
(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 2 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 (* 2.0 (cos (+ (* 0.6666666666666666 PI) (/ (acos (- (/ g h))) 3.0)))))
double code(double g, double h) {
return 2.0 * cos(((0.6666666666666666 * ((double) M_PI)) + (acos(-(g / h)) / 3.0)));
}
public static double code(double g, double h) {
return 2.0 * Math.cos(((0.6666666666666666 * Math.PI) + (Math.acos(-(g / h)) / 3.0)));
}
def code(g, h): return 2.0 * math.cos(((0.6666666666666666 * math.pi) + (math.acos(-(g / h)) / 3.0)))
function code(g, h) return Float64(2.0 * cos(Float64(Float64(0.6666666666666666 * pi) + Float64(acos(Float64(-Float64(g / h))) / 3.0)))) end
function tmp = code(g, h) tmp = 2.0 * cos(((0.6666666666666666 * pi) + (acos(-(g / h)) / 3.0))); end
code[g_, h_] := N[(2.0 * N[Cos[N[(N[(0.6666666666666666 * Pi), $MachinePrecision] + N[(N[ArcCos[(-N[(g / h), $MachinePrecision])], $MachinePrecision] / 3.0), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
2 \cdot \cos \left(0.6666666666666666 \cdot \pi + \frac{\cos^{-1} \left(-\frac{g}{h}\right)}{3}\right)
\end{array}
Initial program 98.5%
associate-/l*98.5%
associate-/r/98.5%
metadata-eval98.5%
Simplified98.5%
Final simplification98.5%
(FPCore (g h) :precision binary64 (* 2.0 (cos (+ (* 0.6666666666666666 PI) (* (acos (/ g h)) 0.3333333333333333)))))
double code(double g, double h) {
return 2.0 * cos(((0.6666666666666666 * ((double) M_PI)) + (acos((g / h)) * 0.3333333333333333)));
}
public static double code(double g, double h) {
return 2.0 * Math.cos(((0.6666666666666666 * Math.PI) + (Math.acos((g / h)) * 0.3333333333333333)));
}
def code(g, h): return 2.0 * math.cos(((0.6666666666666666 * math.pi) + (math.acos((g / h)) * 0.3333333333333333)))
function code(g, h) return Float64(2.0 * cos(Float64(Float64(0.6666666666666666 * pi) + Float64(acos(Float64(g / h)) * 0.3333333333333333)))) end
function tmp = code(g, h) tmp = 2.0 * cos(((0.6666666666666666 * pi) + (acos((g / h)) * 0.3333333333333333))); end
code[g_, h_] := N[(2.0 * N[Cos[N[(N[(0.6666666666666666 * Pi), $MachinePrecision] + N[(N[ArcCos[N[(g / h), $MachinePrecision]], $MachinePrecision] * 0.3333333333333333), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
2 \cdot \cos \left(0.6666666666666666 \cdot \pi + \cos^{-1} \left(\frac{g}{h}\right) \cdot 0.3333333333333333\right)
\end{array}
Initial program 98.5%
associate-/l*98.5%
associate-/r/98.5%
metadata-eval98.5%
Simplified98.5%
div-inv98.5%
add-sqr-sqrt48.4%
sqrt-unprod92.1%
sqr-neg92.1%
sqrt-unprod48.6%
add-sqr-sqrt96.1%
metadata-eval96.1%
Applied egg-rr96.1%
Final simplification96.1%
herbie shell --seed 2023181
(FPCore (g h)
:name "2-ancestry mixing, negative discriminant"
:precision binary64
(* 2.0 (cos (+ (/ (* 2.0 PI) 3.0) (/ (acos (/ (- g) h)) 3.0)))))