Numeric.SpecFunctions:invIncompleteBetaWorker from math-functions-0.1.5.2, F

Percentage Accurate: 77.7% → 99.4%

Time: 9.6s

Alternatives: 11

Speedup: 9.6×

Specification

Math

\[\begin{array}{l} \\ \frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (/ (exp (* x (log (/ x (+ x y))))) x))

C

double code(double x, double y) {
	return exp((x * log((x / (x + y))))) / x;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = exp((x * log((x / (x + y))))) / x
end function

Java

public static double code(double x, double y) {
	return Math.exp((x * Math.log((x / (x + y))))) / x;
}

Python

def code(x, y):
	return math.exp((x * math.log((x / (x + y))))) / x

Julia

function code(x, y)
	return Float64(exp(Float64(x * log(Float64(x / Float64(x + y))))) / x)
end

MATLAB

function tmp = code(x, y)
	tmp = exp((x * log((x / (x + y))))) / x;
end

Wolfram

code[x_, y_] := N[(N[Exp[N[(x * N[Log[N[(x / N[(x + y), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]], $MachinePrecision] / x), $MachinePrecision]

Initial Program: 77.7% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (/ (exp (* x (log (/ x (+ x y))))) x))

C

double code(double x, double y) {
	return exp((x * log((x / (x + y))))) / x;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = exp((x * log((x / (x + y))))) / x
end function

Java

public static double code(double x, double y) {
	return Math.exp((x * Math.log((x / (x + y))))) / x;
}

Python

def code(x, y):
	return math.exp((x * math.log((x / (x + y))))) / x

Julia

function code(x, y)
	return Float64(exp(Float64(x * log(Float64(x / Float64(x + y))))) / x)
end

MATLAB

function tmp = code(x, y)
	tmp = exp((x * log((x / (x + y))))) / x;
end

Wolfram

code[x_, y_] := N[(N[Exp[N[(x * N[Log[N[(x / N[(x + y), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]], $MachinePrecision] / x), $MachinePrecision]

Alternative 1: 99.4% accurate, 1.8× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{e^{-y}}{x}\\ \mathbf{if}\;x \leq -0.87:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;x \leq 1.95:\\ \;\;\;\;\frac{1}{x}\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (let* ((t_0 (/ (exp (- y)) x)))
   (if (<= x -0.87) t_0 (if (<= x 1.95) (/ 1.0 x) t_0))))

C

double code(double x, double y) {
	double t_0 = exp(-y) / x;
	double tmp;
	if (x <= -0.87) {
		tmp = t_0;
	} else if (x <= 1.95) {
		tmp = 1.0 / x;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: t_0
    real(8) :: tmp
    t_0 = exp(-y) / x
    if (x <= (-0.87d0)) then
        tmp = t_0
    else if (x <= 1.95d0) then
        tmp = 1.0d0 / x
    else
        tmp = t_0
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double t_0 = Math.exp(-y) / x;
	double tmp;
	if (x <= -0.87) {
		tmp = t_0;
	} else if (x <= 1.95) {
		tmp = 1.0 / x;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Python

def code(x, y):
	t_0 = math.exp(-y) / x
	tmp = 0
	if x <= -0.87:
		tmp = t_0
	elif x <= 1.95:
		tmp = 1.0 / x
	else:
		tmp = t_0
	return tmp

Julia

function code(x, y)
	t_0 = Float64(exp(Float64(-y)) / x)
	tmp = 0.0
	if (x <= -0.87)
		tmp = t_0;
	elseif (x <= 1.95)
		tmp = Float64(1.0 / x);
	else
		tmp = t_0;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	t_0 = exp(-y) / x;
	tmp = 0.0;
	if (x <= -0.87)
		tmp = t_0;
	elseif (x <= 1.95)
		tmp = 1.0 / x;
	else
		tmp = t_0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := Block[{t$95$0 = N[(N[Exp[(-y)], $MachinePrecision] / x), $MachinePrecision]}, If[LessEqual[x, -0.87], t$95$0, If[LessEqual[x, 1.95], N[(1.0 / x), $MachinePrecision], t$95$0]]]

Derivation

1. Split input into 2 regimes

2. if x < -0.869999999999999996 or 1.94999999999999996 < x

   1. Initial program 71.1%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \frac{e^{\color{blue}{-1 \cdot y}}}{x} \]
   4. Step-by-step derivation

      1. mul-1-neg N/A

         \[\leadsto \frac{e^{\color{blue}{\mathsf{neg}\left(y\right)}}}{x} \]

      2. lower-neg.f64 100.0

         \[\leadsto \frac{e^{\color{blue}{-y}}}{x} \]

   5. Applied rewrites 100.0%

      \[\leadsto \frac{e^{\color{blue}{-y}}}{x} \]

   if -0.869999999999999996 < x < 1.94999999999999996

   1. Initial program 71.8%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \frac{\color{blue}{1}}{x} \]
   4. Step-by-step derivation

   5. Applied rewrites 97.5%

      \[\leadsto \frac{\color{blue}{1}}{x} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 2: 86.8% accurate, 2.5× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{0.3333333333333333}{x \cdot x}\\ \mathbf{if}\;x \leq -0.75:\\ \;\;\;\;\frac{\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(t\_0 + \left(\frac{0.5}{x} + 0.16666666666666666\right), -y, \frac{0.5}{x} + 0.5\right), y, -1\right), y, 1\right)}{x}\\ \mathbf{elif}\;x \leq 0.94:\\ \;\;\;\;\frac{1}{x}\\ \mathbf{else}:\\ \;\;\;\;\frac{1}{\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\left(t\_0 + 0.16666666666666666\right) - \frac{0.5}{x}, y, 0.5 - \frac{0.5}{x}\right), y, 1\right), y, 1\right) \cdot x}\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (let* ((t_0 (/ 0.3333333333333333 (* x x))))
   (if (<= x -0.75)
     (/
      (fma
       (fma
        (fma (+ t_0 (+ (/ 0.5 x) 0.16666666666666666)) (- y) (+ (/ 0.5 x) 0.5))
        y
        -1.0)
       y
       1.0)
      x)
     (if (<= x 0.94)
       (/ 1.0 x)
       (/
        1.0
        (*
         (fma
          (fma
           (fma (- (+ t_0 0.16666666666666666) (/ 0.5 x)) y (- 0.5 (/ 0.5 x)))
           y
           1.0)
          y
          1.0)
         x))))))

