
(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 (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 98.5%
*-commutative98.5%
associate-/l*98.5%
fma-define98.5%
metadata-eval98.5%
distribute-frac-neg98.5%
distribute-frac-neg298.5%
Simplified98.5%
(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(g / Float64(-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 98.5%
*-commutative98.5%
associate-/l*98.5%
metadata-eval98.5%
distribute-frac-neg98.5%
distribute-frac-neg298.5%
Simplified98.5%
Final simplification98.5%
(FPCore (g h) :precision binary64 (* 2.0 (cos (- (* PI 1.1666666666666667) (asin (/ g h))))))
double code(double g, double h) {
return 2.0 * cos(((((double) M_PI) * 1.1666666666666667) - asin((g / h))));
}
public static double code(double g, double h) {
return 2.0 * Math.cos(((Math.PI * 1.1666666666666667) - Math.asin((g / h))));
}
def code(g, h): return 2.0 * math.cos(((math.pi * 1.1666666666666667) - math.asin((g / h))))
function code(g, h) return Float64(2.0 * cos(Float64(Float64(pi * 1.1666666666666667) - asin(Float64(g / h))))) end
function tmp = code(g, h) tmp = 2.0 * cos(((pi * 1.1666666666666667) - asin((g / h)))); end
code[g_, h_] := N[(2.0 * N[Cos[N[(N[(Pi * 1.1666666666666667), $MachinePrecision] - N[ArcSin[N[(g / h), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
2 \cdot \cos \left(\pi \cdot 1.1666666666666667 - \sin^{-1} \left(\frac{g}{h}\right)\right)
\end{array}
Initial program 98.5%
*-commutative98.5%
associate-/l*98.5%
metadata-eval98.5%
distribute-frac-neg98.5%
distribute-frac-neg298.5%
Simplified98.5%
fma-define98.5%
frac-2neg98.5%
distribute-frac-neg98.5%
fmm-undef98.5%
add-sqr-sqrt48.1%
sqrt-unprod91.0%
sqr-neg91.0%
sqrt-unprod48.9%
add-sqr-sqrt96.2%
metadata-eval96.2%
Applied egg-rr96.2%
Applied egg-rr94.3%
+-commutative94.3%
fma-define94.3%
+-commutative94.3%
associate-+r+95.3%
fma-undefine95.3%
*-commutative95.3%
distribute-lft-out95.3%
metadata-eval95.3%
distribute-lft-out95.3%
metadata-eval95.3%
*-rgt-identity95.3%
*-commutative95.3%
Simplified95.3%
acos-asin95.3%
associate-+l-95.3%
div-inv95.3%
metadata-eval95.3%
Applied egg-rr95.3%
associate--r-95.3%
+-commutative95.3%
associate--l+95.3%
*-commutative95.3%
distribute-lft-out94.3%
metadata-eval97.7%
Simplified97.7%
(FPCore (g h) :precision binary64 (* 2.0 (cos (+ (acos (/ g h)) (* PI 0.6666666666666666)))))
double code(double g, double h) {
return 2.0 * cos((acos((g / h)) + (((double) M_PI) * 0.6666666666666666)));
}
public static double code(double g, double h) {
return 2.0 * Math.cos((Math.acos((g / h)) + (Math.PI * 0.6666666666666666)));
}
def code(g, h): return 2.0 * math.cos((math.acos((g / h)) + (math.pi * 0.6666666666666666)))
function code(g, h) return Float64(2.0 * cos(Float64(acos(Float64(g / h)) + Float64(pi * 0.6666666666666666)))) end
function tmp = code(g, h) tmp = 2.0 * cos((acos((g / h)) + (pi * 0.6666666666666666))); end
code[g_, h_] := N[(2.0 * N[Cos[N[(N[ArcCos[N[(g / h), $MachinePrecision]], $MachinePrecision] + N[(Pi * 0.6666666666666666), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
2 \cdot \cos \left(\cos^{-1} \left(\frac{g}{h}\right) + \pi \cdot 0.6666666666666666\right)
\end{array}
Initial program 98.5%
*-commutative98.5%
associate-/l*98.5%
metadata-eval98.5%
distribute-frac-neg98.5%
distribute-frac-neg298.5%
Simplified98.5%
fma-define98.5%
frac-2neg98.5%
distribute-frac-neg98.5%
fmm-undef98.5%
add-sqr-sqrt48.1%
sqrt-unprod91.0%
sqr-neg91.0%
sqrt-unprod48.9%
add-sqr-sqrt96.2%
metadata-eval96.2%
Applied egg-rr96.2%
Applied egg-rr94.3%
+-commutative94.3%
fma-define94.3%
+-commutative94.3%
associate-+r+95.3%
fma-undefine95.3%
*-commutative95.3%
distribute-lft-out95.3%
metadata-eval95.3%
distribute-lft-out95.3%
metadata-eval95.3%
*-rgt-identity95.3%
*-commutative95.3%
Simplified95.3%
Final simplification95.3%
herbie shell --seed 2024132
(FPCore (g h)
:name "2-ancestry mixing, negative discriminant"
:precision binary64
(* 2.0 (cos (+ (/ (* 2.0 PI) 3.0) (/ (acos (/ (- g) h)) 3.0)))))