Statistics.Distribution.Binomial:$cvariance from math-functions-0.1.5.2

Percentage Accurate: 99.9% → 99.9%

Time: 9.7s

Alternatives: 7

Speedup: 1.0×

• 24.5% of points produce a very large (infinite) output. You may want to add a precondition.

Specification

Math

\[\begin{array}{l} \\ \left(x \cdot y\right) \cdot \left(1 - y\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* (* x y) (- 1.0 y)))

C

double code(double x, double y) {
	return (x * y) * (1.0 - y);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = (x * y) * (1.0d0 - y)
end function

Java

public static double code(double x, double y) {
	return (x * y) * (1.0 - y);
}

Python

def code(x, y):
	return (x * y) * (1.0 - y)

Julia

function code(x, y)
	return Float64(Float64(x * y) * Float64(1.0 - y))
end

MATLAB

function tmp = code(x, y)
	tmp = (x * y) * (1.0 - y);
end

Wolfram

code[x_, y_] := N[(N[(x * y), $MachinePrecision] * N[(1.0 - y), $MachinePrecision]), $MachinePrecision]

Initial Program: 99.9% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \left(x \cdot y\right) \cdot \left(1 - y\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* (* x y) (- 1.0 y)))

C

double code(double x, double y) {
	return (x * y) * (1.0 - y);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = (x * y) * (1.0d0 - y)
end function

Java

public static double code(double x, double y) {
	return (x * y) * (1.0 - y);
}

Python

def code(x, y):
	return (x * y) * (1.0 - y)

Julia

function code(x, y)
	return Float64(Float64(x * y) * Float64(1.0 - y))
end

MATLAB

function tmp = code(x, y)
	tmp = (x * y) * (1.0 - y);
end

Wolfram

code[x_, y_] := N[(N[(x * y), $MachinePrecision] * N[(1.0 - y), $MachinePrecision]), $MachinePrecision]

Alternative 1: 99.9% accurate, 0.5× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := -y \cdot \left(x \cdot y\right)\\ \mathbf{if}\;y \leq -9 \cdot 10^{+15}:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;y \leq 10^{+93}:\\ \;\;\;\;x \cdot \left(y - y \cdot y\right)\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (let* ((t_0 (- (* y (* x y)))))
   (if (<= y -9e+15) t_0 (if (<= y 1e+93) (* x (- y (* y y))) t_0))))

C

double code(double x, double y) {
	double t_0 = -(y * (x * y));
	double tmp;
	if (y <= -9e+15) {
		tmp = t_0;
	} else if (y <= 1e+93) {
		tmp = x * (y - (y * y));
	} else {
		tmp = t_0;
	}
	return tmp;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: t_0
    real(8) :: tmp
    t_0 = -(y * (x * y))
    if (y <= (-9d+15)) then
        tmp = t_0
    else if (y <= 1d+93) then
        tmp = x * (y - (y * y))
    else
        tmp = t_0
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double t_0 = -(y * (x * y));
	double tmp;
	if (y <= -9e+15) {
		tmp = t_0;
	} else if (y <= 1e+93) {
		tmp = x * (y - (y * y));
	} else {
		tmp = t_0;
	}
	return tmp;
}

Python

def code(x, y):
	t_0 = -(y * (x * y))
	tmp = 0
	if y <= -9e+15:
		tmp = t_0
	elif y <= 1e+93:
		tmp = x * (y - (y * y))
	else:
		tmp = t_0
	return tmp

Julia

function code(x, y)
	t_0 = Float64(-Float64(y * Float64(x * y)))
	tmp = 0.0
	if (y <= -9e+15)
		tmp = t_0;
	elseif (y <= 1e+93)
		tmp = Float64(x * Float64(y - Float64(y * y)));
	else
		tmp = t_0;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	t_0 = -(y * (x * y));
	tmp = 0.0;
	if (y <= -9e+15)
		tmp = t_0;
	elseif (y <= 1e+93)
		tmp = x * (y - (y * y));
	else
		tmp = t_0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := Block[{t$95$0 = (-N[(y * N[(x * y), $MachinePrecision]), $MachinePrecision])}, If[LessEqual[y, -9e+15], t$95$0, If[LessEqual[y, 1e+93], N[(x * N[(y - N[(y * y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], t$95$0]]]