C

double code(double x, double y) {
	double t_0 = 0.3333333333333333 / (x * x);
	double tmp;
	if (x <= -0.75) {
		tmp = fma(fma(fma((t_0 + ((0.5 / x) + 0.16666666666666666)), -y, ((0.5 / x) + 0.5)), y, -1.0), y, 1.0) / x;
	} else if (x <= 0.94) {
		tmp = 1.0 / x;
	} else {
		tmp = 1.0 / (fma(fma(fma(((t_0 + 0.16666666666666666) - (0.5 / x)), y, (0.5 - (0.5 / x))), y, 1.0), y, 1.0) * x);
	}
	return tmp;
}

Julia

function code(x, y)
	t_0 = Float64(0.3333333333333333 / Float64(x * x))
	tmp = 0.0
	if (x <= -0.75)
		tmp = Float64(fma(fma(fma(Float64(t_0 + Float64(Float64(0.5 / x) + 0.16666666666666666)), Float64(-y), Float64(Float64(0.5 / x) + 0.5)), y, -1.0), y, 1.0) / x);
	elseif (x <= 0.94)
		tmp = Float64(1.0 / x);
	else
		tmp = Float64(1.0 / Float64(fma(fma(fma(Float64(Float64(t_0 + 0.16666666666666666) - Float64(0.5 / x)), y, Float64(0.5 - Float64(0.5 / x))), y, 1.0), y, 1.0) * x));
	end
	return tmp
end

Wolfram

code[x_, y_] := Block[{t$95$0 = N[(0.3333333333333333 / N[(x * x), $MachinePrecision]), $MachinePrecision]}, If[LessEqual[x, -0.75], N[(N[(N[(N[(N[(t$95$0 + N[(N[(0.5 / x), $MachinePrecision] + 0.16666666666666666), $MachinePrecision]), $MachinePrecision] * (-y) + N[(N[(0.5 / x), $MachinePrecision] + 0.5), $MachinePrecision]), $MachinePrecision] * y + -1.0), $MachinePrecision] * y + 1.0), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[x, 0.94], N[(1.0 / x), $MachinePrecision], N[(1.0 / N[(N[(N[(N[(N[(N[(t$95$0 + 0.16666666666666666), $MachinePrecision] - N[(0.5 / x), $MachinePrecision]), $MachinePrecision] * y + N[(0.5 - N[(0.5 / x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] * y + 1.0), $MachinePrecision] * y + 1.0), $MachinePrecision] * x), $MachinePrecision]), $MachinePrecision]]]]

Derivation

1. Split input into 3 regimes

2. if x < -0.75

   1. Initial program 68.9%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

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

      1. +-commutative N/A

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

      2. *-commutative N/A

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

      3. lower-fma.f64 N/A

         \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(y \cdot \left(\frac{1}{2} + \left(-1 \cdot \left(y \cdot \left(\frac{1}{6} + \left(\frac{1}{3} \cdot \frac{1}{{x}^{2}} + \frac{1}{2} \cdot \frac{1}{x}\right)\right)\right) + \frac{1}{2} \cdot \frac{1}{x}\right)\right) - 1, y, 1\right)}}{x} \]

   5. Applied rewrites 77.2%

      \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\left(0.16666666666666666 + \frac{0.5}{x}\right) + \frac{0.3333333333333333}{x \cdot x}, -y, \frac{0.5}{x} + 0.5\right), y, -1\right), y, 1\right)}}{x} \]

   if -0.75 < x < 0.93999999999999995

   1. Initial program 71.6%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \frac{\color{blue}{1}}{x} \]
   4. Step-by-step derivation

   5. Applied rewrites 98.2%

      \[\leadsto \frac{\color{blue}{1}}{x} \]

   if 0.93999999999999995 < x

   1. Initial program 73.3%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

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

      2. clear-num N/A

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

      3. lower-/.f64 N/A

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

      4. clear-num N/A

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

      5. associate-/r/ N/A

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

      6. lower-*.f64 N/A

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

   4. Applied rewrites 73.3%

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

   5. Taylor expanded in y around 0

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

      1. +-commutative N/A

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

      2. *-commutative N/A

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

      3. lower-fma.f64 N/A

         \[\leadsto \frac{1}{\color{blue}{\mathsf{fma}\left(1 + y \cdot \left(\left(\frac{1}{2} + y \cdot \left(\left(\frac{1}{6} + \frac{1}{3} \cdot \frac{1}{{x}^{2}}\right) - \frac{1}{2} \cdot \frac{1}{x}\right)\right) - \frac{1}{2} \cdot \frac{1}{x}\right), y, 1\right)} \cdot x} \]

   7. Applied rewrites 78.7%

      \[\leadsto \frac{1}{\color{blue}{\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\left(\frac{0.3333333333333333}{x \cdot x} + 0.16666666666666666\right) - \frac{0.5}{x}, y, 0.5 - \frac{0.5}{x}\right), y, 1\right), y, 1\right)} \cdot x} \]
3. Recombined 3 regimes into one program.

