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

Percentage Accurate: 99.9% → 99.9%

Time: 5.9s

Alternatives: 7

Speedup: 1.0×

• 25.1% 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, 1.0× speedup

Math

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

FPCore

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

C

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

Julia

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

Wolfram

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

Derivation

1. Initial program 99.9%

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

4. Applied rewrites 99.9%

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

   1. lift-*.f64 N/A

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

   2. *-commutative N/A

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

   3. lift--.f64 N/A

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

   4. sub-neg N/A

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

   5. lift-neg.f64 N/A

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

   6. +-commutative N/A

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

   7. distribute-rgt-in N/A

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

   8. *-lft-identity N/A

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

   9. lower-fma.f64 99.9

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

6. Applied rewrites 99.9%

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

Alternative 2: 97.7% accurate, 0.6× speedup

Math

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

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 99.8%

      \[\left(x \cdot y\right) \cdot \left(1 - y\right) \]
   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 94.8

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

   5. Applied rewrites 94.8%

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

   if -1 < y < 1

   1. Initial program 100.0%

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

   4. Applied rewrites 100.0%

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

      1. lift-*.f64 N/A

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

      2. *-commutative N/A

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

      3. lift--.f64 N/A

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

      4. sub-neg N/A

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

      5. lift-neg.f64 N/A

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

      6. +-commutative N/A

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

      7. distribute-rgt-in N/A

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

      8. *-lft-identity N/A

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

      9. lower-fma.f64 100.0

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

   6. Applied rewrites 100.0%

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

   7. Taylor expanded in y around 0

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

      1. lower-*.f64 98.1

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

   9. Applied rewrites 98.1%

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

4. Final simplification 96.6%

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

Alternative 3: 92.0% accurate, 0.6× speedup

Math

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

FPCore

(FPCore (x y)
 :precision binary64
 (let* ((t_0 (* (* (- y) y) x)))
   (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 * y) * x;
	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 * y) * x
    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 * y) * x;
	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 * y) * x
	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(Float64(-y) * y) * x)
	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 * y) * x;
	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[(N[((-y) * y), $MachinePrecision] * x), $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 99.8%

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

   3. Taylor expanded in y around inf

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

      1. mul-1-neg N/A

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

      2. *-commutative N/A

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

      3. distribute-lft-neg-in N/A

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

      4. lower-*.f64 N/A

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

      5. unpow2 N/A

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

      6. distribute-lft-neg-in N/A

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

      7. mul-1-neg N/A

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

      8. lower-*.f64 N/A

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

      9. mul-1-neg N/A

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

      10. lower-neg.f64 83.1

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

   5. Applied rewrites 83.1%

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

   if -1 < y < 1

   1. Initial program 100.0%

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

   4. Applied rewrites 100.0%

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

      1. lift-*.f64 N/A

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

      2. *-commutative N/A

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

      3. lift--.f64 N/A

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

      4. sub-neg N/A

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

      5. lift-neg.f64 N/A

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

      6. +-commutative N/A

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

      7. distribute-rgt-in N/A

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

      8. *-lft-identity N/A

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

      9. lower-fma.f64 100.0

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

   6. Applied rewrites 100.0%

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

   7. Taylor expanded in y around 0

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

      1. lower-*.f64 98.1

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

   9. Applied rewrites 98.1%

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

Alternative 4: 64.2% accurate, 1.0× speedup

Math

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

FPCore

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

C

double code(double x, double y) {
	double tmp;
	if (y <= 1.0) {
		tmp = x * y;
	} else {
		tmp = -x * 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 <= 1.0d0) then
        tmp = x * y
    else
        tmp = -x * y
    end if
    code = tmp
end function

Java

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

Python

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

Julia

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

MATLAB

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

Wolfram

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

Derivation

1. Split input into 2 regimes

2. if y < 1

   1. Initial program 99.9%

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

   4. Applied rewrites 99.9%

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

      1. lift-*.f64 N/A

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

      2. *-commutative N/A

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

      3. lift--.f64 N/A

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

      4. sub-neg N/A

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

      5. lift-neg.f64 N/A

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

      6. +-commutative N/A

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

      7. distribute-rgt-in N/A

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

      8. *-lft-identity N/A

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

      9. lower-fma.f64 99.9

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

   6. Applied rewrites 99.9%

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

   7. Taylor expanded in y around 0

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

      1. lower-*.f64 74.3

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

   9. Applied rewrites 74.3%

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

   if 1 < y

   1. Initial program 99.8%

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

   4. Applied rewrites 99.8%

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

      1. lift-*.f64 N/A

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

      2. *-commutative N/A

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

      3. lift--.f64 N/A

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

      4. sub-neg N/A

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

      5. lift-neg.f64 N/A

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

      6. +-commutative N/A

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

      7. distribute-rgt-in N/A

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

      8. *-lft-identity N/A

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

      9. lower-fma.f64 99.8

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

   6. Applied rewrites 99.8%

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

   7. Taylor expanded in y around 0

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

      1. lower-*.f64 0.7

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

   9. Applied rewrites 0.7%

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

   11. Applied rewrites 32.7%

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

Alternative 5: 99.9% accurate, 1.0× speedup

Math

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

FPCore

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

C

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

Fortran

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

Java

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

Python

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

Julia

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

MATLAB

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

Wolfram

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

Derivation

1. Initial program 99.9%

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

4. Applied rewrites 99.9%

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

Alternative 6: 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 7: 56.8% 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

4. Applied rewrites 99.9%

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

   1. lift-*.f64 N/A

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

   2. *-commutative N/A

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

   3. lift--.f64 N/A

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

   4. sub-neg N/A

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

   5. lift-neg.f64 N/A

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

   6. +-commutative N/A

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

   7. distribute-rgt-in N/A

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

   8. *-lft-identity N/A

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

   9. lower-fma.f64 99.9

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

6. Applied rewrites 99.9%

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

7. Taylor expanded in y around 0

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

   1. lower-*.f64 57.9

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

9. Applied rewrites 57.9%

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

Reproduce

herbie shell --seed 2024331 
(FPCore (x y)
  :name "Statistics.Distribution.Binomial:$cvariance from math-functions-0.1.5.2"
  :precision binary64
  (* (* x y) (- 1.0 y)))