Derivation

1. Split input into 2 regimes

2. if y < -9e15 or 1.00000000000000004e93 < y

   1. Initial program 99.8%

      \[\left(x \cdot y\right) \cdot \left(1 - y\right) \]
   2. Add Preprocessing

   3. Taylor expanded in y around inf

      \[\leadsto \left(x \cdot y\right) \cdot \color{blue}{\left(-1 \cdot y\right)} \]
   4. Step-by-step derivation

      1. mul-1-neg N/A

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

      2. lower-neg.f64 99.8

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

   5. Simplified 99.8%

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

   if -9e15 < y < 1.00000000000000004e93

   1. Initial program 99.9%

      \[\left(x \cdot y\right) \cdot \left(1 - y\right) \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

      \[\leadsto \color{blue}{x \cdot \left(y \cdot \left(1 - y\right)\right)} \]
   4. Step-by-step derivation

      1. lower-*.f64 N/A

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

      2. distribute-lft-out-- N/A

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

      3. *-rgt-identity N/A

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

      4. unpow2 N/A

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

      5. lower--.f64 N/A

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

      6. unpow2 N/A

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

      7. lower-*.f64 99.9

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

   5. Simplified 99.9%

      \[\leadsto \color{blue}{x \cdot \left(y - y \cdot y\right)} \]
3. Recombined 2 regimes into one program.

4. Final simplification 99.9%

   \[\leadsto \begin{array}{l} \mathbf{if}\;y \leq -9 \cdot 10^{+15}:\\ \;\;\;\;-y \cdot \left(x \cdot y\right)\\ \mathbf{elif}\;y \leq 10^{+93}:\\ \;\;\;\;x \cdot \left(y - y \cdot y\right)\\ \mathbf{else}:\\ \;\;\;\;-y \cdot \left(x \cdot y\right)\\ \end{array} \]
5. Add Preprocessing

Alternative 2: 97.9% accurate, 0.6× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := -y \cdot \left(x \cdot y\right)\\ \mathbf{if}\;y \leq -1:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;y \leq 1:\\ \;\;\;\;x \cdot y\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (let* ((t_0 (- (* y (* x y)))))
   (if (<= y -1.0) t_0 (if (<= y 1.0) (* x y) t_0))))

C

double code(double x, double y) {
	double t_0 = -(y * (x * y));
	double tmp;
	if (y <= -1.0) {
		tmp = t_0;
	} else if (y <= 1.0) {
		tmp = x * y;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: t_0
    real(8) :: tmp
    t_0 = -(y * (x * y))
    if (y <= (-1.0d0)) then
        tmp = t_0
    else if (y <= 1.0d0) then
        tmp = x * y
    else
        tmp = t_0
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double t_0 = -(y * (x * y));
	double tmp;
	if (y <= -1.0) {
		tmp = t_0;
	} else if (y <= 1.0) {
		tmp = x * y;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Python

def code(x, y):
	t_0 = -(y * (x * y))
	tmp = 0
	if y <= -1.0:
		tmp = t_0
	elif y <= 1.0:
		tmp = x * y
	else:
		tmp = t_0
	return tmp

Julia

function code(x, y)
	t_0 = Float64(-Float64(y * Float64(x * y)))
	tmp = 0.0
	if (y <= -1.0)
		tmp = t_0;
	elseif (y <= 1.0)
		tmp = Float64(x * y);
	else
		tmp = t_0;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	t_0 = -(y * (x * y));
	tmp = 0.0;
	if (y <= -1.0)
		tmp = t_0;
	elseif (y <= 1.0)
		tmp = x * y;
	else
		tmp = t_0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := Block[{t$95$0 = (-N[(y * N[(x * y), $MachinePrecision]), $MachinePrecision])}, If[LessEqual[y, -1.0], t$95$0, If[LessEqual[y, 1.0], N[(x * y), $MachinePrecision], t$95$0]]]

Derivation

1. Split input into 2 regimes

2. if y < -1 or 1 < y

   1. Initial program 99.7%

      \[\left(x \cdot y\right) \cdot \left(1 - y\right) \]
   2. Add Preprocessing

   3. Taylor expanded in y around inf

      \[\leadsto \left(x \cdot y\right) \cdot \color{blue}{\left(-1 \cdot y\right)} \]
   4. Step-by-step derivation

      1. mul-1-neg N/A

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

      2. lower-neg.f64 96.3

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

   5. Simplified 96.3%

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

   if -1 < y < 1

   1. Initial program 100.0%

      \[\left(x \cdot y\right) \cdot \left(1 - y\right) \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

