Data.Array.Repa.Algorithms.ColorRamp:rampColorHotToCold from repa-algorithms-3.4.0.1, C

Percentage Accurate: 99.9% → 100.0%

Time: 7.1s

Alternatives: 9

Speedup: 1.5×

• 21.6% of points produce a very large (infinite) output. You may want to add a precondition.

Specification

Math

\[\begin{array}{l} \\ 1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (+ 1.0 (/ (* 4.0 (- (+ x (* y 0.25)) z)) y)))

C

double code(double x, double y, double z) {
	return 1.0 + ((4.0 * ((x + (y * 0.25)) - z)) / y);
}

Fortran

real(8) function code(x, y, z)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    code = 1.0d0 + ((4.0d0 * ((x + (y * 0.25d0)) - z)) / y)
end function

Java

public static double code(double x, double y, double z) {
	return 1.0 + ((4.0 * ((x + (y * 0.25)) - z)) / y);
}

Python

def code(x, y, z):
	return 1.0 + ((4.0 * ((x + (y * 0.25)) - z)) / y)

Julia

function code(x, y, z)
	return Float64(1.0 + Float64(Float64(4.0 * Float64(Float64(x + Float64(y * 0.25)) - z)) / y))
end

MATLAB

function tmp = code(x, y, z)
	tmp = 1.0 + ((4.0 * ((x + (y * 0.25)) - z)) / y);
end

Wolfram

code[x_, y_, z_] := N[(1.0 + N[(N[(4.0 * N[(N[(x + N[(y * 0.25), $MachinePrecision]), $MachinePrecision] - z), $MachinePrecision]), $MachinePrecision] / y), $MachinePrecision]), $MachinePrecision]

Initial Program: 99.9% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ 1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (+ 1.0 (/ (* 4.0 (- (+ x (* y 0.25)) z)) y)))

C

double code(double x, double y, double z) {
	return 1.0 + ((4.0 * ((x + (y * 0.25)) - z)) / y);
}

Fortran

real(8) function code(x, y, z)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    code = 1.0d0 + ((4.0d0 * ((x + (y * 0.25d0)) - z)) / y)
end function

Java

public static double code(double x, double y, double z) {
	return 1.0 + ((4.0 * ((x + (y * 0.25)) - z)) / y);
}

Python

def code(x, y, z):
	return 1.0 + ((4.0 * ((x + (y * 0.25)) - z)) / y)

Julia

function code(x, y, z)
	return Float64(1.0 + Float64(Float64(4.0 * Float64(Float64(x + Float64(y * 0.25)) - z)) / y))
end

MATLAB

function tmp = code(x, y, z)
	tmp = 1.0 + ((4.0 * ((x + (y * 0.25)) - z)) / y);
end

Wolfram

code[x_, y_, z_] := N[(1.0 + N[(N[(4.0 * N[(N[(x + N[(y * 0.25), $MachinePrecision]), $MachinePrecision] - z), $MachinePrecision]), $MachinePrecision] / y), $MachinePrecision]), $MachinePrecision]

Alternative 1: 100.0% accurate, 1.5× speedup

Math

\[\begin{array}{l} \\ \mathsf{fma}\left(\frac{x - z}{y}, 4, 2\right) \end{array} \]

FPCore

(FPCore (x y z) :precision binary64 (fma (/ (- x z) y) 4.0 2.0))

C

double code(double x, double y, double z) {
	return fma(((x - z) / y), 4.0, 2.0);
}

Julia

function code(x, y, z)
	return fma(Float64(Float64(x - z) / y), 4.0, 2.0)
end

Wolfram

code[x_, y_, z_] := N[(N[(N[(x - z), $MachinePrecision] / y), $MachinePrecision] * 4.0 + 2.0), $MachinePrecision]

Derivation

1. Initial program 100.0%

   \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
2. Add Preprocessing

3. Taylor expanded in y around inf

   \[\leadsto \color{blue}{2 + 4 \cdot \frac{x - z}{y}} \]
4. Step-by-step derivation

   1. +-commutative N/A

      \[\leadsto \color{blue}{4 \cdot \frac{x - z}{y} + 2} \]

   2. *-commutative N/A

      \[\leadsto \color{blue}{\frac{x - z}{y} \cdot 4} + 2 \]

   3. lower-fma.f64 N/A

      \[\leadsto \color{blue}{\mathsf{fma}\left(\frac{x - z}{y}, 4, 2\right)} \]

   4. lower-/.f64 N/A

      \[\leadsto \mathsf{fma}\left(\color{blue}{\frac{x - z}{y}}, 4, 2\right) \]

   5. lower--.f64 100.0

      \[\leadsto \mathsf{fma}\left(\frac{\color{blue}{x - z}}{y}, 4, 2\right) \]

5. Applied rewrites 100.0%

   \[\leadsto \color{blue}{\mathsf{fma}\left(\frac{x - z}{y}, 4, 2\right)} \]
6. Add Preprocessing

Alternative 2: 66.8% accurate, 0.3× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y}\\ \mathbf{if}\;t\_0 \leq -4:\\ \;\;\;\;\frac{z}{y} \cdot -4\\ \mathbf{elif}\;t\_0 \leq 2:\\ \;\;\;\;2\\ \mathbf{elif}\;t\_0 \leq 10^{+241}:\\ \;\;\;\;\frac{x}{y} \cdot 4\\ \mathbf{else}:\\ \;\;\;\;\frac{-4}{y} \cdot z\\ \end{array} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (let* ((t_0 (/ (* (- (+ (* 0.25 y) x) z) 4.0) y)))
   (if (<= t_0 -4.0)
     (* (/ z y) -4.0)
     (if (<= t_0 2.0)
       2.0
       (if (<= t_0 1e+241) (* (/ x y) 4.0) (* (/ -4.0 y) z))))))

C

double code(double x, double y, double z) {
	double t_0 = ((((0.25 * y) + x) - z) * 4.0) / y;
	double tmp;
	if (t_0 <= -4.0) {
		tmp = (z / y) * -4.0;
	} else if (t_0 <= 2.0) {
		tmp = 2.0;
	} else if (t_0 <= 1e+241) {
		tmp = (x / y) * 4.0;
	} else {
		tmp = (-4.0 / y) * z;
	}
	return tmp;
}

Fortran

real(8) function code(x, y, z)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    real(8) :: t_0
    real(8) :: tmp
    t_0 = ((((0.25d0 * y) + x) - z) * 4.0d0) / y
    if (t_0 <= (-4.0d0)) then
        tmp = (z / y) * (-4.0d0)
    else if (t_0 <= 2.0d0) then
        tmp = 2.0d0
    else if (t_0 <= 1d+241) then
        tmp = (x / y) * 4.0d0
    else
        tmp = ((-4.0d0) / y) * z
    end if
    code = tmp
end function

Java

public static double code(double x, double y, double z) {
	double t_0 = ((((0.25 * y) + x) - z) * 4.0) / y;
	double tmp;
	if (t_0 <= -4.0) {
		tmp = (z / y) * -4.0;
	} else if (t_0 <= 2.0) {
		tmp = 2.0;
	} else if (t_0 <= 1e+241) {
		tmp = (x / y) * 4.0;
	} else {
		tmp = (-4.0 / y) * z;
	}
	return tmp;
}

