / b)
	elif b <= 8.6e-179:
		tmp = math.sqrt((-c / a))
	else:
		tmp = -c / b
	return tmp

Julia

function code(a, b, c)
	tmp = 0.0
	if (b <= -1.1e-17)
		tmp = Float64(Float64(Float64(-b) / a) + Float64(c / b));
	elseif (b <= 8.6e-179)
		tmp = sqrt(Float64(Float64(-c) / a));
	else
		tmp = Float64(Float64(-c) / b);
	end
	return tmp
end

MATLAB

function tmp_2 = code(a, b, c)
	tmp = 0.0;
	if (b <= -1.1e-17)
		tmp = (-b / a) + (c / b);
	elseif (b <= 8.6e-179)
		tmp = sqrt((-c / a));
	else
		tmp = -c / b;
	end
	tmp_2 = tmp;
end

Wolfram

code[a_, b_, c_] := If[LessEqual[b, -1.1e-17], N[(N[((-b) / a), $MachinePrecision] + N[(c / b), $MachinePrecision]), $MachinePrecision], If[LessEqual[b, 8.6e-179], N[Sqrt[N[((-c) / a), $MachinePrecision]], $MachinePrecision], N[((-c) / b), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if b < -1.1e-17

   1. Initial program 66.7%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]
   2. Step-by-step derivation

   3. Applied rewrites 66.8%

      \[\leadsto \color{blue}{\frac{\sqrt{\mathsf{fma}\left(-4 \cdot a, c, b \cdot b\right)} + \left(-b\right)}{a + a}} \]

   4. Taylor expanded in b around -inf

      \[\leadsto \color{blue}{-1 \cdot \left(b \cdot \left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)\right)} \]
   5. Step-by-step derivation

      1. associate-*r* N/A

         \[\leadsto \left(-1 \cdot b\right) \cdot \color{blue}{\left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)} \]

      2. mul-1-neg N/A

         \[\leadsto \left(\mathsf{neg}\left(b\right)\right) \cdot \left(\color{blue}{-1 \cdot \frac{c}{{b}^{2}}} + \frac{1}{a}\right) \]

      3. lift-neg.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(\color{blue}{-1 \cdot \frac{c}{{b}^{2}}} + \frac{1}{a}\right) \]

      4. lower-*.f64 N/A

         \[\leadsto \left(-b\right) \cdot \color{blue}{\left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)} \]

      5. lower-+.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(-1 \cdot \frac{c}{{b}^{2}} + \color{blue}{\frac{1}{a}}\right) \]

      6. associate-*r/ N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{-1 \cdot c}{{b}^{2}} + \frac{\color{blue}{1}}{a}\right) \]

      7. mul-1-neg N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{\mathsf{neg}\left(c\right)}{{b}^{2}} + \frac{1}{a}\right) \]

      8. lift-neg.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{{b}^{2}} + \frac{1}{a}\right) \]

      9. lower-/.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{{b}^{2}} + \frac{\color{blue}{1}}{a}\right) \]

      10. pow2 N/A

          \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right) \]

      11. lift-*.f64 N/A

          \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right) \]

      12. lower-/.f64 90.5

          \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{\color{blue}{a}}\right) \]

   6. Applied rewrites 90.5%

      \[\leadsto \color{blue}{\left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right)} \]

   7. Taylor expanded in a around inf

      \[\leadsto -1 \cdot \frac{b}{a} + \color{blue}{\frac{c}{b}} \]
   8. Step-by-step derivation

      1. lower-+.f64 N/A

         \[\leadsto -1 \cdot \frac{b}{a} + \frac{c}{\color{blue}{b}} \]

      2. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot b}{a} + \frac{c}{b} \]

      3. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(b\right)}{a} + \frac{c}{b} \]

      4. lower-/.f64 N/A

         \[\leadsto \frac{\mathsf{neg}\left(b\right)}{a} + \frac{c}{b} \]

      5. lift-neg.f64 N/A

         \[\leadsto \frac{-b}{a} + \frac{c}{b} \]

      6. lower-/.f64 90.9

         \[\leadsto \frac{-b}{a} + \frac{c}{b} \]