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

      1. lower-*.f64 99.2

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

   5. Simplified 99.2%

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

4. Final simplification 97.8%

   \[\leadsto \begin{array}{l} \mathbf{if}\;y \leq -1:\\ \;\;\;\;-y \cdot \left(x \cdot y\right)\\ \mathbf{elif}\;y \leq 1:\\ \;\;\;\;x \cdot y\\ \mathbf{else}:\\ \;\;\;\;-y \cdot \left(x \cdot y\right)\\ \end{array} \]
5. Add Preprocessing

Alternative 3: 92.5% accurate, 0.6× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := x \cdot \left(y \cdot \left(-y\right)\right)\\ \mathbf{if}\;y \leq -1:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;y \leq 1:\\ \;\;\;\;x \cdot y\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (let* ((t_0 (* x (* y (- y)))))
   (if (<= y -1.0) t_0 (if (<= y 1.0) (* x y) t_0))))

C

double code(double x, double y) {
	double t_0 = x * (y * -y);
	double tmp;
	if (y <= -1.0) {
		tmp = t_0;
	} else if (y <= 1.0) {
		tmp = x * y;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: t_0
    real(8) :: tmp
    t_0 = x * (y * -y)
    if (y <= (-1.0d0)) then
        tmp = t_0
    else if (y <= 1.0d0) then
        tmp = x * y
    else
        tmp = t_0
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double t_0 = x * (y * -y);
	double tmp;
	if (y <= -1.0) {
		tmp = t_0;
	} else if (y <= 1.0) {
		tmp = x * y;
	} else {
		tmp = t_0;
	}
	return tmp;
}

Python

def code(x, y):
	t_0 = x * (y * -y)
	tmp = 0
	if y <= -1.0:
		tmp = t_0
	elif y <= 1.0:
		tmp = x * y
	else:
		tmp = t_0
	return tmp

Julia

function code(x, y)
	t_0 = Float64(x * Float64(y * Float64(-y)))
	tmp = 0.0
	if (y <= -1.0)
		tmp = t_0;
	elseif (y <= 1.0)
		tmp = Float64(x * y);
	else
		tmp = t_0;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	t_0 = x * (y * -y);
	tmp = 0.0;
	if (y <= -1.0)
		tmp = t_0;
	elseif (y <= 1.0)
		tmp = x * y;
	else
		tmp = t_0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := Block[{t$95$0 = N[(x * N[(y * (-y)), $MachinePrecision]), $MachinePrecision]}, If[LessEqual[y, -1.0], t$95$0, If[LessEqual[y, 1.0], N[(x * y), $MachinePrecision], t$95$0]]]

Derivation

1. Split input into 2 regimes

2. if y < -1 or 1 < y

   1. Initial program 99.7%

      \[\left(x \cdot y\right) \cdot \left(1 - y\right) \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. lift--.f64 N/A

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

      2. *-commutative N/A

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

      3. associate-*l* N/A

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

      4. *-commutative N/A

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

      5. lower-*.f64 N/A

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

      6. lift--.f64 N/A

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

      7. sub-neg N/A

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

      8. +-commutative N/A

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

      9. distribute-lft-in N/A

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

      10. *-rgt-identity N/A

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

      11. lower-fma.f64 N/A

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

      12. lower-neg.f64 99.8

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

   4. Applied egg-rr 99.8%

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

   5. Taylor expanded in y around inf

      \[\leadsto \color{blue}{-1 \cdot \left(x \cdot {y}^{2}\right)} \]
   6. Step-by-step derivation

      1. mul-1-neg N/A

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

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

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

      3. lower-*.f64 N/A

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

      4. unpow2 N/A

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

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

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

      6. mul-1-neg N/A

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

      7. lower-*.f64 N/A

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

      8. mul-1-neg N/A

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

      9. lower-neg.f64 82.9

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

   7. Simplified 82.9%

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

   if -1 < y < 1

   1. Initial program 100.0%

      \[\left(x \cdot y\right) \cdot \left(1 - y\right) \]
   2. Add Preprocessing

   3. Taylor expanded in y around 0

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

      1. lower-*.f64 99.2

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

   5. Simplified 99.2%

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

Alternative 4: 99.9% accurate, 1.0× speedup

Math

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

FPCore

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

C

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

Julia

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

Wolfram

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

Derivation

1. Initial program 99.9%

   \[\left(x \cdot y\right) \cdot \left(1 - y\right) \]
2. Add Preprocessing
3. Step-by-step derivation

