
(FPCore (x) :precision binary64 (- (cbrt (+ x 1.0)) (cbrt x)))
double code(double x) {
return cbrt((x + 1.0)) - cbrt(x);
}
public static double code(double x) {
return Math.cbrt((x + 1.0)) - Math.cbrt(x);
}
function code(x) return Float64(cbrt(Float64(x + 1.0)) - cbrt(x)) end
code[x_] := N[(N[Power[N[(x + 1.0), $MachinePrecision], 1/3], $MachinePrecision] - N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\sqrt[3]{x + 1} - \sqrt[3]{x}
\end{array}
Sampling outcomes in binary64 precision:
Herbie found 12 alternatives:
| Alternative | Accuracy | Speedup |
|---|
(FPCore (x) :precision binary64 (- (cbrt (+ x 1.0)) (cbrt x)))
double code(double x) {
return cbrt((x + 1.0)) - cbrt(x);
}
public static double code(double x) {
return Math.cbrt((x + 1.0)) - Math.cbrt(x);
}
function code(x) return Float64(cbrt(Float64(x + 1.0)) - cbrt(x)) end
code[x_] := N[(N[Power[N[(x + 1.0), $MachinePrecision], 1/3], $MachinePrecision] - N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\sqrt[3]{x + 1} - \sqrt[3]{x}
\end{array}
(FPCore (x) :precision binary64 (let* ((t_0 (cbrt (+ 1.0 x))) (t_1 (cbrt (sqrt (+ 1.0 x))))) (/ 1.0 (fma (cbrt x) (+ (cbrt x) t_0) (* (* t_1 t_1) t_0)))))
double code(double x) {
double t_0 = cbrt((1.0 + x));
double t_1 = cbrt(sqrt((1.0 + x)));
return 1.0 / fma(cbrt(x), (cbrt(x) + t_0), ((t_1 * t_1) * t_0));
}
function code(x) t_0 = cbrt(Float64(1.0 + x)) t_1 = cbrt(sqrt(Float64(1.0 + x))) return Float64(1.0 / fma(cbrt(x), Float64(cbrt(x) + t_0), Float64(Float64(t_1 * t_1) * t_0))) end
code[x_] := Block[{t$95$0 = N[Power[N[(1.0 + x), $MachinePrecision], 1/3], $MachinePrecision]}, Block[{t$95$1 = N[Power[N[Sqrt[N[(1.0 + x), $MachinePrecision]], $MachinePrecision], 1/3], $MachinePrecision]}, N[(1.0 / N[(N[Power[x, 1/3], $MachinePrecision] * N[(N[Power[x, 1/3], $MachinePrecision] + t$95$0), $MachinePrecision] + N[(N[(t$95$1 * t$95$1), $MachinePrecision] * t$95$0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]]
\begin{array}{l}
\\
\begin{array}{l}
t_0 := \sqrt[3]{1 + x}\\
t_1 := \sqrt[3]{\sqrt{1 + x}}\\
\frac{1}{\mathsf{fma}\left(\sqrt[3]{x}, \sqrt[3]{x} + t\_0, \left(t\_1 \cdot t\_1\right) \cdot t\_0\right)}
\end{array}
\end{array}
Initial program 6.0%
flip3--6.2%
div-inv6.2%
rem-cube-cbrt5.3%
rem-cube-cbrt7.5%
+-commutative7.5%
distribute-rgt-out7.5%
+-commutative7.5%
fma-define7.5%
add-exp-log7.5%
Applied egg-rr7.5%
associate-*r/7.5%
*-rgt-identity7.5%
+-commutative7.5%
associate--l+93.2%
+-inverses93.2%
metadata-eval93.2%
+-commutative93.2%
exp-prod92.3%
Simplified92.3%
add-sqr-sqrt92.3%
unpow-prod-down93.9%
Applied egg-rr93.9%
add-exp-log93.8%
log-pow93.6%
log1p-undefine93.6%
+-commutative93.6%
pow1/293.6%
log-pow93.6%
rem-log-exp93.6%
metadata-eval93.6%
pow-to-exp93.9%
pow1/395.2%
Applied egg-rr95.2%
add-exp-log94.6%
log-pow94.6%
log1p-undefine94.6%
+-commutative94.6%
pow1/294.6%
log-pow94.6%
rem-log-exp94.6%
metadata-eval94.6%
pow-to-exp94.4%
add-sqr-sqrt94.4%
unpow-prod-down94.4%
