2-ancestry mixing, positive discriminant

Percentage Accurate: 44.4% → 95.7%

Time: 10.0s

Alternatives: 6

Speedup: 2.6×

Specification

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{1}{2 \cdot a}\\ t_1 := \sqrt{g \cdot g - h \cdot h}\\ \sqrt[3]{t\_0 \cdot \left(\left(-g\right) + t\_1\right)} + \sqrt[3]{t\_0 \cdot \left(\left(-g\right) - t\_1\right)} \end{array} \end{array} \]

FPCore

(FPCore (g h a)
 :precision binary64
 (let* ((t_0 (/ 1.0 (* 2.0 a))) (t_1 (sqrt (- (* g g) (* h h)))))
   (+ (cbrt (* t_0 (+ (- g) t_1))) (cbrt (* t_0 (- (- g) t_1))))))

C

double code(double g, double h, double a) {
	double t_0 = 1.0 / (2.0 * a);
	double t_1 = sqrt(((g * g) - (h * h)));
	return cbrt((t_0 * (-g + t_1))) + cbrt((t_0 * (-g - t_1)));
}

Java

public static double code(double g, double h, double a) {
	double t_0 = 1.0 / (2.0 * a);
	double t_1 = Math.sqrt(((g * g) - (h * h)));
	return Math.cbrt((t_0 * (-g + t_1))) + Math.cbrt((t_0 * (-g - t_1)));
}

Julia

function code(g, h, a)
	t_0 = Float64(1.0 / Float64(2.0 * a))
	t_1 = sqrt(Float64(Float64(g * g) - Float64(h * h)))
	return Float64(cbrt(Float64(t_0 * Float64(Float64(-g) + t_1))) + cbrt(Float64(t_0 * Float64(Float64(-g) - t_1))))
end

Wolfram

code[g_, h_, a_] := Block[{t$95$0 = N[(1.0 / N[(2.0 * a), $MachinePrecision]), $MachinePrecision]}, Block[{t$95$1 = N[Sqrt[N[(N[(g * g), $MachinePrecision] - N[(h * h), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]}, N[(N[Power[N[(t$95$0 * N[((-g) + t$95$1), $MachinePrecision]), $MachinePrecision], 1/3], $MachinePrecision] + N[Power[N[(t$95$0 * N[((-g) - t$95$1), $MachinePrecision]), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision]]]

Initial Program: 44.4% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} t_0 := \frac{1}{2 \cdot a}\\ t_1 := \sqrt{g \cdot g - h \cdot h}\\ \sqrt[3]{t\_0 \cdot \left(\left(-g\right) + t\_1\right)} + \sqrt[3]{t\_0 \cdot \left(\left(-g\right) - t\_1\right)} \end{array} \end{array} \]

FPCore

(FPCore (g h a)
 :precision binary64
 (let* ((t_0 (/ 1.0 (* 2.0 a))) (t_1 (sqrt (- (* g g) (* h h)))))
   (+ (cbrt (* t_0 (+ (- g) t_1))) (cbrt (* t_0 (- (- g) t_1))))))

C

double code(double g, double h, double a) {
	double t_0 = 1.0 / (2.0 * a);
	double t_1 = sqrt(((g * g) - (h * h)));
	return cbrt((t_0 * (-g + t_1))) + cbrt((t_0 * (-g - t_1)));
}

Java

public static double code(double g, double h, double a) {
	double t_0 = 1.0 / (2.0 * a);
	double t_1 = Math.sqrt(((g * g) - (h * h)));
	return Math.cbrt((t_0 * (-g + t_1))) + Math.cbrt((t_0 * (-g - t_1)));
}

Julia

function code(g, h, a)
	t_0 = Float64(1.0 / Float64(2.0 * a))
	t_1 = sqrt(Float64(Float64(g * g) - Float64(h * h)))
	return Float64(cbrt(Float64(t_0 * Float64(Float64(-g) + t_1))) + cbrt(Float64(t_0 * Float64(Float64(-g) - t_1))))
end

