Radioactive exchange between two surfaces

Percentage Accurate: 85.7% → 94.9%

Time: 15.0s

Alternatives: 7

Speedup: 10.2×

• 60.9% of points produce a very large (infinite) output. You may want to add a precondition.

Specification

Math

\[\begin{array}{l} \\ {x}^{4} - {y}^{4} \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (- (pow x 4.0) (pow y 4.0)))

C

double code(double x, double y) {
	return pow(x, 4.0) - pow(y, 4.0);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = (x ** 4.0d0) - (y ** 4.0d0)
end function

Java

public static double code(double x, double y) {
	return Math.pow(x, 4.0) - Math.pow(y, 4.0);
}

Python

def code(x, y):
	return math.pow(x, 4.0) - math.pow(y, 4.0)

Julia

function code(x, y)
	return Float64((x ^ 4.0) - (y ^ 4.0))
end

MATLAB

function tmp = code(x, y)
	tmp = (x ^ 4.0) - (y ^ 4.0);
end

Wolfram

code[x_, y_] := N[(N[Power[x, 4.0], $MachinePrecision] - N[Power[y, 4.0], $MachinePrecision]), $MachinePrecision]

Initial Program: 85.7% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ {x}^{4} - {y}^{4} \end{array} \]

FPCore

(FPCore (x y) :precision binary64 (- (pow x 4.0) (pow y 4.0)))

C

double code(double x, double y) {
	return pow(x, 4.0) - pow(y, 4.0);
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = (x ** 4.0d0) - (y ** 4.0d0)
end function

Java

public static double code(double x, double y) {
	return Math.pow(x, 4.0) - Math.pow(y, 4.0);
}

Python

def code(x, y):
	return math.pow(x, 4.0) - math.pow(y, 4.0)

Julia

function code(x, y)
	return Float64((x ^ 4.0) - (y ^ 4.0))
end

MATLAB

function tmp = code(x, y)
	tmp = (x ^ 4.0) - (y ^ 4.0);
end

Wolfram

code[x_, y_] := N[(N[Power[x, 4.0], $MachinePrecision] - N[Power[y, 4.0], $MachinePrecision]), $MachinePrecision]

Alternative 1: 94.9% accurate, 9.3× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;y \leq -1.35 \cdot 10^{+154}:\\ \;\;\;\;0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \mathbf{else}:\\ \;\;\;\;\frac{x \cdot x - y \cdot y}{\frac{1}{y \cdot y + x \cdot x}}\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= y -1.35e+154)
   (- 0.0 (* y (* y (* y y))))
   (/ (- (* x x) (* y y)) (/ 1.0 (+ (* y y) (* x x))))))

C

double code(double x, double y) {
	double tmp;
	if (y <= -1.35e+154) {
		tmp = 0.0 - (y * (y * (y * y)));
	} else {
		tmp = ((x * x) - (y * y)) / (1.0 / ((y * y) + (x * x)));
	}
	return tmp;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: tmp
    if (y <= (-1.35d+154)) then
        tmp = 0.0d0 - (y * (y * (y * y)))
    else
        tmp = ((x * x) - (y * y)) / (1.0d0 / ((y * y) + (x * x)))
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double tmp;
	if (y <= -1.35e+154) {
		tmp = 0.0 - (y * (y * (y * y)));
	} else {
		tmp = ((x * x) - (y * y)) / (1.0 / ((y * y) + (x * x)));
	}
	return tmp;
}

Python

def code(x, y):
	tmp = 0
	if y <= -1.35e+154:
		tmp = 0.0 - (y * (y * (y * y)))
	else:
		tmp = ((x * x) - (y * y)) / (1.0 / ((y * y) + (x * x)))
	return tmp

Julia

function code(x, y)
	tmp = 0.0
	if (y <= -1.35e+154)
		tmp = Float64(0.0 - Float64(y * Float64(y * Float64(y * y))));
	else
		tmp = Float64(Float64(Float64(x * x) - Float64(y * y)) / Float64(1.0 / Float64(Float64(y * y) + Float64(x * x))));
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	tmp = 0.0;
	if (y <= -1.35e+154)
		tmp = 0.0 - (y * (y * (y * y)));
	else
		tmp = ((x * x) - (y * y)) / (1.0 / ((y * y) + (x * x)));
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := If[LessEqual[y, -1.35e+154], N[(0.0 - N[(y * N[(y * N[(y * y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], N[(N[(N[(x * x), $MachinePrecision] - N[(y * y), $MachinePrecision]), $MachinePrecision] / N[(1.0 / N[(N[(y * y), $MachinePrecision] + N[(x * x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if y < -1.35000000000000003e154

   1. Initial program 57.1%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

      \[\leadsto \color{blue}{-1 \cdot {y}^{4}} \]
   4. Step-by-step derivation

      1. mul-1-neg N/A

         \[\leadsto \mathsf{neg}\left({y}^{4}\right) \]

      2. neg-sub0 N/A

         \[\leadsto 0 - \color{blue}{{y}^{4}} \]

      3. --lowering--.f64 N/A

         \[\leadsto \mathsf{\_.f64}\left(0, \color{blue}{\left({y}^{4}\right)}\right) \]

      4. pow-lowering-pow.f64 96.4%

         \[\leadsto \mathsf{\_.f64}\left(0, \mathsf{pow.f64}\left(y, \color{blue}{4}\right)\right) \]

   5. Simplified 96.4%

      \[\leadsto \color{blue}{0 - {y}^{4}} \]
   6. Step-by-step derivation

      1. sub0-neg N/A

         \[\leadsto \mathsf{neg}\left({y}^{4}\right) \]

      2. neg-lowering-neg.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{4}\right)\right) \]

      3. metadata-eval N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{\left(3 + 1\right)}\right)\right) \]

      4. pow-plus N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{3} \cdot y\right)\right) \]

      5. cube-unmult N/A

         \[\leadsto \mathsf{neg.f64}\left(\left(\left(y \cdot \left(y \cdot y\right)\right) \cdot y\right)\right) \]

      6. *-commutative N/A

         \[\leadsto \mathsf{neg.f64}\left(\left(y \cdot \left(y \cdot \left(y \cdot y\right)\right)\right)\right) \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \left(y \cdot \left(y \cdot y\right)\right)\right)\right) \]

      8. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, \left(y \cdot y\right)\right)\right)\right) \]

      9. *-lowering-*.f64 96.4%

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, y\right)\right)\right)\right) \]

   7. Applied egg-rr 96.4%

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

   if -1.35000000000000003e154 < y

   1. Initial program 91.2%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {\color{blue}{y}}^{4} \]

      2. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)} \cdot \color{blue}{{y}^{\left(\frac{4}{2}\right)}} \]

      3. difference-of-squares N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right)} \]

      4. *-commutative N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)} \]

      5. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)}\right) \]

      6. --lowering--.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{\left(\frac{4}{2}\right)}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left(\color{blue}{{x}^{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      7. metadata-eval N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{2}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      8. unpow2 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      9. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      10. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{2}\right)\right), \left({x}^{\left(\frac{4}{\color{blue}{2}}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      11. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      12. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      13. +-commutative N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({y}^{\left(\frac{4}{2}\right)} + \color{blue}{{x}^{\left(\frac{4}{2}\right)}}\right)\right) \]

      14. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)}\right)}\right)\right) \]

      15. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{2}\right), \left({x}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      16. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left(y \cdot y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      17. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      18. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({x}^{2}\right)\right)\right) \]

      19. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left(x \cdot \color{blue}{x}\right)\right)\right) \]

      20. *-lowering-*.f64 98.1%

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

   4. Applied egg-rr 98.1%

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

      1. flip3-+ N/A

         \[\leadsto \left(x \cdot x - y \cdot y\right) \cdot \frac{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}} \]

      2. clear-num N/A

         \[\leadsto \left(x \cdot x - y \cdot y\right) \cdot \frac{1}{\color{blue}{\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}}} \]

      3. un-div-inv N/A

         \[\leadsto \frac{x \cdot x - y \cdot y}{\color{blue}{\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}}} \]

      4. /-lowering-/.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\left(x \cdot x - y \cdot y\right), \color{blue}{\left(\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)}\right) \]

      5. --lowering--.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left(y \cdot y\right)\right), \left(\frac{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      6. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left(\frac{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right)} + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \color{blue}{\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      8. clear-num N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{1}{\color{blue}{\frac{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}}\right)\right) \]

      9. flip3-+ N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{1}{y \cdot y + \color{blue}{x \cdot x}}\right)\right) \]

      10. /-lowering-/.f64 N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \color{blue}{\left(y \cdot y + x \cdot x\right)}\right)\right) \]

      11. +-commutative N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \left(x \cdot x + \color{blue}{y \cdot y}\right)\right)\right) \]

      12. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \mathsf{+.f64}\left(\left(x \cdot x\right), \color{blue}{\left(y \cdot y\right)}\right)\right)\right) \]

   6. Applied egg-rr 98.1%

      \[\leadsto \color{blue}{\frac{x \cdot x - y \cdot y}{\frac{1}{x \cdot x + y \cdot y}}} \]
3. Recombined 2 regimes into one program.

