
(FPCore (x y z t) :precision binary64 (* (/ 1.0 3.0) (acos (* (/ (* 3.0 (/ x (* y 27.0))) (* z 2.0)) (sqrt t)))))
double code(double x, double y, double z, double t) {
return (1.0 / 3.0) * acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * sqrt(t)));
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
code = (1.0d0 / 3.0d0) * acos((((3.0d0 * (x / (y * 27.0d0))) / (z * 2.0d0)) * sqrt(t)))
end function
public static double code(double x, double y, double z, double t) {
return (1.0 / 3.0) * Math.acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * Math.sqrt(t)));
}
def code(x, y, z, t): return (1.0 / 3.0) * math.acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * math.sqrt(t)))
function code(x, y, z, t) return Float64(Float64(1.0 / 3.0) * acos(Float64(Float64(Float64(3.0 * Float64(x / Float64(y * 27.0))) / Float64(z * 2.0)) * sqrt(t)))) end
function tmp = code(x, y, z, t) tmp = (1.0 / 3.0) * acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * sqrt(t))); end
code[x_, y_, z_, t_] := N[(N[(1.0 / 3.0), $MachinePrecision] * N[ArcCos[N[(N[(N[(3.0 * N[(x / N[(y * 27.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / N[(z * 2.0), $MachinePrecision]), $MachinePrecision] * N[Sqrt[t], $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right)
\end{array}
Sampling outcomes in binary64 precision:
Herbie found 5 alternatives:
| Alternative | Accuracy | Speedup |
|---|
(FPCore (x y z t) :precision binary64 (* (/ 1.0 3.0) (acos (* (/ (* 3.0 (/ x (* y 27.0))) (* z 2.0)) (sqrt t)))))
double code(double x, double y, double z, double t) {
return (1.0 / 3.0) * acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * sqrt(t)));
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
code = (1.0d0 / 3.0d0) * acos((((3.0d0 * (x / (y * 27.0d0))) / (z * 2.0d0)) * sqrt(t)))
end function
public static double code(double x, double y, double z, double t) {
return (1.0 / 3.0) * Math.acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * Math.sqrt(t)));
}
def code(x, y, z, t): return (1.0 / 3.0) * math.acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * math.sqrt(t)))
function code(x, y, z, t) return Float64(Float64(1.0 / 3.0) * acos(Float64(Float64(Float64(3.0 * Float64(x / Float64(y * 27.0))) / Float64(z * 2.0)) * sqrt(t)))) end
function tmp = code(x, y, z, t) tmp = (1.0 / 3.0) * acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * sqrt(t))); end
code[x_, y_, z_, t_] := N[(N[(1.0 / 3.0), $MachinePrecision] * N[ArcCos[N[(N[(N[(3.0 * N[(x / N[(y * 27.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / N[(z * 2.0), $MachinePrecision]), $MachinePrecision] * N[Sqrt[t], $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right)
\end{array}
(FPCore (x y z t)
:precision binary64
(fma
PI
0.16666666666666666
(*
(fma
(* (sqrt PI) 0.5)
(sqrt PI)
(- (acos (* (/ x (* y z)) (* 0.05555555555555555 (sqrt t))))))
-0.3333333333333333)))
double code(double x, double y, double z, double t) {
return fma(((double) M_PI), 0.16666666666666666, (fma((sqrt(((double) M_PI)) * 0.5), sqrt(((double) M_PI)), -acos(((x / (y * z)) * (0.05555555555555555 * sqrt(t))))) * -0.3333333333333333));
}