Wolfram

code[g_, h_, a_] := Block[{t$95$0 = N[(1.0 / N[(2.0 * a), $MachinePrecision]), $MachinePrecision]}, Block[{t$95$1 = N[Sqrt[N[(N[(g * g), $MachinePrecision] - N[(h * h), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]}, N[(N[Power[N[(t$95$0 * N[((-g) + t$95$1), $MachinePrecision]), $MachinePrecision], 1/3], $MachinePrecision] + N[Power[N[(t$95$0 * N[((-g) - t$95$1), $MachinePrecision]), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision]]]

Alternative 1: 95.7% accurate, 1.4× speedup

Math

\[\begin{array}{l} \\ \sqrt[3]{\frac{-1}{a}} \cdot \sqrt[3]{g} \end{array} \]

FPCore

(FPCore (g h a) :precision binary64 (* (cbrt (/ -1.0 a)) (cbrt g)))

C

double code(double g, double h, double a) {
	return cbrt((-1.0 / a)) * cbrt(g);
}

Java

public static double code(double g, double h, double a) {
	return Math.cbrt((-1.0 / a)) * Math.cbrt(g);
}

Julia

function code(g, h, a)
	return Float64(cbrt(Float64(-1.0 / a)) * cbrt(g))
end

Wolfram

code[g_, h_, a_] := N[(N[Power[N[(-1.0 / a), $MachinePrecision], 1/3], $MachinePrecision] * N[Power[g, 1/3], $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 39.1%

   \[\sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) + \sqrt{g \cdot g - h \cdot h}\right)} + \sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) - \sqrt{g \cdot g - h \cdot h}\right)} \]
2. Add Preprocessing

3. Taylor expanded in g around inf

   \[\leadsto \color{blue}{\sqrt[3]{\frac{g}{a}} \cdot \left(\sqrt[3]{\frac{-1}{2}} \cdot \sqrt[3]{2}\right)} \]
4. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\left(\sqrt[3]{2} \cdot \sqrt[3]{\frac{-1}{2}}\right)} \]

   2. associate-*r* N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

   3. lower-*.f64 N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

   4. lower-*.f64 N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right)} \cdot \sqrt[3]{\frac{-1}{2}} \]

   5. lower-cbrt.f64 N/A

      \[\leadsto \left(\color{blue}{\sqrt[3]{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   6. lower-/.f64 N/A

      \[\leadsto \left(\sqrt[3]{\color{blue}{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   7. lower-cbrt.f64 N/A

      \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\sqrt[3]{2}}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   8. lower-cbrt.f64 71.5

      \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \color{blue}{\sqrt[3]{-0.5}} \]

5. Applied rewrites 71.5%

   \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{-0.5}} \]
6. Step-by-step derivation

7. Applied rewrites 94.6%

   \[\leadsto \frac{\sqrt[3]{g} \cdot \sqrt[3]{-1}}{\color{blue}{\sqrt[3]{a}}} \]
8. Step-by-step derivation

9. Applied rewrites 94.7%

   \[\leadsto \sqrt[3]{\frac{-1}{a}} \cdot \color{blue}{\sqrt[3]{g}} \]
10. Add Preprocessing

Alternative 2: 81.8% accurate, 0.9× speedup

Math

\[\begin{array}{l} \\ \begin{array}{l} \mathbf{if}\;{\left(2 \cdot a\right)}^{-1} \leq -2 \cdot 10^{-271}:\\ \;\;\;\;{\left(-a\right)}^{-0.3333333333333333} \cdot \sqrt[3]{g}\\ \mathbf{else}:\\ \;\;\;\;\frac{-1}{\sqrt[3]{\frac{a}{g}}}\\ \end{array} \end{array} \]

FPCore

(FPCore (g h a)
 :precision binary64
 (if (<= (pow (* 2.0 a) -1.0) -2e-271)
   (* (pow (- a) -0.3333333333333333) (cbrt g))
   (/ -1.0 (cbrt (/ a g)))))

C

double code(double g, double h, double a) {
	double tmp;
	if (pow((2.0 * a), -1.0) <= -2e-271) {
		tmp = pow(-a, -0.3333333333333333) * cbrt(g);
	} else {
		tmp = -1.0 / cbrt((a / g));
	}
	return tmp;
}

Java

public static double code(double g, double h, double a) {
	double tmp;
	if (Math.pow((2.0 * a), -1.0) <= -2e-271) {
		tmp = Math.pow(-a, -0.3333333333333333) * Math.cbrt(g);
	} else {
		tmp = -1.0 / Math.cbrt((a / g));
	}
	return tmp;
}