4. Final simplification 97.9%

   \[\leadsto \begin{array}{l} \mathbf{if}\;y \leq -1.35 \cdot 10^{+154}:\\ \;\;\;\;0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \mathbf{else}:\\ \;\;\;\;\frac{x \cdot x - y \cdot y}{\frac{1}{y \cdot y + x \cdot x}}\\ \end{array} \]
5. Add Preprocessing

Alternative 2: 89.3% accurate, 7.3× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := x \cdot x - y \cdot y\\ t_1 := \frac{t\_0}{\frac{1}{y \cdot y}}\\ \mathbf{if}\;y \leq -1.35 \cdot 10^{+154}:\\ \;\;\;\;0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \mathbf{elif}\;y \leq -9.2 \cdot 10^{-71}:\\ \;\;\;\;t\_1\\ \mathbf{elif}\;y \leq 1.2 \cdot 10^{-73}:\\ \;\;\;\;\frac{t\_0}{\frac{\frac{1}{x}}{x}}\\ \mathbf{else}:\\ \;\;\;\;t\_1\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (let* ((t_0 (- (* x x) (* y y))) (t_1 (/ t_0 (/ 1.0 (* y y)))))
   (if (<= y -1.35e+154)
     (- 0.0 (* y (* y (* y y))))
     (if (<= y -9.2e-71)
       t_1
       (if (<= y 1.2e-73) (/ t_0 (/ (/ 1.0 x) x)) t_1)))))

C

double code(double x, double y) {
	double t_0 = (x * x) - (y * y);
	double t_1 = t_0 / (1.0 / (y * y));
	double tmp;
	if (y <= -1.35e+154) {
		tmp = 0.0 - (y * (y * (y * y)));
	} else if (y <= -9.2e-71) {
		tmp = t_1;
	} else if (y <= 1.2e-73) {
		tmp = t_0 / ((1.0 / x) / x);
	} else {
		tmp = t_1;
	}
	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) :: t_1
    real(8) :: tmp
    t_0 = (x * x) - (y * y)
    t_1 = t_0 / (1.0d0 / (y * y))
    if (y <= (-1.35d+154)) then
        tmp = 0.0d0 - (y * (y * (y * y)))
    else if (y <= (-9.2d-71)) then
        tmp = t_1
    else if (y <= 1.2d-73) then
        tmp = t_0 / ((1.0d0 / x) / x)
    else
        tmp = t_1
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double t_0 = (x * x) - (y * y);
	double t_1 = t_0 / (1.0 / (y * y));
	double tmp;
	if (y <= -1.35e+154) {
		tmp = 0.0 - (y * (y * (y * y)));
	} else if (y <= -9.2e-71) {
		tmp = t_1;
	} else if (y <= 1.2e-73) {
		tmp = t_0 / ((1.0 / x) / x);
	} else {
		tmp = t_1;
	}
	return tmp;
}

Python

def code(x, y):
	t_0 = (x * x) - (y * y)
	t_1 = t_0 / (1.0 / (y * y))
	tmp = 0
	if y <= -1.35e+154:
		tmp = 0.0 - (y * (y * (y * y)))
	elif y <= -9.2e-71:
		tmp = t_1
	elif y <= 1.2e-73:
		tmp = t_0 / ((1.0 / x) / x)
	else:
		tmp = t_1
	return tmp

Julia

function code(x, y)
	t_0 = Float64(Float64(x * x) - Float64(y * y))
	t_1 = Float64(t_0 / Float64(1.0 / Float64(y * y)))
	tmp = 0.0
	if (y <= -1.35e+154)
		tmp = Float64(0.0 - Float64(y * Float64(y * Float64(y * y))));
	elseif (y <= -9.2e-71)
		tmp = t_1;
	elseif (y <= 1.2e-73)
		tmp = Float64(t_0 / Float64(Float64(1.0 / x) / x));
	else
		tmp = t_1;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	t_0 = (x * x) - (y * y);
	t_1 = t_0 / (1.0 / (y * y));
	tmp = 0.0;
	if (y <= -1.35e+154)
		tmp = 0.0 - (y * (y * (y * y)));
	elseif (y <= -9.2e-71)
		tmp = t_1;
	elseif (y <= 1.2e-73)
		tmp = t_0 / ((1.0 / x) / x);
	else
		tmp = t_1;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := Block[{t$95$0 = N[(N[(x * x), $MachinePrecision] - N[(y * y), $MachinePrecision]), $MachinePrecision]}, Block[{t$95$1 = N[(t$95$0 / N[(1.0 / N[(y * y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]}, If[LessEqual[y, -1.35e+154], N[(0.0 - N[(y * N[(y * N[(y * y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], If[LessEqual[y, -9.2e-71], t$95$1, If[LessEqual[y, 1.2e-73], N[(t$95$0 / N[(N[(1.0 / x), $MachinePrecision] / x), $MachinePrecision]), $MachinePrecision], t$95$1]]]]]

Derivation

1. Split input into 3 regimes

2. if y < -1.35000000000000003e154

   1. Initial program 57.1%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

      \[\leadsto \color{blue}{-1 \cdot {y}^{4}} \]
   4. Step-by-step derivation

      1. mul-1-neg N/A

         \[\leadsto \mathsf{neg}\left({y}^{4}\right) \]

      2. neg-sub0 N/A

         \[\leadsto 0 - \color{blue}{{y}^{4}} \]

      3. --lowering--.f64 N/A

         \[\leadsto \mathsf{\_.f64}\left(0, \color{blue}{\left({y}^{4}\right)}\right) \]

      4. pow-lowering-pow.f64 96.4%

         \[\leadsto \mathsf{\_.f64}\left(0, \mathsf{pow.f64}\left(y, \color{blue}{4}\right)\right) \]

   5. Simplified 96.4%

      \[\leadsto \color{blue}{0 - {y}^{4}} \]
   6. Step-by-step derivation

      1. sub0-neg N/A

         \[\leadsto \mathsf{neg}\left({y}^{4}\right) \]

      2. neg-lowering-neg.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{4}\right)\right) \]

      3. metadata-eval N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{\left(3 + 1\right)}\right)\right) \]

      4. pow-plus N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{3} \cdot y\right)\right) \]

      5. cube-unmult N/A

         \[\leadsto \mathsf{neg.f64}\left(\left(\left(y \cdot \left(y \cdot y\right)\right) \cdot y\right)\right) \]

      6. *-commutative N/A

         \[\leadsto \mathsf{neg.f64}\left(\left(y \cdot \left(y \cdot \left(y \cdot y\right)\right)\right)\right) \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \left(y \cdot \left(y \cdot y\right)\right)\right)\right) \]

      8. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, \left(y \cdot y\right)\right)\right)\right) \]

      9. *-lowering-*.f64 96.4%

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, y\right)\right)\right)\right) \]

   7. Applied egg-rr 96.4%

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

   if -1.35000000000000003e154 < y < -9.1999999999999994e-71 or 1.20000000000000003e-73 < y

   1. Initial program 81.3%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {\color{blue}{y}}^{4} \]

      2. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)} \cdot \color{blue}{{y}^{\left(\frac{4}{2}\right)}} \]