+-commutative94.4%
add-sqr-sqrt94.4%
hypot-1-def94.4%
+-commutative94.4%
add-sqr-sqrt94.4%
hypot-1-def94.4%
Applied egg-rr94.4%
unpow1/395.8%
hypot-undefine95.8%
metadata-eval95.8%
rem-square-sqrt95.8%
unpow1/398.5%
hypot-undefine98.5%
metadata-eval98.5%
rem-square-sqrt98.5%
Simplified98.5%
Final simplification98.5%
(FPCore (x) :precision binary64 (let* ((t_0 (cbrt (+ 1.0 x)))) (/ 1.0 (fma (cbrt x) (+ (cbrt x) t_0) (* t_0 t_0)))))
double code(double x) {
double t_0 = cbrt((1.0 + x));
return 1.0 / fma(cbrt(x), (cbrt(x) + t_0), (t_0 * t_0));
}
function code(x) t_0 = cbrt(Float64(1.0 + x)) return Float64(1.0 / fma(cbrt(x), Float64(cbrt(x) + t_0), Float64(t_0 * t_0))) end
code[x_] := Block[{t$95$0 = N[Power[N[(1.0 + x), $MachinePrecision], 1/3], $MachinePrecision]}, N[(1.0 / N[(N[Power[x, 1/3], $MachinePrecision] * N[(N[Power[x, 1/3], $MachinePrecision] + t$95$0), $MachinePrecision] + N[(t$95$0 * t$95$0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
t_0 := \sqrt[3]{1 + x}\\
\frac{1}{\mathsf{fma}\left(\sqrt[3]{x}, \sqrt[3]{x} + t\_0, t\_0 \cdot t\_0\right)}
\end{array}
\end{array}
Initial program 6.0%
flip3--6.2%
div-inv6.2%
rem-cube-cbrt5.3%
rem-cube-cbrt7.5%
+-commutative7.5%
distribute-rgt-out7.5%
+-commutative7.5%
fma-define7.5%
add-exp-log7.5%
Applied egg-rr7.5%
associate-*r/7.5%
*-rgt-identity7.5%
+-commutative7.5%
associate--l+93.2%
+-inverses93.2%
metadata-eval93.2%
+-commutative93.2%
exp-prod92.3%
Simplified92.3%
add-sqr-sqrt92.3%
unpow-prod-down93.9%
Applied egg-rr93.9%
add-exp-log93.8%
log-pow93.6%
log1p-undefine93.6%
+-commutative93.6%
pow1/293.6%
log-pow93.6%
rem-log-exp93.6%
metadata-eval93.6%
pow-to-exp93.9%
pow1/395.2%
Applied egg-rr95.2%
add-exp-log93.8%
log-pow93.6%
log1p-undefine93.6%
+-commutative93.6%
pow1/293.6%
log-pow93.6%
rem-log-exp93.6%
metadata-eval93.6%
pow-to-exp93.9%
pow1/395.2%
Applied egg-rr98.5%
Final simplification98.5%
(FPCore (x)
:precision binary64
(if (<= x 5.5e+161)
(*
(fma
0.3333333333333333
(pow (cbrt x) 4.0)
(* (cbrt x) -0.1111111111111111))
(pow x -2.0))
(/ 1.0 (exp (log (fma (cbrt x) (+ (cbrt x) (cbrt (+ 1.0 x))) 1.0))))))
double code(double x) {
double tmp;
if (x <= 5.5e+161) {
tmp = fma(0.3333333333333333, pow(cbrt(x), 4.0), (cbrt(x) * -0.1111111111111111)) * pow(x, -2.0);
} else {
tmp = 1.0 / exp(log(fma(cbrt(x), (cbrt(x) + cbrt((1.0 + x))), 1.0)));
}
return tmp;
}
function code(x) tmp = 0.0 if (x <= 5.5e+161) tmp = Float64(fma(0.3333333333333333, (cbrt(x) ^ 4.0), Float64(cbrt(x) * -0.1111111111111111)) * (x ^ -2.0)); else tmp = Float64(1.0 / exp(log(fma(cbrt(x), Float64(cbrt(x) + cbrt(Float64(1.0 + x))), 1.0)))); end return tmp end
code[x_] := If[LessEqual[x, 5.5e+161], N[(N[(0.3333333333333333 * N[Power[N[Power[x, 1/3], $MachinePrecision], 4.0], $MachinePrecision] + N[(N[Power[x, 1/3], $MachinePrecision] * -0.1111111111111111), $MachinePrecision]), $MachinePrecision] * N[Power[x, -2.0], $MachinePrecision]), $MachinePrecision], N[(1.0 / N[Exp[N[Log[N[(N[Power[x, 1/3], $MachinePrecision] * N[(N[Power[x, 1/3], $MachinePrecision] + N[Power[N[(1.0 + x), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision] + 1.0), $MachinePrecision]], $MachinePrecision]], $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;x \leq 5.5 \cdot 10^{+161}:\\