4. Final simplification 87.4%

   \[\leadsto \begin{array}{l} \mathbf{if}\;x \leq -0.75:\\ \;\;\;\;\frac{\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{0.3333333333333333}{x \cdot x} + \left(\frac{0.5}{x} + 0.16666666666666666\right), -y, \frac{0.5}{x} + 0.5\right), y, -1\right), y, 1\right)}{x}\\ \mathbf{elif}\;x \leq 0.94:\\ \;\;\;\;\frac{1}{x}\\ \mathbf{else}:\\ \;\;\;\;\frac{1}{\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\left(\frac{0.3333333333333333}{x \cdot x} + 0.16666666666666666\right) - \frac{0.5}{x}, y, 0.5 - \frac{0.5}{x}\right), y, 1\right), y, 1\right) \cdot x}\\ \end{array} \]
5. Add Preprocessing

Alternative 3: 86.0% accurate, 2.7× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq -0.75:\\ \;\;\;\;\frac{\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{0.3333333333333333}{x \cdot x} + \left(\frac{0.5}{x} + 0.16666666666666666\right), -y, \frac{0.5}{x} + 0.5\right), y, -1\right), y, 1\right)}{x}\\ \mathbf{elif}\;x \leq 1:\\ \;\;\;\;\frac{1}{x}\\ \mathbf{else}:\\ \;\;\;\;\frac{1}{\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(0.5, y, 1\right), x, -0.5 \cdot y\right), y, x\right)}\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= x -0.75)
   (/
    (fma
     (fma
      (fma
       (+ (/ 0.3333333333333333 (* x x)) (+ (/ 0.5 x) 0.16666666666666666))
       (- y)
       (+ (/ 0.5 x) 0.5))
      y
      -1.0)
     y
     1.0)
    x)
   (if (<= x 1.0)
     (/ 1.0 x)
     (/ 1.0 (fma (fma (fma 0.5 y 1.0) x (* -0.5 y)) y x)))))

C

double code(double x, double y) {
	double tmp;
	if (x <= -0.75) {
		tmp = fma(fma(fma(((0.3333333333333333 / (x * x)) + ((0.5 / x) + 0.16666666666666666)), -y, ((0.5 / x) + 0.5)), y, -1.0), y, 1.0) / x;
	} else if (x <= 1.0) {
		tmp = 1.0 / x;
	} else {
		tmp = 1.0 / fma(fma(fma(0.5, y, 1.0), x, (-0.5 * y)), y, x);
	}
	return tmp;
}

Julia

function code(x, y)
	tmp = 0.0
	if (x <= -0.75)
		tmp = Float64(fma(fma(fma(Float64(Float64(0.3333333333333333 / Float64(x * x)) + Float64(Float64(0.5 / x) + 0.16666666666666666)), Float64(-y), Float64(Float64(0.5 / x) + 0.5)), y, -1.0), y, 1.0) / x);
	elseif (x <= 1.0)
		tmp = Float64(1.0 / x);
	else
		tmp = Float64(1.0 / fma(fma(fma(0.5, y, 1.0), x, Float64(-0.5 * y)), y, x));
	end
	return tmp
end

Wolfram

code[x_, y_] := If[LessEqual[x, -0.75], N[(N[(N[(N[(N[(N[(0.3333333333333333 / N[(x * x), $MachinePrecision]), $MachinePrecision] + N[(N[(0.5 / x), $MachinePrecision] + 0.16666666666666666), $MachinePrecision]), $MachinePrecision] * (-y) + N[(N[(0.5 / x), $MachinePrecision] + 0.5), $MachinePrecision]), $MachinePrecision] * y + -1.0), $MachinePrecision] * y + 1.0), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[x, 1.0], N[(1.0 / x), $MachinePrecision], N[(1.0 / N[(N[(N[(0.5 * y + 1.0), $MachinePrecision] * x + N[(-0.5 * y), $MachinePrecision]), $MachinePrecision] * y + x), $MachinePrecision]), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if x < -0.75

   1. Initial program 68.9%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

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

      1. +-commutative N/A

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

      2. *-commutative N/A

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

      3. lower-fma.f64 N/A

         \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(y \cdot \left(\frac{1}{2} + \left(-1 \cdot \left(y \cdot \left(\frac{1}{6} + \left(\frac{1}{3} \cdot \frac{1}{{x}^{2}} + \frac{1}{2} \cdot \frac{1}{x}\right)\right)\right) + \frac{1}{2} \cdot \frac{1}{x}\right)\right) - 1, y, 1\right)}}{x} \]

   5. Applied rewrites 77.2%

      \[\leadsto \frac{\color{blue}{\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\left(0.16666666666666666 + \frac{0.5}{x}\right) + \frac{0.3333333333333333}{x \cdot x}, -y, \frac{0.5}{x} + 0.5\right), y, -1\right), y, 1\right)}}{x} \]

   if -0.75 < x < 1

   1. Initial program 71.6%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \frac{\color{blue}{1}}{x} \]
   4. Step-by-step derivation