   9. Applied rewrites 90.9%

      \[\leadsto \frac{-b}{a} + \color{blue}{\frac{c}{b}} \]

   if -1.1e-17 < b < 8.60000000000000052e-179

   1. Initial program 81.2%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in a around inf

      \[\leadsto \color{blue}{\frac{1}{2} \cdot \left(\sqrt{\frac{c}{a}} \cdot \sqrt{-4}\right)} \]
   3. Step-by-step derivation

      1. *-commutative N/A

         \[\leadsto \left(\sqrt{\frac{c}{a}} \cdot \sqrt{-4}\right) \cdot \color{blue}{\frac{1}{2}} \]

      2. lower-*.f64 N/A

         \[\leadsto \left(\sqrt{\frac{c}{a}} \cdot \sqrt{-4}\right) \cdot \color{blue}{\frac{1}{2}} \]

      3. sqrt-unprod N/A

         \[\leadsto \sqrt{\frac{c}{a} \cdot -4} \cdot \frac{1}{2} \]

      4. lower-sqrt.f64 N/A

         \[\leadsto \sqrt{\frac{c}{a} \cdot -4} \cdot \frac{1}{2} \]

      5. lower-*.f64 N/A

         \[\leadsto \sqrt{\frac{c}{a} \cdot -4} \cdot \frac{1}{2} \]

      6. lower-/.f64 30.4

         \[\leadsto \sqrt{\frac{c}{a} \cdot -4} \cdot 0.5 \]

   4. Applied rewrites 30.4%

      \[\leadsto \color{blue}{\sqrt{\frac{c}{a} \cdot -4} \cdot 0.5} \]

   5. Taylor expanded in a around -inf

      \[\leadsto \sqrt{\frac{c}{a}} \cdot \color{blue}{\sqrt{-1}} \]
   6. Step-by-step derivation

      1. sqrt-unprod N/A

         \[\leadsto \sqrt{\frac{c}{a} \cdot -1} \]

      2. *-commutative N/A

         \[\leadsto \sqrt{-1 \cdot \frac{c}{a}} \]

      3. lower-sqrt.f64 N/A

         \[\leadsto \sqrt{-1 \cdot \frac{c}{a}} \]

      4. associate-*r/ N/A

         \[\leadsto \sqrt{\frac{-1 \cdot c}{a}} \]

      5. mul-1-neg N/A

         \[\leadsto \sqrt{\frac{\mathsf{neg}\left(c\right)}{a}} \]

      6. lift-neg.f64 N/A

         \[\leadsto \sqrt{\frac{-c}{a}} \]

      7. lower-/.f64 30.5

         \[\leadsto \sqrt{\frac{-c}{a}} \]

   7. Applied rewrites 30.5%

      \[\leadsto \sqrt{\frac{-c}{a}} \]

   if 8.60000000000000052e-179 < b

   1. Initial program 24.2%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in a around 0

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

      1. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot c}{\color{blue}{b}} \]

      2. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(c\right)}{b} \]

      3. lower-/.f64 N/A

         \[\leadsto \frac{\mathsf{neg}\left(c\right)}{\color{blue}{b}} \]

      4. lower-neg.f64 78.1

         \[\leadsto \frac{-c}{b} \]

   4. Applied rewrites 78.1%

      \[\leadsto \color{blue}{\frac{-c}{b}} \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 5: 69.8% accurate, 1.7× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;b \leq -1.1 \cdot 10^{-17}:\\ \;\;\;\;\frac{-b}{a}\\ \mathbf{elif}\;b \leq 8.6 \cdot 10^{-179}:\\ \;\;\;\;\sqrt{\frac{-c}{a}}\\ \mathbf{else}:\\ \;\;\;\;\frac{-c}{b}\\ \end{array} \end{array} \]

FPCore

(FPCore (a b c)
 :precision binary64
 (if (<= b -1.1e-17)
   (/ (- b) a)
   (if (<= b 8.6e-179) (sqrt (/ (- c) a)) (/ (- c) b))))

C

double code(double a, double b, double c) {
	double tmp;
	if (b <= -1.1e-17) {
		tmp = -b / a;
	} else if (b <= 8.6e-179) {
		tmp = sqrt((-c / a));
	} else {
		tmp = -c / b;
	}
	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(a, b, c)
use fmin_fmax_functions
    real(8), intent (in) :: a
    real(8), intent (in) :: b
    real(8), intent (in) :: c
    real(8) :: tmp
    if (b <= (-1.1d-17)) then
        tmp = -b / a
    else if (b <= 8.6d-179) then
        tmp = sqrt((-c / a))
    else
        tmp = -c / b
    end if
    code = tmp
end function

