Diagrams.Solve.Polynomial:quartForm from diagrams-solve-0.1, D

Percentage Accurate: 100.0% → 100.0%

Time: 4.2s

Alternatives: 4

Speedup: 1.0×

Specification

Math

\[\begin{array}{l} \\ \frac{x \cdot y}{2} - \frac{z}{8} \end{array} \]

FPCore

(FPCore (x y z) :precision binary64 (- (/ (* x y) 2.0) (/ z 8.0)))

C

double code(double x, double y, double z) {
	return ((x * y) / 2.0) - (z / 8.0);
}

Fortran

real(8) function code(x, y, z)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    code = ((x * y) / 2.0d0) - (z / 8.0d0)
end function

Java

public static double code(double x, double y, double z) {
	return ((x * y) / 2.0) - (z / 8.0);
}

Python

def code(x, y, z):
	return ((x * y) / 2.0) - (z / 8.0)

Julia

function code(x, y, z)
	return Float64(Float64(Float64(x * y) / 2.0) - Float64(z / 8.0))
end

MATLAB

function tmp = code(x, y, z)
	tmp = ((x * y) / 2.0) - (z / 8.0);
end

Wolfram

code[x_, y_, z_] := N[(N[(N[(x * y), $MachinePrecision] / 2.0), $MachinePrecision] - N[(z / 8.0), $MachinePrecision]), $MachinePrecision]

Initial Program: 100.0% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \frac{x \cdot y}{2} - \frac{z}{8} \end{array} \]

FPCore

(FPCore (x y z) :precision binary64 (- (/ (* x y) 2.0) (/ z 8.0)))

C

double code(double x, double y, double z) {
	return ((x * y) / 2.0) - (z / 8.0);
}

Fortran

real(8) function code(x, y, z)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    code = ((x * y) / 2.0d0) - (z / 8.0d0)
end function

Java

public static double code(double x, double y, double z) {
	return ((x * y) / 2.0) - (z / 8.0);
}

Python

def code(x, y, z):
	return ((x * y) / 2.0) - (z / 8.0)

Julia

function code(x, y, z)
	return Float64(Float64(Float64(x * y) / 2.0) - Float64(z / 8.0))
end

MATLAB

function tmp = code(x, y, z)
	tmp = ((x * y) / 2.0) - (z / 8.0);
end

Wolfram

code[x_, y_, z_] := N[(N[(N[(x * y), $MachinePrecision] / 2.0), $MachinePrecision] - N[(z / 8.0), $MachinePrecision]), $MachinePrecision]

Alternative 1: 100.0% accurate, 0.1× speedup

Math

\[\begin{array}{l} \\ \mathsf{fma}\left(x, \frac{y}{2}, z \cdot -0.125\right) \end{array} \]

FPCore

(FPCore (x y z) :precision binary64 (fma x (/ y 2.0) (* z -0.125)))

C

double code(double x, double y, double z) {
	return fma(x, (y / 2.0), (z * -0.125));
}

Julia

function code(x, y, z)
	return fma(x, Float64(y / 2.0), Float64(z * -0.125))
end

Wolfram

code[x_, y_, z_] := N[(x * N[(y / 2.0), $MachinePrecision] + N[(z * -0.125), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.7%

   \[\frac{x \cdot y}{2} - \frac{z}{8} \]
2. Step-by-step derivation

   1. associate-*r/ 100.0%

      \[\leadsto \color{blue}{x \cdot \frac{y}{2}} - \frac{z}{8} \]

   2. *-commutative 100.0%

      \[\leadsto \color{blue}{\frac{y}{2} \cdot x} - \frac{z}{8} \]

   3. *-commutative 100.0%

      \[\leadsto \color{blue}{x \cdot \frac{y}{2}} - \frac{z}{8} \]

   4. fma-neg 100.0%

      \[\leadsto \color{blue}{\mathsf{fma}\left(x, \frac{y}{2}, -\frac{z}{8}\right)} \]

   5. distribute-neg-frac 100.0%

      \[\leadsto \mathsf{fma}\left(x, \frac{y}{2}, \color{blue}{\frac{-z}{8}}\right) \]

   6. neg-mul-1 100.0%

      \[\leadsto \mathsf{fma}\left(x, \frac{y}{2}, \frac{\color{blue}{-1 \cdot z}}{8}\right) \]

   7. associate-/l* 99.8%

      \[\leadsto \mathsf{fma}\left(x, \frac{y}{2}, \color{blue}{\frac{-1}{\frac{8}{z}}}\right) \]

