Data.Colour.CIE:cieLABView from colour-2.3.3, B

Percentage Accurate: 100.0% → 100.0%

Time: 2.5s

Alternatives: 4

Speedup: 1.0×

Specification

Math

\[\begin{array}{l} \\ 500 \cdot \left(x - y\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* 500.0 (- x y)))

C

double code(double x, double y) {
	return 500.0 * (x - y);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = 500.0d0 * (x - y)
end function

Java

public static double code(double x, double y) {
	return 500.0 * (x - y);
}

Python

def code(x, y):
	return 500.0 * (x - y)

Julia

function code(x, y)
	return Float64(500.0 * Float64(x - y))
end

MATLAB

function tmp = code(x, y)
	tmp = 500.0 * (x - y);
end

Wolfram

code[x_, y_] := N[(500.0 * N[(x - y), $MachinePrecision]), $MachinePrecision]

Initial Program: 100.0% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ 500 \cdot \left(x - y\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* 500.0 (- x y)))

C

double code(double x, double y) {
	return 500.0 * (x - y);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = 500.0d0 * (x - y)
end function

Java

public static double code(double x, double y) {
	return 500.0 * (x - y);
}

Python

def code(x, y):
	return 500.0 * (x - y)

Julia

function code(x, y)
	return Float64(500.0 * Float64(x - y))
end

MATLAB

function tmp = code(x, y)
	tmp = 500.0 * (x - y);
end

Wolfram

code[x_, y_] := N[(500.0 * N[(x - y), $MachinePrecision]), $MachinePrecision]

Alternative 1: 100.0% accurate, 0.8× speedup

Math

\[\begin{array}{l} \\ \mathsf{fma}\left(x, 500, y \cdot -500\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (fma x 500.0 (* y -500.0)))

C

double code(double x, double y) {
	return fma(x, 500.0, (y * -500.0));
}

Julia

function code(x, y)
	return fma(x, 500.0, Float64(y * -500.0))
end

Wolfram

code[x_, y_] := N[(x * 500.0 + N[(y * -500.0), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 100.0%

   \[500 \cdot \left(x - y\right) \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift-*.f64 N/A

      \[\leadsto \color{blue}{500 \cdot \left(x - y\right)} \]

   2. lift--.f64 N/A

      \[\leadsto 500 \cdot \color{blue}{\left(x - y\right)} \]

   3. sub-neg N/A

      \[\leadsto 500 \cdot \color{blue}{\left(x + \left(\mathsf{neg}\left(y\right)\right)\right)} \]

   4. distribute-rgt-in N/A

      \[\leadsto \color{blue}{x \cdot 500 + \left(\mathsf{neg}\left(y\right)\right) \cdot 500} \]

   5. *-commutative N/A

      \[\leadsto x \cdot 500 + \color{blue}{500 \cdot \left(\mathsf{neg}\left(y\right)\right)} \]

   6. lower-fma.f64 N/A

      \[\leadsto \color{blue}{\mathsf{fma}\left(x, 500, 500 \cdot \left(\mathsf{neg}\left(y\right)\right)\right)} \]

   7. neg-mul-1 N/A

      \[\leadsto \mathsf{fma}\left(x, 500, 500 \cdot \color{blue}{\left(-1 \cdot y\right)}\right) \]

   8. associate-*r* N/A

      \[\leadsto \mathsf{fma}\left(x, 500, \color{blue}{\left(500 \cdot -1\right) \cdot y}\right) \]

   9. lower-*.f64 N/A

      \[\leadsto \mathsf{fma}\left(x, 500, \color{blue}{\left(500 \cdot -1\right) \cdot y}\right) \]

   10. metadata-eval 100.0

       \[\leadsto \mathsf{fma}\left(x, 500, \color{blue}{-500} \cdot y\right) \]

4. Applied rewrites 100.0%

   \[\leadsto \color{blue}{\mathsf{fma}\left(x, 500, -500 \cdot y\right)} \]

5. Final simplification 100.0%

   \[\leadsto \mathsf{fma}\left(x, 500, y \cdot -500\right) \]
6. Add Preprocessing

Alternative 2: 73.9% accurate, 0.5× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;y \leq -3.85 \cdot 10^{-22}:\\ \;\;\;\;y \cdot -500\\ \mathbf{elif}\;y \leq 4.2 \cdot 10^{-42}:\\ \;\;\;\;500 \cdot x\\ \mathbf{else}:\\ \;\;\;\;y \cdot -500\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= y -3.85e-22)
   (* y -500.0)
   (if (<= y 4.2e-42) (* 500.0 x) (* y -500.0))))

C

double code(double x, double y) {
	double tmp;
	if (y <= -3.85e-22) {
		tmp = y * -500.0;
	} else if (y <= 4.2e-42) {
		tmp = 500.0 * x;
	} else {
		tmp = y * -500.0;
	}
	return tmp;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: tmp
    if (y <= (-3.85d-22)) then
        tmp = y * (-500.0d0)
    else if (y <= 4.2d-42) then
        tmp = 500.0d0 * x
    else
        tmp = y * (-500.0d0)
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double tmp;
	if (y <= -3.85e-22) {
		tmp = y * -500.0;
	} else if (y <= 4.2e-42) {
		tmp = 500.0 * x;
	} else {
		tmp = y * -500.0;
	}
	return tmp;
}

