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

Percentage Accurate: 100.0% → 100.0%

Time: 5.3s

Alternatives: 4

Speedup: 1.0×

Specification

Math

\[\begin{array}{l} \\ 200 \cdot \left(x - y\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* 200.0 (- x y)))

C

double code(double x, double y) {
	return 200.0 * (x - y);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = 200.0d0 * (x - y)
end function

Java

public static double code(double x, double y) {
	return 200.0 * (x - y);
}

Python

def code(x, y):
	return 200.0 * (x - y)

Julia

function code(x, y)
	return Float64(200.0 * Float64(x - y))
end

MATLAB

function tmp = code(x, y)
	tmp = 200.0 * (x - y);
end

Wolfram

code[x_, y_] := N[(200.0 * N[(x - y), $MachinePrecision]), $MachinePrecision]

Initial Program: 100.0% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ 200 \cdot \left(x - y\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* 200.0 (- x y)))

C

double code(double x, double y) {
	return 200.0 * (x - y);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = 200.0d0 * (x - y)
end function

Java

public static double code(double x, double y) {
	return 200.0 * (x - y);
}

Python

def code(x, y):
	return 200.0 * (x - y)

Julia

function code(x, y)
	return Float64(200.0 * Float64(x - y))
end

MATLAB

function tmp = code(x, y)
	tmp = 200.0 * (x - y);
end

Wolfram

code[x_, y_] := N[(200.0 * N[(x - y), $MachinePrecision]), $MachinePrecision]

Alternative 1: 100.0% accurate, 0.0× speedup

Math

\[\begin{array}{l} \\ \mathsf{fma}\left(x, 200, 200 \cdot \left(-y\right)\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (fma x 200.0 (* 200.0 (- y))))

C

double code(double x, double y) {
	return fma(x, 200.0, (200.0 * -y));
}

Julia

function code(x, y)
	return fma(x, 200.0, Float64(200.0 * Float64(-y)))
end

Wolfram

code[x_, y_] := N[(x * 200.0 + N[(200.0 * (-y)), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 100.0%

   \[200 \cdot \left(x - y\right) \]
2. Add Preprocessing
3. Step-by-step derivation

   1. sub-neg 100.0%

      \[\leadsto 200 \cdot \color{blue}{\left(x + \left(-y\right)\right)} \]

   2. distribute-rgt-in 100.0%

      \[\leadsto \color{blue}{x \cdot 200 + \left(-y\right) \cdot 200} \]

   3. fma-define 100.0%

      \[\leadsto \color{blue}{\mathsf{fma}\left(x, 200, \left(-y\right) \cdot 200\right)} \]

4. Applied egg-rr 100.0%

   \[\leadsto \color{blue}{\mathsf{fma}\left(x, 200, \left(-y\right) \cdot 200\right)} \]

5. Final simplification 100.0%

   \[\leadsto \mathsf{fma}\left(x, 200, 200 \cdot \left(-y\right)\right) \]
6. Add Preprocessing

Alternative 2: 73.7% accurate, 0.2× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq -3.8 \cdot 10^{+79} \lor \neg \left(x \leq -2.5 \cdot 10^{+28} \lor \neg \left(x \leq -1.15 \cdot 10^{-46}\right) \land x \leq 6 \cdot 10^{-35}\right):\\ \;\;\;\;x \cdot 200\\ \mathbf{else}:\\ \;\;\;\;y \cdot -200\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (or (<= x -3.8e+79)
         (not (or (<= x -2.5e+28) (and (not (<= x -1.15e-46)) (<= x 6e-35)))))
   (* x 200.0)
   (* y -200.0)))

C

double code(double x, double y) {
	double tmp;
	if ((x <= -3.8e+79) || !((x <= -2.5e+28) || (!(x <= -1.15e-46) && (x <= 6e-35)))) {
		tmp = x * 200.0;
	} else {
		tmp = y * -200.0;
	}
	return tmp;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: tmp
    if ((x <= (-3.8d+79)) .or. (.not. (x <= (-2.5d+28)) .or. (.not. (x <= (-1.15d-46))) .and. (x <= 6d-35))) then
        tmp = x * 200.0d0
    else
        tmp = y * (-200.0d0)
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double tmp;
	if ((x <= -3.8e+79) || !((x <= -2.5e+28) || (!(x <= -1.15e-46) && (x <= 6e-35)))) {
		tmp = x * 200.0;
	} else {
		tmp = y * -200.0;
	}
	return tmp;
}

