
(FPCore (g h) :precision binary64 (* 2.0 (cos (+ (/ (* 2.0 PI) 3.0) (/ (acos (/ (- g) h)) 3.0)))))
double code(double g, double h) {
return 2.0 * cos((((2.0 * ((double) M_PI)) / 3.0) + (acos((-g / h)) / 3.0)));
}
public static double code(double g, double h) {
return 2.0 * Math.cos((((2.0 * Math.PI) / 3.0) + (Math.acos((-g / h)) / 3.0)));
}
def code(g, h): return 2.0 * math.cos((((2.0 * math.pi) / 3.0) + (math.acos((-g / h)) / 3.0)))
function code(g, h) return Float64(2.0 * cos(Float64(Float64(Float64(2.0 * pi) / 3.0) + Float64(acos(Float64(Float64(-g) / h)) / 3.0)))) end
function tmp = code(g, h) tmp = 2.0 * cos((((2.0 * pi) / 3.0) + (acos((-g / h)) / 3.0))); end
code[g_, h_] := N[(2.0 * N[Cos[N[(N[(N[(2.0 * Pi), $MachinePrecision] / 3.0), $MachinePrecision] + N[(N[ArcCos[N[((-g) / h), $MachinePrecision]], $MachinePrecision] / 3.0), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
2 \cdot \cos \left(\frac{2 \cdot \pi}{3} + \frac{\cos^{-1} \left(\frac{-g}{h}\right)}{3}\right)
\end{array}
Sampling outcomes in binary64 precision:
Herbie found 4 alternatives:
| Alternative | Accuracy | Speedup |
|---|
(FPCore (g h) :precision binary64 (* 2.0 (cos (+ (/ (* 2.0 PI) 3.0) (/ (acos (/ (- g) h)) 3.0)))))
double code(double g, double h) {
return 2.0 * cos((((2.0 * ((double) M_PI)) / 3.0) + (acos((-g / h)) / 3.0)));
}
public static double code(double g, double h) {
return 2.0 * Math.cos((((2.0 * Math.PI) / 3.0) + (Math.acos((-g / h)) / 3.0)));
}
def code(g, h): return 2.0 * math.cos((((2.0 * math.pi) / 3.0) + (math.acos((-g / h)) / 3.0)))
function code(g, h) return Float64(2.0 * cos(Float64(Float64(Float64(2.0 * pi) / 3.0) + Float64(acos(Float64(Float64(-g) / h)) / 3.0)))) end
function tmp = code(g, h) tmp = 2.0 * cos((((2.0 * pi) / 3.0) + (acos((-g / h)) / 3.0))); end
code[g_, h_] := N[(2.0 * N[Cos[N[(N[(N[(2.0 * Pi), $MachinePrecision] / 3.0), $MachinePrecision] + N[(N[ArcCos[N[((-g) / h), $MachinePrecision]], $MachinePrecision] / 3.0), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
2 \cdot \cos \left(\frac{2 \cdot \pi}{3} + \frac{\cos^{-1} \left(\frac{-g}{h}\right)}{3}\right)
\end{array}
(FPCore (g h)
:precision binary64
(log1p
(log1p
(expm1
(expm1
(*
2.0
(cos
(fma PI 0.6666666666666666 (* (acos (/ g h)) 0.3333333333333333)))))))))
double code(double g, double h) {
return log1p(log1p(expm1(expm1((2.0 * cos(fma(((double) M_PI), 0.6666666666666666, (acos((g / h)) * 0.3333333333333333))))))));
}
function code(g, h) return log1p(log1p(expm1(expm1(Float64(2.0 * cos(fma(pi, 0.6666666666666666, Float64(acos(Float64(g / h)) * 0.3333333333333333)))))))) end
code[g_, h_] := N[Log[1 + N[Log[1 + N[(Exp[N[(Exp[N[(2.0 * N[Cos[N[(Pi * 0.6666666666666666 + N[(N[ArcCos[N[(g / h), $MachinePrecision]], $MachinePrecision] * 0.3333333333333333), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]] - 1), $MachinePrecision]] - 1), $MachinePrecision]], $MachinePrecision]], $MachinePrecision]
\begin{array}{l}
\\
\mathsf{log1p}\left(\mathsf{log1p}\left(\mathsf{expm1}\left(\mathsf{expm1}\left(2 \cdot \cos \left(\mathsf{fma}\left(\pi, 0.6666666666666666, \cos^{-1} \left(\frac{g}{h}\right) \cdot 0.3333333333333333\right)\right)\right)\right)\right)\right)
\end{array}
Initial program 98.4%
*-commutative98.4%
associate-/l*98.4%
fma-define98.5%
metadata-eval98.5%
distribute-frac-neg98.5%
distribute-frac-neg298.5%
Simplified98.5%
frac-2neg98.5%
distribute-frac-neg98.5%
fmm-undef98.4%
add-sqr-sqrt47.3%
sqrt-unprod93.0%
sqr-neg93.0%
sqrt-unprod50.7%
add-sqr-sqrt97.9%
metadata-eval97.9%
Applied egg-rr97.9%
Applied egg-rr99.4%
log1p-expm1-u99.4%
cbrt-unprod97.0%
unpow297.0%
add-cbrt-cube97.0%
Applied egg-rr97.0%