   5. Applied rewrites 98.2%

      \[\leadsto \frac{\color{blue}{1}}{x} \]

   if 1 < x

   1. Initial program 73.3%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

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

      2. clear-num N/A

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

      3. lower-/.f64 N/A

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

      4. clear-num N/A

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

      5. associate-/r/ N/A

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

      6. lower-*.f64 N/A

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

   4. Applied rewrites 73.3%

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

   5. Taylor expanded in y around 0

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

      1. +-commutative N/A

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

      2. *-commutative N/A

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

      3. +-commutative N/A

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

      4. associate-*r* N/A

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

      5. *-commutative N/A

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

      6. associate-*r* N/A

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

      7. lower-fma.f64 N/A

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

   7. Applied rewrites 76.4%

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

   8. Taylor expanded in x around 0

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

   10. Applied rewrites 76.4%

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

4. Final simplification 86.7%

   \[\leadsto \begin{array}{l} \mathbf{if}\;x \leq -0.75:\\ \;\;\;\;\frac{\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(\frac{0.3333333333333333}{x \cdot x} + \left(\frac{0.5}{x} + 0.16666666666666666\right), -y, \frac{0.5}{x} + 0.5\right), y, -1\right), y, 1\right)}{x}\\ \mathbf{elif}\;x \leq 1:\\ \;\;\;\;\frac{1}{x}\\ \mathbf{else}:\\ \;\;\;\;\frac{1}{\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(0.5, y, 1\right), x, -0.5 \cdot y\right), y, x\right)}\\ \end{array} \]
5. Add Preprocessing

Alternative 4: 84.7% accurate, 4.9× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq -0.48:\\ \;\;\;\;\frac{\frac{x - y \cdot x}{x}}{x}\\ \mathbf{elif}\;x \leq 1:\\ \;\;\;\;\frac{1}{x}\\ \mathbf{else}:\\ \;\;\;\;\frac{1}{\mathsf{fma}\left(\mathsf{fma}\left(\mathsf{fma}\left(0.5, y, 1\right), x, -0.5 \cdot y\right), y, x\right)}\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= x -0.48)
   (/ (/ (- x (* y x)) x) x)
   (if (<= x 1.0)
     (/ 1.0 x)
     (/ 1.0 (fma (fma (fma 0.5 y 1.0) x (* -0.5 y)) y x)))))

C

double code(double x, double y) {
	double tmp;
	if (x <= -0.48) {
		tmp = ((x - (y * x)) / x) / x;
	} else if (x <= 1.0) {
		tmp = 1.0 / x;
	} else {
		tmp = 1.0 / fma(fma(fma(0.5, y, 1.0), x, (-0.5 * y)), y, x);
	}
	return tmp;
}

Julia

function code(x, y)
	tmp = 0.0
	if (x <= -0.48)
		tmp = Float64(Float64(Float64(x - Float64(y * x)) / x) / x);
	elseif (x <= 1.0)
		tmp = Float64(1.0 / x);
	else
		tmp = Float64(1.0 / fma(fma(fma(0.5, y, 1.0), x, Float64(-0.5 * y)), y, x));
	end
	return tmp
end

Wolfram

code[x_, y_] := If[LessEqual[x, -0.48], N[(N[(N[(x - N[(y * x), $MachinePrecision]), $MachinePrecision] / x), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[x, 1.0], N[(1.0 / x), $MachinePrecision], N[(1.0 / N[(N[(N[(0.5 * y + 1.0), $MachinePrecision] * x + N[(-0.5 * y), $MachinePrecision]), $MachinePrecision] * y + x), $MachinePrecision]), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if x < -0.47999999999999998

   1. Initial program 68.9%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \color{blue}{-1 \cdot \frac{y}{x} + \frac{1}{x}} \]
   4. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto \color{blue}{\frac{1}{x} + -1 \cdot \frac{y}{x}} \]

      2. mul-1-neg N/A

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

      3. unsub-neg N/A

         \[\leadsto \color{blue}{\frac{1}{x} - \frac{y}{x}} \]

      4. lower--.f64 N/A

         \[\leadsto \color{blue}{\frac{1}{x} - \frac{y}{x}} \]

      5. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{1}{x}} - \frac{y}{x} \]

      6. lower-/.f64 54.9

         \[\leadsto \frac{1}{x} - \color{blue}{\frac{y}{x}} \]

   5. Applied rewrites 54.9%

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

   7. Applied rewrites 75.3%

      \[\leadsto \frac{\frac{x - y \cdot x}{x}}{\color{blue}{x}} \]

   if -0.47999999999999998 < x < 1

   1. Initial program 71.6%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \frac{\color{blue}{1}}{x} \]
   4. Step-by-step derivation

   5. Applied rewrites 98.2%

      \[\leadsto \frac{\color{blue}{1}}{x} \]

   if 1 < x

   1. Initial program 73.3%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

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

      2. clear-num N/A

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

      3. lower-/.f64 N/A

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

      4. clear-num N/A

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

      5. associate-/r/ N/A

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

      6. lower-*.f64 N/A

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

   4. Applied rewrites 73.3%

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

   5. Taylor expanded in y around 0

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

      1. +-commutative N/A

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

      2. *-commutative N/A

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

      3. +-commutative N/A

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

      4. associate-*r* N/A

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

      5. *-commutative N/A

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

      6. associate-*r* N/A

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

      7. lower-fma.f64 N/A

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

   7. Applied rewrites 76.4%

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

   8. Taylor expanded in x around 0

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

   10. Applied rewrites 76.4%

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

Alternative 5: 84.7% accurate, 5.6× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq -0.48:\\ \;\;\;\;\frac{\frac{x - y \cdot x}{x}}{x}\\ \mathbf{elif}\;x \leq 0.68:\\ \;\;\;\;\frac{1}{x}\\ \mathbf{else}:\\ \;\;\;\;\frac{1}{\mathsf{fma}\left(\mathsf{fma}\left(0.5, y, 1\right) \cdot x, y, x\right)}\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= x -0.48)
   (/ (/ (- x (* y x)) x) x)
   (if (<= x 0.68) (/ 1.0 x) (/ 1.0 (fma (* (fma 0.5 y 1.0) x) y x)))))

C

double code(double x, double y) {
	double tmp;
	if (x <= -0.48) {
		tmp = ((x - (y * x)) / x) / x;
	} else if (x <= 0.68) {
		tmp = 1.0 / x;
	} else {
		tmp = 1.0 / fma((fma(0.5, y, 1.0) * x), y, x);
	}
	return tmp;
}