Python

def code(x, y):
	tmp = 0
	if (x <= -3.8e+79) or not ((x <= -2.5e+28) or (not (x <= -1.15e-46) and (x <= 6e-35))):
		tmp = x * 200.0
	else:
		tmp = y * -200.0
	return tmp

Julia

function code(x, y)
	tmp = 0.0
	if ((x <= -3.8e+79) || !((x <= -2.5e+28) || (!(x <= -1.15e-46) && (x <= 6e-35))))
		tmp = Float64(x * 200.0);
	else
		tmp = Float64(y * -200.0);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	tmp = 0.0;
	if ((x <= -3.8e+79) || ~(((x <= -2.5e+28) || (~((x <= -1.15e-46)) && (x <= 6e-35)))))
		tmp = x * 200.0;
	else
		tmp = y * -200.0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := If[Or[LessEqual[x, -3.8e+79], N[Not[Or[LessEqual[x, -2.5e+28], And[N[Not[LessEqual[x, -1.15e-46]], $MachinePrecision], LessEqual[x, 6e-35]]]], $MachinePrecision]], N[(x * 200.0), $MachinePrecision], N[(y * -200.0), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if x < -3.8000000000000002e79 or -2.49999999999999979e28 < x < -1.15e-46 or 5.99999999999999978e-35 < x

   1. Initial program 100.0%

      \[200 \cdot \left(x - y\right) \]
   2. Add Preprocessing

   3. Taylor expanded in x around inf 80.1%

      \[\leadsto \color{blue}{200 \cdot x} \]

   if -3.8000000000000002e79 < x < -2.49999999999999979e28 or -1.15e-46 < x < 5.99999999999999978e-35

   1. Initial program 100.0%

      \[200 \cdot \left(x - y\right) \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0 78.5%

      \[\leadsto \color{blue}{-200 \cdot y} \]
3. Recombined 2 regimes into one program.

4. Final simplification 79.3%

   \[\leadsto \begin{array}{l} \mathbf{if}\;x \leq -3.8 \cdot 10^{+79} \lor \neg \left(x \leq -2.5 \cdot 10^{+28} \lor \neg \left(x \leq -1.15 \cdot 10^{-46}\right) \land x \leq 6 \cdot 10^{-35}\right):\\ \;\;\;\;x \cdot 200\\ \mathbf{else}:\\ \;\;\;\;y \cdot -200\\ \end{array} \]
5. Add Preprocessing

Alternative 3: 100.0% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ 200 \cdot \left(x - y\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* 200.0 (- x y)))

C

double code(double x, double y) {
	return 200.0 * (x - y);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = 200.0d0 * (x - y)
end function

Java

public static double code(double x, double y) {
	return 200.0 * (x - y);
}

Python

def code(x, y):
	return 200.0 * (x - y)

Julia

function code(x, y)
	return Float64(200.0 * Float64(x - y))
end

MATLAB

function tmp = code(x, y)
	tmp = 200.0 * (x - y);
end

Wolfram

code[x_, y_] := N[(200.0 * N[(x - y), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 100.0%

   \[200 \cdot \left(x - y\right) \]
2. Add Preprocessing
3. Add Preprocessing

Alternative 4: 50.1% accurate, 1.7× speedup

Math

\[\begin{array}{l} \\ y \cdot -200 \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* y -200.0))

C

double code(double x, double y) {
	return y * -200.0;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = y * (-200.0d0)
end function

Java

public static double code(double x, double y) {
	return y * -200.0;
}

Python

def code(x, y):
	return y * -200.0

Julia

function code(x, y)
	return Float64(y * -200.0)
end

MATLAB

function tmp = code(x, y)
	tmp = y * -200.0;
end

Wolfram

code[x_, y_] := N[(y * -200.0), $MachinePrecision]

Derivation

1. Initial program 100.0%

   \[200 \cdot \left(x - y\right) \]
2. Add Preprocessing

3. Taylor expanded in x around 0 48.5%

   \[\leadsto \color{blue}{-200 \cdot y} \]

4. Final simplification 48.5%

   \[\leadsto y \cdot -200 \]
5. Add Preprocessing

Reproduce

herbie shell --seed 2024110 
(FPCore (x y)
  :name "Data.Colour.CIE:cieLABView from colour-2.3.3, C"
  :precision binary64
  (* 200.0 (- x y)))