\;\;\;\;\mathsf{fma}\left(0.3333333333333333, {\left(\sqrt[3]{x}\right)}^{4}, \sqrt[3]{x} \cdot -0.1111111111111111\right) \cdot {x}^{-2}\\
\mathbf{else}:\\
\;\;\;\;\frac{1}{e^{\log \left(\mathsf{fma}\left(\sqrt[3]{x}, \sqrt[3]{x} + \sqrt[3]{1 + x}, 1\right)\right)}}\\
\end{array}
\end{array}
if x < 5.5000000000000005e161Initial program 7.1%
Taylor expanded in x around inf 42.3%
*-un-lft-identity42.3%
div-inv42.3%
+-commutative42.3%
fma-define42.3%
pow-flip42.5%
metadata-eval42.5%
Applied egg-rr42.5%
*-lft-identity42.5%
unpow1/339.5%
exp-to-pow39.9%
exp-prod88.9%
associate-*l*88.9%
metadata-eval88.9%
exp-to-pow88.5%
metadata-eval88.5%
pow-plus91.3%
unpow1/396.9%
rem-3cbrt-rft95.8%
unpow295.8%
associate-*l*95.7%
unpow295.7%
pow-sqr95.8%
metadata-eval95.8%
*-commutative95.8%
Simplified95.8%
if 5.5000000000000005e161 < x Initial program 4.7%
flip3--4.7%
div-inv4.7%
rem-cube-cbrt3.2%
rem-cube-cbrt4.7%
+-commutative4.7%
distribute-rgt-out4.7%
+-commutative4.7%
fma-define4.7%
add-exp-log4.7%
Applied egg-rr4.7%
associate-*r/4.7%
*-rgt-identity4.7%
+-commutative4.7%
associate--l+91.9%
+-inverses91.9%
metadata-eval91.9%
+-commutative91.9%
exp-prod90.9%
Simplified90.9%
expm1-log1p-u91.0%
expm1-undefine91.0%
Applied egg-rr91.0%
expm1-define91.0%
Simplified91.0%
Taylor expanded in x around 0 20.0%
expm1-log1p-u20.0%
add-exp-log20.0%
+-commutative20.0%
+-commutative20.0%
Applied egg-rr20.0%
Final simplification59.7%
(FPCore (x)
:precision binary64
(if (<= x 5.5e+161)
(*
(fma
0.3333333333333333
(pow (cbrt x) 4.0)
(* (cbrt x) -0.1111111111111111))
(pow x -2.0))
(/ 1.0 (fma (expm1 (log1p (cbrt x))) (+ (cbrt x) (cbrt x)) 1.0))))
double code(double x) {
double tmp;
if (x <= 5.5e+161) {
tmp = fma(0.3333333333333333, pow(cbrt(x), 4.0), (cbrt(x) * -0.1111111111111111)) * pow(x, -2.0);
} else {
tmp = 1.0 / fma(expm1(log1p(cbrt(x))), (cbrt(x) + cbrt(x)), 1.0);
}
return tmp;
}
function code(x) tmp = 0.0 if (x <= 5.5e+161) tmp = Float64(fma(0.3333333333333333, (cbrt(x) ^ 4.0), Float64(cbrt(x) * -0.1111111111111111)) * (x ^ -2.0)); else tmp = Float64(1.0 / fma(expm1(log1p(cbrt(x))), Float64(cbrt(x) + cbrt(x)), 1.0)); end return tmp end
code[x_] := If[LessEqual[x, 5.5e+161], N[(N[(0.3333333333333333 * N[Power[N[Power[x, 1/3], $MachinePrecision], 4.0], $MachinePrecision] + N[(N[Power[x, 1/3], $MachinePrecision] * -0.1111111111111111), $MachinePrecision]), $MachinePrecision] * N[Power[x, -2.0], $MachinePrecision]), $MachinePrecision], N[(1.0 / N[(N[(Exp[N[Log[1 + N[Power[x, 1/3], $MachinePrecision]], $MachinePrecision]] - 1), $MachinePrecision] * N[(N[Power[x, 1/3], $MachinePrecision] + N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision] + 1.0), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;x \leq 5.5 \cdot 10^{+161}:\\