Python

def code(x, y, z):
	t_0 = ((((0.25 * y) + x) - z) * 4.0) / y
	tmp = 0
	if t_0 <= -4.0:
		tmp = (z / y) * -4.0
	elif t_0 <= 2.0:
		tmp = 2.0
	elif t_0 <= 1e+241:
		tmp = (x / y) * 4.0
	else:
		tmp = (-4.0 / y) * z
	return tmp

Julia

function code(x, y, z)
	t_0 = Float64(Float64(Float64(Float64(Float64(0.25 * y) + x) - z) * 4.0) / y)
	tmp = 0.0
	if (t_0 <= -4.0)
		tmp = Float64(Float64(z / y) * -4.0);
	elseif (t_0 <= 2.0)
		tmp = 2.0;
	elseif (t_0 <= 1e+241)
		tmp = Float64(Float64(x / y) * 4.0);
	else
		tmp = Float64(Float64(-4.0 / y) * z);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y, z)
	t_0 = ((((0.25 * y) + x) - z) * 4.0) / y;
	tmp = 0.0;
	if (t_0 <= -4.0)
		tmp = (z / y) * -4.0;
	elseif (t_0 <= 2.0)
		tmp = 2.0;
	elseif (t_0 <= 1e+241)
		tmp = (x / y) * 4.0;
	else
		tmp = (-4.0 / y) * z;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_, z_] := Block[{t$95$0 = N[(N[(N[(N[(N[(0.25 * y), $MachinePrecision] + x), $MachinePrecision] - z), $MachinePrecision] * 4.0), $MachinePrecision] / y), $MachinePrecision]}, If[LessEqual[t$95$0, -4.0], N[(N[(z / y), $MachinePrecision] * -4.0), $MachinePrecision], If[LessEqual[t$95$0, 2.0], 2.0, If[LessEqual[t$95$0, 1e+241], N[(N[(x / y), $MachinePrecision] * 4.0), $MachinePrecision], N[(N[(-4.0 / y), $MachinePrecision] * z), $MachinePrecision]]]]]

Derivation

1. Split input into 4 regimes

2. if (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < -4

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-+.f64 N/A

         \[\leadsto \color{blue}{1 + \frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y}} \]

      2. +-commutative N/A

         \[\leadsto \color{blue}{\frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y} + 1} \]

      3. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y}} + 1 \]

      4. clear-num N/A

         \[\leadsto \color{blue}{\frac{1}{\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}}} + 1 \]

      5. inv-pow N/A

         \[\leadsto \color{blue}{{\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{-1}} + 1 \]

      6. sqr-pow N/A

         \[\leadsto \color{blue}{{\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)} \cdot {\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}} + 1 \]

      7. lower-fma.f64 N/A

         \[\leadsto \color{blue}{\mathsf{fma}\left({\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}, {\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}, 1\right)} \]

   4. Applied rewrites 0.0%

      \[\leadsto \color{blue}{\mathsf{fma}\left({\left(\frac{y}{\left(\mathsf{fma}\left(0.25, y, x\right) - z\right) \cdot 4}\right)}^{-0.5}, {\left(\frac{y}{\left(\mathsf{fma}\left(0.25, y, x\right) - z\right) \cdot 4}\right)}^{-0.5}, 1\right)} \]

   5. Taylor expanded in z around inf

      \[\leadsto \color{blue}{-4 \cdot \frac{z}{y}} \]
   6. Step-by-step derivation

      1. *-commutative N/A

         \[\leadsto \color{blue}{\frac{z}{y} \cdot -4} \]

      2. lower-*.f64 N/A

         \[\leadsto \color{blue}{\frac{z}{y} \cdot -4} \]

      3. lower-/.f64 55.7

         \[\leadsto \color{blue}{\frac{z}{y}} \cdot -4 \]

   7. Applied rewrites 55.7%

      \[\leadsto \color{blue}{\frac{z}{y} \cdot -4} \]

   if -4 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < 2

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in y around inf

      \[\leadsto \color{blue}{2} \]
   4. Step-by-step derivation

   5. Applied rewrites 96.2%

      \[\leadsto \color{blue}{2} \]

   if 2 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < 1.0000000000000001e241

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-+.f64 N/A

         \[\leadsto \color{blue}{1 + \frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y}} \]

      2. +-commutative N/A

         \[\leadsto \color{blue}{\frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y} + 1} \]

      3. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y}} + 1 \]

      4. clear-num N/A

         \[\leadsto \color{blue}{\frac{1}{\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}}} + 1 \]

      5. inv-pow N/A

         \[\leadsto \color{blue}{{\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{-1}} + 1 \]

      6. sqr-pow N/A

         \[\leadsto \color{blue}{{\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)} \cdot {\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}} + 1 \]

      7. lower-fma.f64 N/A

         \[\leadsto \color{blue}{\mathsf{fma}\left({\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}, {\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}, 1\right)} \]

   4. Applied rewrites 99.1%

      \[\leadsto \color{blue}{\mathsf{fma}\left({\left(\frac{y}{\left(\mathsf{fma}\left(0.25, y, x\right) - z\right) \cdot 4}\right)}^{-0.5}, {\left(\frac{y}{\left(\mathsf{fma}\left(0.25, y, x\right) - z\right) \cdot 4}\right)}^{-0.5}, 1\right)} \]

   5. Taylor expanded in x around inf

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

      1. *-commutative N/A

         \[\leadsto \color{blue}{\frac{x}{y} \cdot 4} \]

      2. lower-*.f64 N/A

         \[\leadsto \color{blue}{\frac{x}{y} \cdot 4} \]

      3. lower-/.f64 58.9

         \[\leadsto \color{blue}{\frac{x}{y}} \cdot 4 \]

   7. Applied rewrites 58.9%

      \[\leadsto \color{blue}{\frac{x}{y} \cdot 4} \]

   if 1.0000000000000001e241 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y)

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in z around inf

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

      1. *-lft-identity N/A

         \[\leadsto -4 \cdot \frac{\color{blue}{1 \cdot z}}{y} \]

      2. associate-*l/ N/A

         \[\leadsto -4 \cdot \color{blue}{\left(\frac{1}{y} \cdot z\right)} \]

      3. associate-*l* N/A

         \[\leadsto \color{blue}{\left(-4 \cdot \frac{1}{y}\right) \cdot z} \]

      4. metadata-eval N/A

         \[\leadsto \left(\color{blue}{\left(\mathsf{neg}\left(4\right)\right)} \cdot \frac{1}{y}\right) \cdot z \]

      5. distribute-lft-neg-in N/A

         \[\leadsto \color{blue}{\left(\mathsf{neg}\left(4 \cdot \frac{1}{y}\right)\right)} \cdot z \]

      6. lower-*.f64 N/A

         \[\leadsto \color{blue}{\left(\mathsf{neg}\left(4 \cdot \frac{1}{y}\right)\right) \cdot z} \]