Julia

function code(x, y)
	tmp = 0.0
	if (x <= -0.48)
		tmp = Float64(Float64(Float64(x - Float64(y * x)) / x) / x);
	elseif (x <= 0.68)
		tmp = Float64(1.0 / x);
	else
		tmp = Float64(1.0 / fma(Float64(fma(0.5, y, 1.0) * x), y, x));
	end
	return tmp
end

Wolfram

code[x_, y_] := If[LessEqual[x, -0.48], N[(N[(N[(x - N[(y * x), $MachinePrecision]), $MachinePrecision] / x), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[x, 0.68], N[(1.0 / x), $MachinePrecision], N[(1.0 / N[(N[(N[(0.5 * y + 1.0), $MachinePrecision] * x), $MachinePrecision] * y + x), $MachinePrecision]), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if x < -0.47999999999999998

   1. Initial program 68.9%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \color{blue}{-1 \cdot \frac{y}{x} + \frac{1}{x}} \]
   4. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto \color{blue}{\frac{1}{x} + -1 \cdot \frac{y}{x}} \]

      2. mul-1-neg N/A

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

      3. unsub-neg N/A

         \[\leadsto \color{blue}{\frac{1}{x} - \frac{y}{x}} \]

      4. lower--.f64 N/A

         \[\leadsto \color{blue}{\frac{1}{x} - \frac{y}{x}} \]

      5. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{1}{x}} - \frac{y}{x} \]

      6. lower-/.f64 54.9

         \[\leadsto \frac{1}{x} - \color{blue}{\frac{y}{x}} \]

   5. Applied rewrites 54.9%

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

   7. Applied rewrites 75.3%

      \[\leadsto \frac{\frac{x - y \cdot x}{x}}{\color{blue}{x}} \]

   if -0.47999999999999998 < x < 0.680000000000000049

   1. Initial program 71.6%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \frac{\color{blue}{1}}{x} \]
   4. Step-by-step derivation

   5. Applied rewrites 98.2%

      \[\leadsto \frac{\color{blue}{1}}{x} \]

   if 0.680000000000000049 < x

   1. Initial program 73.3%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

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

      2. clear-num N/A

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

      3. lower-/.f64 N/A

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

      4. clear-num N/A

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

      5. associate-/r/ N/A

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

      6. lower-*.f64 N/A

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

   4. Applied rewrites 73.3%

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

   5. Taylor expanded in y around 0

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

      1. +-commutative N/A

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

      2. *-commutative N/A

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

      3. +-commutative N/A

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

      4. associate-*r* N/A

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

      5. *-commutative N/A

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

      6. associate-*r* N/A

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

      7. lower-fma.f64 N/A

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

   7. Applied rewrites 76.4%

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

   8. Taylor expanded in x around inf

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

   10. Applied rewrites 76.3%

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

Alternative 6: 84.8% accurate, 5.6× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq -0.75:\\ \;\;\;\;\frac{\mathsf{fma}\left(\mathsf{fma}\left(0.5, y, -1\right), y, 1\right)}{x}\\ \mathbf{elif}\;x \leq 0.68:\\ \;\;\;\;\frac{1}{x}\\ \mathbf{else}:\\ \;\;\;\;\frac{1}{\mathsf{fma}\left(\mathsf{fma}\left(0.5, y, 1\right) \cdot x, y, x\right)}\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= x -0.75)
   (/ (fma (fma 0.5 y -1.0) y 1.0) x)
   (if (<= x 0.68) (/ 1.0 x) (/ 1.0 (fma (* (fma 0.5 y 1.0) x) y x)))))

C

double code(double x, double y) {
	double tmp;
	if (x <= -0.75) {
		tmp = fma(fma(0.5, y, -1.0), y, 1.0) / x;
	} else if (x <= 0.68) {
		tmp = 1.0 / x;
	} else {
		tmp = 1.0 / fma((fma(0.5, y, 1.0) * x), y, x);
	}
	return tmp;
}

Julia

function code(x, y)
	tmp = 0.0
	if (x <= -0.75)
		tmp = Float64(fma(fma(0.5, y, -1.0), y, 1.0) / x);
	elseif (x <= 0.68)
		tmp = Float64(1.0 / x);
	else
		tmp = Float64(1.0 / fma(Float64(fma(0.5, y, 1.0) * x), y, x));
	end
	return tmp
end

Wolfram

code[x_, y_] := If[LessEqual[x, -0.75], N[(N[(N[(0.5 * y + -1.0), $MachinePrecision] * y + 1.0), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[x, 0.68], N[(1.0 / x), $MachinePrecision], N[(1.0 / N[(N[(N[(0.5 * y + 1.0), $MachinePrecision] * x), $MachinePrecision] * y + x), $MachinePrecision]), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if x < -0.75

   1. Initial program 68.9%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

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

      1. *-commutative N/A

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

      2. lower-fma.f64 N/A

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

   5. Applied rewrites 61.5%

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

   6. Taylor expanded in x around inf

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

   8. Applied rewrites 67.6%

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

   if -0.75 < x < 0.680000000000000049

   1. Initial program 71.6%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \frac{\color{blue}{1}}{x} \]
   4. Step-by-step derivation