Julia

function code(g, h, a)
	tmp = 0.0
	if ((Float64(2.0 * a) ^ -1.0) <= -2e-271)
		tmp = Float64((Float64(-a) ^ -0.3333333333333333) * cbrt(g));
	else
		tmp = Float64(-1.0 / cbrt(Float64(a / g)));
	end
	return tmp
end

Wolfram

code[g_, h_, a_] := If[LessEqual[N[Power[N[(2.0 * a), $MachinePrecision], -1.0], $MachinePrecision], -2e-271], N[(N[Power[(-a), -0.3333333333333333], $MachinePrecision] * N[Power[g, 1/3], $MachinePrecision]), $MachinePrecision], N[(-1.0 / N[Power[N[(a / g), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision]]

Derivation

1. Split input into 2 regimes

2. if (/.f64 #s(literal 1 binary64) (*.f64 #s(literal 2 binary64) a)) < -1.99999999999999993e-271

   1. Initial program 40.4%

      \[\sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) + \sqrt{g \cdot g - h \cdot h}\right)} + \sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) - \sqrt{g \cdot g - h \cdot h}\right)} \]
   2. Add Preprocessing

   3. Taylor expanded in g around inf

      \[\leadsto \color{blue}{\sqrt[3]{\frac{g}{a}} \cdot \left(\sqrt[3]{\frac{-1}{2}} \cdot \sqrt[3]{2}\right)} \]
   4. Step-by-step derivation

      1. *-commutative N/A

         \[\leadsto \sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\left(\sqrt[3]{2} \cdot \sqrt[3]{\frac{-1}{2}}\right)} \]

      2. associate-*r* N/A

         \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

      3. lower-*.f64 N/A

         \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

      4. lower-*.f64 N/A

         \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right)} \cdot \sqrt[3]{\frac{-1}{2}} \]

      5. lower-cbrt.f64 N/A

         \[\leadsto \left(\color{blue}{\sqrt[3]{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

      6. lower-/.f64 N/A

         \[\leadsto \left(\sqrt[3]{\color{blue}{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

      7. lower-cbrt.f64 N/A

         \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\sqrt[3]{2}}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

      8. lower-cbrt.f64 71.5

         \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \color{blue}{\sqrt[3]{-0.5}} \]

   5. Applied rewrites 71.5%

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{-0.5}} \]
   6. Step-by-step derivation

   7. Applied rewrites 93.7%

      \[\leadsto \frac{\sqrt[3]{g} \cdot \sqrt[3]{-1}}{\color{blue}{\sqrt[3]{a}}} \]
   8. Step-by-step derivation

   9. Applied rewrites 93.6%

      \[\leadsto \sqrt[3]{\frac{-1}{a}} \cdot \color{blue}{\sqrt[3]{g}} \]
   10. Step-by-step derivation

   11. Applied rewrites 87.8%

       \[\leadsto {\left(-a\right)}^{-0.3333333333333333} \cdot \sqrt[3]{\color{blue}{g}} \]

   if -1.99999999999999993e-271 < (/.f64 #s(literal 1 binary64) (*.f64 #s(literal 2 binary64) a))

   1. Initial program 38.0%

      \[\sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) + \sqrt{g \cdot g - h \cdot h}\right)} + \sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) - \sqrt{g \cdot g - h \cdot h}\right)} \]
   2. Add Preprocessing

   3. Taylor expanded in g around inf

      \[\leadsto \color{blue}{\sqrt[3]{\frac{g}{a}} \cdot \left(\sqrt[3]{\frac{-1}{2}} \cdot \sqrt[3]{2}\right)} \]
   4. Step-by-step derivation

      1. *-commutative N/A

         \[\leadsto \sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\left(\sqrt[3]{2} \cdot \sqrt[3]{\frac{-1}{2}}\right)} \]

      2. associate-*r* N/A

         \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

      3. lower-*.f64 N/A

         \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

      4. lower-*.f64 N/A

         \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right)} \cdot \sqrt[3]{\frac{-1}{2}} \]