      7. associate-*r/ N/A

         \[\leadsto \left(\mathsf{neg}\left(\color{blue}{\frac{4 \cdot 1}{y}}\right)\right) \cdot z \]

      8. metadata-eval N/A

         \[\leadsto \left(\mathsf{neg}\left(\frac{\color{blue}{4}}{y}\right)\right) \cdot z \]

      9. distribute-neg-frac N/A

         \[\leadsto \color{blue}{\frac{\mathsf{neg}\left(4\right)}{y}} \cdot z \]

      10. metadata-eval N/A

          \[\leadsto \frac{\color{blue}{-4}}{y} \cdot z \]

      11. lower-/.f64 62.8

          \[\leadsto \color{blue}{\frac{-4}{y}} \cdot z \]

   5. Applied rewrites 62.8%

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

4. Final simplification 70.6%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq -4:\\ \;\;\;\;\frac{z}{y} \cdot -4\\ \mathbf{elif}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq 2:\\ \;\;\;\;2\\ \mathbf{elif}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq 10^{+241}:\\ \;\;\;\;\frac{x}{y} \cdot 4\\ \mathbf{else}:\\ \;\;\;\;\frac{-4}{y} \cdot z\\ \end{array} \]
5. Add Preprocessing

Alternative 3: 66.8% accurate, 0.3× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{-4}{y} \cdot z\\ t_1 := \frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y}\\ \mathbf{if}\;t\_1 \leq -4:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;t\_1 \leq 2:\\ \;\;\;\;2\\ \mathbf{elif}\;t\_1 \leq 10^{+241}:\\ \;\;\;\;\frac{x}{y} \cdot 4\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (let* ((t_0 (* (/ -4.0 y) z)) (t_1 (/ (* (- (+ (* 0.25 y) x) z) 4.0) y)))
   (if (<= t_1 -4.0)
     t_0
     (if (<= t_1 2.0) 2.0 (if (<= t_1 1e+241) (* (/ x y) 4.0) t_0)))))

C

double code(double x, double y, double z) {
	double t_0 = (-4.0 / y) * z;
	double t_1 = ((((0.25 * y) + x) - z) * 4.0) / y;
	double tmp;
	if (t_1 <= -4.0) {
		tmp = t_0;
	} else if (t_1 <= 2.0) {
		tmp = 2.0;
	} else if (t_1 <= 1e+241) {
		tmp = (x / y) * 4.0;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Fortran

real(8) function code(x, y, z)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    real(8) :: t_0
    real(8) :: t_1
    real(8) :: tmp
    t_0 = ((-4.0d0) / y) * z
    t_1 = ((((0.25d0 * y) + x) - z) * 4.0d0) / y
    if (t_1 <= (-4.0d0)) then
        tmp = t_0
    else if (t_1 <= 2.0d0) then
        tmp = 2.0d0
    else if (t_1 <= 1d+241) then
        tmp = (x / y) * 4.0d0
    else
        tmp = t_0
    end if
    code = tmp
end function

Java

public static double code(double x, double y, double z) {
	double t_0 = (-4.0 / y) * z;
	double t_1 = ((((0.25 * y) + x) - z) * 4.0) / y;
	double tmp;
	if (t_1 <= -4.0) {
		tmp = t_0;
	} else if (t_1 <= 2.0) {
		tmp = 2.0;
	} else if (t_1 <= 1e+241) {
		tmp = (x / y) * 4.0;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Python

def code(x, y, z):
	t_0 = (-4.0 / y) * z
	t_1 = ((((0.25 * y) + x) - z) * 4.0) / y
	tmp = 0
	if t_1 <= -4.0:
		tmp = t_0
	elif t_1 <= 2.0:
		tmp = 2.0
	elif t_1 <= 1e+241:
		tmp = (x / y) * 4.0
	else:
		tmp = t_0
	return tmp

Julia

function code(x, y, z)
	t_0 = Float64(Float64(-4.0 / y) * z)
	t_1 = Float64(Float64(Float64(Float64(Float64(0.25 * y) + x) - z) * 4.0) / y)
	tmp = 0.0
	if (t_1 <= -4.0)
		tmp = t_0;
	elseif (t_1 <= 2.0)
		tmp = 2.0;
	elseif (t_1 <= 1e+241)
		tmp = Float64(Float64(x / y) * 4.0);
	else
		tmp = t_0;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y, z)
	t_0 = (-4.0 / y) * z;
	t_1 = ((((0.25 * y) + x) - z) * 4.0) / y;
	tmp = 0.0;
	if (t_1 <= -4.0)
		tmp = t_0;
	elseif (t_1 <= 2.0)
		tmp = 2.0;
	elseif (t_1 <= 1e+241)
		tmp = (x / y) * 4.0;
	else
		tmp = t_0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_, z_] := Block[{t$95$0 = N[(N[(-4.0 / y), $MachinePrecision] * z), $MachinePrecision]}, Block[{t$95$1 = N[(N[(N[(N[(N[(0.25 * y), $MachinePrecision] + x), $MachinePrecision] - z), $MachinePrecision] * 4.0), $MachinePrecision] / y), $MachinePrecision]}, If[LessEqual[t$95$1, -4.0], t$95$0, If[LessEqual[t$95$1, 2.0], 2.0, If[LessEqual[t$95$1, 1e+241], N[(N[(x / y), $MachinePrecision] * 4.0), $MachinePrecision], t$95$0]]]]]

Derivation

1. Split input into 3 regimes

2. if (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < -4 or 1.0000000000000001e241 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y)

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in z around inf

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

      1. *-lft-identity N/A

         \[\leadsto -4 \cdot \frac{\color{blue}{1 \cdot z}}{y} \]

      2. associate-*l/ N/A

         \[\leadsto -4 \cdot \color{blue}{\left(\frac{1}{y} \cdot z\right)} \]

      3. associate-*l* N/A

         \[\leadsto \color{blue}{\left(-4 \cdot \frac{1}{y}\right) \cdot z} \]

      4. metadata-eval N/A

         \[\leadsto \left(\color{blue}{\left(\mathsf{neg}\left(4\right)\right)} \cdot \frac{1}{y}\right) \cdot z \]

      5. distribute-lft-neg-in N/A

         \[\leadsto \color{blue}{\left(\mathsf{neg}\left(4 \cdot \frac{1}{y}\right)\right)} \cdot z \]

      6. lower-*.f64 N/A

         \[\leadsto \color{blue}{\left(\mathsf{neg}\left(4 \cdot \frac{1}{y}\right)\right) \cdot z} \]

      7. associate-*r/ N/A

         \[\leadsto \left(\mathsf{neg}\left(\color{blue}{\frac{4 \cdot 1}{y}}\right)\right) \cdot z \]

      8. metadata-eval N/A

         \[\leadsto \left(\mathsf{neg}\left(\frac{\color{blue}{4}}{y}\right)\right) \cdot z \]

      9. distribute-neg-frac N/A

         \[\leadsto \color{blue}{\frac{\mathsf{neg}\left(4\right)}{y}} \cdot z \]