function code(x, y, z, t) return fma(pi, 0.16666666666666666, Float64(fma(Float64(sqrt(pi) * 0.5), sqrt(pi), Float64(-acos(Float64(Float64(x / Float64(y * z)) * Float64(0.05555555555555555 * sqrt(t)))))) * -0.3333333333333333)) end
code[x_, y_, z_, t_] := N[(Pi * 0.16666666666666666 + N[(N[(N[(N[Sqrt[Pi], $MachinePrecision] * 0.5), $MachinePrecision] * N[Sqrt[Pi], $MachinePrecision] + (-N[ArcCos[N[(N[(x / N[(y * z), $MachinePrecision]), $MachinePrecision] * N[(0.05555555555555555 * N[Sqrt[t], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision])), $MachinePrecision] * -0.3333333333333333), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\mathsf{fma}\left(\pi, 0.16666666666666666, \mathsf{fma}\left(\sqrt{\pi} \cdot 0.5, \sqrt{\pi}, -\cos^{-1} \left(\frac{x}{y \cdot z} \cdot \left(0.05555555555555555 \cdot \sqrt{t}\right)\right)\right) \cdot -0.3333333333333333\right)
\end{array}
Initial program 97.3%
Applied rewrites98.1%
Applied rewrites96.9%
lift-asin.f64N/A
asin-acosN/A
lift-acos.f64N/A
sub-negN/A
lift-PI.f64N/A
div-invN/A
metadata-evalN/A
*-commutativeN/A
lift-PI.f64N/A
add-sqr-sqrtN/A
associate-*r*N/A
lower-fma.f64N/A
lower-*.f64N/A
lift-PI.f64N/A
lower-sqrt.f64N/A
lift-PI.f64N/A
lower-sqrt.f64N/A
lower-neg.f6498.4
Applied rewrites99.6%
Final simplification99.6%
(FPCore (x y z t) :precision binary64 (fma (* -0.16666666666666666 (sqrt PI)) (sqrt PI) (fma 0.3333333333333333 (acos (* (* (/ x (* y z)) 0.05555555555555555) (sqrt t))) (* 0.16666666666666666 PI))))
double code(double x, double y, double z, double t) {
return fma((-0.16666666666666666 * sqrt(((double) M_PI))), sqrt(((double) M_PI)), fma(0.3333333333333333, acos((((x / (y * z)) * 0.05555555555555555) * sqrt(t))), (0.16666666666666666 * ((double) M_PI))));
}
function code(x, y, z, t) return fma(Float64(-0.16666666666666666 * sqrt(pi)), sqrt(pi), fma(0.3333333333333333, acos(Float64(Float64(Float64(x / Float64(y * z)) * 0.05555555555555555) * sqrt(t))), Float64(0.16666666666666666 * pi))) end
code[x_, y_, z_, t_] := N[(N[(-0.16666666666666666 * N[Sqrt[Pi], $MachinePrecision]), $MachinePrecision] * N[Sqrt[Pi], $MachinePrecision] + N[(0.3333333333333333 * N[ArcCos[N[(N[(N[(x / N[(y * z), $MachinePrecision]), $MachinePrecision] * 0.05555555555555555), $MachinePrecision] * N[Sqrt[t], $MachinePrecision]), $MachinePrecision]], $MachinePrecision] + N[(0.16666666666666666 * Pi), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\mathsf{fma}\left(-0.16666666666666666 \cdot \sqrt{\pi}, \sqrt{\pi}, \mathsf{fma}\left(0.3333333333333333, \cos^{-1} \left(\left(\frac{x}{y \cdot z} \cdot 0.05555555555555555\right) \cdot \sqrt{t}\right), 0.16666666666666666 \cdot \pi\right)\right)
\end{array}
Initial program 97.3%
Applied rewrites98.1%
lift-*.f64N/A
*-commutativeN/A
lift-PI.f64N/A
add-cube-cbrtN/A
associate-*l*N/A
lower-*.f64N/A
pow2N/A
lift-PI.f64N/A
pow1/3N/A
pow-powN/A
metadata-evalN/A
metadata-evalN/A
lower-pow.f64N/A
metadata-evalN/A
lift-PI.f64N/A
pow1/3N/A
lift-*.f64N/A
pow2N/A
pow-prod-upN/A
lower-pow.f64N/A
metadata-eval99.6
Applied rewrites99.6%
Applied rewrites98.1%
Applied rewrites99.6%
(FPCore (x y z t) :precision binary64 (/ (acos (* (/ x (* y z)) (* 0.05555555555555555 (sqrt t)))) 3.0))