      3. difference-of-squares N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right)} \]

      4. *-commutative N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)} \]

      5. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)}\right) \]

      6. --lowering--.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{\left(\frac{4}{2}\right)}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left(\color{blue}{{x}^{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      7. metadata-eval N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{2}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      8. unpow2 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      9. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      10. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{2}\right)\right), \left({x}^{\left(\frac{4}{\color{blue}{2}}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      11. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      12. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      13. +-commutative N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({y}^{\left(\frac{4}{2}\right)} + \color{blue}{{x}^{\left(\frac{4}{2}\right)}}\right)\right) \]

      14. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)}\right)}\right)\right) \]

      15. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{2}\right), \left({x}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      16. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left(y \cdot y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      17. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      18. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({x}^{2}\right)\right)\right) \]

      19. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left(x \cdot \color{blue}{x}\right)\right)\right) \]

      20. *-lowering-*.f64 96.1%

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

   4. Applied egg-rr 96.1%

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

      1. flip3-+ N/A

         \[\leadsto \left(x \cdot x - y \cdot y\right) \cdot \frac{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}} \]

      2. clear-num N/A

         \[\leadsto \left(x \cdot x - y \cdot y\right) \cdot \frac{1}{\color{blue}{\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}}} \]

      3. un-div-inv N/A

         \[\leadsto \frac{x \cdot x - y \cdot y}{\color{blue}{\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}}} \]

      4. /-lowering-/.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\left(x \cdot x - y \cdot y\right), \color{blue}{\left(\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)}\right) \]

      5. --lowering--.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left(y \cdot y\right)\right), \left(\frac{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      6. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left(\frac{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right)} + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \color{blue}{\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      8. clear-num N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{1}{\color{blue}{\frac{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}}\right)\right) \]

      9. flip3-+ N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{1}{y \cdot y + \color{blue}{x \cdot x}}\right)\right) \]

      10. /-lowering-/.f64 N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \color{blue}{\left(y \cdot y + x \cdot x\right)}\right)\right) \]

      11. +-commutative N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \left(x \cdot x + \color{blue}{y \cdot y}\right)\right)\right) \]

      12. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \mathsf{+.f64}\left(\left(x \cdot x\right), \color{blue}{\left(y \cdot y\right)}\right)\right)\right) \]

   6. Applied egg-rr 96.1%

      \[\leadsto \color{blue}{\frac{x \cdot x - y \cdot y}{\frac{1}{x \cdot x + y \cdot y}}} \]

   7. Taylor expanded in x around 0

      \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \color{blue}{\left(\frac{1}{{y}^{2}}\right)}\right) \]
   8. Step-by-step derivation

      1. /-lowering-/.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \color{blue}{\left({y}^{2}\right)}\right)\right) \]

      2. unpow2 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \left(y \cdot \color{blue}{y}\right)\right)\right) \]

      3. *-lowering-*.f64 94.3%

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \mathsf{*.f64}\left(y, \color{blue}{y}\right)\right)\right) \]

   9. Simplified 94.3%

      \[\leadsto \frac{x \cdot x - y \cdot y}{\color{blue}{\frac{1}{y \cdot y}}} \]

   if -9.1999999999999994e-71 < y < 1.20000000000000003e-73

   1. Initial program 100.0%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {\color{blue}{y}}^{4} \]

      2. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)} \cdot \color{blue}{{y}^{\left(\frac{4}{2}\right)}} \]

      3. difference-of-squares N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right)} \]

      4. *-commutative N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)} \]

      5. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)}\right) \]

      6. --lowering--.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{\left(\frac{4}{2}\right)}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left(\color{blue}{{x}^{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      7. metadata-eval N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{2}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      8. unpow2 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      9. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      10. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{2}\right)\right), \left({x}^{\left(\frac{4}{\color{blue}{2}}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      11. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      12. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      13. +-commutative N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({y}^{\left(\frac{4}{2}\right)} + \color{blue}{{x}^{\left(\frac{4}{2}\right)}}\right)\right) \]

      14. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)}\right)}\right)\right) \]

      15. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{2}\right), \left({x}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      16. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left(y \cdot y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      17. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      18. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({x}^{2}\right)\right)\right) \]

      19. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left(x \cdot \color{blue}{x}\right)\right)\right) \]

      20. *-lowering-*.f64 99.8%

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

   4. Applied egg-rr 99.8%

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

      1. flip3-+ N/A

         \[\leadsto \left(x \cdot x - y \cdot y\right) \cdot \frac{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}} \]

      2. clear-num N/A

         \[\leadsto \left(x \cdot x - y \cdot y\right) \cdot \frac{1}{\color{blue}{\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}}} \]

      3. un-div-inv N/A

         \[\leadsto \frac{x \cdot x - y \cdot y}{\color{blue}{\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}}} \]

      4. /-lowering-/.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\left(x \cdot x - y \cdot y\right), \color{blue}{\left(\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)}\right) \]

      5. --lowering--.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left(y \cdot y\right)\right), \left(\frac{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      6. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left(\frac{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right)} + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \color{blue}{\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      8. clear-num N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{1}{\color{blue}{\frac{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}}\right)\right) \]

      9. flip3-+ N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{1}{y \cdot y + \color{blue}{x \cdot x}}\right)\right) \]

      10. /-lowering-/.f64 N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \color{blue}{\left(y \cdot y + x \cdot x\right)}\right)\right) \]

      11. +-commutative N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \left(x \cdot x + \color{blue}{y \cdot y}\right)\right)\right) \]

      12. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \mathsf{+.f64}\left(\left(x \cdot x\right), \color{blue}{\left(y \cdot y\right)}\right)\right)\right) \]

   6. Applied egg-rr 99.9%

      \[\leadsto \color{blue}{\frac{x \cdot x - y \cdot y}{\frac{1}{x \cdot x + y \cdot y}}} \]

   7. Taylor expanded in x around inf

      \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \color{blue}{\left(\frac{1}{{x}^{2}}\right)}\right) \]
   8. Step-by-step derivation

      1. /-lowering-/.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \color{blue}{\left({x}^{2}\right)}\right)\right) \]

      2. unpow2 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \left(x \cdot \color{blue}{x}\right)\right)\right) \]

      3. *-lowering-*.f64 99.4%

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

   9. Simplified 99.4%

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

       1. associate-/r* N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{\frac{1}{x}}{\color{blue}{x}}\right)\right) \]

       2. /-lowering-/.f64 N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(\left(\frac{1}{x}\right), \color{blue}{x}\right)\right) \]

       3. /-lowering-/.f64 99.4%

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(\mathsf{/.f64}\left(1, x\right), x\right)\right) \]

   11. Applied egg-rr 99.4%

       \[\leadsto \frac{x \cdot x - y \cdot y}{\color{blue}{\frac{\frac{1}{x}}{x}}} \]
3. Recombined 3 regimes into one program.

4. Final simplification 96.9%

   \[\leadsto \begin{array}{l} \mathbf{if}\;y \leq -1.35 \cdot 10^{+154}:\\ \;\;\;\;0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \mathbf{elif}\;y \leq -9.2 \cdot 10^{-71}:\\ \;\;\;\;\frac{x \cdot x - y \cdot y}{\frac{1}{y \cdot y}}\\ \mathbf{elif}\;y \leq 1.2 \cdot 10^{-73}:\\ \;\;\;\;\frac{x \cdot x - y \cdot y}{\frac{\frac{1}{x}}{x}}\\ \mathbf{else}:\\ \;\;\;\;\frac{x \cdot x - y \cdot y}{\frac{1}{y \cdot y}}\\ \end{array} \]
5. Add Preprocessing

Alternative 3: 89.3% accurate, 7.3× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{x \cdot x - y \cdot y}{\frac{1}{y \cdot y}}\\ \mathbf{if}\;y \leq -1.35 \cdot 10^{+154}:\\ \;\;\;\;0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \mathbf{elif}\;y \leq -2.9 \cdot 10^{-66}:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;y \leq 7.4 \cdot 10^{-79}:\\ \;\;\;\;x \cdot \left(x \cdot \left(x \cdot x\right)\right)\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (let* ((t_0 (/ (- (* x x) (* y y)) (/ 1.0 (* y y)))))
   (if (<= y -1.35e+154)
     (- 0.0 (* y (* y (* y y))))
     (if (<= y -2.9e-66) t_0 (if (<= y 7.4e-79) (* x (* x (* x x))) t_0)))))