      10. metadata-eval N/A

          \[\leadsto \frac{\color{blue}{-4}}{y} \cdot z \]

      11. lower-/.f64 57.7

          \[\leadsto \color{blue}{\frac{-4}{y}} \cdot z \]

   5. Applied rewrites 57.7%

      \[\leadsto \color{blue}{\frac{-4}{y} \cdot z} \]

   if -4 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < 2

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in y around inf

      \[\leadsto \color{blue}{2} \]
   4. Step-by-step derivation

   5. Applied rewrites 96.2%

      \[\leadsto \color{blue}{2} \]

   if 2 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < 1.0000000000000001e241

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-+.f64 N/A

         \[\leadsto \color{blue}{1 + \frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y}} \]

      2. +-commutative N/A

         \[\leadsto \color{blue}{\frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y} + 1} \]

      3. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y}} + 1 \]

      4. clear-num N/A

         \[\leadsto \color{blue}{\frac{1}{\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}}} + 1 \]

      5. inv-pow N/A

         \[\leadsto \color{blue}{{\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{-1}} + 1 \]

      6. sqr-pow N/A

         \[\leadsto \color{blue}{{\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)} \cdot {\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}} + 1 \]

      7. lower-fma.f64 N/A

         \[\leadsto \color{blue}{\mathsf{fma}\left({\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}, {\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}, 1\right)} \]

   4. Applied rewrites 99.1%

      \[\leadsto \color{blue}{\mathsf{fma}\left({\left(\frac{y}{\left(\mathsf{fma}\left(0.25, y, x\right) - z\right) \cdot 4}\right)}^{-0.5}, {\left(\frac{y}{\left(\mathsf{fma}\left(0.25, y, x\right) - z\right) \cdot 4}\right)}^{-0.5}, 1\right)} \]

   5. Taylor expanded in x around inf

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

      1. *-commutative N/A

         \[\leadsto \color{blue}{\frac{x}{y} \cdot 4} \]

      2. lower-*.f64 N/A

         \[\leadsto \color{blue}{\frac{x}{y} \cdot 4} \]

      3. lower-/.f64 58.9

         \[\leadsto \color{blue}{\frac{x}{y}} \cdot 4 \]

   7. Applied rewrites 58.9%

      \[\leadsto \color{blue}{\frac{x}{y} \cdot 4} \]
3. Recombined 3 regimes into one program.

4. Final simplification 70.6%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq -4:\\ \;\;\;\;\frac{-4}{y} \cdot z\\ \mathbf{elif}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq 2:\\ \;\;\;\;2\\ \mathbf{elif}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq 10^{+241}:\\ \;\;\;\;\frac{x}{y} \cdot 4\\ \mathbf{else}:\\ \;\;\;\;\frac{-4}{y} \cdot z\\ \end{array} \]
5. Add Preprocessing

Alternative 4: 66.7% accurate, 0.3× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{-4}{y} \cdot z\\ t_1 := \frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y}\\ \mathbf{if}\;t\_1 \leq -4:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;t\_1 \leq 2:\\ \;\;\;\;2\\ \mathbf{elif}\;t\_1 \leq 10^{+241}:\\ \;\;\;\;\frac{4}{y} \cdot x\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (let* ((t_0 (* (/ -4.0 y) z)) (t_1 (/ (* (- (+ (* 0.25 y) x) z) 4.0) y)))
   (if (<= t_1 -4.0)
     t_0
     (if (<= t_1 2.0) 2.0 (if (<= t_1 1e+241) (* (/ 4.0 y) x) t_0)))))

C

double code(double x, double y, double z) {
	double t_0 = (-4.0 / y) * z;
	double t_1 = ((((0.25 * y) + x) - z) * 4.0) / y;
	double tmp;
	if (t_1 <= -4.0) {
		tmp = t_0;
	} else if (t_1 <= 2.0) {
		tmp = 2.0;
	} else if (t_1 <= 1e+241) {
		tmp = (4.0 / y) * x;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Fortran

real(8) function code(x, y, z)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    real(8) :: t_0
    real(8) :: t_1
    real(8) :: tmp
    t_0 = ((-4.0d0) / y) * z
    t_1 = ((((0.25d0 * y) + x) - z) * 4.0d0) / y
    if (t_1 <= (-4.0d0)) then
        tmp = t_0
    else if (t_1 <= 2.0d0) then
        tmp = 2.0d0
    else if (t_1 <= 1d+241) then
        tmp = (4.0d0 / y) * x
    else
        tmp = t_0
    end if
    code = tmp
end function

Java

public static double code(double x, double y, double z) {
	double t_0 = (-4.0 / y) * z;
	double t_1 = ((((0.25 * y) + x) - z) * 4.0) / y;
	double tmp;
	if (t_1 <= -4.0) {
		tmp = t_0;
	} else if (t_1 <= 2.0) {
		tmp = 2.0;
	} else if (t_1 <= 1e+241) {
		tmp = (4.0 / y) * x;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Python

def code(x, y, z):
	t_0 = (-4.0 / y) * z
	t_1 = ((((0.25 * y) + x) - z) * 4.0) / y
	tmp = 0
	if t_1 <= -4.0:
		tmp = t_0
	elif t_1 <= 2.0:
		tmp = 2.0
	elif t_1 <= 1e+241:
		tmp = (4.0 / y) * x
	else:
		tmp = t_0
	return tmp

Julia

function code(x, y, z)
	t_0 = Float64(Float64(-4.0 / y) * z)
	t_1 = Float64(Float64(Float64(Float64(Float64(0.25 * y) + x) - z) * 4.0) / y)
	tmp = 0.0
	if (t_1 <= -4.0)
		tmp = t_0;
	elseif (t_1 <= 2.0)
		tmp = 2.0;
	elseif (t_1 <= 1e+241)
		tmp = Float64(Float64(4.0 / y) * x);
	else
		tmp = t_0;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y, z)
	t_0 = (-4.0 / y) * z;
	t_1 = ((((0.25 * y) + x) - z) * 4.0) / y;
	tmp = 0.0;
	if (t_1 <= -4.0)
		tmp = t_0;
	elseif (t_1 <= 2.0)
		tmp = 2.0;
	elseif (t_1 <= 1e+241)
		tmp = (4.0 / y) * x;
	else
		tmp = t_0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_, z_] := Block[{t$95$0 = N[(N[(-4.0 / y), $MachinePrecision] * z), $MachinePrecision]}, Block[{t$95$1 = N[(N[(N[(N[(N[(0.25 * y), $MachinePrecision] + x), $MachinePrecision] - z), $MachinePrecision] * 4.0), $MachinePrecision] / y), $MachinePrecision]}, If[LessEqual[t$95$1, -4.0], t$95$0, If[LessEqual[t$95$1, 2.0], 2.0, If[LessEqual[t$95$1, 1e+241], N[(N[(4.0 / y), $MachinePrecision] * x), $MachinePrecision], t$95$0]]]]]

Derivation

1. Split input into 3 regimes

2. if (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < -4 or 1.0000000000000001e241 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y)