      5. lower-cbrt.f64 N/A

         \[\leadsto \left(\color{blue}{\sqrt[3]{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

      6. lower-/.f64 N/A

         \[\leadsto \left(\sqrt[3]{\color{blue}{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

      7. lower-cbrt.f64 N/A

         \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\sqrt[3]{2}}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

      8. lower-cbrt.f64 71.5

         \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \color{blue}{\sqrt[3]{-0.5}} \]

   5. Applied rewrites 71.5%

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{-0.5}} \]
   6. Step-by-step derivation

   7. Applied rewrites 95.4%

      \[\leadsto \frac{\sqrt[3]{g} \cdot \sqrt[3]{-1}}{\color{blue}{\sqrt[3]{a}}} \]
   8. Step-by-step derivation

   9. Applied rewrites 95.5%

      \[\leadsto \sqrt[3]{\frac{-1}{a}} \cdot \color{blue}{\sqrt[3]{g}} \]
   10. Step-by-step derivation

   11. Applied rewrites 72.5%

       \[\leadsto \frac{-1}{\color{blue}{\sqrt[3]{\frac{a}{g}}}} \]
3. Recombined 2 regimes into one program.

4. Final simplification 79.4%

   \[\leadsto \begin{array}{l} \mathbf{if}\;{\left(2 \cdot a\right)}^{-1} \leq -2 \cdot 10^{-271}:\\ \;\;\;\;{\left(-a\right)}^{-0.3333333333333333} \cdot \sqrt[3]{g}\\ \mathbf{else}:\\ \;\;\;\;\frac{-1}{\sqrt[3]{\frac{a}{g}}}\\ \end{array} \]
5. Add Preprocessing

Alternative 3: 95.8% accurate, 1.4× speedup

Math

\[\begin{array}{l} \\ \frac{\sqrt[3]{-g}}{\sqrt[3]{a}} \end{array} \]

FPCore

(FPCore (g h a) :precision binary64 (/ (cbrt (- g)) (cbrt a)))

C

double code(double g, double h, double a) {
	return cbrt(-g) / cbrt(a);
}

Java

public static double code(double g, double h, double a) {
	return Math.cbrt(-g) / Math.cbrt(a);
}

Julia

function code(g, h, a)
	return Float64(cbrt(Float64(-g)) / cbrt(a))
end

Wolfram

code[g_, h_, a_] := N[(N[Power[(-g), 1/3], $MachinePrecision] / N[Power[a, 1/3], $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 39.1%

   \[\sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) + \sqrt{g \cdot g - h \cdot h}\right)} + \sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) - \sqrt{g \cdot g - h \cdot h}\right)} \]
2. Add Preprocessing

3. Taylor expanded in g around inf

   \[\leadsto \color{blue}{\sqrt[3]{\frac{g}{a}} \cdot \left(\sqrt[3]{\frac{-1}{2}} \cdot \sqrt[3]{2}\right)} \]
4. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\left(\sqrt[3]{2} \cdot \sqrt[3]{\frac{-1}{2}}\right)} \]

   2. associate-*r* N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

   3. lower-*.f64 N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

   4. lower-*.f64 N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right)} \cdot \sqrt[3]{\frac{-1}{2}} \]

   5. lower-cbrt.f64 N/A

      \[\leadsto \left(\color{blue}{\sqrt[3]{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   6. lower-/.f64 N/A

      \[\leadsto \left(\sqrt[3]{\color{blue}{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   7. lower-cbrt.f64 N/A

      \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\sqrt[3]{2}}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   8. lower-cbrt.f64 71.5

      \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \color{blue}{\sqrt[3]{-0.5}} \]

5. Applied rewrites 71.5%

   \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{-0.5}} \]
6. Step-by-step derivation

7. Applied rewrites 94.6%

   \[\leadsto \frac{\sqrt[3]{g} \cdot \sqrt[3]{-1}}{\color{blue}{\sqrt[3]{a}}} \]
8. Step-by-step derivation

9. Applied rewrites 94.6%

   \[\leadsto \frac{\sqrt[3]{-g}}{\color{blue}{\sqrt[3]{a}}} \]
10. Add Preprocessing

Alternative 4: 74.7% accurate, 2.5× speedup

Math

\[\begin{array}{l} \\ \frac{-1}{\sqrt[3]{\frac{a}{g}}} \end{array} \]