C

double code(double x, double y) {
	double t_0 = ((x * x) - (y * y)) / (1.0 / (y * y));
	double tmp;
	if (y <= -1.35e+154) {
		tmp = 0.0 - (y * (y * (y * y)));
	} else if (y <= -2.9e-66) {
		tmp = t_0;
	} else if (y <= 7.4e-79) {
		tmp = x * (x * (x * x));
	} 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 * x) - (y * y)) / (1.0d0 / (y * y))
    if (y <= (-1.35d+154)) then
        tmp = 0.0d0 - (y * (y * (y * y)))
    else if (y <= (-2.9d-66)) then
        tmp = t_0
    else if (y <= 7.4d-79) then
        tmp = x * (x * (x * x))
    else
        tmp = t_0
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double t_0 = ((x * x) - (y * y)) / (1.0 / (y * y));
	double tmp;
	if (y <= -1.35e+154) {
		tmp = 0.0 - (y * (y * (y * y)));
	} else if (y <= -2.9e-66) {
		tmp = t_0;
	} else if (y <= 7.4e-79) {
		tmp = x * (x * (x * x));
	} else {
		tmp = t_0;
	}
	return tmp;
}

Python

def code(x, y):
	t_0 = ((x * x) - (y * y)) / (1.0 / (y * y))
	tmp = 0
	if y <= -1.35e+154:
		tmp = 0.0 - (y * (y * (y * y)))
	elif y <= -2.9e-66:
		tmp = t_0
	elif y <= 7.4e-79:
		tmp = x * (x * (x * x))
	else:
		tmp = t_0
	return tmp

Julia

function code(x, y)
	t_0 = Float64(Float64(Float64(x * x) - Float64(y * y)) / Float64(1.0 / Float64(y * y)))
	tmp = 0.0
	if (y <= -1.35e+154)
		tmp = Float64(0.0 - Float64(y * Float64(y * Float64(y * y))));
	elseif (y <= -2.9e-66)
		tmp = t_0;
	elseif (y <= 7.4e-79)
		tmp = Float64(x * Float64(x * Float64(x * x)));
	else
		tmp = t_0;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	t_0 = ((x * x) - (y * y)) / (1.0 / (y * y));
	tmp = 0.0;
	if (y <= -1.35e+154)
		tmp = 0.0 - (y * (y * (y * y)));
	elseif (y <= -2.9e-66)
		tmp = t_0;
	elseif (y <= 7.4e-79)
		tmp = x * (x * (x * x));
	else
		tmp = t_0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := Block[{t$95$0 = N[(N[(N[(x * x), $MachinePrecision] - N[(y * y), $MachinePrecision]), $MachinePrecision] / N[(1.0 / N[(y * y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]}, If[LessEqual[y, -1.35e+154], N[(0.0 - N[(y * N[(y * N[(y * y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], If[LessEqual[y, -2.9e-66], t$95$0, If[LessEqual[y, 7.4e-79], N[(x * N[(x * N[(x * x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], t$95$0]]]]

Derivation

1. Split input into 3 regimes

2. if y < -1.35000000000000003e154

   1. Initial program 57.1%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

      \[\leadsto \color{blue}{-1 \cdot {y}^{4}} \]
   4. Step-by-step derivation

      1. mul-1-neg N/A

         \[\leadsto \mathsf{neg}\left({y}^{4}\right) \]

      2. neg-sub0 N/A

         \[\leadsto 0 - \color{blue}{{y}^{4}} \]

      3. --lowering--.f64 N/A

         \[\leadsto \mathsf{\_.f64}\left(0, \color{blue}{\left({y}^{4}\right)}\right) \]

      4. pow-lowering-pow.f64 96.4%

         \[\leadsto \mathsf{\_.f64}\left(0, \mathsf{pow.f64}\left(y, \color{blue}{4}\right)\right) \]

   5. Simplified 96.4%

      \[\leadsto \color{blue}{0 - {y}^{4}} \]
   6. Step-by-step derivation

      1. sub0-neg N/A

         \[\leadsto \mathsf{neg}\left({y}^{4}\right) \]

      2. neg-lowering-neg.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{4}\right)\right) \]

      3. metadata-eval N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{\left(3 + 1\right)}\right)\right) \]

      4. pow-plus N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{3} \cdot y\right)\right) \]

      5. cube-unmult N/A

         \[\leadsto \mathsf{neg.f64}\left(\left(\left(y \cdot \left(y \cdot y\right)\right) \cdot y\right)\right) \]

      6. *-commutative N/A

         \[\leadsto \mathsf{neg.f64}\left(\left(y \cdot \left(y \cdot \left(y \cdot y\right)\right)\right)\right) \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \left(y \cdot \left(y \cdot y\right)\right)\right)\right) \]

      8. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, \left(y \cdot y\right)\right)\right)\right) \]

      9. *-lowering-*.f64 96.4%

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, y\right)\right)\right)\right) \]

   7. Applied egg-rr 96.4%

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

   if -1.35000000000000003e154 < y < -2.90000000000000011e-66 or 7.40000000000000035e-79 < y

   1. Initial program 81.3%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {\color{blue}{y}}^{4} \]

      2. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)} \cdot \color{blue}{{y}^{\left(\frac{4}{2}\right)}} \]

      3. difference-of-squares N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right)} \]

      4. *-commutative N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)} \]

      5. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)}\right) \]

      6. --lowering--.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{\left(\frac{4}{2}\right)}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left(\color{blue}{{x}^{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      7. metadata-eval N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{2}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      8. unpow2 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      9. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      10. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{2}\right)\right), \left({x}^{\left(\frac{4}{\color{blue}{2}}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      11. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      12. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      13. +-commutative N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({y}^{\left(\frac{4}{2}\right)} + \color{blue}{{x}^{\left(\frac{4}{2}\right)}}\right)\right) \]

      14. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)}\right)}\right)\right) \]

      15. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{2}\right), \left({x}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      16. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left(y \cdot y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      17. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      18. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({x}^{2}\right)\right)\right) \]

      19. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left(x \cdot \color{blue}{x}\right)\right)\right) \]

      20. *-lowering-*.f64 96.1%

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

   4. Applied egg-rr 96.1%

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

      1. flip3-+ N/A

         \[\leadsto \left(x \cdot x - y \cdot y\right) \cdot \frac{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}} \]

      2. clear-num N/A

         \[\leadsto \left(x \cdot x - y \cdot y\right) \cdot \frac{1}{\color{blue}{\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}}} \]

      3. un-div-inv N/A

         \[\leadsto \frac{x \cdot x - y \cdot y}{\color{blue}{\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}}} \]

      4. /-lowering-/.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\left(x \cdot x - y \cdot y\right), \color{blue}{\left(\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)}\right) \]

      5. --lowering--.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left(y \cdot y\right)\right), \left(\frac{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      6. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left(\frac{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right)} + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \color{blue}{\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      8. clear-num N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{1}{\color{blue}{\frac{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}}\right)\right) \]

      9. flip3-+ N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{1}{y \cdot y + \color{blue}{x \cdot x}}\right)\right) \]

      10. /-lowering-/.f64 N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \color{blue}{\left(y \cdot y + x \cdot x\right)}\right)\right) \]

      11. +-commutative N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \left(x \cdot x + \color{blue}{y \cdot y}\right)\right)\right) \]

      12. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \mathsf{+.f64}\left(\left(x \cdot x\right), \color{blue}{\left(y \cdot y\right)}\right)\right)\right) \]

   6. Applied egg-rr 96.1%

      \[\leadsto \color{blue}{\frac{x \cdot x - y \cdot y}{\frac{1}{x \cdot x + y \cdot y}}} \]

   7. Taylor expanded in x around 0

      \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \color{blue}{\left(\frac{1}{{y}^{2}}\right)}\right) \]
   8. Step-by-step derivation