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in z around inf

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

      1. *-lft-identity N/A

         \[\leadsto -4 \cdot \frac{\color{blue}{1 \cdot z}}{y} \]

      2. associate-*l/ N/A

         \[\leadsto -4 \cdot \color{blue}{\left(\frac{1}{y} \cdot z\right)} \]

      3. associate-*l* N/A

         \[\leadsto \color{blue}{\left(-4 \cdot \frac{1}{y}\right) \cdot z} \]

      4. metadata-eval N/A

         \[\leadsto \left(\color{blue}{\left(\mathsf{neg}\left(4\right)\right)} \cdot \frac{1}{y}\right) \cdot z \]

      5. distribute-lft-neg-in N/A

         \[\leadsto \color{blue}{\left(\mathsf{neg}\left(4 \cdot \frac{1}{y}\right)\right)} \cdot z \]

      6. lower-*.f64 N/A

         \[\leadsto \color{blue}{\left(\mathsf{neg}\left(4 \cdot \frac{1}{y}\right)\right) \cdot z} \]

      7. associate-*r/ N/A

         \[\leadsto \left(\mathsf{neg}\left(\color{blue}{\frac{4 \cdot 1}{y}}\right)\right) \cdot z \]

      8. metadata-eval N/A

         \[\leadsto \left(\mathsf{neg}\left(\frac{\color{blue}{4}}{y}\right)\right) \cdot z \]

      9. distribute-neg-frac N/A

         \[\leadsto \color{blue}{\frac{\mathsf{neg}\left(4\right)}{y}} \cdot z \]

      10. metadata-eval N/A

          \[\leadsto \frac{\color{blue}{-4}}{y} \cdot z \]

      11. lower-/.f64 57.7

          \[\leadsto \color{blue}{\frac{-4}{y}} \cdot z \]

   5. Applied rewrites 57.7%

      \[\leadsto \color{blue}{\frac{-4}{y} \cdot z} \]

   if -4 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < 2

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in y around inf

      \[\leadsto \color{blue}{2} \]
   4. Step-by-step derivation

   5. Applied rewrites 96.2%

      \[\leadsto \color{blue}{2} \]

   if 2 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < 1.0000000000000001e241

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in x around inf

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

      1. *-lft-identity N/A

         \[\leadsto 4 \cdot \frac{\color{blue}{1 \cdot x}}{y} \]

      2. associate-*l/ N/A

         \[\leadsto 4 \cdot \color{blue}{\left(\frac{1}{y} \cdot x\right)} \]

      3. associate-*l* N/A

         \[\leadsto \color{blue}{\left(4 \cdot \frac{1}{y}\right) \cdot x} \]

      4. lower-*.f64 N/A

         \[\leadsto \color{blue}{\left(4 \cdot \frac{1}{y}\right) \cdot x} \]

      5. associate-*r/ N/A

         \[\leadsto \color{blue}{\frac{4 \cdot 1}{y}} \cdot x \]

      6. metadata-eval N/A

         \[\leadsto \frac{\color{blue}{4}}{y} \cdot x \]

      7. lower-/.f64 58.6

         \[\leadsto \color{blue}{\frac{4}{y}} \cdot x \]

   5. Applied rewrites 58.6%

      \[\leadsto \color{blue}{\frac{4}{y} \cdot x} \]
3. Recombined 3 regimes into one program.

4. Final simplification 70.5%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq -4:\\ \;\;\;\;\frac{-4}{y} \cdot z\\ \mathbf{elif}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq 2:\\ \;\;\;\;2\\ \mathbf{elif}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq 10^{+241}:\\ \;\;\;\;\frac{4}{y} \cdot x\\ \mathbf{else}:\\ \;\;\;\;\frac{-4}{y} \cdot z\\ \end{array} \]
5. Add Preprocessing

Alternative 5: 98.5% accurate, 0.4× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{x - z}{y} \cdot 4\\ t_1 := \frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y}\\ \mathbf{if}\;t\_1 \leq -4:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;t\_1 \leq 500:\\ \;\;\;\;\mathsf{fma}\left(\frac{x}{y}, 4, 2\right)\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (let* ((t_0 (* (/ (- x z) y) 4.0)) (t_1 (/ (* (- (+ (* 0.25 y) x) z) 4.0) y)))
   (if (<= t_1 -4.0) t_0 (if (<= t_1 500.0) (fma (/ x y) 4.0 2.0) t_0))))

C

double code(double x, double y, double z) {
	double t_0 = ((x - z) / y) * 4.0;
	double t_1 = ((((0.25 * y) + x) - z) * 4.0) / y;
	double tmp;
	if (t_1 <= -4.0) {
		tmp = t_0;
	} else if (t_1 <= 500.0) {
		tmp = fma((x / y), 4.0, 2.0);
	} else {
		tmp = t_0;
	}
	return tmp;
}

Julia

function code(x, y, z)
	t_0 = Float64(Float64(Float64(x - z) / y) * 4.0)
	t_1 = Float64(Float64(Float64(Float64(Float64(0.25 * y) + x) - z) * 4.0) / y)
	tmp = 0.0
	if (t_1 <= -4.0)
		tmp = t_0;
	elseif (t_1 <= 500.0)
		tmp = fma(Float64(x / y), 4.0, 2.0);
	else
		tmp = t_0;
	end
	return tmp
end

Wolfram

code[x_, y_, z_] := Block[{t$95$0 = N[(N[(N[(x - z), $MachinePrecision] / y), $MachinePrecision] * 4.0), $MachinePrecision]}, Block[{t$95$1 = N[(N[(N[(N[(N[(0.25 * y), $MachinePrecision] + x), $MachinePrecision] - z), $MachinePrecision] * 4.0), $MachinePrecision] / y), $MachinePrecision]}, If[LessEqual[t$95$1, -4.0], t$95$0, If[LessEqual[t$95$1, 500.0], N[(N[(x / y), $MachinePrecision] * 4.0 + 2.0), $MachinePrecision], t$95$0]]]]

Derivation

1. Split input into 2 regimes

2. if (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < -4 or 500 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y)

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

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

      1. *-commutative N/A

         \[\leadsto \color{blue}{\frac{x - z}{y} \cdot 4} \]

      2. lower-*.f64 N/A

         \[\leadsto \color{blue}{\frac{x - z}{y} \cdot 4} \]

      3. lower-/.f64 N/A

         \[\leadsto \color{blue}{\frac{x - z}{y}} \cdot 4 \]

      4. lower--.f64 99.4

         \[\leadsto \frac{\color{blue}{x - z}}{y} \cdot 4 \]

   5. Applied rewrites 99.4%

      \[\leadsto \color{blue}{\frac{x - z}{y} \cdot 4} \]

   if -4 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < 500

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in y around inf

      \[\leadsto \color{blue}{2 + 4 \cdot \frac{x - z}{y}} \]
   4. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto \color{blue}{4 \cdot \frac{x - z}{y} + 2} \]

      2. *-commutative N/A

         \[\leadsto \color{blue}{\frac{x - z}{y} \cdot 4} + 2 \]