\;\;\;\;\mathsf{fma}\left(0.3333333333333333, {\left(\sqrt[3]{x}\right)}^{4}, \sqrt[3]{x} \cdot -0.1111111111111111\right) \cdot {x}^{-2}\\
\mathbf{else}:\\
\;\;\;\;\frac{1}{\mathsf{fma}\left(\mathsf{expm1}\left(\mathsf{log1p}\left(\sqrt[3]{x}\right)\right), \sqrt[3]{x} + \sqrt[3]{x}, 1\right)}\\
\end{array}
\end{array}
if x < 5.5000000000000005e161Initial program 7.1%
Taylor expanded in x around inf 42.3%
*-un-lft-identity42.3%
div-inv42.3%
+-commutative42.3%
fma-define42.3%
pow-flip42.5%
metadata-eval42.5%
Applied egg-rr42.5%
*-lft-identity42.5%
unpow1/339.5%
exp-to-pow39.9%
exp-prod88.9%
associate-*l*88.9%
metadata-eval88.9%
exp-to-pow88.5%
metadata-eval88.5%
pow-plus91.3%
unpow1/396.9%
rem-3cbrt-rft95.8%
unpow295.8%
associate-*l*95.7%
unpow295.7%
pow-sqr95.8%
metadata-eval95.8%
*-commutative95.8%
Simplified95.8%
if 5.5000000000000005e161 < x Initial program 4.7%
flip3--4.7%
div-inv4.7%
rem-cube-cbrt3.2%
rem-cube-cbrt4.7%
+-commutative4.7%
distribute-rgt-out4.7%
+-commutative4.7%
fma-define4.7%
add-exp-log4.7%
Applied egg-rr4.7%
associate-*r/4.7%
*-rgt-identity4.7%
+-commutative4.7%
associate--l+91.9%
+-inverses91.9%
metadata-eval91.9%
+-commutative91.9%
exp-prod90.9%
Simplified90.9%
expm1-log1p-u91.0%
expm1-undefine91.0%
Applied egg-rr91.0%
expm1-define91.0%
Simplified91.0%
Taylor expanded in x around 0 20.0%
Taylor expanded in x around inf 20.0%
Final simplification59.7%
(FPCore (x) :precision binary64 (/ 1.0 (fma (cbrt x) (+ (cbrt x) (cbrt (+ 1.0 x))) (exp (* (log1p x) 0.6666666666666666)))))
double code(double x) {
return 1.0 / fma(cbrt(x), (cbrt(x) + cbrt((1.0 + x))), exp((log1p(x) * 0.6666666666666666)));
}
function code(x) return Float64(1.0 / fma(cbrt(x), Float64(cbrt(x) + cbrt(Float64(1.0 + x))), exp(Float64(log1p(x) * 0.6666666666666666)))) end
code[x_] := N[(1.0 / N[(N[Power[x, 1/3], $MachinePrecision] * N[(N[Power[x, 1/3], $MachinePrecision] + N[Power[N[(1.0 + x), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision] + N[Exp[N[(N[Log[1 + x], $MachinePrecision] * 0.6666666666666666), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\frac{1}{\mathsf{fma}\left(\sqrt[3]{x}, \sqrt[3]{x} + \sqrt[3]{1 + x}, e^{\mathsf{log1p}\left(x\right) \cdot 0.6666666666666666}\right)}
\end{array}
Initial program 6.0%
flip3--6.2%
div-inv6.2%
rem-cube-cbrt5.3%
rem-cube-cbrt7.5%
+-commutative7.5%
distribute-rgt-out7.5%
+-commutative7.5%
fma-define7.5%
add-exp-log7.5%
Applied egg-rr7.5%
associate-*r/7.5%
*-rgt-identity7.5%
+-commutative7.5%
associate--l+93.2%
+-inverses93.2%
metadata-eval93.2%
+-commutative93.2%
exp-prod92.3%
Simplified92.3%
add-exp-log92.4%
log-pow93.2%
rem-log-exp93.2%
Applied egg-rr93.2%
Final simplification93.2%
(FPCore (x)
:precision binary64
(if (<= x 5.5e+161)
(*
(fma
0.3333333333333333
(pow (cbrt x) 4.0)
(* (cbrt x) -0.1111111111111111))
(pow x -2.0))
(/ 1.0 (+ 1.0 (* (cbrt x) (+ (cbrt x) (cbrt (+ 1.0 x))))))))