      1. /-lowering-/.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \color{blue}{\left({y}^{2}\right)}\right)\right) \]

      2. unpow2 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \left(y \cdot \color{blue}{y}\right)\right)\right) \]

      3. *-lowering-*.f64 94.3%

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \mathsf{*.f64}\left(y, \color{blue}{y}\right)\right)\right) \]

   9. Simplified 94.3%

      \[\leadsto \frac{x \cdot x - y \cdot y}{\color{blue}{\frac{1}{y \cdot y}}} \]

   if -2.90000000000000011e-66 < y < 7.40000000000000035e-79

   1. Initial program 100.0%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {\color{blue}{y}}^{4} \]

      2. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)} \cdot \color{blue}{{y}^{\left(\frac{4}{2}\right)}} \]

      3. difference-of-squares N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right)} \]

      4. *-commutative N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)} \]

      5. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)}\right) \]

      6. --lowering--.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{\left(\frac{4}{2}\right)}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left(\color{blue}{{x}^{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      7. metadata-eval N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{2}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      8. unpow2 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      9. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      10. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{2}\right)\right), \left({x}^{\left(\frac{4}{\color{blue}{2}}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      11. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      12. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      13. +-commutative N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({y}^{\left(\frac{4}{2}\right)} + \color{blue}{{x}^{\left(\frac{4}{2}\right)}}\right)\right) \]

      14. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)}\right)}\right)\right) \]

      15. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{2}\right), \left({x}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      16. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left(y \cdot y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      17. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      18. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({x}^{2}\right)\right)\right) \]

      19. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left(x \cdot \color{blue}{x}\right)\right)\right) \]

      20. *-lowering-*.f64 99.8%

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

   4. Applied egg-rr 99.8%

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

   5. Taylor expanded in x around inf

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

      1. metadata-eval N/A

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

      2. pow-sqr N/A

         \[\leadsto {x}^{2} \cdot \color{blue}{{x}^{2}} \]

      3. unpow2 N/A

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

      4. associate-*r* N/A

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

      5. unpow2 N/A

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

      6. cube-mult N/A

         \[\leadsto x \cdot {x}^{\color{blue}{3}} \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(x, \color{blue}{\left({x}^{3}\right)}\right) \]

      8. cube-mult N/A

         \[\leadsto \mathsf{*.f64}\left(x, \left(x \cdot \color{blue}{\left(x \cdot x\right)}\right)\right) \]

      9. unpow2 N/A

         \[\leadsto \mathsf{*.f64}\left(x, \left(x \cdot {x}^{\color{blue}{2}}\right)\right) \]

      10. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(x, \mathsf{*.f64}\left(x, \color{blue}{\left({x}^{2}\right)}\right)\right) \]

      11. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(x, \mathsf{*.f64}\left(x, \left(x \cdot \color{blue}{x}\right)\right)\right) \]

      12. *-lowering-*.f64 99.4%

          \[\leadsto \mathsf{*.f64}\left(x, \mathsf{*.f64}\left(x, \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

   7. Simplified 99.4%

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

4. Final simplification 96.9%

   \[\leadsto \begin{array}{l} \mathbf{if}\;y \leq -1.35 \cdot 10^{+154}:\\ \;\;\;\;0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \mathbf{elif}\;y \leq -2.9 \cdot 10^{-66}:\\ \;\;\;\;\frac{x \cdot x - y \cdot y}{\frac{1}{y \cdot y}}\\ \mathbf{elif}\;y \leq 7.4 \cdot 10^{-79}:\\ \;\;\;\;x \cdot \left(x \cdot \left(x \cdot x\right)\right)\\ \mathbf{else}:\\ \;\;\;\;\frac{x \cdot x - y \cdot y}{\frac{1}{y \cdot y}}\\ \end{array} \]
5. Add Preprocessing

Alternative 4: 88.1% accurate, 8.9× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{x \cdot x - y \cdot y}{\frac{1}{x \cdot x}}\\ \mathbf{if}\;x \leq -3.4 \cdot 10^{-39}:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;x \leq 2.25 \cdot 10^{-58}:\\ \;\;\;\;0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (let* ((t_0 (/ (- (* x x) (* y y)) (/ 1.0 (* x x)))))
   (if (<= x -3.4e-39)
     t_0
     (if (<= x 2.25e-58) (- 0.0 (* y (* y (* y y)))) t_0))))

C

double code(double x, double y) {
	double t_0 = ((x * x) - (y * y)) / (1.0 / (x * x));
	double tmp;
	if (x <= -3.4e-39) {
		tmp = t_0;
	} else if (x <= 2.25e-58) {
		tmp = 0.0 - (y * (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 = ((x * x) - (y * y)) / (1.0d0 / (x * x))
    if (x <= (-3.4d-39)) then
        tmp = t_0
    else if (x <= 2.25d-58) then
        tmp = 0.0d0 - (y * (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 = ((x * x) - (y * y)) / (1.0 / (x * x));
	double tmp;
	if (x <= -3.4e-39) {
		tmp = t_0;
	} else if (x <= 2.25e-58) {
		tmp = 0.0 - (y * (y * (y * y)));
	} else {
		tmp = t_0;
	}
	return tmp;
}

Python

def code(x, y):
	t_0 = ((x * x) - (y * y)) / (1.0 / (x * x))
	tmp = 0
	if x <= -3.4e-39:
		tmp = t_0
	elif x <= 2.25e-58:
		tmp = 0.0 - (y * (y * (y * y)))
	else:
		tmp = t_0
	return tmp

Julia

function code(x, y)
	t_0 = Float64(Float64(Float64(x * x) - Float64(y * y)) / Float64(1.0 / Float64(x * x)))
	tmp = 0.0
	if (x <= -3.4e-39)
		tmp = t_0;
	elseif (x <= 2.25e-58)
		tmp = Float64(0.0 - Float64(y * Float64(y * Float64(y * y))));
	else
		tmp = t_0;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	t_0 = ((x * x) - (y * y)) / (1.0 / (x * x));
	tmp = 0.0;
	if (x <= -3.4e-39)
		tmp = t_0;
	elseif (x <= 2.25e-58)
		tmp = 0.0 - (y * (y * (y * y)));
	else
		tmp = t_0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := Block[{t$95$0 = N[(N[(N[(x * x), $MachinePrecision] - N[(y * y), $MachinePrecision]), $MachinePrecision] / N[(1.0 / N[(x * x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]}, If[LessEqual[x, -3.4e-39], t$95$0, If[LessEqual[x, 2.25e-58], N[(0.0 - N[(y * N[(y * N[(y * y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], t$95$0]]]

Derivation

1. Split input into 2 regimes

2. if x < -3.3999999999999999e-39 or 2.2500000000000001e-58 < x

   1. Initial program 77.0%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {\color{blue}{y}}^{4} \]

      2. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)} \cdot \color{blue}{{y}^{\left(\frac{4}{2}\right)}} \]

      3. difference-of-squares N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right)} \]

      4. *-commutative N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)} \]

      5. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)}\right) \]

      6. --lowering--.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{\left(\frac{4}{2}\right)}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left(\color{blue}{{x}^{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      7. metadata-eval N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{2}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      8. unpow2 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      9. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      10. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{2}\right)\right), \left({x}^{\left(\frac{4}{\color{blue}{2}}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      11. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      12. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      13. +-commutative N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({y}^{\left(\frac{4}{2}\right)} + \color{blue}{{x}^{\left(\frac{4}{2}\right)}}\right)\right) \]

      14. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)}\right)}\right)\right) \]

      15. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{2}\right), \left({x}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      16. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left(y \cdot y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      17. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      18. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({x}^{2}\right)\right)\right) \]

      19. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left(x \cdot \color{blue}{x}\right)\right)\right) \]

      20. *-lowering-*.f64 91.2%

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

   4. Applied egg-rr 91.2%

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

      1. flip3-+ N/A

         \[\leadsto \left(x \cdot x - y \cdot y\right) \cdot \frac{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}} \]

      2. clear-num N/A

         \[\leadsto \left(x \cdot x - y \cdot y\right) \cdot \frac{1}{\color{blue}{\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}}} \]