      3. lower-fma.f64 N/A

         \[\leadsto \color{blue}{\mathsf{fma}\left(\frac{x - z}{y}, 4, 2\right)} \]

      4. lower-/.f64 N/A

         \[\leadsto \mathsf{fma}\left(\color{blue}{\frac{x - z}{y}}, 4, 2\right) \]

      5. lower--.f64 100.0

         \[\leadsto \mathsf{fma}\left(\frac{\color{blue}{x - z}}{y}, 4, 2\right) \]

   5. Applied rewrites 100.0%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\frac{x - z}{y}, 4, 2\right)} \]

   6. Taylor expanded in z around 0

      \[\leadsto \mathsf{fma}\left(\frac{x}{y}, 4, 2\right) \]
   7. Step-by-step derivation

   8. Applied rewrites 100.0%

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

4. Final simplification 99.6%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq -4:\\ \;\;\;\;\frac{x - z}{y} \cdot 4\\ \mathbf{elif}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq 500:\\ \;\;\;\;\mathsf{fma}\left(\frac{x}{y}, 4, 2\right)\\ \mathbf{else}:\\ \;\;\;\;\frac{x - z}{y} \cdot 4\\ \end{array} \]
5. Add Preprocessing

Alternative 6: 66.1% accurate, 0.4× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{-4}{y} \cdot z\\ t_1 := \frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y}\\ \mathbf{if}\;t\_1 \leq -4:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;t\_1 \leq 5 \cdot 10^{+36}:\\ \;\;\;\;2\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (let* ((t_0 (* (/ -4.0 y) z)) (t_1 (/ (* (- (+ (* 0.25 y) x) z) 4.0) y)))
   (if (<= t_1 -4.0) t_0 (if (<= t_1 5e+36) 2.0 t_0))))

C

double code(double x, double y, double z) {
	double t_0 = (-4.0 / y) * z;
	double t_1 = ((((0.25 * y) + x) - z) * 4.0) / y;
	double tmp;
	if (t_1 <= -4.0) {
		tmp = t_0;
	} else if (t_1 <= 5e+36) {
		tmp = 2.0;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Fortran

real(8) function code(x, y, z)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    real(8) :: t_0
    real(8) :: t_1
    real(8) :: tmp
    t_0 = ((-4.0d0) / y) * z
    t_1 = ((((0.25d0 * y) + x) - z) * 4.0d0) / y
    if (t_1 <= (-4.0d0)) then
        tmp = t_0
    else if (t_1 <= 5d+36) then
        tmp = 2.0d0
    else
        tmp = t_0
    end if
    code = tmp
end function

Java

public static double code(double x, double y, double z) {
	double t_0 = (-4.0 / y) * z;
	double t_1 = ((((0.25 * y) + x) - z) * 4.0) / y;
	double tmp;
	if (t_1 <= -4.0) {
		tmp = t_0;
	} else if (t_1 <= 5e+36) {
		tmp = 2.0;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Python

def code(x, y, z):
	t_0 = (-4.0 / y) * z
	t_1 = ((((0.25 * y) + x) - z) * 4.0) / y
	tmp = 0
	if t_1 <= -4.0:
		tmp = t_0
	elif t_1 <= 5e+36:
		tmp = 2.0
	else:
		tmp = t_0
	return tmp

Julia

function code(x, y, z)
	t_0 = Float64(Float64(-4.0 / y) * z)
	t_1 = Float64(Float64(Float64(Float64(Float64(0.25 * y) + x) - z) * 4.0) / y)
	tmp = 0.0
	if (t_1 <= -4.0)
		tmp = t_0;
	elseif (t_1 <= 5e+36)
		tmp = 2.0;
	else
		tmp = t_0;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y, z)
	t_0 = (-4.0 / y) * z;
	t_1 = ((((0.25 * y) + x) - z) * 4.0) / y;
	tmp = 0.0;
	if (t_1 <= -4.0)
		tmp = t_0;
	elseif (t_1 <= 5e+36)
		tmp = 2.0;
	else
		tmp = t_0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_, z_] := Block[{t$95$0 = N[(N[(-4.0 / y), $MachinePrecision] * z), $MachinePrecision]}, Block[{t$95$1 = N[(N[(N[(N[(N[(0.25 * y), $MachinePrecision] + x), $MachinePrecision] - z), $MachinePrecision] * 4.0), $MachinePrecision] / y), $MachinePrecision]}, If[LessEqual[t$95$1, -4.0], t$95$0, If[LessEqual[t$95$1, 5e+36], 2.0, t$95$0]]]]

Derivation

1. Split input into 2 regimes

2. if (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < -4 or 4.99999999999999977e36 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y)

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in z around inf

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

      1. *-lft-identity N/A

         \[\leadsto -4 \cdot \frac{\color{blue}{1 \cdot z}}{y} \]

      2. associate-*l/ N/A

         \[\leadsto -4 \cdot \color{blue}{\left(\frac{1}{y} \cdot z\right)} \]

      3. associate-*l* N/A

         \[\leadsto \color{blue}{\left(-4 \cdot \frac{1}{y}\right) \cdot z} \]

      4. metadata-eval N/A

         \[\leadsto \left(\color{blue}{\left(\mathsf{neg}\left(4\right)\right)} \cdot \frac{1}{y}\right) \cdot z \]

      5. distribute-lft-neg-in N/A

         \[\leadsto \color{blue}{\left(\mathsf{neg}\left(4 \cdot \frac{1}{y}\right)\right)} \cdot z \]

      6. lower-*.f64 N/A

         \[\leadsto \color{blue}{\left(\mathsf{neg}\left(4 \cdot \frac{1}{y}\right)\right) \cdot z} \]

      7. associate-*r/ N/A

         \[\leadsto \left(\mathsf{neg}\left(\color{blue}{\frac{4 \cdot 1}{y}}\right)\right) \cdot z \]

      8. metadata-eval N/A

         \[\leadsto \left(\mathsf{neg}\left(\frac{\color{blue}{4}}{y}\right)\right) \cdot z \]

      9. distribute-neg-frac N/A

         \[\leadsto \color{blue}{\frac{\mathsf{neg}\left(4\right)}{y}} \cdot z \]

      10. metadata-eval N/A

          \[\leadsto \frac{\color{blue}{-4}}{y} \cdot z \]

      11. lower-/.f64 54.0

          \[\leadsto \color{blue}{\frac{-4}{y}} \cdot z \]

   5. Applied rewrites 54.0%

      \[\leadsto \color{blue}{\frac{-4}{y} \cdot z} \]

   if -4 < (/.f64 (*.f64 #s(literal 4 binary64) (-.f64 (+.f64 x (*.f64 y #s(literal 1/4 binary64))) z)) y) < 4.99999999999999977e36

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in y around inf

      \[\leadsto \color{blue}{2} \]
   4. Step-by-step derivation

   5. Applied rewrites 91.4%

      \[\leadsto \color{blue}{2} \]
3. Recombined 2 regimes into one program.