double code(double x) {
double tmp;
if (x <= 5.5e+161) {
tmp = fma(0.3333333333333333, pow(cbrt(x), 4.0), (cbrt(x) * -0.1111111111111111)) * pow(x, -2.0);
} else {
tmp = 1.0 / (1.0 + (cbrt(x) * (cbrt(x) + cbrt((1.0 + x)))));
}
return tmp;
}
function code(x) tmp = 0.0 if (x <= 5.5e+161) tmp = Float64(fma(0.3333333333333333, (cbrt(x) ^ 4.0), Float64(cbrt(x) * -0.1111111111111111)) * (x ^ -2.0)); else tmp = Float64(1.0 / Float64(1.0 + Float64(cbrt(x) * Float64(cbrt(x) + cbrt(Float64(1.0 + x)))))); end return tmp end
code[x_] := If[LessEqual[x, 5.5e+161], N[(N[(0.3333333333333333 * N[Power[N[Power[x, 1/3], $MachinePrecision], 4.0], $MachinePrecision] + N[(N[Power[x, 1/3], $MachinePrecision] * -0.1111111111111111), $MachinePrecision]), $MachinePrecision] * N[Power[x, -2.0], $MachinePrecision]), $MachinePrecision], N[(1.0 / N[(1.0 + N[(N[Power[x, 1/3], $MachinePrecision] * N[(N[Power[x, 1/3], $MachinePrecision] + N[Power[N[(1.0 + x), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;x \leq 5.5 \cdot 10^{+161}:\\
\;\;\;\;\mathsf{fma}\left(0.3333333333333333, {\left(\sqrt[3]{x}\right)}^{4}, \sqrt[3]{x} \cdot -0.1111111111111111\right) \cdot {x}^{-2}\\
\mathbf{else}:\\
\;\;\;\;\frac{1}{1 + \sqrt[3]{x} \cdot \left(\sqrt[3]{x} + \sqrt[3]{1 + x}\right)}\\
\end{array}
\end{array}
if x < 5.5000000000000005e161Initial program 7.1%
Taylor expanded in x around inf 42.3%
*-un-lft-identity42.3%
div-inv42.3%
+-commutative42.3%
fma-define42.3%
pow-flip42.5%
metadata-eval42.5%
Applied egg-rr42.5%
*-lft-identity42.5%
unpow1/339.5%
exp-to-pow39.9%
exp-prod88.9%
associate-*l*88.9%
metadata-eval88.9%
exp-to-pow88.5%
metadata-eval88.5%
pow-plus91.3%
unpow1/396.9%
rem-3cbrt-rft95.8%
unpow295.8%
associate-*l*95.7%
unpow295.7%
pow-sqr95.8%
metadata-eval95.8%
*-commutative95.8%
Simplified95.8%
if 5.5000000000000005e161 < x Initial program 4.7%
flip3--4.7%
div-inv4.7%
rem-cube-cbrt3.2%
rem-cube-cbrt4.7%
+-commutative4.7%
distribute-rgt-out4.7%
+-commutative4.7%
fma-define4.7%
add-exp-log4.7%
Applied egg-rr4.7%
associate-*r/4.7%
*-rgt-identity4.7%
+-commutative4.7%
associate--l+91.9%
+-inverses91.9%
metadata-eval91.9%
+-commutative91.9%
exp-prod90.9%
Simplified90.9%
expm1-log1p-u91.0%
expm1-undefine91.0%
Applied egg-rr91.0%
expm1-define91.0%
Simplified91.0%
Taylor expanded in x around 0 20.0%
expm1-log1p-u20.0%
fma-undefine20.0%
+-commutative20.0%
+-commutative20.0%
Applied egg-rr20.0%
Final simplification59.7%
(FPCore (x)
:precision binary64
(if (<= x 1.35e+154)
(/
(+
(* (cbrt x) -0.1111111111111111)
(* 0.3333333333333333 (pow (cbrt x) 4.0)))
(pow x 2.0))
(/ 1.0 (+ 1.0 (* (cbrt x) (+ (cbrt x) (cbrt (+ 1.0 x))))))))
double code(double x) {
double tmp;
if (x <= 1.35e+154) {
tmp = ((cbrt(x) * -0.1111111111111111) + (0.3333333333333333 * pow(cbrt(x), 4.0))) / pow(x, 2.0);
} else {
tmp = 1.0 / (1.0 + (cbrt(x) * (cbrt(x) + cbrt((1.0 + x)))));
}
return tmp;
}
public static double code(double x) {
double tmp;