      3. un-div-inv N/A

         \[\leadsto \frac{x \cdot x - y \cdot y}{\color{blue}{\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}}} \]

      4. /-lowering-/.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\left(x \cdot x - y \cdot y\right), \color{blue}{\left(\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)}\right) \]

      5. --lowering--.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left(y \cdot y\right)\right), \left(\frac{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      6. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left(\frac{\color{blue}{\left(y \cdot y\right) \cdot \left(y \cdot y\right)} + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \color{blue}{\left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}\right)\right) \]

      8. clear-num N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{1}{\color{blue}{\frac{{\left(y \cdot y\right)}^{3} + {\left(x \cdot x\right)}^{3}}{\left(y \cdot y\right) \cdot \left(y \cdot y\right) + \left(\left(x \cdot x\right) \cdot \left(x \cdot x\right) - \left(y \cdot y\right) \cdot \left(x \cdot x\right)\right)}}}\right)\right) \]

      9. flip3-+ N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left(\frac{1}{y \cdot y + \color{blue}{x \cdot x}}\right)\right) \]

      10. /-lowering-/.f64 N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \color{blue}{\left(y \cdot y + x \cdot x\right)}\right)\right) \]

      11. +-commutative N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \left(x \cdot x + \color{blue}{y \cdot y}\right)\right)\right) \]

      12. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \mathsf{+.f64}\left(\left(x \cdot x\right), \color{blue}{\left(y \cdot y\right)}\right)\right)\right) \]

   6. Applied egg-rr 91.2%

      \[\leadsto \color{blue}{\frac{x \cdot x - y \cdot y}{\frac{1}{x \cdot x + y \cdot y}}} \]

   7. Taylor expanded in x around inf

      \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \color{blue}{\left(\frac{1}{{x}^{2}}\right)}\right) \]
   8. Step-by-step derivation

      1. /-lowering-/.f64 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \color{blue}{\left({x}^{2}\right)}\right)\right) \]

      2. unpow2 N/A

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \left(x \cdot \color{blue}{x}\right)\right)\right) \]

      3. *-lowering-*.f64 85.2%

         \[\leadsto \mathsf{/.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{/.f64}\left(1, \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

   9. Simplified 85.2%

      \[\leadsto \frac{x \cdot x - y \cdot y}{\color{blue}{\frac{1}{x \cdot x}}} \]

   if -3.3999999999999999e-39 < x < 2.2500000000000001e-58

   1. Initial program 100.0%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

      \[\leadsto \color{blue}{-1 \cdot {y}^{4}} \]
   4. Step-by-step derivation

      1. mul-1-neg N/A

         \[\leadsto \mathsf{neg}\left({y}^{4}\right) \]

      2. neg-sub0 N/A

         \[\leadsto 0 - \color{blue}{{y}^{4}} \]

      3. --lowering--.f64 N/A

         \[\leadsto \mathsf{\_.f64}\left(0, \color{blue}{\left({y}^{4}\right)}\right) \]

      4. pow-lowering-pow.f64 97.6%

         \[\leadsto \mathsf{\_.f64}\left(0, \mathsf{pow.f64}\left(y, \color{blue}{4}\right)\right) \]

   5. Simplified 97.6%

      \[\leadsto \color{blue}{0 - {y}^{4}} \]
   6. Step-by-step derivation

      1. sub0-neg N/A

         \[\leadsto \mathsf{neg}\left({y}^{4}\right) \]

      2. neg-lowering-neg.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{4}\right)\right) \]

      3. metadata-eval N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{\left(3 + 1\right)}\right)\right) \]

      4. pow-plus N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{3} \cdot y\right)\right) \]

      5. cube-unmult N/A

         \[\leadsto \mathsf{neg.f64}\left(\left(\left(y \cdot \left(y \cdot y\right)\right) \cdot y\right)\right) \]

      6. *-commutative N/A

         \[\leadsto \mathsf{neg.f64}\left(\left(y \cdot \left(y \cdot \left(y \cdot y\right)\right)\right)\right) \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \left(y \cdot \left(y \cdot y\right)\right)\right)\right) \]

      8. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, \left(y \cdot y\right)\right)\right)\right) \]

      9. *-lowering-*.f64 97.5%

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, y\right)\right)\right)\right) \]

   7. Applied egg-rr 97.5%

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

4. Final simplification 90.8%

   \[\leadsto \begin{array}{l} \mathbf{if}\;x \leq -3.4 \cdot 10^{-39}:\\ \;\;\;\;\frac{x \cdot x - y \cdot y}{\frac{1}{x \cdot x}}\\ \mathbf{elif}\;x \leq 2.25 \cdot 10^{-58}:\\ \;\;\;\;0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \mathbf{else}:\\ \;\;\;\;\frac{x \cdot x - y \cdot y}{\frac{1}{x \cdot x}}\\ \end{array} \]
5. Add Preprocessing

Alternative 5: 94.9% accurate, 10.2× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;y \leq -1.35 \cdot 10^{+154}:\\ \;\;\;\;0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \mathbf{else}:\\ \;\;\;\;\left(x \cdot x - y \cdot y\right) \cdot \left(y \cdot y + x \cdot x\right)\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (if (<= y -1.35e+154)
   (- 0.0 (* y (* y (* y y))))
   (* (- (* x x) (* y y)) (+ (* y y) (* x x)))))

C

double code(double x, double y) {
	double tmp;
	if (y <= -1.35e+154) {
		tmp = 0.0 - (y * (y * (y * y)));
	} else {
		tmp = ((x * x) - (y * y)) * ((y * y) + (x * x));
	}
	return tmp;
}

Fortran

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8) :: tmp
    if (y <= (-1.35d+154)) then
        tmp = 0.0d0 - (y * (y * (y * y)))
    else
        tmp = ((x * x) - (y * y)) * ((y * y) + (x * x))
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double tmp;
	if (y <= -1.35e+154) {
		tmp = 0.0 - (y * (y * (y * y)));
	} else {
		tmp = ((x * x) - (y * y)) * ((y * y) + (x * x));
	}
	return tmp;
}

Python

def code(x, y):
	tmp = 0
	if y <= -1.35e+154:
		tmp = 0.0 - (y * (y * (y * y)))
	else:
		tmp = ((x * x) - (y * y)) * ((y * y) + (x * x))
	return tmp

Julia

function code(x, y)
	tmp = 0.0
	if (y <= -1.35e+154)
		tmp = Float64(0.0 - Float64(y * Float64(y * Float64(y * y))));
	else
		tmp = Float64(Float64(Float64(x * x) - Float64(y * y)) * Float64(Float64(y * y) + Float64(x * x)));
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	tmp = 0.0;
	if (y <= -1.35e+154)
		tmp = 0.0 - (y * (y * (y * y)));
	else
		tmp = ((x * x) - (y * y)) * ((y * y) + (x * x));
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := If[LessEqual[y, -1.35e+154], N[(0.0 - N[(y * N[(y * N[(y * y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], N[(N[(N[(x * x), $MachinePrecision] - N[(y * y), $MachinePrecision]), $MachinePrecision] * N[(N[(y * y), $MachinePrecision] + N[(x * x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if y < -1.35000000000000003e154

   1. Initial program 57.1%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

      \[\leadsto \color{blue}{-1 \cdot {y}^{4}} \]
   4. Step-by-step derivation

      1. mul-1-neg N/A

         \[\leadsto \mathsf{neg}\left({y}^{4}\right) \]

      2. neg-sub0 N/A

         \[\leadsto 0 - \color{blue}{{y}^{4}} \]

      3. --lowering--.f64 N/A

         \[\leadsto \mathsf{\_.f64}\left(0, \color{blue}{\left({y}^{4}\right)}\right) \]

      4. pow-lowering-pow.f64 96.4%

         \[\leadsto \mathsf{\_.f64}\left(0, \mathsf{pow.f64}\left(y, \color{blue}{4}\right)\right) \]

   5. Simplified 96.4%

      \[\leadsto \color{blue}{0 - {y}^{4}} \]
   6. Step-by-step derivation

      1. sub0-neg N/A

         \[\leadsto \mathsf{neg}\left({y}^{4}\right) \]