4. Final simplification 67.0%

   \[\leadsto \begin{array}{l} \mathbf{if}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq -4:\\ \;\;\;\;\frac{-4}{y} \cdot z\\ \mathbf{elif}\;\frac{\left(\left(0.25 \cdot y + x\right) - z\right) \cdot 4}{y} \leq 5 \cdot 10^{+36}:\\ \;\;\;\;2\\ \mathbf{else}:\\ \;\;\;\;\frac{-4}{y} \cdot z\\ \end{array} \]
5. Add Preprocessing

Alternative 7: 87.0% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \mathsf{fma}\left(\frac{x}{y}, 4, 2\right)\\ \mathbf{if}\;x \leq -2.4 \cdot 10^{+30}:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;x \leq 1.1 \cdot 10^{+52}:\\ \;\;\;\;\mathsf{fma}\left(\frac{z}{y}, -4, 2\right)\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (let* ((t_0 (fma (/ x y) 4.0 2.0)))
   (if (<= x -2.4e+30) t_0 (if (<= x 1.1e+52) (fma (/ z y) -4.0 2.0) t_0))))

C

double code(double x, double y, double z) {
	double t_0 = fma((x / y), 4.0, 2.0);
	double tmp;
	if (x <= -2.4e+30) {
		tmp = t_0;
	} else if (x <= 1.1e+52) {
		tmp = fma((z / y), -4.0, 2.0);
	} else {
		tmp = t_0;
	}
	return tmp;
}

Julia

function code(x, y, z)
	t_0 = fma(Float64(x / y), 4.0, 2.0)
	tmp = 0.0
	if (x <= -2.4e+30)
		tmp = t_0;
	elseif (x <= 1.1e+52)
		tmp = fma(Float64(z / y), -4.0, 2.0);
	else
		tmp = t_0;
	end
	return tmp
end

Wolfram

code[x_, y_, z_] := Block[{t$95$0 = N[(N[(x / y), $MachinePrecision] * 4.0 + 2.0), $MachinePrecision]}, If[LessEqual[x, -2.4e+30], t$95$0, If[LessEqual[x, 1.1e+52], N[(N[(z / y), $MachinePrecision] * -4.0 + 2.0), $MachinePrecision], t$95$0]]]

Derivation

1. Split input into 2 regimes

2. if x < -2.3999999999999999e30 or 1.1e52 < x

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in y around inf

      \[\leadsto \color{blue}{2 + 4 \cdot \frac{x - z}{y}} \]
   4. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto \color{blue}{4 \cdot \frac{x - z}{y} + 2} \]

      2. *-commutative N/A

         \[\leadsto \color{blue}{\frac{x - z}{y} \cdot 4} + 2 \]

      3. lower-fma.f64 N/A

         \[\leadsto \color{blue}{\mathsf{fma}\left(\frac{x - z}{y}, 4, 2\right)} \]

      4. lower-/.f64 N/A

         \[\leadsto \mathsf{fma}\left(\color{blue}{\frac{x - z}{y}}, 4, 2\right) \]

      5. lower--.f64 100.0

         \[\leadsto \mathsf{fma}\left(\frac{\color{blue}{x - z}}{y}, 4, 2\right) \]

   5. Applied rewrites 100.0%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\frac{x - z}{y}, 4, 2\right)} \]

   6. Taylor expanded in z around 0

      \[\leadsto \mathsf{fma}\left(\frac{x}{y}, 4, 2\right) \]
   7. Step-by-step derivation

   8. Applied rewrites 85.4%

      \[\leadsto \mathsf{fma}\left(\frac{x}{y}, 4, 2\right) \]

   if -2.3999999999999999e30 < x < 1.1e52

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-+.f64 N/A

         \[\leadsto \color{blue}{1 + \frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y}} \]

      2. +-commutative N/A

         \[\leadsto \color{blue}{\frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y} + 1} \]

      3. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y}} + 1 \]

      4. clear-num N/A

         \[\leadsto \color{blue}{\frac{1}{\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}}} + 1 \]

      5. inv-pow N/A

         \[\leadsto \color{blue}{{\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{-1}} + 1 \]

      6. sqr-pow N/A

         \[\leadsto \color{blue}{{\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)} \cdot {\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}} + 1 \]

      7. lower-fma.f64 N/A

         \[\leadsto \color{blue}{\mathsf{fma}\left({\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}, {\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}, 1\right)} \]

   4. Applied rewrites 69.1%

      \[\leadsto \color{blue}{\mathsf{fma}\left({\left(\frac{y}{\left(\mathsf{fma}\left(0.25, y, x\right) - z\right) \cdot 4}\right)}^{-0.5}, {\left(\frac{y}{\left(\mathsf{fma}\left(0.25, y, x\right) - z\right) \cdot 4}\right)}^{-0.5}, 1\right)} \]

   5. Taylor expanded in x around 0

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

      1. div-sub N/A

         \[\leadsto 1 + 4 \cdot \color{blue}{\left(\frac{\frac{1}{4} \cdot y}{y} - \frac{z}{y}\right)} \]

      2. associate-/l* N/A

         \[\leadsto 1 + 4 \cdot \left(\color{blue}{\frac{1}{4} \cdot \frac{y}{y}} - \frac{z}{y}\right) \]

      3. *-inverses N/A

         \[\leadsto 1 + 4 \cdot \left(\frac{1}{4} \cdot \color{blue}{1} - \frac{z}{y}\right) \]

      4. metadata-eval N/A

         \[\leadsto 1 + 4 \cdot \left(\color{blue}{\frac{1}{4}} - \frac{z}{y}\right) \]

      5. sub-neg N/A

         \[\leadsto 1 + 4 \cdot \color{blue}{\left(\frac{1}{4} + \left(\mathsf{neg}\left(\frac{z}{y}\right)\right)\right)} \]

      6. distribute-lft-in N/A

         \[\leadsto 1 + \color{blue}{\left(4 \cdot \frac{1}{4} + 4 \cdot \left(\mathsf{neg}\left(\frac{z}{y}\right)\right)\right)} \]

      7. metadata-eval N/A

         \[\leadsto 1 + \left(\color{blue}{1} + 4 \cdot \left(\mathsf{neg}\left(\frac{z}{y}\right)\right)\right) \]

      8. distribute-rgt-neg-in N/A

         \[\leadsto 1 + \left(1 + \color{blue}{\left(\mathsf{neg}\left(4 \cdot \frac{z}{y}\right)\right)}\right) \]

      9. distribute-lft-neg-in N/A

         \[\leadsto 1 + \left(1 + \color{blue}{\left(\mathsf{neg}\left(4\right)\right) \cdot \frac{z}{y}}\right) \]

      10. metadata-eval N/A

          \[\leadsto 1 + \left(1 + \color{blue}{-4} \cdot \frac{z}{y}\right) \]

      11. associate-+r+ N/A

          \[\leadsto \color{blue}{\left(1 + 1\right) + -4 \cdot \frac{z}{y}} \]

      12. metadata-eval N/A

          \[\leadsto \color{blue}{2} + -4 \cdot \frac{z}{y} \]

      13. +-commutative N/A

          \[\leadsto \color{blue}{-4 \cdot \frac{z}{y} + 2} \]