if (x <= 1.35e+154) {
tmp = ((Math.cbrt(x) * -0.1111111111111111) + (0.3333333333333333 * Math.pow(Math.cbrt(x), 4.0))) / Math.pow(x, 2.0);
} else {
tmp = 1.0 / (1.0 + (Math.cbrt(x) * (Math.cbrt(x) + Math.cbrt((1.0 + x)))));
}
return tmp;
}
function code(x) tmp = 0.0 if (x <= 1.35e+154) tmp = Float64(Float64(Float64(cbrt(x) * -0.1111111111111111) + Float64(0.3333333333333333 * (cbrt(x) ^ 4.0))) / (x ^ 2.0)); else tmp = Float64(1.0 / Float64(1.0 + Float64(cbrt(x) * Float64(cbrt(x) + cbrt(Float64(1.0 + x)))))); end return tmp end
code[x_] := If[LessEqual[x, 1.35e+154], N[(N[(N[(N[Power[x, 1/3], $MachinePrecision] * -0.1111111111111111), $MachinePrecision] + N[(0.3333333333333333 * N[Power[N[Power[x, 1/3], $MachinePrecision], 4.0], $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / N[Power[x, 2.0], $MachinePrecision]), $MachinePrecision], N[(1.0 / N[(1.0 + N[(N[Power[x, 1/3], $MachinePrecision] * N[(N[Power[x, 1/3], $MachinePrecision] + N[Power[N[(1.0 + x), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;x \leq 1.35 \cdot 10^{+154}:\\
\;\;\;\;\frac{\sqrt[3]{x} \cdot -0.1111111111111111 + 0.3333333333333333 \cdot {\left(\sqrt[3]{x}\right)}^{4}}{{x}^{2}}\\
\mathbf{else}:\\
\;\;\;\;\frac{1}{1 + \sqrt[3]{x} \cdot \left(\sqrt[3]{x} + \sqrt[3]{1 + x}\right)}\\
\end{array}
\end{array}
if x < 1.35000000000000003e154Initial program 7.2%
Taylor expanded in x around inf 43.9%
*-un-lft-identity43.9%
Applied egg-rr43.9%
*-lft-identity43.9%
unpow1/340.9%
exp-to-pow41.3%
exp-prod89.6%
associate-*l*89.6%
metadata-eval89.6%
exp-to-pow89.2%
metadata-eval89.2%
pow-plus92.1%
unpow1/397.8%
rem-3cbrt-rft96.6%
unpow296.6%
associate-*l*96.6%
unpow296.6%
pow-sqr96.6%
metadata-eval96.6%
Simplified96.6%
if 1.35000000000000003e154 < x Initial program 4.7%
flip3--4.7%
div-inv4.7%
rem-cube-cbrt3.2%
rem-cube-cbrt4.7%
+-commutative4.7%
distribute-rgt-out4.7%
+-commutative4.7%
fma-define4.7%
add-exp-log4.7%
Applied egg-rr4.7%
associate-*r/4.7%
*-rgt-identity4.7%
+-commutative4.7%
associate--l+92.0%
+-inverses92.0%
metadata-eval92.0%
+-commutative92.0%
exp-prod90.9%
Simplified90.9%
expm1-log1p-u91.0%
expm1-undefine91.0%
Applied egg-rr91.0%
expm1-define91.0%
Simplified91.0%
Taylor expanded in x around 0 20.0%
expm1-log1p-u20.0%
fma-undefine20.0%
+-commutative20.0%
+-commutative20.0%
Applied egg-rr20.0%
Final simplification58.6%
(FPCore (x) :precision binary64 (if (<= x 1.35e+154) (* 0.3333333333333333 (cbrt (/ 1.0 (pow x 2.0)))) (/ 1.0 (+ 1.0 (* (cbrt x) (+ (cbrt x) (cbrt (+ 1.0 x))))))))
double code(double x) {
double tmp;
if (x <= 1.35e+154) {
tmp = 0.3333333333333333 * cbrt((1.0 / pow(x, 2.0)));
} else {
tmp = 1.0 / (1.0 + (cbrt(x) * (cbrt(x) + cbrt((1.0 + x)))));
}
return tmp;
}
public static double code(double x) {
double tmp;
if (x <= 1.35e+154) {
tmp = 0.3333333333333333 * Math.cbrt((1.0 / Math.pow(x, 2.0)));
} else {
tmp = 1.0 / (1.0 + (Math.cbrt(x) * (Math.cbrt(x) + Math.cbrt((1.0 + x)))));
}
return tmp;
}