      2. neg-lowering-neg.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{4}\right)\right) \]

      3. metadata-eval N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{\left(3 + 1\right)}\right)\right) \]

      4. pow-plus N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{3} \cdot y\right)\right) \]

      5. cube-unmult N/A

         \[\leadsto \mathsf{neg.f64}\left(\left(\left(y \cdot \left(y \cdot y\right)\right) \cdot y\right)\right) \]

      6. *-commutative N/A

         \[\leadsto \mathsf{neg.f64}\left(\left(y \cdot \left(y \cdot \left(y \cdot y\right)\right)\right)\right) \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \left(y \cdot \left(y \cdot y\right)\right)\right)\right) \]

      8. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, \left(y \cdot y\right)\right)\right)\right) \]

      9. *-lowering-*.f64 96.4%

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, y\right)\right)\right)\right) \]

   7. Applied egg-rr 96.4%

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

   if -1.35000000000000003e154 < y

   1. Initial program 91.2%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {\color{blue}{y}}^{4} \]

      2. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)} \cdot \color{blue}{{y}^{\left(\frac{4}{2}\right)}} \]

      3. difference-of-squares N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right)} \]

      4. *-commutative N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)} \]

      5. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)}\right) \]

      6. --lowering--.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{\left(\frac{4}{2}\right)}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left(\color{blue}{{x}^{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      7. metadata-eval N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{2}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      8. unpow2 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      9. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      10. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{2}\right)\right), \left({x}^{\left(\frac{4}{\color{blue}{2}}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      11. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      12. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      13. +-commutative N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({y}^{\left(\frac{4}{2}\right)} + \color{blue}{{x}^{\left(\frac{4}{2}\right)}}\right)\right) \]

      14. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)}\right)}\right)\right) \]

      15. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{2}\right), \left({x}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      16. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left(y \cdot y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      17. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      18. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({x}^{2}\right)\right)\right) \]

      19. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left(x \cdot \color{blue}{x}\right)\right)\right) \]

      20. *-lowering-*.f64 98.1%

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

   4. Applied egg-rr 98.1%

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

4. Final simplification 97.9%

   \[\leadsto \begin{array}{l} \mathbf{if}\;y \leq -1.35 \cdot 10^{+154}:\\ \;\;\;\;0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \mathbf{else}:\\ \;\;\;\;\left(x \cdot x - y \cdot y\right) \cdot \left(y \cdot y + x \cdot x\right)\\ \end{array} \]
5. Add Preprocessing

Alternative 6: 80.4% accurate, 10.8× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := 0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \mathbf{if}\;y \leq -3.4 \cdot 10^{-65}:\\ \;\;\;\;t\_0\\ \mathbf{elif}\;y \leq 2.4 \cdot 10^{-62}:\\ \;\;\;\;x \cdot \left(x \cdot \left(x \cdot x\right)\right)\\ \mathbf{else}:\\ \;\;\;\;t\_0\\ \end{array} \end{array} \]

FPCore

(FPCore (x y)
 :precision binary64
 (let* ((t_0 (- 0.0 (* y (* y (* y y))))))
   (if (<= y -3.4e-65) t_0 (if (<= y 2.4e-62) (* x (* x (* x x))) t_0))))

C

double code(double x, double y) {
	double t_0 = 0.0 - (y * (y * (y * y)));
	double tmp;
	if (y <= -3.4e-65) {
		tmp = t_0;
	} else if (y <= 2.4e-62) {
		tmp = x * (x * (x * x));
	} 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 = 0.0d0 - (y * (y * (y * y)))
    if (y <= (-3.4d-65)) then
        tmp = t_0
    else if (y <= 2.4d-62) then
        tmp = x * (x * (x * x))
    else
        tmp = t_0
    end if
    code = tmp
end function

Java

public static double code(double x, double y) {
	double t_0 = 0.0 - (y * (y * (y * y)));
	double tmp;
	if (y <= -3.4e-65) {
		tmp = t_0;
	} else if (y <= 2.4e-62) {
		tmp = x * (x * (x * x));
	} else {
		tmp = t_0;
	}
	return tmp;
}

Python

def code(x, y):
	t_0 = 0.0 - (y * (y * (y * y)))
	tmp = 0
	if y <= -3.4e-65:
		tmp = t_0
	elif y <= 2.4e-62:
		tmp = x * (x * (x * x))
	else:
		tmp = t_0
	return tmp

Julia

function code(x, y)
	t_0 = Float64(0.0 - Float64(y * Float64(y * Float64(y * y))))
	tmp = 0.0
	if (y <= -3.4e-65)
		tmp = t_0;
	elseif (y <= 2.4e-62)
		tmp = Float64(x * Float64(x * Float64(x * x)));
	else
		tmp = t_0;
	end
	return tmp
end

MATLAB

function tmp_2 = code(x, y)
	t_0 = 0.0 - (y * (y * (y * y)));
	tmp = 0.0;
	if (y <= -3.4e-65)
		tmp = t_0;
	elseif (y <= 2.4e-62)
		tmp = x * (x * (x * x));
	else
		tmp = t_0;
	end
	tmp_2 = tmp;
end

Wolfram

code[x_, y_] := Block[{t$95$0 = N[(0.0 - N[(y * N[(y * N[(y * y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]}, If[LessEqual[y, -3.4e-65], t$95$0, If[LessEqual[y, 2.4e-62], N[(x * N[(x * N[(x * x), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], t$95$0]]]

Derivation

1. Split input into 2 regimes

2. if y < -3.39999999999999987e-65 or 2.39999999999999984e-62 < y

   1. Initial program 75.9%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing

   3. Taylor expanded in x around 0

      \[\leadsto \color{blue}{-1 \cdot {y}^{4}} \]
   4. Step-by-step derivation

      1. mul-1-neg N/A

         \[\leadsto \mathsf{neg}\left({y}^{4}\right) \]

      2. neg-sub0 N/A

         \[\leadsto 0 - \color{blue}{{y}^{4}} \]

      3. --lowering--.f64 N/A

         \[\leadsto \mathsf{\_.f64}\left(0, \color{blue}{\left({y}^{4}\right)}\right) \]

      4. pow-lowering-pow.f64 80.5%

         \[\leadsto \mathsf{\_.f64}\left(0, \mathsf{pow.f64}\left(y, \color{blue}{4}\right)\right) \]

   5. Simplified 80.5%

      \[\leadsto \color{blue}{0 - {y}^{4}} \]
   6. Step-by-step derivation

      1. sub0-neg N/A

         \[\leadsto \mathsf{neg}\left({y}^{4}\right) \]

      2. neg-lowering-neg.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{4}\right)\right) \]

      3. metadata-eval N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{\left(3 + 1\right)}\right)\right) \]

      4. pow-plus N/A

         \[\leadsto \mathsf{neg.f64}\left(\left({y}^{3} \cdot y\right)\right) \]

      5. cube-unmult N/A

         \[\leadsto \mathsf{neg.f64}\left(\left(\left(y \cdot \left(y \cdot y\right)\right) \cdot y\right)\right) \]

      6. *-commutative N/A

         \[\leadsto \mathsf{neg.f64}\left(\left(y \cdot \left(y \cdot \left(y \cdot y\right)\right)\right)\right) \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \left(y \cdot \left(y \cdot y\right)\right)\right)\right) \]

      8. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, \left(y \cdot y\right)\right)\right)\right) \]

      9. *-lowering-*.f64 80.4%

         \[\leadsto \mathsf{neg.f64}\left(\mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, \mathsf{*.f64}\left(y, y\right)\right)\right)\right) \]

   7. Applied egg-rr 80.4%

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

   if -3.39999999999999987e-65 < y < 2.39999999999999984e-62

   1. Initial program 100.0%

      \[{x}^{4} - {y}^{4} \]
   2. Add Preprocessing
   3. Step-by-step derivation

      1. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {\color{blue}{y}}^{4} \]

      2. sqr-pow N/A

         \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)} \cdot \color{blue}{{y}^{\left(\frac{4}{2}\right)}} \]