FPCore

(FPCore (g h a) :precision binary64 (/ -1.0 (cbrt (/ a g))))

C

double code(double g, double h, double a) {
	return -1.0 / cbrt((a / g));
}

Java

public static double code(double g, double h, double a) {
	return -1.0 / Math.cbrt((a / g));
}

Julia

function code(g, h, a)
	return Float64(-1.0 / cbrt(Float64(a / g)))
end

Wolfram

code[g_, h_, a_] := N[(-1.0 / N[Power[N[(a / g), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision]

Derivation

1. Initial program 39.1%

   \[\sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) + \sqrt{g \cdot g - h \cdot h}\right)} + \sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) - \sqrt{g \cdot g - h \cdot h}\right)} \]
2. Add Preprocessing

3. Taylor expanded in g around inf

   \[\leadsto \color{blue}{\sqrt[3]{\frac{g}{a}} \cdot \left(\sqrt[3]{\frac{-1}{2}} \cdot \sqrt[3]{2}\right)} \]
4. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\left(\sqrt[3]{2} \cdot \sqrt[3]{\frac{-1}{2}}\right)} \]

   2. associate-*r* N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

   3. lower-*.f64 N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

   4. lower-*.f64 N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right)} \cdot \sqrt[3]{\frac{-1}{2}} \]

   5. lower-cbrt.f64 N/A

      \[\leadsto \left(\color{blue}{\sqrt[3]{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   6. lower-/.f64 N/A

      \[\leadsto \left(\sqrt[3]{\color{blue}{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   7. lower-cbrt.f64 N/A

      \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\sqrt[3]{2}}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   8. lower-cbrt.f64 71.5

      \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \color{blue}{\sqrt[3]{-0.5}} \]

5. Applied rewrites 71.5%

   \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{-0.5}} \]
6. Step-by-step derivation

7. Applied rewrites 94.6%

   \[\leadsto \frac{\sqrt[3]{g} \cdot \sqrt[3]{-1}}{\color{blue}{\sqrt[3]{a}}} \]
8. Step-by-step derivation

9. Applied rewrites 94.7%

   \[\leadsto \sqrt[3]{\frac{-1}{a}} \cdot \color{blue}{\sqrt[3]{g}} \]
10. Step-by-step derivation

11. Applied rewrites 72.9%

    \[\leadsto \frac{-1}{\color{blue}{\sqrt[3]{\frac{a}{g}}}} \]
12. Add Preprocessing

Alternative 5: 74.1% accurate, 2.6× speedup

Math

\[\begin{array}{l} \\ \sqrt[3]{\frac{-1}{a} \cdot g} \end{array} \]

FPCore

(FPCore (g h a) :precision binary64 (cbrt (* (/ -1.0 a) g)))

C

double code(double g, double h, double a) {
	return cbrt(((-1.0 / a) * g));
}

Java

public static double code(double g, double h, double a) {
	return Math.cbrt(((-1.0 / a) * g));
}

Julia

function code(g, h, a)
	return cbrt(Float64(Float64(-1.0 / a) * g))
end

Wolfram

code[g_, h_, a_] := N[Power[N[(N[(-1.0 / a), $MachinePrecision] * g), $MachinePrecision], 1/3], $MachinePrecision]

Derivation

1. Initial program 39.1%

   \[\sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) + \sqrt{g \cdot g - h \cdot h}\right)} + \sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) - \sqrt{g \cdot g - h \cdot h}\right)} \]
2. Add Preprocessing

3. Taylor expanded in g around inf

   \[\leadsto \color{blue}{\sqrt[3]{\frac{g}{a}} \cdot \left(\sqrt[3]{\frac{-1}{2}} \cdot \sqrt[3]{2}\right)} \]
4. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\left(\sqrt[3]{2} \cdot \sqrt[3]{\frac{-1}{2}}\right)} \]

   2. associate-*r* N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

   3. lower-*.f64 N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

   4. lower-*.f64 N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right)} \cdot \sqrt[3]{\frac{-1}{2}} \]

   5. lower-cbrt.f64 N/A

      \[\leadsto \left(\color{blue}{\sqrt[3]{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   6. lower-/.f64 N/A

      \[\leadsto \left(\sqrt[3]{\color{blue}{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   7. lower-cbrt.f64 N/A