   5. Applied rewrites 98.2%

      \[\leadsto \frac{\color{blue}{1}}{x} \]

   if 0.680000000000000049 < x

   1. Initial program 73.3%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

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

      2. clear-num N/A

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

      3. lower-/.f64 N/A

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

      4. clear-num N/A

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

      5. associate-/r/ N/A

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

      6. lower-*.f64 N/A

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

   4. Applied rewrites 73.3%

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

   5. Taylor expanded in y around 0

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

      1. +-commutative N/A

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

      2. *-commutative N/A

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

      3. +-commutative N/A

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

      4. associate-*r* N/A

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

      5. *-commutative N/A

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

      6. associate-*r* N/A

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

      7. lower-fma.f64 N/A

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

   7. Applied rewrites 76.4%

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

   8. Taylor expanded in x around inf

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

   10. Applied rewrites 76.3%

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

Alternative 7: 84.8% accurate, 5.6× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq -0.75:\\ \;\;\;\;\frac{\mathsf{fma}\left(\mathsf{fma}\left(0.5, y, -1\right), y, 1\right)}{x}\\ \mathbf{elif}\;x \leq 0.68:\\ \;\;\;\;\frac{1}{x}\\ \mathbf{else}:\\ \;\;\;\;\frac{1}{\mathsf{fma}\left(\mathsf{fma}\left(0.5, y, 1\right), y, 1\right) \cdot x}\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= x -0.75)
   (/ (fma (fma 0.5 y -1.0) y 1.0) x)
   (if (<= x 0.68) (/ 1.0 x) (/ 1.0 (* (fma (fma 0.5 y 1.0) y 1.0) x)))))

C

double code(double x, double y) {
	double tmp;
	if (x <= -0.75) {
		tmp = fma(fma(0.5, y, -1.0), y, 1.0) / x;
	} else if (x <= 0.68) {
		tmp = 1.0 / x;
	} else {
		tmp = 1.0 / (fma(fma(0.5, y, 1.0), y, 1.0) * x);
	}
	return tmp;
}

Julia

function code(x, y)
	tmp = 0.0
	if (x <= -0.75)
		tmp = Float64(fma(fma(0.5, y, -1.0), y, 1.0) / x);
	elseif (x <= 0.68)
		tmp = Float64(1.0 / x);
	else
		tmp = Float64(1.0 / Float64(fma(fma(0.5, y, 1.0), y, 1.0) * x));
	end
	return tmp
end

Wolfram

code[x_, y_] := If[LessEqual[x, -0.75], N[(N[(N[(0.5 * y + -1.0), $MachinePrecision] * y + 1.0), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[x, 0.68], N[(1.0 / x), $MachinePrecision], N[(1.0 / N[(N[(N[(0.5 * y + 1.0), $MachinePrecision] * y + 1.0), $MachinePrecision] * x), $MachinePrecision]), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if x < -0.75

   1. Initial program 68.9%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

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

      1. *-commutative N/A

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

      2. lower-fma.f64 N/A

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

   5. Applied rewrites 61.5%

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

   6. Taylor expanded in x around inf

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

   8. Applied rewrites 67.6%

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

   if -0.75 < x < 0.680000000000000049

   1. Initial program 71.6%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \frac{\color{blue}{1}}{x} \]
   4. Step-by-step derivation

   5. Applied rewrites 98.2%

      \[\leadsto \frac{\color{blue}{1}}{x} \]

   if 0.680000000000000049 < x

   1. Initial program 73.3%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

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

      2. clear-num N/A

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

      3. lower-/.f64 N/A

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

      4. clear-num N/A

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

      5. associate-/r/ N/A

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

      6. lower-*.f64 N/A

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

   4. Applied rewrites 73.3%

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

   5. Taylor expanded in y around 0

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

      1. +-commutative N/A

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

      2. *-commutative N/A

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

      3. +-commutative N/A

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

      4. associate-*r* N/A

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

      5. *-commutative N/A

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

      6. associate-*r* N/A

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

      7. lower-fma.f64 N/A

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

   7. Applied rewrites 76.4%

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

   8. Taylor expanded in x around inf

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

   10. Applied rewrites 76.3%

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

Alternative 8: 82.6% accurate, 7.7× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq -0.75:\\ \;\;\;\;\frac{\mathsf{fma}\left(\mathsf{fma}\left(0.5, y, -1\right), y, 1\right)}{x}\\ \mathbf{elif}\;x \leq 0.445:\\ \;\;\;\;\frac{1}{x}\\ \mathbf{else}:\\ \;\;\;\;\frac{1}{\mathsf{fma}\left(y, x, x\right)}\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= x -0.75)
   (/ (fma (fma 0.5 y -1.0) y 1.0) x)
   (if (<= x 0.445) (/ 1.0 x) (/ 1.0 (fma y x x)))))

C

double code(double x, double y) {
	double tmp;
	if (x <= -0.75) {
		tmp = fma(fma(0.5, y, -1.0), y, 1.0) / x;
	} else if (x <= 0.445) {
		tmp = 1.0 / x;
	} else {
		tmp = 1.0 / fma(y, x, x);
	}
	return tmp;
}

Julia

function code(x, y)
	tmp = 0.0
	if (x <= -0.75)
		tmp = Float64(fma(fma(0.5, y, -1.0), y, 1.0) / x);
	elseif (x <= 0.445)
		tmp = Float64(1.0 / x);
	else
		tmp = Float64(1.0 / fma(y, x, x));
	end
	return tmp
end

Wolfram

code[x_, y_] := If[LessEqual[x, -0.75], N[(N[(N[(0.5 * y + -1.0), $MachinePrecision] * y + 1.0), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[x, 0.445], N[(1.0 / x), $MachinePrecision], N[(1.0 / N[(y * x + x), $MachinePrecision]), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if x < -0.75

   1. Initial program 68.9%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

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

      1. *-commutative N/A

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

      2. lower-fma.f64 N/A

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

   5. Applied rewrites 61.5%

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

   6. Taylor expanded in x around inf

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

   8. Applied rewrites 67.6%

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

   if -0.75 < x < 0.445000000000000007

   1. Initial program 71.6%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \frac{\color{blue}{1}}{x} \]
   4. Step-by-step derivation