Java

public static double code(double a, double b, double c) {
	double tmp;
	if (b <= -1.1e-17) {
		tmp = -b / a;
	} else if (b <= 8.6e-179) {
		tmp = Math.sqrt((-c / a));
	} else {
		tmp = -c / b;
	}
	return tmp;
}

Python

def code(a, b, c):
	tmp = 0
	if b <= -1.1e-17:
		tmp = -b / a
	elif b <= 8.6e-179:
		tmp = math.sqrt((-c / a))
	else:
		tmp = -c / b
	return tmp

Julia

function code(a, b, c)
	tmp = 0.0
	if (b <= -1.1e-17)
		tmp = Float64(Float64(-b) / a);
	elseif (b <= 8.6e-179)
		tmp = sqrt(Float64(Float64(-c) / a));
	else
		tmp = Float64(Float64(-c) / b);
	end
	return tmp
end

MATLAB

function tmp_2 = code(a, b, c)
	tmp = 0.0;
	if (b <= -1.1e-17)
		tmp = -b / a;
	elseif (b <= 8.6e-179)
		tmp = sqrt((-c / a));
	else
		tmp = -c / b;
	end
	tmp_2 = tmp;
end

Wolfram

code[a_, b_, c_] := If[LessEqual[b, -1.1e-17], N[((-b) / a), $MachinePrecision], If[LessEqual[b, 8.6e-179], N[Sqrt[N[((-c) / a), $MachinePrecision]], $MachinePrecision], N[((-c) / b), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if b < -1.1e-17

   1. Initial program 66.7%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in b around -inf

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

      1. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot b}{\color{blue}{a}} \]

      2. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(b\right)}{a} \]

      3. lift-neg.f64 N/A

         \[\leadsto \frac{-b}{a} \]

      4. lower-/.f64 90.6

         \[\leadsto \frac{-b}{\color{blue}{a}} \]

   4. Applied rewrites 90.6%

      \[\leadsto \color{blue}{\frac{-b}{a}} \]

   if -1.1e-17 < b < 8.60000000000000052e-179

   1. Initial program 81.2%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in a around inf

      \[\leadsto \color{blue}{\frac{1}{2} \cdot \left(\sqrt{\frac{c}{a}} \cdot \sqrt{-4}\right)} \]
   3. Step-by-step derivation

      1. *-commutative N/A

         \[\leadsto \left(\sqrt{\frac{c}{a}} \cdot \sqrt{-4}\right) \cdot \color{blue}{\frac{1}{2}} \]

      2. lower-*.f64 N/A

         \[\leadsto \left(\sqrt{\frac{c}{a}} \cdot \sqrt{-4}\right) \cdot \color{blue}{\frac{1}{2}} \]

      3. sqrt-unprod N/A

         \[\leadsto \sqrt{\frac{c}{a} \cdot -4} \cdot \frac{1}{2} \]

      4. lower-sqrt.f64 N/A

         \[\leadsto \sqrt{\frac{c}{a} \cdot -4} \cdot \frac{1}{2} \]

      5. lower-*.f64 N/A

         \[\leadsto \sqrt{\frac{c}{a} \cdot -4} \cdot \frac{1}{2} \]

      6. lower-/.f64 30.4

         \[\leadsto \sqrt{\frac{c}{a} \cdot -4} \cdot 0.5 \]

   4. Applied rewrites 30.4%

      \[\leadsto \color{blue}{\sqrt{\frac{c}{a} \cdot -4} \cdot 0.5} \]

   5. Taylor expanded in a around -inf

      \[\leadsto \sqrt{\frac{c}{a}} \cdot \color{blue}{\sqrt{-1}} \]
   6. Step-by-step derivation

      1. sqrt-unprod N/A

         \[\leadsto \sqrt{\frac{c}{a} \cdot -1} \]

      2. *-commutative N/A

         \[\leadsto \sqrt{-1 \cdot \frac{c}{a}} \]

      3. lower-sqrt.f64 N/A

         \[\leadsto \sqrt{-1 \cdot \frac{c}{a}} \]

      4. associate-*r/ N/A

         \[\leadsto \sqrt{\frac{-1 \cdot c}{a}} \]