      3. difference-of-squares N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right)} \]

      4. *-commutative N/A

         \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)} \]

      5. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)}\right) \]

      6. --lowering--.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{\left(\frac{4}{2}\right)}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left(\color{blue}{{x}^{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      7. metadata-eval N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{2}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      8. unpow2 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      9. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      10. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{2}\right)\right), \left({x}^{\left(\frac{4}{\color{blue}{2}}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      11. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      12. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

      13. +-commutative N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({y}^{\left(\frac{4}{2}\right)} + \color{blue}{{x}^{\left(\frac{4}{2}\right)}}\right)\right) \]

      14. +-lowering-+.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)}\right)}\right)\right) \]

      15. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{2}\right), \left({x}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      16. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left(y \cdot y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      17. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

      18. metadata-eval N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({x}^{2}\right)\right)\right) \]

      19. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left(x \cdot \color{blue}{x}\right)\right)\right) \]

      20. *-lowering-*.f64 99.8%

          \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

   4. Applied egg-rr 99.8%

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

   5. Taylor expanded in x around inf

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

      1. metadata-eval N/A

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

      2. pow-sqr N/A

         \[\leadsto {x}^{2} \cdot \color{blue}{{x}^{2}} \]

      3. unpow2 N/A

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

      4. associate-*r* N/A

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

      5. unpow2 N/A

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

      6. cube-mult N/A

         \[\leadsto x \cdot {x}^{\color{blue}{3}} \]

      7. *-lowering-*.f64 N/A

         \[\leadsto \mathsf{*.f64}\left(x, \color{blue}{\left({x}^{3}\right)}\right) \]

      8. cube-mult N/A

         \[\leadsto \mathsf{*.f64}\left(x, \left(x \cdot \color{blue}{\left(x \cdot x\right)}\right)\right) \]

      9. unpow2 N/A

         \[\leadsto \mathsf{*.f64}\left(x, \left(x \cdot {x}^{\color{blue}{2}}\right)\right) \]

      10. *-lowering-*.f64 N/A

          \[\leadsto \mathsf{*.f64}\left(x, \mathsf{*.f64}\left(x, \color{blue}{\left({x}^{2}\right)}\right)\right) \]

      11. unpow2 N/A

          \[\leadsto \mathsf{*.f64}\left(x, \mathsf{*.f64}\left(x, \left(x \cdot \color{blue}{x}\right)\right)\right) \]

      12. *-lowering-*.f64 99.5%

          \[\leadsto \mathsf{*.f64}\left(x, \mathsf{*.f64}\left(x, \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

   7. Simplified 99.5%

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

4. Final simplification 89.6%

   \[\leadsto \begin{array}{l} \mathbf{if}\;y \leq -3.4 \cdot 10^{-65}:\\ \;\;\;\;0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \mathbf{elif}\;y \leq 2.4 \cdot 10^{-62}:\\ \;\;\;\;x \cdot \left(x \cdot \left(x \cdot x\right)\right)\\ \mathbf{else}:\\ \;\;\;\;0 - y \cdot \left(y \cdot \left(y \cdot y\right)\right)\\ \end{array} \]
5. Add Preprocessing

Alternative 7: 57.2% accurate, 29.3× speedup

Math

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

FPCore

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

C

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

Fortran

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

Java

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

Python

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

Julia

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

MATLAB

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

Wolfram

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

Derivation

1. Initial program 87.5%

   \[{x}^{4} - {y}^{4} \]
2. Add Preprocessing
3. Step-by-step derivation

   1. sqr-pow N/A

      \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {\color{blue}{y}}^{4} \]

   2. sqr-pow N/A

      \[\leadsto {x}^{\left(\frac{4}{2}\right)} \cdot {x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)} \cdot \color{blue}{{y}^{\left(\frac{4}{2}\right)}} \]

   3. difference-of-squares N/A

      \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right)} \]

   4. *-commutative N/A

      \[\leadsto \left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right) \cdot \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)} \]

   5. *-lowering-*.f64 N/A

      \[\leadsto \mathsf{*.f64}\left(\left({x}^{\left(\frac{4}{2}\right)} - {y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)}\right) \]

   6. --lowering--.f64 N/A

      \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{\left(\frac{4}{2}\right)}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left(\color{blue}{{x}^{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

   7. metadata-eval N/A

      \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left({x}^{2}\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({x}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

   8. unpow2 N/A

      \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\left(x \cdot x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

   9. *-lowering-*.f64 N/A

      \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{\left(\frac{4}{2}\right)}\right)\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

   10. metadata-eval N/A

       \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left({y}^{2}\right)\right), \left({x}^{\left(\frac{4}{\color{blue}{2}}\right)} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

   11. unpow2 N/A

       \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \left(y \cdot y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

   12. *-lowering-*.f64 N/A

       \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({x}^{\color{blue}{\left(\frac{4}{2}\right)}} + {y}^{\left(\frac{4}{2}\right)}\right)\right) \]

   13. +-commutative N/A

       \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \left({y}^{\left(\frac{4}{2}\right)} + \color{blue}{{x}^{\left(\frac{4}{2}\right)}}\right)\right) \]

   14. +-lowering-+.f64 N/A

       \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{\left(\frac{4}{2}\right)}\right), \color{blue}{\left({x}^{\left(\frac{4}{2}\right)}\right)}\right)\right) \]

   15. metadata-eval N/A

       \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left({y}^{2}\right), \left({x}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

   16. unpow2 N/A

       \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\left(y \cdot y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

   17. *-lowering-*.f64 N/A

       \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({\color{blue}{x}}^{\left(\frac{4}{2}\right)}\right)\right)\right) \]

   18. metadata-eval N/A

       \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left({x}^{2}\right)\right)\right) \]

   19. unpow2 N/A

       \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \left(x \cdot \color{blue}{x}\right)\right)\right) \]

   20. *-lowering-*.f64 95.2%

       \[\leadsto \mathsf{*.f64}\left(\mathsf{\_.f64}\left(\mathsf{*.f64}\left(x, x\right), \mathsf{*.f64}\left(y, y\right)\right), \mathsf{+.f64}\left(\mathsf{*.f64}\left(y, y\right), \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

4. Applied egg-rr 95.2%

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

5. Taylor expanded in x around inf

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

   1. metadata-eval N/A

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

   2. pow-sqr N/A

      \[\leadsto {x}^{2} \cdot \color{blue}{{x}^{2}} \]

   3. unpow2 N/A

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

   4. associate-*r* N/A

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

   5. unpow2 N/A

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

   6. cube-mult N/A

      \[\leadsto x \cdot {x}^{\color{blue}{3}} \]

   7. *-lowering-*.f64 N/A

      \[\leadsto \mathsf{*.f64}\left(x, \color{blue}{\left({x}^{3}\right)}\right) \]

   8. cube-mult N/A

      \[\leadsto \mathsf{*.f64}\left(x, \left(x \cdot \color{blue}{\left(x \cdot x\right)}\right)\right) \]

   9. unpow2 N/A

      \[\leadsto \mathsf{*.f64}\left(x, \left(x \cdot {x}^{\color{blue}{2}}\right)\right) \]

   10. *-lowering-*.f64 N/A

       \[\leadsto \mathsf{*.f64}\left(x, \mathsf{*.f64}\left(x, \color{blue}{\left({x}^{2}\right)}\right)\right) \]

   11. unpow2 N/A

       \[\leadsto \mathsf{*.f64}\left(x, \mathsf{*.f64}\left(x, \left(x \cdot \color{blue}{x}\right)\right)\right) \]

   12. *-lowering-*.f64 58.6%

       \[\leadsto \mathsf{*.f64}\left(x, \mathsf{*.f64}\left(x, \mathsf{*.f64}\left(x, \color{blue}{x}\right)\right)\right) \]

7. Simplified 58.6%

   \[\leadsto \color{blue}{x \cdot \left(x \cdot \left(x \cdot x\right)\right)} \]
8. Add Preprocessing

Reproduce

herbie shell --seed 2024191 
(FPCore (x y)
  :name "Radioactive exchange between two surfaces"
  :precision binary64
  (- (pow x 4.0) (pow y 4.0)))