double code(double x, double y, double z, double t) {
return acos(((x / (y * z)) * (0.05555555555555555 * sqrt(t)))) / 3.0;
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
code = acos(((x / (y * z)) * (0.05555555555555555d0 * sqrt(t)))) / 3.0d0
end function
public static double code(double x, double y, double z, double t) {
return Math.acos(((x / (y * z)) * (0.05555555555555555 * Math.sqrt(t)))) / 3.0;
}
def code(x, y, z, t): return math.acos(((x / (y * z)) * (0.05555555555555555 * math.sqrt(t)))) / 3.0
function code(x, y, z, t) return Float64(acos(Float64(Float64(x / Float64(y * z)) * Float64(0.05555555555555555 * sqrt(t)))) / 3.0) end
function tmp = code(x, y, z, t) tmp = acos(((x / (y * z)) * (0.05555555555555555 * sqrt(t)))) / 3.0; end
code[x_, y_, z_, t_] := N[(N[ArcCos[N[(N[(x / N[(y * z), $MachinePrecision]), $MachinePrecision] * N[(0.05555555555555555 * N[Sqrt[t], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] / 3.0), $MachinePrecision]
\begin{array}{l}
\\
\frac{\cos^{-1} \left(\frac{x}{y \cdot z} \cdot \left(0.05555555555555555 \cdot \sqrt{t}\right)\right)}{3}
\end{array}
Initial program 97.3%
Applied rewrites98.1%
lift-*.f64N/A
*-commutativeN/A
lift-PI.f64N/A
add-cube-cbrtN/A
associate-*l*N/A
lower-*.f64N/A
pow2N/A
lift-PI.f64N/A
pow1/3N/A
pow-powN/A
metadata-evalN/A
metadata-evalN/A
lower-pow.f64N/A
metadata-evalN/A
lift-PI.f64N/A
pow1/3N/A
lift-*.f64N/A
pow2N/A
pow-prod-upN/A
lower-pow.f64N/A
metadata-eval99.6
Applied rewrites99.6%
Applied rewrites98.1%
Final simplification98.1%
(FPCore (x y z t) :precision binary64 (* (acos (* (* -0.05555555555555555 x) (/ (sqrt t) (* y z)))) 0.3333333333333333))
double code(double x, double y, double z, double t) {
return acos(((-0.05555555555555555 * x) * (sqrt(t) / (y * z)))) * 0.3333333333333333;
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
code = acos((((-0.05555555555555555d0) * x) * (sqrt(t) / (y * z)))) * 0.3333333333333333d0
end function
public static double code(double x, double y, double z, double t) {
return Math.acos(((-0.05555555555555555 * x) * (Math.sqrt(t) / (y * z)))) * 0.3333333333333333;
}
def code(x, y, z, t): return math.acos(((-0.05555555555555555 * x) * (math.sqrt(t) / (y * z)))) * 0.3333333333333333
function code(x, y, z, t) return Float64(acos(Float64(Float64(-0.05555555555555555 * x) * Float64(sqrt(t) / Float64(y * z)))) * 0.3333333333333333) end
function tmp = code(x, y, z, t) tmp = acos(((-0.05555555555555555 * x) * (sqrt(t) / (y * z)))) * 0.3333333333333333; end
code[x_, y_, z_, t_] := N[(N[ArcCos[N[(N[(-0.05555555555555555 * x), $MachinePrecision] * N[(N[Sqrt[t], $MachinePrecision] / N[(y * z), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] * 0.3333333333333333), $MachinePrecision]
\begin{array}{l}
\\
\cos^{-1} \left(\left(-0.05555555555555555 \cdot x\right) \cdot \frac{\sqrt{t}}{y \cdot z}\right) \cdot 0.3333333333333333
\end{array}
Initial program 97.3%
Taylor expanded in t around -inf
*-commutativeN/A
lower-*.f64N/A
Applied rewrites97.0%
Final simplification97.0%
(FPCore (x y z t) :precision binary64 (* (acos (* (* x (sqrt t)) (/ 0.05555555555555555 (* y z)))) 0.3333333333333333))