      5. mul-1-neg N/A

         \[\leadsto \sqrt{\frac{\mathsf{neg}\left(c\right)}{a}} \]

      6. lift-neg.f64 N/A

         \[\leadsto \sqrt{\frac{-c}{a}} \]

      7. lower-/.f64 30.5

         \[\leadsto \sqrt{\frac{-c}{a}} \]

   7. Applied rewrites 30.5%

      \[\leadsto \sqrt{\frac{-c}{a}} \]

   if 8.60000000000000052e-179 < b

   1. Initial program 24.2%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in a around 0

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

      1. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot c}{\color{blue}{b}} \]

      2. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(c\right)}{b} \]

      3. lower-/.f64 N/A

         \[\leadsto \frac{\mathsf{neg}\left(c\right)}{\color{blue}{b}} \]

      4. lower-neg.f64 78.1

         \[\leadsto \frac{-c}{b} \]

   4. Applied rewrites 78.1%

      \[\leadsto \color{blue}{\frac{-c}{b}} \]
3. Recombined 3 regimes into one program.
4. Add Preprocessing

Alternative 6: 67.7% accurate, 2.7× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;b \leq -5 \cdot 10^{-310}:\\ \;\;\;\;\frac{-b}{a}\\ \mathbf{else}:\\ \;\;\;\;\frac{-c}{b}\\ \end{array} \end{array} \]

FPCore

(FPCore (a b c)
 :precision binary64
 (if (<= b -5e-310) (/ (- b) a) (/ (- c) b)))

C

double code(double a, double b, double c) {
	double tmp;
	if (b <= -5e-310) {
		tmp = -b / a;
	} else {
		tmp = -c / b;
	}
	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(a, b, c)
use fmin_fmax_functions
    real(8), intent (in) :: a
    real(8), intent (in) :: b
    real(8), intent (in) :: c
    real(8) :: tmp
    if (b <= (-5d-310)) then
        tmp = -b / a
    else
        tmp = -c / b
    end if
    code = tmp
end function

Java

public static double code(double a, double b, double c) {
	double tmp;
	if (b <= -5e-310) {
		tmp = -b / a;
	} else {
		tmp = -c / b;
	}
	return tmp;
}

Python

def code(a, b, c):
	tmp = 0
	if b <= -5e-310:
		tmp = -b / a
	else:
		tmp = -c / b
	return tmp

Julia

function code(a, b, c)
	tmp = 0.0
	if (b <= -5e-310)
		tmp = Float64(Float64(-b) / a);
	else
		tmp = Float64(Float64(-c) / b);
	end
	return tmp
end

MATLAB

function tmp_2 = code(a, b, c)
	tmp = 0.0;
	if (b <= -5e-310)
		tmp = -b / a;
	else
		tmp = -c / b;
	end
	tmp_2 = tmp;
end

Wolfram

code[a_, b_, c_] := If[LessEqual[b, -5e-310], N[((-b) / a), $MachinePrecision], N[((-c) / b), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if b < -4.999999999999985e-310

   1. Initial program 72.8%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in b around -inf

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

      1. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot b}{\color{blue}{a}} \]

      2. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(b\right)}{a} \]

      3. lift-neg.f64 N/A

         \[\leadsto \frac{-b}{a} \]

      4. lower-/.f64 67.3

         \[\leadsto \frac{-b}{\color{blue}{a}} \]

   4. Applied rewrites 67.3%

      \[\leadsto \color{blue}{\frac{-b}{a}} \]

   if -4.999999999999985e-310 < b

   1. Initial program 31.8%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in a around 0

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

      1. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot c}{\color{blue}{b}} \]

      2. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(c\right)}{b} \]

      3. lower-/.f64 N/A

         \[\leadsto \frac{\mathsf{neg}\left(c\right)}{\color{blue}{b}} \]

      4. lower-neg.f64 68.1

         \[\leadsto \frac{-c}{b} \]

   4. Applied rewrites 68.1%

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

Alternative 7: 42.8% accurate, 2.7× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;b \leq 5.5 \cdot 10^{+70}:\\ \;\;\;\;\frac{-b}{a}\\ \mathbf{else}:\\ \;\;\;\;\frac{c}{b}\\ \end{array} \end{array} \]

FPCore

(FPCore (a b c) :precision binary64 (if (<= b 5.5e+70) (/ (- b) a) (/ c b)))