   1. lift--.f64 N/A

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

   2. *-commutative N/A

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

   3. associate-*l* N/A

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

   4. *-commutative N/A

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

   5. lower-*.f64 N/A

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

   6. lift--.f64 N/A

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

   7. sub-neg N/A

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

   8. +-commutative N/A

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

   9. distribute-lft-in N/A

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

   10. *-rgt-identity N/A

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

   11. lower-fma.f64 N/A

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

   12. lower-neg.f64 99.9

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

4. Applied egg-rr 99.9%

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

5. Final simplification 99.9%

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

Alternative 5: 99.9% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \left(x \cdot y\right) \cdot \left(1 - y\right) \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (* (* x y) (- 1.0 y)))

C

double code(double x, double y) {
	return (x * y) * (1.0 - y);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = (x * y) * (1.0d0 - y)
end function

Java

public static double code(double x, double y) {
	return (x * y) * (1.0 - y);
}

Python

def code(x, y):
	return (x * y) * (1.0 - y)

Julia

function code(x, y)
	return Float64(Float64(x * y) * Float64(1.0 - y))
end

MATLAB

function tmp = code(x, y)
	tmp = (x * y) * (1.0 - y);
end

Wolfram

code[x_, y_] := N[(N[(x * y), $MachinePrecision] * N[(1.0 - y), $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 99.9%

   \[\left(x \cdot y\right) \cdot \left(1 - y\right) \]
2. Add Preprocessing
3. Add Preprocessing

Alternative 6: 57.2% accurate, 2.3× speedup

Math

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

FPCore

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

C

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

Fortran

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

Java

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

Python

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

Julia

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

MATLAB

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

Wolfram

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

Derivation

1. Initial program 99.9%

   \[\left(x \cdot y\right) \cdot \left(1 - y\right) \]
2. Add Preprocessing

3. Taylor expanded in y around 0

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

   1. lower-*.f64 57.0

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

5. Simplified 57.0%

   \[\leadsto \color{blue}{x \cdot y} \]
6. Add Preprocessing

Alternative 7: 4.7% accurate, 4.7× speedup

Math

\[\begin{array}{l} \\ -x \end{array} \]

FPCore

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

C

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

Fortran

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

Java

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

Python

def code(x, y):
	return -x

Julia

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

MATLAB

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

Wolfram

code[x_, y_] := (-x)

Derivation

1. Initial program 99.9%

   \[\left(x \cdot y\right) \cdot \left(1 - y\right) \]
2. Add Preprocessing

4. Applied egg-rr 83.8%

   \[\leadsto \color{blue}{\left(-x \cdot \left(y \cdot \mathsf{fma}\left(y, y, 1\right)\right)\right) \cdot \frac{1}{y + -1}} \]
5. Step-by-step derivation

   1. lift-fma.f64 N/A

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

   2. lift-*.f64 N/A

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

   3. lift-*.f64 N/A

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

   4. lift-neg.f64 N/A

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

   5. lift-+.f64 N/A

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

   6. frac-2neg N/A

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

   7. metadata-eval N/A

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

   8. metadata-eval N/A

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

   9. frac-2neg N/A

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

   10. lift-neg.f64 N/A

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

   11. lift-/.f64 N/A

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

   12. distribute-lft-neg-out N/A

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

   13. lift-*.f64 N/A

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

   14. *-commutative N/A

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

   15. associate-*l* N/A

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

   16. lift-/.f64 N/A

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

   17. un-div-inv N/A

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

6. Applied egg-rr 82.7%

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

7. Taylor expanded in y around inf

   \[\leadsto \mathsf{fma}\left(y, y \cdot y, y\right) \cdot \color{blue}{\left(-1 \cdot \frac{x}{y}\right)} \]
8. Step-by-step derivation

   1. mul-1-neg N/A

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

   2. distribute-neg-frac2 N/A

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

   3. mul-1-neg N/A

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

   4. lower-/.f64 N/A

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

   5. mul-1-neg N/A

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

   6. lower-neg.f64 32.2

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

9. Simplified 32.2%

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

10. Taylor expanded in y around 0

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

    1. mul-1-neg N/A

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

    2. lower-neg.f64 4.5

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

12. Simplified 4.5%

    \[\leadsto \color{blue}{-x} \]
13. Add Preprocessing

Reproduce

herbie shell --seed 2024207 
(FPCore (x y)
  :name "Statistics.Distribution.Binomial:$cvariance from math-functions-0.1.5.2"
  :precision binary64
  (* (* x y) (- 1.0 y)))