Python

def code(x, y):
	tmp = 0
	if y <= -3.85e-22:
		tmp = y * -500.0
	elif y <= 4.2e-42:
		tmp = 500.0 * x
	else:
		tmp = y * -500.0
	return tmp

Julia

function code(x, y)
	tmp = 0.0
	if (y <= -3.85e-22)
		tmp = Float64(y * -500.0);
	elseif (y <= 4.2e-42)
		tmp = Float64(500.0 * x);
	else
		tmp = Float64(y * -500.0);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	tmp = 0.0;
	if (y <= -3.85e-22)
		tmp = y * -500.0;
	elseif (y <= 4.2e-42)
		tmp = 500.0 * x;
	else
		tmp = y * -500.0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := If[LessEqual[y, -3.85e-22], N[(y * -500.0), $MachinePrecision], If[LessEqual[y, 4.2e-42], N[(500.0 * x), $MachinePrecision], N[(y * -500.0), $MachinePrecision]]]

Derivation

1. Split input into 2 regimes

2. if y < -3.8500000000000001e-22 or 4.20000000000000013e-42 < y

   1. Initial program 100.0%

      \[500 \cdot \left(x - y\right) \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

      \[\leadsto \color{blue}{-500 \cdot y} \]
   4. Step-by-step derivation

      1. lower-*.f64 79.2

         \[\leadsto \color{blue}{-500 \cdot y} \]

   5. Applied rewrites 79.2%

      \[\leadsto \color{blue}{-500 \cdot y} \]

   if -3.8500000000000001e-22 < y < 4.20000000000000013e-42

   1. Initial program 100.0%

      \[500 \cdot \left(x - y\right) \]
   2. Add Preprocessing

   3. Taylor expanded in x around inf

      \[\leadsto \color{blue}{500 \cdot x} \]
   4. Step-by-step derivation

      1. lower-*.f64 82.4

         \[\leadsto \color{blue}{500 \cdot x} \]

   5. Applied rewrites 82.4%

      \[\leadsto \color{blue}{500 \cdot x} \]
3. Recombined 2 regimes into one program.

4. Final simplification 80.7%

   \[\leadsto \begin{array}{l} \mathbf{if}\;y \leq -3.85 \cdot 10^{-22}:\\ \;\;\;\;y \cdot -500\\ \mathbf{elif}\;y \leq 4.2 \cdot 10^{-42}:\\ \;\;\;\;500 \cdot x\\ \mathbf{else}:\\ \;\;\;\;y \cdot -500\\ \end{array} \]
5. Add Preprocessing

Alternative 3: 100.0% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \left(x - y\right) \cdot 500 \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* (- x y) 500.0))

C

double code(double x, double y) {
	return (x - y) * 500.0;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = (x - y) * 500.0d0
end function

Java

public static double code(double x, double y) {
	return (x - y) * 500.0;
}

Python

def code(x, y):
	return (x - y) * 500.0

Julia

function code(x, y)
	return Float64(Float64(x - y) * 500.0)
end

MATLAB

function tmp = code(x, y)
	tmp = (x - y) * 500.0;
end

Wolfram

code[x_, y_] := N[(N[(x - y), $MachinePrecision] * 500.0), $MachinePrecision]

Derivation

1. Initial program 100.0%

   \[500 \cdot \left(x - y\right) \]
2. Add Preprocessing

3. Final simplification 100.0%

   \[\leadsto \left(x - y\right) \cdot 500 \]
4. Add Preprocessing

Alternative 4: 50.2% accurate, 1.5× speedup

Math

\[\begin{array}{l} \\ y \cdot -500 \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* y -500.0))

C

double code(double x, double y) {
	return y * -500.0;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = y * (-500.0d0)
end function

Java

public static double code(double x, double y) {
	return y * -500.0;
}

Python

def code(x, y):
	return y * -500.0

Julia

function code(x, y)
	return Float64(y * -500.0)
end

MATLAB

function tmp = code(x, y)
	tmp = y * -500.0;
end

Wolfram

code[x_, y_] := N[(y * -500.0), $MachinePrecision]

Derivation

1. Initial program 100.0%

   \[500 \cdot \left(x - y\right) \]
2. Add Preprocessing

3. Taylor expanded in x around 0

   \[\leadsto \color{blue}{-500 \cdot y} \]
4. Step-by-step derivation

   1. lower-*.f64 51.2

      \[\leadsto \color{blue}{-500 \cdot y} \]

5. Applied rewrites 51.2%

   \[\leadsto \color{blue}{-500 \cdot y} \]

6. Final simplification 51.2%

   \[\leadsto y \cdot -500 \]
7. Add Preprocessing

Reproduce

herbie shell --seed 2024283 
(FPCore (x y)
  :name "Data.Colour.CIE:cieLABView from colour-2.3.3, B"
  :precision binary64
  (* 500.0 (- x y)))