Data.Colour.RGBSpace.HSL:hsl from colour-2.3.3, C

Percentage Accurate: 100.0% → 100.0%

Time: 3.7s

Alternatives: 4

Speedup: 1.0×

Specification

Math

\[\begin{array}{l} \\ x \cdot 2 - y \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (- (* x 2.0) y))

C

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

Fortran

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

Java

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

Python

def code(x, y):
	return (x * 2.0) - y

Julia

function code(x, y)
	return Float64(Float64(x * 2.0) - y)
end

MATLAB

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

Wolfram

code[x_, y_] := N[(N[(x * 2.0), $MachinePrecision] - y), $MachinePrecision]

Initial Program: 100.0% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ x \cdot 2 - y \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (- (* x 2.0) y))

C

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

Fortran

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

Java

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

Python

def code(x, y):
	return (x * 2.0) - y

Julia

function code(x, y)
	return Float64(Float64(x * 2.0) - y)
end

MATLAB

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

Wolfram

code[x_, y_] := N[(N[(x * 2.0), $MachinePrecision] - y), $MachinePrecision]

Alternative 1: 100.0% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ 2 \cdot x - y \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (- (* 2.0 x) y))

C

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

Fortran

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

Java

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

Python

def code(x, y):
	return (2.0 * x) - y

Julia

function code(x, y)
	return Float64(Float64(2.0 * x) - y)
end

MATLAB

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

Wolfram

code[x_, y_] := N[(N[(2.0 * x), $MachinePrecision] - y), $MachinePrecision]

Derivation

1. Initial program 100.0%

   \[x \cdot 2 - y \]
2. Add Preprocessing

3. Final simplification 100.0%

   \[\leadsto 2 \cdot x - y \]
4. Add Preprocessing

Alternative 2: 74.3% accurate, 0.5× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;y \leq -2.9 \cdot 10^{-19}:\\ \;\;\;\;-y\\ \mathbf{elif}\;y \leq 4.5 \cdot 10^{+41}:\\ \;\;\;\;2 \cdot x\\ \mathbf{else}:\\ \;\;\;\;-y\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= y -2.9e-19) (- y) (if (<= y 4.5e+41) (* 2.0 x) (- y))))

C

double code(double x, double y) {
	double tmp;
	if (y <= -2.9e-19) {
		tmp = -y;
	} else if (y <= 4.5e+41) {
		tmp = 2.0 * x;
	} else {
		tmp = -y;
	}
	return tmp;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: tmp
    if (y <= (-2.9d-19)) then
        tmp = -y
    else if (y <= 4.5d+41) then
        tmp = 2.0d0 * x
    else
        tmp = -y
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double tmp;
	if (y <= -2.9e-19) {
		tmp = -y;
	} else if (y <= 4.5e+41) {
		tmp = 2.0 * x;
	} else {
		tmp = -y;
	}
	return tmp;
}

Python

def code(x, y):
	tmp = 0
	if y <= -2.9e-19:
		tmp = -y
	elif y <= 4.5e+41:
		tmp = 2.0 * x
	else:
		tmp = -y
	return tmp

Julia

function code(x, y)
	tmp = 0.0
	if (y <= -2.9e-19)
		tmp = Float64(-y);
	elseif (y <= 4.5e+41)
		tmp = Float64(2.0 * x);
	else
		tmp = Float64(-y);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	tmp = 0.0;
	if (y <= -2.9e-19)
		tmp = -y;
	elseif (y <= 4.5e+41)
		tmp = 2.0 * x;
	else
		tmp = -y;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := If[LessEqual[y, -2.9e-19], (-y), If[LessEqual[y, 4.5e+41], N[(2.0 * x), $MachinePrecision], (-y)]]

Derivation

1. Split input into 2 regimes

2. if y < -2.9e-19 or 4.5000000000000001e41 < y

   1. Initial program 100.0%

      \[x \cdot 2 - y \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

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

      1. mul-1-neg N/A

         \[\leadsto \color{blue}{\mathsf{neg}\left(y\right)} \]

      2. lower-neg.f64 74.8

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

   5. Applied rewrites 74.8%

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

   if -2.9e-19 < y < 4.5000000000000001e41

   1. Initial program 100.0%

      \[x \cdot 2 - y \]
   2. Add Preprocessing

   3. Taylor expanded in x around inf

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

      1. metadata-eval N/A

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

      2. *-inverses N/A

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

      3. associate-/l* N/A

         \[\leadsto \color{blue}{\frac{2 \cdot y}{y}} \cdot x \]

      4. associate-*l/ N/A

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

      5. lower-*.f64 N/A

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

      6. associate-*l/ N/A

         \[\leadsto \color{blue}{\frac{2 \cdot y}{y}} \cdot x \]

      7. associate-/l* N/A

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

      8. *-inverses N/A

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

      9. metadata-eval 73.8

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

   5. Applied rewrites 73.8%

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

Reproduce

herbie shell --seed 2024230 
(FPCore (x y)
  :name "Data.Colour.RGBSpace.HSL:hsl from colour-2.3.3, C"
  :precision binary64
  (- (* x 2.0) y))