
(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
(*
2.0
(*
3.0
(log
(cbrt
(exp
(cos
(+
(* (acos (/ g h)) 0.3333333333333333)
(* 0.6666666666666666 PI)))))))))
double code(double g, double h) {
return 2.0 * (3.0 * log(cbrt(exp(cos(((acos((g / h)) * 0.3333333333333333) + (0.6666666666666666 * ((double) M_PI))))))));
}
public static double code(double g, double h) {
return 2.0 * (3.0 * Math.log(Math.cbrt(Math.exp(Math.cos(((Math.acos((g / h)) * 0.3333333333333333) + (0.6666666666666666 * Math.PI)))))));
}
function code(g, h) return Float64(2.0 * Float64(3.0 * log(cbrt(exp(cos(Float64(Float64(acos(Float64(g / h)) * 0.3333333333333333) + Float64(0.6666666666666666 * pi)))))))) end
code[g_, h_] := N[(2.0 * N[(3.0 * N[Log[N[Power[N[Exp[N[Cos[N[(N[(N[ArcCos[N[(g / h), $MachinePrecision]], $MachinePrecision] * 0.3333333333333333), $MachinePrecision] + N[(0.6666666666666666 * Pi), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]], $MachinePrecision], 1/3], $MachinePrecision]], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
2 \cdot \left(3 \cdot \log \left(\sqrt[3]{e^{\cos \left(\cos^{-1} \left(\frac{g}{h}\right) \cdot 0.3333333333333333 + 0.6666666666666666 \cdot \pi\right)}}\right)\right)
\end{array}
Initial program 98.4%
associate-/l*98.4%
associate-/r/98.4%
*-commutative98.4%
fma-def98.5%
metadata-eval98.5%
*-lft-identity98.5%
metadata-eval98.5%
times-frac98.5%
neg-mul-198.5%
neg-mul-198.5%
remove-double-neg98.5%
Simplified98.5%
fma-udef98.4%
*-commutative98.4%
+-commutative98.4%
div-inv98.4%
remove-double-neg98.4%
frac-2neg98.4%
add-sqr-sqrt51.5%
sqrt-unprod92.8%
sqr-neg92.8%
sqrt-unprod46.3%
add-sqr-sqrt97.3%
metadata-eval97.3%
Applied egg-rr97.3%
add-log-exp97.3%
+-commutative97.3%
fma-udef97.3%
add-cube-cbrt98.8%
log-prod98.8%
Applied egg-rr98.8%
log-prod98.8%
count-298.8%
distribute-lft1-in98.8%
metadata-eval98.8%
fma-def98.8%
*-commutative98.8%
fma-def98.8%
Simplified98.8%
fma-udef98.8%
*-commutative98.8%
Applied egg-rr98.8%
Final simplification98.8%
(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(g / Float64(-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%
associate-/l*98.4%
associate-/r/98.4%
*-commutative98.4%
fma-def98.5%
metadata-eval98.5%
*-lft-identity98.5%
metadata-eval98.5%
times-frac98.5%
neg-mul-198.5%
neg-mul-198.5%
remove-double-neg98.5%
Simplified98.5%
Final simplification98.5%
(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 98.4%
associate-/l*98.4%
associate-/r/98.4%
metadata-eval98.4%
Simplified98.4%
Final simplification98.4%
(FPCore (g h) :precision binary64 (* 2.0 (cos (+ (* (acos (/ g h)) 0.3333333333333333) (* 0.6666666666666666 PI)))))
double code(double g, double h) {
return 2.0 * cos(((acos((g / h)) * 0.3333333333333333) + (0.6666666666666666 * ((double) M_PI))));
}
public static double code(double g, double h) {
return 2.0 * Math.cos(((Math.acos((g / h)) * 0.3333333333333333) + (0.6666666666666666 * Math.PI)));
}
def code(g, h): return 2.0 * math.cos(((math.acos((g / h)) * 0.3333333333333333) + (0.6666666666666666 * math.pi)))
function code(g, h) return Float64(2.0 * cos(Float64(Float64(acos(Float64(g / h)) * 0.3333333333333333) + Float64(0.6666666666666666 * pi)))) end
function tmp = code(g, h) tmp = 2.0 * cos(((acos((g / h)) * 0.3333333333333333) + (0.6666666666666666 * pi))); end
code[g_, h_] := N[(2.0 * N[Cos[N[(N[(N[ArcCos[N[(g / h), $MachinePrecision]], $MachinePrecision] * 0.3333333333333333), $MachinePrecision] + N[(0.6666666666666666 * Pi), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
2 \cdot \cos \left(\cos^{-1} \left(\frac{g}{h}\right) \cdot 0.3333333333333333 + 0.6666666666666666 \cdot \pi\right)
\end{array}
Initial program 98.4%
associate-/l*98.4%
associate-/r/98.4%
*-commutative98.4%
fma-def98.5%
metadata-eval98.5%
*-lft-identity98.5%
metadata-eval98.5%
times-frac98.5%
neg-mul-198.5%
neg-mul-198.5%
remove-double-neg98.5%
Simplified98.5%
fma-udef98.4%
*-commutative98.4%
+-commutative98.4%
div-inv98.4%
remove-double-neg98.4%
frac-2neg98.4%
add-sqr-sqrt51.5%
sqrt-unprod92.8%
sqr-neg92.8%
sqrt-unprod46.3%
add-sqr-sqrt97.3%
metadata-eval97.3%
Applied egg-rr97.3%
Final simplification97.3%
herbie shell --seed 2023268
(FPCore (g h)
:name "2-ancestry mixing, negative discriminant"
:precision binary64
(* 2.0 (cos (+ (/ (* 2.0 PI) 3.0) (/ (acos (/ (- g) h)) 3.0)))))