C

double code(double a, double b, double c) {
	double tmp;
	if (b <= 5.5e+70) {
		tmp = -b / a;
	} else {
		tmp = c / b;
	}
	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(a, b, c)
use fmin_fmax_functions
    real(8), intent (in) :: a
    real(8), intent (in) :: b
    real(8), intent (in) :: c
    real(8) :: tmp
    if (b <= 5.5d+70) then
        tmp = -b / a
    else
        tmp = c / b
    end if
    code = tmp
end function

Java

public static double code(double a, double b, double c) {
	double tmp;
	if (b <= 5.5e+70) {
		tmp = -b / a;
	} else {
		tmp = c / b;
	}
	return tmp;
}

Python

def code(a, b, c):
	tmp = 0
	if b <= 5.5e+70:
		tmp = -b / a
	else:
		tmp = c / b
	return tmp

Julia

function code(a, b, c)
	tmp = 0.0
	if (b <= 5.5e+70)
		tmp = Float64(Float64(-b) / a);
	else
		tmp = Float64(c / b);
	end
	return tmp
end

MATLAB

function tmp_2 = code(a, b, c)
	tmp = 0.0;
	if (b <= 5.5e+70)
		tmp = -b / a;
	else
		tmp = c / b;
	end
	tmp_2 = tmp;
end

Wolfram

code[a_, b_, c_] := If[LessEqual[b, 5.5e+70], N[((-b) / a), $MachinePrecision], N[(c / b), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if b < 5.49999999999999986e70

   1. Initial program 66.1%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]

   2. Taylor expanded in b around -inf

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

      1. associate-*r/ N/A

         \[\leadsto \frac{-1 \cdot b}{\color{blue}{a}} \]

      2. mul-1-neg N/A

         \[\leadsto \frac{\mathsf{neg}\left(b\right)}{a} \]

      3. lift-neg.f64 N/A

         \[\leadsto \frac{-b}{a} \]

      4. lower-/.f64 45.8

         \[\leadsto \frac{-b}{\color{blue}{a}} \]

   4. Applied rewrites 45.8%

      \[\leadsto \color{blue}{\frac{-b}{a}} \]

   if 5.49999999999999986e70 < b

   1. Initial program 10.6%

      \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]
   2. Step-by-step derivation

   3. Applied rewrites 10.6%

      \[\leadsto \color{blue}{\frac{\sqrt{\mathsf{fma}\left(-4 \cdot a, c, b \cdot b\right)} + \left(-b\right)}{a + a}} \]

   4. Taylor expanded in b around -inf

      \[\leadsto \color{blue}{-1 \cdot \left(b \cdot \left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)\right)} \]
   5. Step-by-step derivation

      1. associate-*r* N/A

         \[\leadsto \left(-1 \cdot b\right) \cdot \color{blue}{\left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)} \]

      2. mul-1-neg N/A

         \[\leadsto \left(\mathsf{neg}\left(b\right)\right) \cdot \left(\color{blue}{-1 \cdot \frac{c}{{b}^{2}}} + \frac{1}{a}\right) \]

      3. lift-neg.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(\color{blue}{-1 \cdot \frac{c}{{b}^{2}}} + \frac{1}{a}\right) \]

      4. lower-*.f64 N/A

         \[\leadsto \left(-b\right) \cdot \color{blue}{\left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)} \]

      5. lower-+.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(-1 \cdot \frac{c}{{b}^{2}} + \color{blue}{\frac{1}{a}}\right) \]

      6. associate-*r/ N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{-1 \cdot c}{{b}^{2}} + \frac{\color{blue}{1}}{a}\right) \]

      7. mul-1-neg N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{\mathsf{neg}\left(c\right)}{{b}^{2}} + \frac{1}{a}\right) \]

      8. lift-neg.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{{b}^{2}} + \frac{1}{a}\right) \]

      9. lower-/.f64 N/A

         \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{{b}^{2}} + \frac{\color{blue}{1}}{a}\right) \]

      10. pow2 N/A

          \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right) \]

      11. lift-*.f64 N/A

          \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right) \]

      12. lower-/.f64 2.4

          \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{\color{blue}{a}}\right) \]

   6. Applied rewrites 2.4%

      \[\leadsto \color{blue}{\left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right)} \]