function code(x) tmp = 0.0 if (x <= 1.35e+154) tmp = Float64(0.3333333333333333 * cbrt(Float64(1.0 / (x ^ 2.0)))); else tmp = Float64(1.0 / Float64(1.0 + Float64(cbrt(x) * Float64(cbrt(x) + cbrt(Float64(1.0 + x)))))); end return tmp end
code[x_] := If[LessEqual[x, 1.35e+154], N[(0.3333333333333333 * N[Power[N[(1.0 / N[Power[x, 2.0], $MachinePrecision]), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision], N[(1.0 / N[(1.0 + N[(N[Power[x, 1/3], $MachinePrecision] * N[(N[Power[x, 1/3], $MachinePrecision] + N[Power[N[(1.0 + x), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;x \leq 1.35 \cdot 10^{+154}:\\
\;\;\;\;0.3333333333333333 \cdot \sqrt[3]{\frac{1}{{x}^{2}}}\\
\mathbf{else}:\\
\;\;\;\;\frac{1}{1 + \sqrt[3]{x} \cdot \left(\sqrt[3]{x} + \sqrt[3]{1 + x}\right)}\\
\end{array}
\end{array}
if x < 1.35000000000000003e154Initial program 7.2%
Taylor expanded in x around inf 96.4%
if 1.35000000000000003e154 < x Initial program 4.7%
flip3--4.7%
div-inv4.7%
rem-cube-cbrt3.2%
rem-cube-cbrt4.7%
+-commutative4.7%
distribute-rgt-out4.7%
+-commutative4.7%
fma-define4.7%
add-exp-log4.7%
Applied egg-rr4.7%
associate-*r/4.7%
*-rgt-identity4.7%
+-commutative4.7%
associate--l+92.0%
+-inverses92.0%
metadata-eval92.0%
+-commutative92.0%
exp-prod90.9%
Simplified90.9%
expm1-log1p-u91.0%
expm1-undefine91.0%
Applied egg-rr91.0%
expm1-define91.0%
Simplified91.0%
Taylor expanded in x around 0 20.0%
expm1-log1p-u20.0%
fma-undefine20.0%
+-commutative20.0%
+-commutative20.0%
Applied egg-rr20.0%
Final simplification58.5%
(FPCore (x) :precision binary64 (if (<= x 1.35e+154) (* 0.3333333333333333 (cbrt (/ 1.0 (pow x 2.0)))) (/ 1.0 (+ 1.0 (* (cbrt x) (+ 1.0 (cbrt x)))))))
double code(double x) {
double tmp;
if (x <= 1.35e+154) {
tmp = 0.3333333333333333 * cbrt((1.0 / pow(x, 2.0)));
} else {
tmp = 1.0 / (1.0 + (cbrt(x) * (1.0 + cbrt(x))));
}
return tmp;
}
public static double code(double x) {
double tmp;
if (x <= 1.35e+154) {
tmp = 0.3333333333333333 * Math.cbrt((1.0 / Math.pow(x, 2.0)));
} else {
tmp = 1.0 / (1.0 + (Math.cbrt(x) * (1.0 + Math.cbrt(x))));
}
return tmp;
}
function code(x) tmp = 0.0 if (x <= 1.35e+154) tmp = Float64(0.3333333333333333 * cbrt(Float64(1.0 / (x ^ 2.0)))); else tmp = Float64(1.0 / Float64(1.0 + Float64(cbrt(x) * Float64(1.0 + cbrt(x))))); end return tmp end
code[x_] := If[LessEqual[x, 1.35e+154], N[(0.3333333333333333 * N[Power[N[(1.0 / N[Power[x, 2.0], $MachinePrecision]), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision], N[(1.0 / N[(1.0 + N[(N[Power[x, 1/3], $MachinePrecision] * N[(1.0 + N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;x \leq 1.35 \cdot 10^{+154}:\\
\;\;\;\;0.3333333333333333 \cdot \sqrt[3]{\frac{1}{{x}^{2}}}\\
\mathbf{else}:\\
\;\;\;\;\frac{1}{1 + \sqrt[3]{x} \cdot \left(1 + \sqrt[3]{x}\right)}\\
\end{array}
\end{array}
if x < 1.35000000000000003e154Initial program 7.2%
Taylor expanded in x around inf 96.4%
if 1.35000000000000003e154 < x Initial program 4.7%
flip3--4.7%