      14. *-commutative N/A

          \[\leadsto \color{blue}{\frac{z}{y} \cdot -4} + 2 \]

      15. lower-fma.f64 N/A

          \[\leadsto \color{blue}{\mathsf{fma}\left(\frac{z}{y}, -4, 2\right)} \]

      16. lower-/.f64 92.5

          \[\leadsto \mathsf{fma}\left(\color{blue}{\frac{z}{y}}, -4, 2\right) \]

   7. Applied rewrites 92.5%

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

Alternative 8: 80.6% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{z}{y} \cdot -4\\ \mathbf{if}\;z \leq -3.4 \cdot 10^{+154}:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;z \leq 4.5 \cdot 10^{+105}:\\ \;\;\;\;\mathsf{fma}\left(\frac{x}{y}, 4, 2\right)\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (let* ((t_0 (* (/ z y) -4.0)))
   (if (<= z -3.4e+154) t_0 (if (<= z 4.5e+105) (fma (/ x y) 4.0 2.0) t_0))))

C

double code(double x, double y, double z) {
	double t_0 = (z / y) * -4.0;
	double tmp;
	if (z <= -3.4e+154) {
		tmp = t_0;
	} else if (z <= 4.5e+105) {
		tmp = fma((x / y), 4.0, 2.0);
	} else {
		tmp = t_0;
	}
	return tmp;
}

Julia

function code(x, y, z)
	t_0 = Float64(Float64(z / y) * -4.0)
	tmp = 0.0
	if (z <= -3.4e+154)
		tmp = t_0;
	elseif (z <= 4.5e+105)
		tmp = fma(Float64(x / y), 4.0, 2.0);
	else
		tmp = t_0;
	end
	return tmp
end

Wolfram

code[x_, y_, z_] := Block[{t$95$0 = N[(N[(z / y), $MachinePrecision] * -4.0), $MachinePrecision]}, If[LessEqual[z, -3.4e+154], t$95$0, If[LessEqual[z, 4.5e+105], N[(N[(x / y), $MachinePrecision] * 4.0 + 2.0), $MachinePrecision], t$95$0]]]

Derivation

1. Split input into 2 regimes

2. if z < -3.39999999999999974e154 or 4.5000000000000001e105 < z

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift-+.f64 N/A

         \[\leadsto \color{blue}{1 + \frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y}} \]

      2. +-commutative N/A

         \[\leadsto \color{blue}{\frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y} + 1} \]

      3. lift-/.f64 N/A

         \[\leadsto \color{blue}{\frac{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}{y}} + 1 \]

      4. clear-num N/A

         \[\leadsto \color{blue}{\frac{1}{\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}}} + 1 \]

      5. inv-pow N/A

         \[\leadsto \color{blue}{{\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{-1}} + 1 \]

      6. sqr-pow N/A

         \[\leadsto \color{blue}{{\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)} \cdot {\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}} + 1 \]

      7. lower-fma.f64 N/A

         \[\leadsto \color{blue}{\mathsf{fma}\left({\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}, {\left(\frac{y}{4 \cdot \left(\left(x + y \cdot \frac{1}{4}\right) - z\right)}\right)}^{\left(\frac{-1}{2}\right)}, 1\right)} \]

   4. Applied rewrites 47.8%

      \[\leadsto \color{blue}{\mathsf{fma}\left({\left(\frac{y}{\left(\mathsf{fma}\left(0.25, y, x\right) - z\right) \cdot 4}\right)}^{-0.5}, {\left(\frac{y}{\left(\mathsf{fma}\left(0.25, y, x\right) - z\right) \cdot 4}\right)}^{-0.5}, 1\right)} \]

   5. Taylor expanded in z around inf

      \[\leadsto \color{blue}{-4 \cdot \frac{z}{y}} \]
   6. Step-by-step derivation

      1. *-commutative N/A

         \[\leadsto \color{blue}{\frac{z}{y} \cdot -4} \]

      2. lower-*.f64 N/A

         \[\leadsto \color{blue}{\frac{z}{y} \cdot -4} \]

      3. lower-/.f64 82.6

         \[\leadsto \color{blue}{\frac{z}{y}} \cdot -4 \]

   7. Applied rewrites 82.6%

      \[\leadsto \color{blue}{\frac{z}{y} \cdot -4} \]

   if -3.39999999999999974e154 < z < 4.5000000000000001e105

   1. Initial program 100.0%

      \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
   2. Add Preprocessing

   3. Taylor expanded in y around inf

      \[\leadsto \color{blue}{2 + 4 \cdot \frac{x - z}{y}} \]
   4. Step-by-step derivation

      1. +-commutative N/A

         \[\leadsto \color{blue}{4 \cdot \frac{x - z}{y} + 2} \]

      2. *-commutative N/A

         \[\leadsto \color{blue}{\frac{x - z}{y} \cdot 4} + 2 \]

      3. lower-fma.f64 N/A

         \[\leadsto \color{blue}{\mathsf{fma}\left(\frac{x - z}{y}, 4, 2\right)} \]

      4. lower-/.f64 N/A

         \[\leadsto \mathsf{fma}\left(\color{blue}{\frac{x - z}{y}}, 4, 2\right) \]

      5. lower--.f64 100.0

         \[\leadsto \mathsf{fma}\left(\frac{\color{blue}{x - z}}{y}, 4, 2\right) \]

   5. Applied rewrites 100.0%

      \[\leadsto \color{blue}{\mathsf{fma}\left(\frac{x - z}{y}, 4, 2\right)} \]

   6. Taylor expanded in z around 0

      \[\leadsto \mathsf{fma}\left(\frac{x}{y}, 4, 2\right) \]
   7. Step-by-step derivation

   8. Applied rewrites 83.9%

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

Alternative 9: 34.7% accurate, 31.0× speedup

Math

\[\begin{array}{l} \\ 2 \end{array} \]

FPCore

(FPCore (x y z) :precision binary64 2.0)

C

double code(double x, double y, double z) {
	return 2.0;
}

Fortran

real(8) function code(x, y, z)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    code = 2.0d0
end function

Java

public static double code(double x, double y, double z) {
	return 2.0;
}

Python

def code(x, y, z):
	return 2.0

Julia

function code(x, y, z)
	return 2.0
end

MATLAB

function tmp = code(x, y, z)
	tmp = 2.0;
end

Wolfram

code[x_, y_, z_] := 2.0

Derivation

1. Initial program 100.0%

   \[1 + \frac{4 \cdot \left(\left(x + y \cdot 0.25\right) - z\right)}{y} \]
2. Add Preprocessing

3. Taylor expanded in y around inf

   \[\leadsto \color{blue}{2} \]
4. Step-by-step derivation

5. Applied rewrites 33.4%

   \[\leadsto \color{blue}{2} \]
6. Add Preprocessing

Reproduce

herbie shell --seed 2024254 
(FPCore (x y z)
  :name "Data.Array.Repa.Algorithms.ColorRamp:rampColorHotToCold from repa-algorithms-3.4.0.1, C"
  :precision binary64
  (+ 1.0 (/ (* 4.0 (- (+ x (* y 0.25)) z)) y)))