   8. associate-/r/ 100.0%

      \[\leadsto \mathsf{fma}\left(x, \frac{y}{2}, \color{blue}{\frac{-1}{8} \cdot z}\right) \]

   9. *-commutative 100.0%

      \[\leadsto \mathsf{fma}\left(x, \frac{y}{2}, \color{blue}{z \cdot \frac{-1}{8}}\right) \]

   10. metadata-eval 100.0%

       \[\leadsto \mathsf{fma}\left(x, \frac{y}{2}, z \cdot \color{blue}{-0.125}\right) \]

3. Simplified 100.0%

   \[\leadsto \color{blue}{\mathsf{fma}\left(x, \frac{y}{2}, z \cdot -0.125\right)} \]

4. Final simplification 100.0%

   \[\leadsto \mathsf{fma}\left(x, \frac{y}{2}, z \cdot -0.125\right) \]

Alternative 2: 68.7% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;x \leq -2.9 \cdot 10^{-38} \lor \neg \left(x \leq 1.76 \cdot 10^{-127}\right):\\ \;\;\;\;y \cdot \left(x \cdot 0.5\right)\\ \mathbf{else}:\\ \;\;\;\;z \cdot -0.125\\ \end{array} \end{array} \]

FPCore

(FPCore (x y z)
 :precision binary64
 (if (or (<= x -2.9e-38) (not (<= x 1.76e-127))) (* y (* x 0.5)) (* z -0.125)))

C

double code(double x, double y, double z) {
	double tmp;
	if ((x <= -2.9e-38) || !(x <= 1.76e-127)) {
		tmp = y * (x * 0.5);
	} else {
		tmp = z * -0.125;
	}
	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) :: tmp
    if ((x <= (-2.9d-38)) .or. (.not. (x <= 1.76d-127))) then
        tmp = y * (x * 0.5d0)
    else
        tmp = z * (-0.125d0)
    end if
    code = tmp
end function

Java

public static double code(double x, double y, double z) {
	double tmp;
	if ((x <= -2.9e-38) || !(x <= 1.76e-127)) {
		tmp = y * (x * 0.5);
	} else {
		tmp = z * -0.125;
	}
	return tmp;
}

Python

def code(x, y, z):
	tmp = 0
	if (x <= -2.9e-38) or not (x <= 1.76e-127):
		tmp = y * (x * 0.5)
	else:
		tmp = z * -0.125
	return tmp

Julia

function code(x, y, z)
	tmp = 0.0
	if ((x <= -2.9e-38) || !(x <= 1.76e-127))
		tmp = Float64(y * Float64(x * 0.5));
	else
		tmp = Float64(z * -0.125);
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y, z)
	tmp = 0.0;
	if ((x <= -2.9e-38) || ~((x <= 1.76e-127)))
		tmp = y * (x * 0.5);
	else
		tmp = z * -0.125;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_, z_] := If[Or[LessEqual[x, -2.9e-38], N[Not[LessEqual[x, 1.76e-127]], $MachinePrecision]], N[(y * N[(x * 0.5), $MachinePrecision]), $MachinePrecision], N[(z * -0.125), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if x < -2.89999999999999994e-38 or 1.76000000000000007e-127 < x

   1. Initial program 99.5%

      \[\frac{x \cdot y}{2} - \frac{z}{8} \]
   2. Step-by-step derivation

      1. associate-*l/ 100.0%

         \[\leadsto \color{blue}{\frac{x}{2} \cdot y} - \frac{z}{8} \]

   3. Simplified 100.0%

      \[\leadsto \color{blue}{\frac{x}{2} \cdot y - \frac{z}{8}} \]

   4. Taylor expanded in x around inf 67.9%

      \[\leadsto \color{blue}{0.5 \cdot \left(y \cdot x\right)} \]
   5. Step-by-step derivation

      1. associate-*r* 68.3%

         \[\leadsto \color{blue}{\left(0.5 \cdot y\right) \cdot x} \]

      2. *-commutative 68.3%

         \[\leadsto \color{blue}{\left(y \cdot 0.5\right)} \cdot x \]

      3. associate-*l* 68.3%

         \[\leadsto \color{blue}{y \cdot \left(0.5 \cdot x\right)} \]