   7. Taylor expanded in a around inf

      \[\leadsto \frac{c}{\color{blue}{b}} \]
   8. Step-by-step derivation

      1. lower-/.f64 33.6

         \[\leadsto \frac{c}{b} \]

   9. Applied rewrites 33.6%

      \[\leadsto \frac{c}{\color{blue}{b}} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 8: 11.0% accurate, 5.6× speedup

Math

\[\begin{array}{l} \\ \frac{c}{b} \end{array} \]

FPCore

(FPCore (a b c) :precision binary64 (/ c b))

C

double code(double a, double b, double c) {
	return c / b;
}

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(a, b, c)
use fmin_fmax_functions
    real(8), intent (in) :: a
    real(8), intent (in) :: b
    real(8), intent (in) :: c
    code = c / b
end function

Java

public static double code(double a, double b, double c) {
	return c / b;
}

Python

def code(a, b, c):
	return c / b

Julia

function code(a, b, c)
	return Float64(c / b)
end

MATLAB

function tmp = code(a, b, c)
	tmp = c / b;
end

Wolfram

code[a_, b_, c_] := N[(c / b), $MachinePrecision]

Derivation

1. Initial program 52.3%

   \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a} \]
2. Step-by-step derivation

3. Applied rewrites 52.3%

   \[\leadsto \color{blue}{\frac{\sqrt{\mathsf{fma}\left(-4 \cdot a, c, b \cdot b\right)} + \left(-b\right)}{a + a}} \]

4. Taylor expanded in b around -inf

   \[\leadsto \color{blue}{-1 \cdot \left(b \cdot \left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)\right)} \]
5. Step-by-step derivation

   1. associate-*r* N/A

      \[\leadsto \left(-1 \cdot b\right) \cdot \color{blue}{\left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)} \]

   2. mul-1-neg N/A

      \[\leadsto \left(\mathsf{neg}\left(b\right)\right) \cdot \left(\color{blue}{-1 \cdot \frac{c}{{b}^{2}}} + \frac{1}{a}\right) \]

   3. lift-neg.f64 N/A

      \[\leadsto \left(-b\right) \cdot \left(\color{blue}{-1 \cdot \frac{c}{{b}^{2}}} + \frac{1}{a}\right) \]

   4. lower-*.f64 N/A

      \[\leadsto \left(-b\right) \cdot \color{blue}{\left(-1 \cdot \frac{c}{{b}^{2}} + \frac{1}{a}\right)} \]

   5. lower-+.f64 N/A

      \[\leadsto \left(-b\right) \cdot \left(-1 \cdot \frac{c}{{b}^{2}} + \color{blue}{\frac{1}{a}}\right) \]

   6. associate-*r/ N/A

      \[\leadsto \left(-b\right) \cdot \left(\frac{-1 \cdot c}{{b}^{2}} + \frac{\color{blue}{1}}{a}\right) \]

   7. mul-1-neg N/A

      \[\leadsto \left(-b\right) \cdot \left(\frac{\mathsf{neg}\left(c\right)}{{b}^{2}} + \frac{1}{a}\right) \]

   8. lift-neg.f64 N/A

      \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{{b}^{2}} + \frac{1}{a}\right) \]

   9. lower-/.f64 N/A

      \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{{b}^{2}} + \frac{\color{blue}{1}}{a}\right) \]

   10. pow2 N/A

       \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right) \]

   11. lift-*.f64 N/A

       \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right) \]

   12. lower-/.f64 34.3

       \[\leadsto \left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{\color{blue}{a}}\right) \]

6. Applied rewrites 34.3%

   \[\leadsto \color{blue}{\left(-b\right) \cdot \left(\frac{-c}{b \cdot b} + \frac{1}{a}\right)} \]

7. Taylor expanded in a around inf

   \[\leadsto \frac{c}{\color{blue}{b}} \]
8. Step-by-step derivation

   1. lower-/.f64 11.0

      \[\leadsto \frac{c}{b} \]

9. Applied rewrites 11.0%

   \[\leadsto \frac{c}{\color{blue}{b}} \]
10. Add Preprocessing

Reproduce

herbie shell --seed 2025122 
(FPCore (a b c)
  :name "Quadratic roots, full range"
  :precision binary64
  (/ (+ (- b) (sqrt (- (* b b) (* (* 4.0 a) c)))) (* 2.0 a)))