
(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 3 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 (- g)) (cbrt a)))
double code(double g, double h, double a) {
return cbrt(-g) / cbrt(a);
}
public static double code(double g, double h, double a) {
return Math.cbrt(-g) / Math.cbrt(a);
}
function code(g, h, a) return Float64(cbrt(Float64(-g)) / cbrt(a)) end
code[g_, h_, a_] := N[(N[Power[(-g), 1/3], $MachinePrecision] / N[Power[a, 1/3], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\frac{\sqrt[3]{-g}}{\sqrt[3]{a}}
\end{array}
Initial program 45.1%
Simplified45.1%
Taylor expanded in g around -inf 28.0%
*-commutative28.0%
Simplified28.0%
Taylor expanded in g around inf 15.0%
pow1/37.5%
add-log-exp26.7%
*-commutative26.7%
exp-prod39.7%
add-sqr-sqrt39.1%
sqrt-prod51.1%
sqr-neg51.1%
sqrt-unprod46.5%
add-sqr-sqrt72.0%
sub-neg72.0%
+-inverses72.0%
metadata-eval72.0%
metadata-eval72.0%
metadata-eval72.0%
Applied egg-rr72.0%
associate-*l/72.0%
cbrt-div95.3%
*-commutative95.3%
associate-*r*95.7%
metadata-eval95.7%
neg-mul-195.7%
Applied egg-rr95.7%
Final simplification95.7%
(FPCore (g h a) :precision binary64 (- (cbrt (/ g a))))
double code(double g, double h, double a) {
return -cbrt((g / a));
}
public static double code(double g, double h, double a) {
return -Math.cbrt((g / a));
}
function code(g, h, a) return Float64(-cbrt(Float64(g / a))) end
code[g_, h_, a_] := (-N[Power[N[(g / a), $MachinePrecision], 1/3], $MachinePrecision])
\begin{array}{l}
\\
-\sqrt[3]{\frac{g}{a}}
\end{array}
Initial program 45.1%
Simplified45.1%
Taylor expanded in g around -inf 28.0%
*-commutative28.0%
Simplified28.0%
Taylor expanded in g around inf 15.0%
pow1/37.5%
add-log-exp26.7%
*-commutative26.7%
exp-prod39.7%
add-sqr-sqrt39.1%
sqrt-prod51.1%
sqr-neg51.1%
sqrt-unprod46.5%
add-sqr-sqrt72.0%
sub-neg72.0%
+-inverses72.0%
metadata-eval72.0%
metadata-eval72.0%
metadata-eval72.0%
Applied egg-rr72.0%
Taylor expanded in g around -inf 72.4%
mul-1-neg72.4%
Simplified72.4%
Final simplification72.4%
(FPCore (g h a) :precision binary64 (cbrt (/ g a)))
double code(double g, double h, double a) {
return cbrt((g / a));
}
public static double code(double g, double h, double a) {
return Math.cbrt((g / a));
}
function code(g, h, a) return cbrt(Float64(g / a)) end
code[g_, h_, a_] := N[Power[N[(g / a), $MachinePrecision], 1/3], $MachinePrecision]
\begin{array}{l}
\\
\sqrt[3]{\frac{g}{a}}
\end{array}
Initial program 45.1%
Simplified45.1%
Taylor expanded in g around -inf 28.0%
*-commutative28.0%
Simplified28.0%
Taylor expanded in g around inf 15.0%
pow1/37.5%
add-log-exp26.7%
*-commutative26.7%
exp-prod39.7%
add-sqr-sqrt39.1%
sqrt-prod51.1%
sqr-neg51.1%
sqrt-unprod46.5%
add-sqr-sqrt72.0%
sub-neg72.0%
+-inverses72.0%
metadata-eval72.0%
metadata-eval72.0%
metadata-eval72.0%
Applied egg-rr72.0%
associate-*l/72.0%
*-commutative72.0%
associate-*r*72.4%
metadata-eval72.4%
neg-mul-172.4%
add-sqr-sqrt35.0%
sqrt-unprod23.3%
sqr-neg23.3%
sqrt-prod0.7%
add-sqr-sqrt1.3%
Applied egg-rr1.3%
Final simplification1.3%
herbie shell --seed 2024093
(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))))))))