   6. Simplified 68.3%

      \[\leadsto \color{blue}{y \cdot \left(0.5 \cdot x\right)} \]

   if -2.89999999999999994e-38 < x < 1.76000000000000007e-127

   1. Initial program 100.0%

      \[\frac{x \cdot y}{2} - \frac{z}{8} \]
   2. Step-by-step derivation

      1. associate-*l/ 100.0%

         \[\leadsto \color{blue}{\frac{x}{2} \cdot y} - \frac{z}{8} \]

   3. Simplified 100.0%

      \[\leadsto \color{blue}{\frac{x}{2} \cdot y - \frac{z}{8}} \]

   4. Taylor expanded in x around 0 78.6%

      \[\leadsto \color{blue}{-0.125 \cdot z} \]
3. Recombined 2 regimes into one program.

4. Final simplification 71.9%

   \[\leadsto \begin{array}{l} \mathbf{if}\;x \leq -2.9 \cdot 10^{-38} \lor \neg \left(x \leq 1.76 \cdot 10^{-127}\right):\\ \;\;\;\;y \cdot \left(x \cdot 0.5\right)\\ \mathbf{else}:\\ \;\;\;\;z \cdot -0.125\\ \end{array} \]

Alternative 3: 100.0% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ y \cdot \frac{x}{2} - \frac{z}{8} \end{array} \]

FPCore

(FPCore (x y z) :precision binary64 (- (* y (/ x 2.0)) (/ z 8.0)))

C

double code(double x, double y, double z) {
	return (y * (x / 2.0)) - (z / 8.0);
}

Fortran

real(8) function code(x, y, z)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    code = (y * (x / 2.0d0)) - (z / 8.0d0)
end function

Java

public static double code(double x, double y, double z) {
	return (y * (x / 2.0)) - (z / 8.0);
}

Python

def code(x, y, z):
	return (y * (x / 2.0)) - (z / 8.0)

Julia

function code(x, y, z)
	return Float64(Float64(y * Float64(x / 2.0)) - Float64(z / 8.0))
end

MATLAB

function tmp = code(x, y, z)
	tmp = (y * (x / 2.0)) - (z / 8.0);
end

Wolfram

code[x_, y_, z_] := N[(N[(y * N[(x / 2.0), $MachinePrecision]), $MachinePrecision] - N[(z / 8.0), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.7%

   \[\frac{x \cdot y}{2} - \frac{z}{8} \]
2. Step-by-step derivation

   1. associate-*l/ 100.0%

      \[\leadsto \color{blue}{\frac{x}{2} \cdot y} - \frac{z}{8} \]

3. Simplified 100.0%

   \[\leadsto \color{blue}{\frac{x}{2} \cdot y - \frac{z}{8}} \]

4. Final simplification 100.0%

   \[\leadsto y \cdot \frac{x}{2} - \frac{z}{8} \]

Alternative 4: 50.3% accurate, 3.0× speedup

Math

\[\begin{array}{l} \\ z \cdot -0.125 \end{array} \]

FPCore

(FPCore (x y z) :precision binary64 (* z -0.125))

C

double code(double x, double y, double z) {
	return z * -0.125;
}

Fortran

real(8) function code(x, y, z)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    code = z * (-0.125d0)
end function

Java

public static double code(double x, double y, double z) {
	return z * -0.125;
}

Python

def code(x, y, z):
	return z * -0.125

Julia

function code(x, y, z)
	return Float64(z * -0.125)
end

MATLAB

function tmp = code(x, y, z)
	tmp = z * -0.125;
end

Wolfram

code[x_, y_, z_] := N[(z * -0.125), $MachinePrecision]

Derivation

1. Initial program 99.7%

   \[\frac{x \cdot y}{2} - \frac{z}{8} \]
2. Step-by-step derivation

   1. associate-*l/ 100.0%

      \[\leadsto \color{blue}{\frac{x}{2} \cdot y} - \frac{z}{8} \]

3. Simplified 100.0%

   \[\leadsto \color{blue}{\frac{x}{2} \cdot y - \frac{z}{8}} \]

4. Taylor expanded in x around 0 48.8%

   \[\leadsto \color{blue}{-0.125 \cdot z} \]

5. Final simplification 48.8%

   \[\leadsto z \cdot -0.125 \]

Reproduce

herbie shell --seed 2023255 
(FPCore (x y z)
  :name "Diagrams.Solve.Polynomial:quartForm  from diagrams-solve-0.1, D"
  :precision binary64
  (- (/ (* x y) 2.0) (/ z 8.0)))