   5. Applied rewrites 98.2%

      \[\leadsto \frac{\color{blue}{1}}{x} \]

   if 0.445000000000000007 < x

   1. Initial program 73.3%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

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

      2. clear-num N/A

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

      3. lower-/.f64 N/A

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

      4. clear-num N/A

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

      5. associate-/r/ N/A

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

      6. lower-*.f64 N/A

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

   4. Applied rewrites 73.3%

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

   5. Taylor expanded in y around 0

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

      1. +-commutative N/A

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

      2. *-commutative N/A

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

      3. lower-fma.f64 70.1

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

   7. Applied rewrites 70.1%

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

Alternative 9: 82.4% accurate, 7.7× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq -0.82:\\ \;\;\;\;\frac{\mathsf{fma}\left(0.5 \cdot y, y, 1\right)}{x}\\ \mathbf{elif}\;x \leq 0.445:\\ \;\;\;\;\frac{1}{x}\\ \mathbf{else}:\\ \;\;\;\;\frac{1}{\mathsf{fma}\left(y, x, x\right)}\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= x -0.82)
   (/ (fma (* 0.5 y) y 1.0) x)
   (if (<= x 0.445) (/ 1.0 x) (/ 1.0 (fma y x x)))))

C

double code(double x, double y) {
	double tmp;
	if (x <= -0.82) {
		tmp = fma((0.5 * y), y, 1.0) / x;
	} else if (x <= 0.445) {
		tmp = 1.0 / x;
	} else {
		tmp = 1.0 / fma(y, x, x);
	}
	return tmp;
}

Julia

function code(x, y)
	tmp = 0.0
	if (x <= -0.82)
		tmp = Float64(fma(Float64(0.5 * y), y, 1.0) / x);
	elseif (x <= 0.445)
		tmp = Float64(1.0 / x);
	else
		tmp = Float64(1.0 / fma(y, x, x));
	end
	return tmp
end

Wolfram

code[x_, y_] := If[LessEqual[x, -0.82], N[(N[(N[(0.5 * y), $MachinePrecision] * y + 1.0), $MachinePrecision] / x), $MachinePrecision], If[LessEqual[x, 0.445], N[(1.0 / x), $MachinePrecision], N[(1.0 / N[(y * x + x), $MachinePrecision]), $MachinePrecision]]]

Derivation

1. Split input into 3 regimes

2. if x < -0.819999999999999951

   1. Initial program 68.9%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

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

      1. *-commutative N/A

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

      2. lower-fma.f64 N/A

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

   5. Applied rewrites 61.5%

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

   6. Taylor expanded in x around inf

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

   8. Applied rewrites 67.6%

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

   9. Taylor expanded in y around inf

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

   11. Applied rewrites 67.1%

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

   if -0.819999999999999951 < x < 0.445000000000000007

   1. Initial program 71.6%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \frac{\color{blue}{1}}{x} \]
   4. Step-by-step derivation

   5. Applied rewrites 98.2%

      \[\leadsto \frac{\color{blue}{1}}{x} \]

   if 0.445000000000000007 < x

   1. Initial program 73.3%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

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

      2. clear-num N/A

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

      3. lower-/.f64 N/A

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

      4. clear-num N/A

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

      5. associate-/r/ N/A

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

      6. lower-*.f64 N/A

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

   4. Applied rewrites 73.3%

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

   5. Taylor expanded in y around 0

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

      1. +-commutative N/A

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

      2. *-commutative N/A

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

      3. lower-fma.f64 70.1

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

   7. Applied rewrites 70.1%

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

Alternative 10: 78.3% accurate, 9.6× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq 0.445:\\ \;\;\;\;\frac{1}{x}\\ \mathbf{else}:\\ \;\;\;\;\frac{1}{\mathsf{fma}\left(y, x, x\right)}\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= x 0.445) (/ 1.0 x) (/ 1.0 (fma y x x))))

C

double code(double x, double y) {
	double tmp;
	if (x <= 0.445) {
		tmp = 1.0 / x;
	} else {
		tmp = 1.0 / fma(y, x, x);
	}
	return tmp;
}

Julia

function code(x, y)
	tmp = 0.0
	if (x <= 0.445)
		tmp = Float64(1.0 / x);
	else
		tmp = Float64(1.0 / fma(y, x, x));
	end
	return tmp
end

Wolfram

code[x_, y_] := If[LessEqual[x, 0.445], N[(1.0 / x), $MachinePrecision], N[(1.0 / N[(y * x + x), $MachinePrecision]), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if x < 0.445000000000000007

   1. Initial program 70.7%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

      \[\leadsto \frac{\color{blue}{1}}{x} \]
   4. Step-by-step derivation

   5. Applied rewrites 83.3%

      \[\leadsto \frac{\color{blue}{1}}{x} \]

   if 0.445000000000000007 < x

   1. Initial program 73.3%

      \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-/.f64 N/A

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

      2. clear-num N/A

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

      3. lower-/.f64 N/A

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

      4. clear-num N/A

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

      5. associate-/r/ N/A

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

      6. lower-*.f64 N/A

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

   4. Applied rewrites 73.3%

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

   5. Taylor expanded in y around 0

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

      1. +-commutative N/A

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

      2. *-commutative N/A

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

      3. lower-fma.f64 70.1

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

   7. Applied rewrites 70.1%

      \[\leadsto \frac{1}{\color{blue}{\mathsf{fma}\left(y, x, x\right)}} \]
3. Recombined 2 regimes into one program.
4. Add Preprocessing

Alternative 11: 74.3% accurate, 19.3× speedup

Math

\[\begin{array}{l} \\ \frac{1}{x} \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (/ 1.0 x))

C

double code(double x, double y) {
	return 1.0 / x;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = 1.0d0 / x
end function