      \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\sqrt[3]{2}}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   8. lower-cbrt.f64 71.5

      \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \color{blue}{\sqrt[3]{-0.5}} \]

5. Applied rewrites 71.5%

   \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{-0.5}} \]
6. Step-by-step derivation

7. Applied rewrites 94.6%

   \[\leadsto \frac{\sqrt[3]{g} \cdot \sqrt[3]{-1}}{\color{blue}{\sqrt[3]{a}}} \]
8. Step-by-step derivation

9. Applied rewrites 72.4%

   \[\leadsto \color{blue}{\sqrt[3]{\frac{-g}{a}}} \]
10. Step-by-step derivation

11. Applied rewrites 72.4%

    \[\leadsto \sqrt[3]{\frac{-1}{a} \cdot g} \]
12. Add Preprocessing

Alternative 6: 74.1% accurate, 2.6× speedup

Math

\[\begin{array}{l} \\ \sqrt[3]{\frac{-g}{a}} \end{array} \]

FPCore

(FPCore (g h a) :precision binary64 (cbrt (/ (- g) a)))

C

double code(double g, double h, double a) {
	return cbrt((-g / a));
}

Java

public static double code(double g, double h, double a) {
	return Math.cbrt((-g / a));
}

Julia

function code(g, h, a)
	return cbrt(Float64(Float64(-g) / a))
end

Wolfram

code[g_, h_, a_] := N[Power[N[((-g) / a), $MachinePrecision], 1/3], $MachinePrecision]

Derivation

1. Initial program 39.1%

   \[\sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) + \sqrt{g \cdot g - h \cdot h}\right)} + \sqrt[3]{\frac{1}{2 \cdot a} \cdot \left(\left(-g\right) - \sqrt{g \cdot g - h \cdot h}\right)} \]
2. Add Preprocessing

3. Taylor expanded in g around inf

   \[\leadsto \color{blue}{\sqrt[3]{\frac{g}{a}} \cdot \left(\sqrt[3]{\frac{-1}{2}} \cdot \sqrt[3]{2}\right)} \]
4. Step-by-step derivation

   1. *-commutative N/A

      \[\leadsto \sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\left(\sqrt[3]{2} \cdot \sqrt[3]{\frac{-1}{2}}\right)} \]

   2. associate-*r* N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

   3. lower-*.f64 N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}}} \]

   4. lower-*.f64 N/A

      \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right)} \cdot \sqrt[3]{\frac{-1}{2}} \]

   5. lower-cbrt.f64 N/A

      \[\leadsto \left(\color{blue}{\sqrt[3]{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   6. lower-/.f64 N/A

      \[\leadsto \left(\sqrt[3]{\color{blue}{\frac{g}{a}}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   7. lower-cbrt.f64 N/A

      \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \color{blue}{\sqrt[3]{2}}\right) \cdot \sqrt[3]{\frac{-1}{2}} \]

   8. lower-cbrt.f64 71.5

      \[\leadsto \left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \color{blue}{\sqrt[3]{-0.5}} \]

5. Applied rewrites 71.5%

   \[\leadsto \color{blue}{\left(\sqrt[3]{\frac{g}{a}} \cdot \sqrt[3]{2}\right) \cdot \sqrt[3]{-0.5}} \]
6. Step-by-step derivation

7. Applied rewrites 94.6%

   \[\leadsto \frac{\sqrt[3]{g} \cdot \sqrt[3]{-1}}{\color{blue}{\sqrt[3]{a}}} \]
8. Step-by-step derivation

9. Applied rewrites 72.4%

   \[\leadsto \color{blue}{\sqrt[3]{\frac{-g}{a}}} \]
10. Add Preprocessing

Reproduce

herbie shell --seed 2024324 
(FPCore (g h a)
  :name "2-ancestry mixing, positive discriminant"
  :precision binary64
  (+ (cbrt (* (/ 1.0 (* 2.0 a)) (+ (- g) (sqrt (- (* g g) (* h h)))))) (cbrt (* (/ 1.0 (* 2.0 a)) (- (- g) (sqrt (- (* g g) (* h h))))))))