log1p-expm1-u99.4%
Applied egg-rr99.4%
(FPCore (g h) :precision binary64 (* 2.0 (cos (fma PI 0.6666666666666666 (/ (acos (/ (- g) h)) 3.0)))))
double code(double g, double h) {
return 2.0 * cos(fma(((double) M_PI), 0.6666666666666666, (acos((-g / h)) / 3.0)));
}
function code(g, h) return Float64(2.0 * cos(fma(pi, 0.6666666666666666, Float64(acos(Float64(Float64(-g) / h)) / 3.0)))) end
code[g_, h_] := N[(2.0 * N[Cos[N[(Pi * 0.6666666666666666 + N[(N[ArcCos[N[((-g) / h), $MachinePrecision]], $MachinePrecision] / 3.0), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
2 \cdot \cos \left(\mathsf{fma}\left(\pi, 0.6666666666666666, \frac{\cos^{-1} \left(\frac{-g}{h}\right)}{3}\right)\right)
\end{array}
Initial program 98.4%
*-commutative98.4%
associate-/l*98.4%
fma-define98.5%
metadata-eval98.5%
distribute-frac-neg98.5%
distribute-frac-neg298.5%
Simplified98.5%
Final simplification98.5%
(FPCore (g h) :precision binary64 (* 2.0 (cos (+ (/ (acos (/ (- g) h)) 3.0) (* PI 0.6666666666666666)))))
double code(double g, double h) {
return 2.0 * cos(((acos((-g / h)) / 3.0) + (((double) M_PI) * 0.6666666666666666)));
}
public static double code(double g, double h) {
return 2.0 * Math.cos(((Math.acos((-g / h)) / 3.0) + (Math.PI * 0.6666666666666666)));
}
def code(g, h): return 2.0 * math.cos(((math.acos((-g / h)) / 3.0) + (math.pi * 0.6666666666666666)))
function code(g, h) return Float64(2.0 * cos(Float64(Float64(acos(Float64(Float64(-g) / h)) / 3.0) + Float64(pi * 0.6666666666666666)))) end
function tmp = code(g, h) tmp = 2.0 * cos(((acos((-g / h)) / 3.0) + (pi * 0.6666666666666666))); end
code[g_, h_] := N[(2.0 * N[Cos[N[(N[(N[ArcCos[N[((-g) / h), $MachinePrecision]], $MachinePrecision] / 3.0), $MachinePrecision] + N[(Pi * 0.6666666666666666), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
2 \cdot \cos \left(\frac{\cos^{-1} \left(\frac{-g}{h}\right)}{3} + \pi \cdot 0.6666666666666666\right)
\end{array}
Initial program 98.4%
*-commutative98.4%
associate-/l*98.4%
metadata-eval98.4%
distribute-frac-neg98.4%
distribute-frac-neg298.4%
Simplified98.4%
Final simplification98.4%
(FPCore (g h) :precision binary64 (* 2.0 (cos (- (* PI 0.6666666666666666) (/ (acos (/ g h)) -3.0)))))
double code(double g, double h) {
return 2.0 * cos(((((double) M_PI) * 0.6666666666666666) - (acos((g / h)) / -3.0)));
}
public static double code(double g, double h) {
return 2.0 * Math.cos(((Math.PI * 0.6666666666666666) - (Math.acos((g / h)) / -3.0)));
}
def code(g, h): return 2.0 * math.cos(((math.pi * 0.6666666666666666) - (math.acos((g / h)) / -3.0)))
function code(g, h) return Float64(2.0 * cos(Float64(Float64(pi * 0.6666666666666666) - Float64(acos(Float64(g / h)) / -3.0)))) end
function tmp = code(g, h) tmp = 2.0 * cos(((pi * 0.6666666666666666) - (acos((g / h)) / -3.0))); end
code[g_, h_] := N[(2.0 * N[Cos[N[(N[(Pi * 0.6666666666666666), $MachinePrecision] - N[(N[ArcCos[N[(g / h), $MachinePrecision]], $MachinePrecision] / -3.0), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
2 \cdot \cos \left(\pi \cdot 0.6666666666666666 - \frac{\cos^{-1} \left(\frac{g}{h}\right)}{-3}\right)
\end{array}
Initial program 98.4%
*-commutative98.4%
associate-/l*98.4%
fma-define98.5%
metadata-eval98.5%
distribute-frac-neg98.5%
distribute-frac-neg298.5%
Simplified98.5%
frac-2neg98.5%
distribute-frac-neg98.5%
fmm-undef98.4%
add-sqr-sqrt47.3%
sqrt-unprod93.0%
sqr-neg93.0%
sqrt-unprod50.7%
add-sqr-sqrt97.9%
metadata-eval97.9%
Applied egg-rr97.9%
herbie shell --seed 2024181
(FPCore (g h)
:name "2-ancestry mixing, negative discriminant"
:precision binary64
(* 2.0 (cos (+ (/ (* 2.0 PI) 3.0) (/ (acos (/ (- g) h)) 3.0)))))