Java

public static double code(double x, double y) {
	return 1.0 / x;
}

Python

def code(x, y):
	return 1.0 / x

Julia

function code(x, y)
	return Float64(1.0 / x)
end

MATLAB

function tmp = code(x, y)
	tmp = 1.0 / x;
end

Wolfram

code[x_, y_] := N[(1.0 / x), $MachinePrecision]

Derivation

1. Initial program 71.4%

   \[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
2. Add Preprocessing

3. Taylor expanded in y around 0

   \[\leadsto \frac{\color{blue}{1}}{x} \]
4. Step-by-step derivation

5. Applied rewrites 75.8%

   \[\leadsto \frac{\color{blue}{1}}{x} \]
6. Add Preprocessing

Developer Target 1: 77.5% accurate, 0.7× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{e^{\frac{-1}{y}}}{x}\\ t_1 := \frac{{\left(\frac{x}{y + x}\right)}^{x}}{x}\\ \mathbf{if}\;y < -3.7311844206647956 \cdot 10^{+94}:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;y < 2.817959242728288 \cdot 10^{+37}:\\ \;\;\;\;t\_1\\ \mathbf{elif}\;y < 2.347387415166998 \cdot 10^{+178}:\\ \;\;\;\;\log \left(e^{t\_1}\right)\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (let* ((t_0 (/ (exp (/ -1.0 y)) x)) (t_1 (/ (pow (/ x (+ y x)) x) x)))
   (if (< y -3.7311844206647956e+94)
     t_0
     (if (< y 2.817959242728288e+37)
       t_1
       (if (< y 2.347387415166998e+178) (log (exp t_1)) t_0)))))

C

double code(double x, double y) {
	double t_0 = exp((-1.0 / y)) / x;
	double t_1 = pow((x / (y + x)), x) / x;
	double tmp;
	if (y < -3.7311844206647956e+94) {
		tmp = t_0;
	} else if (y < 2.817959242728288e+37) {
		tmp = t_1;
	} else if (y < 2.347387415166998e+178) {
		tmp = log(exp(t_1));
	} else {
		tmp = t_0;
	}
	return tmp;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: t_0
    real(8) :: t_1
    real(8) :: tmp
    t_0 = exp(((-1.0d0) / y)) / x
    t_1 = ((x / (y + x)) ** x) / x
    if (y < (-3.7311844206647956d+94)) then
        tmp = t_0
    else if (y < 2.817959242728288d+37) then
        tmp = t_1
    else if (y < 2.347387415166998d+178) then
        tmp = log(exp(t_1))
    else
        tmp = t_0
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double t_0 = Math.exp((-1.0 / y)) / x;
	double t_1 = Math.pow((x / (y + x)), x) / x;
	double tmp;
	if (y < -3.7311844206647956e+94) {
		tmp = t_0;
	} else if (y < 2.817959242728288e+37) {
		tmp = t_1;
	} else if (y < 2.347387415166998e+178) {
		tmp = Math.log(Math.exp(t_1));
	} else {
		tmp = t_0;
	}
	return tmp;
}

Python

def code(x, y):
	t_0 = math.exp((-1.0 / y)) / x
	t_1 = math.pow((x / (y + x)), x) / x
	tmp = 0
	if y < -3.7311844206647956e+94:
		tmp = t_0
	elif y < 2.817959242728288e+37:
		tmp = t_1
	elif y < 2.347387415166998e+178:
		tmp = math.log(math.exp(t_1))
	else:
		tmp = t_0
	return tmp

Julia

function code(x, y)
	t_0 = Float64(exp(Float64(-1.0 / y)) / x)
	t_1 = Float64((Float64(x / Float64(y + x)) ^ x) / x)
	tmp = 0.0
	if (y < -3.7311844206647956e+94)
		tmp = t_0;
	elseif (y < 2.817959242728288e+37)
		tmp = t_1;
	elseif (y < 2.347387415166998e+178)
		tmp = log(exp(t_1));
	else
		tmp = t_0;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	t_0 = exp((-1.0 / y)) / x;
	t_1 = ((x / (y + x)) ^ x) / x;
	tmp = 0.0;
	if (y < -3.7311844206647956e+94)
		tmp = t_0;
	elseif (y < 2.817959242728288e+37)
		tmp = t_1;
	elseif (y < 2.347387415166998e+178)
		tmp = log(exp(t_1));
	else
		tmp = t_0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := Block[{t$95$0 = N[(N[Exp[N[(-1.0 / y), $MachinePrecision]], $MachinePrecision] / x), $MachinePrecision]}, Block[{t$95$1 = N[(N[Power[N[(x / N[(y + x), $MachinePrecision]), $MachinePrecision], x], $MachinePrecision] / x), $MachinePrecision]}, If[Less[y, -3.7311844206647956e+94], t$95$0, If[Less[y, 2.817959242728288e+37], t$95$1, If[Less[y, 2.347387415166998e+178], N[Log[N[Exp[t$95$1], $MachinePrecision]], $MachinePrecision], t$95$0]]]]]

Reproduce

herbie shell --seed 2024235 
(FPCore (x y)
  :name "Numeric.SpecFunctions:invIncompleteBetaWorker from math-functions-0.1.5.2, F"
  :precision binary64

  :alt
  (! :herbie-platform default (if (< y -37311844206647956000000000000000000000000000000000000000000000000000000000000000000000000000000) (/ (exp (/ -1 y)) x) (if (< y 28179592427282880000000000000000000000) (/ (pow (/ x (+ y x)) x) x) (if (< y 23473874151669980000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000) (log (exp (/ (pow (/ x (+ y x)) x) x))) (/ (exp (/ -1 y)) x)))))

  (/ (exp (* x (log (/ x (+ x y))))) x))