
(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))))))
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)));
}
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)));
}
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
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]]]
\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}
Sampling outcomes in binary64 precision:
Herbie found 4 alternatives:
| Alternative | Accuracy | Speedup |
|---|
(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))))))
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)));
}
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)));
}
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
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]]]
\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 (g h a) :precision binary64 (+ (cbrt (* (/ 0.5 a) (- g g))) (/ (cbrt g) (cbrt (- a)))))
double code(double g, double h, double a) {
return cbrt(((0.5 / a) * (g - g))) + (cbrt(g) / cbrt(-a));
}
public static double code(double g, double h, double a) {
return Math.cbrt(((0.5 / a) * (g - g))) + (Math.cbrt(g) / Math.cbrt(-a));
}
function code(g, h, a) return Float64(cbrt(Float64(Float64(0.5 / a) * Float64(g - g))) + Float64(cbrt(g) / cbrt(Float64(-a)))) end
code[g_, h_, a_] := N[(N[Power[N[(N[(0.5 / a), $MachinePrecision] * N[(g - g), $MachinePrecision]), $MachinePrecision], 1/3], $MachinePrecision] + N[(N[Power[g, 1/3], $MachinePrecision] / N[Power[(-a), 1/3], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\sqrt[3]{\frac{0.5}{a} \cdot \left(g - g\right)} + \frac{\sqrt[3]{g}}{\sqrt[3]{-a}}
\end{array}
Initial program 41.2%
Simplified41.2%
Taylor expanded in g around inf 23.2%
Taylor expanded in g around inf 72.2%
associate-*r/72.2%
neg-mul-172.2%
Simplified72.2%
frac-2neg72.2%
cbrt-div96.1%
remove-double-neg96.1%
Applied egg-rr96.1%
Final simplification96.1%
(FPCore (g h a) :precision binary64 (+ (cbrt (* (/ 0.5 a) (- g g))) (cbrt (* (+ g g) (/ -0.5 a)))))
double code(double g, double h, double a) {
return cbrt(((0.5 / a) * (g - g))) + cbrt(((g + g) * (-0.5 / a)));
}
public static double code(double g, double h, double a) {
return Math.cbrt(((0.5 / a) * (g - g))) + Math.cbrt(((g + g) * (-0.5 / a)));
}
function code(g, h, a) return Float64(cbrt(Float64(Float64(0.5 / a) * Float64(g - g))) + cbrt(Float64(Float64(g + g) * Float64(-0.5 / a)))) end
code[g_, h_, a_] := N[(N[Power[N[(N[(0.5 / a), $MachinePrecision] * N[(g - g), $MachinePrecision]), $MachinePrecision], 1/3], $MachinePrecision] + N[Power[N[(N[(g + g), $MachinePrecision] * N[(-0.5 / a), $MachinePrecision]), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\sqrt[3]{\frac{0.5}{a} \cdot \left(g - g\right)} + \sqrt[3]{\left(g + g\right) \cdot \frac{-0.5}{a}}
\end{array}
Initial program 41.2%
Simplified41.2%
Taylor expanded in g around inf 23.2%
Taylor expanded in g around inf 72.2%
Final simplification72.2%
(FPCore (g h a) :precision binary64 (+ (cbrt (* (/ 0.5 a) (- g g))) (cbrt (/ g (- a)))))
double code(double g, double h, double a) {
return cbrt(((0.5 / a) * (g - g))) + cbrt((g / -a));
}
public static double code(double g, double h, double a) {
return Math.cbrt(((0.5 / a) * (g - g))) + Math.cbrt((g / -a));
}
function code(g, h, a) return Float64(cbrt(Float64(Float64(0.5 / a) * Float64(g - g))) + cbrt(Float64(g / Float64(-a)))) end
code[g_, h_, a_] := N[(N[Power[N[(N[(0.5 / a), $MachinePrecision] * N[(g - g), $MachinePrecision]), $MachinePrecision], 1/3], $MachinePrecision] + N[Power[N[(g / (-a)), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\sqrt[3]{\frac{0.5}{a} \cdot \left(g - g\right)} + \sqrt[3]{\frac{g}{-a}}
\end{array}
Initial program 41.2%
Simplified41.2%
Taylor expanded in g around inf 23.2%
Taylor expanded in g around inf 72.2%
associate-*r/72.2%
neg-mul-172.2%
Simplified72.2%
Final simplification72.2%
(FPCore (g h a) :precision binary64 (cbrt (* (/ 0.5 a) (- g g))))
double code(double g, double h, double a) {
return cbrt(((0.5 / a) * (g - g)));
}
public static double code(double g, double h, double a) {
return Math.cbrt(((0.5 / a) * (g - g)));
}
function code(g, h, a) return cbrt(Float64(Float64(0.5 / a) * Float64(g - g))) end
code[g_, h_, a_] := N[Power[N[(N[(0.5 / a), $MachinePrecision] * N[(g - g), $MachinePrecision]), $MachinePrecision], 1/3], $MachinePrecision]
\begin{array}{l}
\\
\sqrt[3]{\frac{0.5}{a} \cdot \left(g - g\right)}
\end{array}
Initial program 41.2%
Simplified41.2%
Taylor expanded in g around inf 23.2%
Taylor expanded in g around inf 72.2%
pow1/334.4%
add-log-exp3.7%
*-commutative3.7%
exp-prod2.8%
add-sqr-sqrt1.4%
sqrt-unprod2.8%
frac-times2.8%
metadata-eval2.8%
metadata-eval2.8%
frac-times2.8%
sqrt-unprod1.4%
add-sqr-sqrt2.8%
add-sqr-sqrt2.1%
sqrt-prod2.8%
sqr-neg2.8%
sqrt-unprod2.2%
add-sqr-sqrt2.9%
sub-neg2.9%
+-inverses2.9%
metadata-eval2.9%
metadata-eval2.9%
Applied egg-rr2.9%
Final simplification2.9%
herbie shell --seed 2024044
(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))))))))