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

Percentage Accurate: 99.9% → 99.9%

Time: 4.2s

Alternatives: 7

Speedup: 1.0×

• 24.7% 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

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

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

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

   2. lift-*.f64 N/A

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

   3. associate-*l* N/A

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

   4. *-commutative N/A

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

   5. associate-*r* N/A

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

   6. lower-*.f64 N/A

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

   7. lift--.f64 N/A

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

   8. sub-neg N/A

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

   9. +-commutative N/A

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

   10. distribute-lft-in N/A

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

   11. *-rgt-identity N/A

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

   12. lower-fma.f64 N/A

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

   13. lower-neg.f64 99.9

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

4. Applied rewrites 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 2: 94.3% accurate, 0.4× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;\left(x \cdot y\right) \cdot \left(1 - y\right) \leq -4 \cdot 10^{+154}:\\ \;\;\;\;\left(x \cdot y\right) \cdot \left(-y\right)\\ \mathbf{else}:\\ \;\;\;\;x \cdot \left(y - y \cdot y\right)\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= (* (* x y) (- 1.0 y)) -4e+154) (* (* x y) (- y)) (* x (- y (* y y)))))

C

double code(double x, double y) {
	double tmp;
	if (((x * y) * (1.0 - y)) <= -4e+154) {
		tmp = (x * y) * -y;
	} else {
		tmp = x * (y - (y * y));
	}
	return tmp;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: tmp
    if (((x * y) * (1.0d0 - y)) <= (-4d+154)) then
        tmp = (x * y) * -y
    else
        tmp = x * (y - (y * y))
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double tmp;
	if (((x * y) * (1.0 - y)) <= -4e+154) {
		tmp = (x * y) * -y;
	} else {
		tmp = x * (y - (y * y));
	}
	return tmp;
}

Python

def code(x, y):
	tmp = 0
	if ((x * y) * (1.0 - y)) <= -4e+154:
		tmp = (x * y) * -y
	else:
		tmp = x * (y - (y * y))
	return tmp

Julia

function code(x, y)
	tmp = 0.0
	if (Float64(Float64(x * y) * Float64(1.0 - y)) <= -4e+154)
		tmp = Float64(Float64(x * y) * Float64(-y));
	else
		tmp = Float64(x * Float64(y - Float64(y * y)));
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	tmp = 0.0;
	if (((x * y) * (1.0 - y)) <= -4e+154)
		tmp = (x * y) * -y;
	else
		tmp = x * (y - (y * y));
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := If[LessEqual[N[(N[(x * y), $MachinePrecision] * N[(1.0 - y), $MachinePrecision]), $MachinePrecision], -4e+154], N[(N[(x * y), $MachinePrecision] * (-y)), $MachinePrecision], N[(x * N[(y - N[(y * y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if (*.f64 (*.f64 x y) (-.f64 #s(literal 1 binary64) y)) < -4.00000000000000015e154

   1. Initial program 99.9%

      \[\left(x \cdot y\right) \cdot \left(1 - y\right) \]
   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 92.1

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

   5. Applied rewrites 92.1%

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

   if -4.00000000000000015e154 < (*.f64 (*.f64 x y) (-.f64 #s(literal 1 binary64) y))

   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 94.8

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

   5. Applied rewrites 94.8%

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

Reproduce

herbie shell --seed 2024228 
(FPCore (x y)
  :name "Statistics.Distribution.Binomial:$cvariance from math-functions-0.1.5.2"
  :precision binary64
  (* (* x y) (- 1.0 y)))