double code(double x, double y, double z, double t) {
return acos(((x * sqrt(t)) * (0.05555555555555555 / (y * z)))) * 0.3333333333333333;
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
code = acos(((x * sqrt(t)) * (0.05555555555555555d0 / (y * z)))) * 0.3333333333333333d0
end function
public static double code(double x, double y, double z, double t) {
return Math.acos(((x * Math.sqrt(t)) * (0.05555555555555555 / (y * z)))) * 0.3333333333333333;
}
def code(x, y, z, t): return math.acos(((x * math.sqrt(t)) * (0.05555555555555555 / (y * z)))) * 0.3333333333333333
function code(x, y, z, t) return Float64(acos(Float64(Float64(x * sqrt(t)) * Float64(0.05555555555555555 / Float64(y * z)))) * 0.3333333333333333) end
function tmp = code(x, y, z, t) tmp = acos(((x * sqrt(t)) * (0.05555555555555555 / (y * z)))) * 0.3333333333333333; end
code[x_, y_, z_, t_] := N[(N[ArcCos[N[(N[(x * N[Sqrt[t], $MachinePrecision]), $MachinePrecision] * N[(0.05555555555555555 / N[(y * z), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] * 0.3333333333333333), $MachinePrecision]
\begin{array}{l}
\\
\cos^{-1} \left(\left(x \cdot \sqrt{t}\right) \cdot \frac{0.05555555555555555}{y \cdot z}\right) \cdot 0.3333333333333333
\end{array}
Initial program 97.3%
Taylor expanded in x around 0
*-commutativeN/A
lower-*.f64N/A
lower-acos.f64N/A
associate-*r/N/A
associate-*r/N/A
associate-*l/N/A
lower-*.f64N/A
lower-/.f64N/A
*-commutativeN/A
lower-*.f64N/A
lower-*.f64N/A
lower-sqrt.f6496.9
Applied rewrites96.9%
Final simplification96.9%
(FPCore (x y z t) :precision binary64 (/ (acos (* (/ (/ x 27.0) (* y z)) (/ (sqrt t) (/ 2.0 3.0)))) 3.0))
double code(double x, double y, double z, double t) {
return acos((((x / 27.0) / (y * z)) * (sqrt(t) / (2.0 / 3.0)))) / 3.0;
}
real(8) function code(x, y, z, t)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
code = acos((((x / 27.0d0) / (y * z)) * (sqrt(t) / (2.0d0 / 3.0d0)))) / 3.0d0
end function
public static double code(double x, double y, double z, double t) {
return Math.acos((((x / 27.0) / (y * z)) * (Math.sqrt(t) / (2.0 / 3.0)))) / 3.0;
}
def code(x, y, z, t): return math.acos((((x / 27.0) / (y * z)) * (math.sqrt(t) / (2.0 / 3.0)))) / 3.0
function code(x, y, z, t) return Float64(acos(Float64(Float64(Float64(x / 27.0) / Float64(y * z)) * Float64(sqrt(t) / Float64(2.0 / 3.0)))) / 3.0) end
function tmp = code(x, y, z, t) tmp = acos((((x / 27.0) / (y * z)) * (sqrt(t) / (2.0 / 3.0)))) / 3.0; end
code[x_, y_, z_, t_] := N[(N[ArcCos[N[(N[(N[(x / 27.0), $MachinePrecision] / N[(y * z), $MachinePrecision]), $MachinePrecision] * N[(N[Sqrt[t], $MachinePrecision] / N[(2.0 / 3.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] / 3.0), $MachinePrecision]
\begin{array}{l}
\\
\frac{\cos^{-1} \left(\frac{\frac{x}{27}}{y \cdot z} \cdot \frac{\sqrt{t}}{\frac{2}{3}}\right)}{3}
\end{array}
herbie shell --seed 2024235
(FPCore (x y z t)
:name "Diagrams.Solve.Polynomial:cubForm from diagrams-solve-0.1, D"
:precision binary64
:alt
(! :herbie-platform default (/ (acos (* (/ (/ x 27) (* y z)) (/ (sqrt t) (/ 2 3)))) 3))
(* (/ 1.0 3.0) (acos (* (/ (* 3.0 (/ x (* y 27.0))) (* z 2.0)) (sqrt t)))))