div-inv4.7%
rem-cube-cbrt3.2%
rem-cube-cbrt4.7%
+-commutative4.7%
distribute-rgt-out4.7%
+-commutative4.7%
fma-define4.7%
add-exp-log4.7%
Applied egg-rr4.7%
associate-*r/4.7%
*-rgt-identity4.7%
+-commutative4.7%
associate--l+92.0%
+-inverses92.0%
metadata-eval92.0%
+-commutative92.0%
exp-prod90.9%
Simplified90.9%
expm1-log1p-u91.0%
expm1-undefine91.0%
Applied egg-rr91.0%
expm1-define91.0%
Simplified91.0%
Taylor expanded in x around 0 20.0%
Taylor expanded in x around 0 17.7%
Final simplification57.4%
(FPCore (x) :precision binary64 (* 0.3333333333333333 (cbrt (/ 1.0 (pow x 2.0)))))
double code(double x) {
return 0.3333333333333333 * cbrt((1.0 / pow(x, 2.0)));
}
public static double code(double x) {
return 0.3333333333333333 * Math.cbrt((1.0 / Math.pow(x, 2.0)));
}
function code(x) return Float64(0.3333333333333333 * cbrt(Float64(1.0 / (x ^ 2.0)))) end
code[x_] := N[(0.3333333333333333 * N[Power[N[(1.0 / N[Power[x, 2.0], $MachinePrecision]), $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
0.3333333333333333 \cdot \sqrt[3]{\frac{1}{{x}^{2}}}
\end{array}
Initial program 6.0%
Taylor expanded in x around inf 50.9%
Final simplification50.9%
(FPCore (x) :precision binary64 (- (cbrt (+ 1.0 x)) (cbrt x)))
double code(double x) {
return cbrt((1.0 + x)) - cbrt(x);
}
public static double code(double x) {
return Math.cbrt((1.0 + x)) - Math.cbrt(x);
}
function code(x) return Float64(cbrt(Float64(1.0 + x)) - cbrt(x)) end
code[x_] := N[(N[Power[N[(1.0 + x), $MachinePrecision], 1/3], $MachinePrecision] - N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\sqrt[3]{1 + x} - \sqrt[3]{x}
\end{array}
Initial program 6.0%
Final simplification6.0%
(FPCore (x) :precision binary64 (+ 1.0 (cbrt x)))
double code(double x) {
return 1.0 + cbrt(x);
}
public static double code(double x) {
return 1.0 + Math.cbrt(x);
}
function code(x) return Float64(1.0 + cbrt(x)) end
code[x_] := N[(1.0 + N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
1 + \sqrt[3]{x}
\end{array}
Initial program 6.0%
Taylor expanded in x around 0 1.8%
sub-neg1.8%
rem-square-sqrt0.0%
fabs-sqr0.0%
rem-square-sqrt5.3%
fabs-neg5.3%
unpow1/35.3%
metadata-eval5.3%
pow-sqr5.3%
fabs-sqr5.3%
pow-sqr5.3%
metadata-eval5.3%
unpow1/35.3%
Simplified5.3%
Final simplification5.3%
(FPCore (x) :precision binary64 (let* ((t_0 (cbrt (+ x 1.0)))) (/ 1.0 (+ (+ (* t_0 t_0) (* (cbrt x) t_0)) (* (cbrt x) (cbrt x))))))
double code(double x) {
double t_0 = cbrt((x + 1.0));
return 1.0 / (((t_0 * t_0) + (cbrt(x) * t_0)) + (cbrt(x) * cbrt(x)));
}
public static double code(double x) {
double t_0 = Math.cbrt((x + 1.0));
return 1.0 / (((t_0 * t_0) + (Math.cbrt(x) * t_0)) + (Math.cbrt(x) * Math.cbrt(x)));
}
function code(x) t_0 = cbrt(Float64(x + 1.0)) return Float64(1.0 / Float64(Float64(Float64(t_0 * t_0) + Float64(cbrt(x) * t_0)) + Float64(cbrt(x) * cbrt(x)))) end
code[x_] := Block[{t$95$0 = N[Power[N[(x + 1.0), $MachinePrecision], 1/3], $MachinePrecision]}, N[(1.0 / N[(N[(N[(t$95$0 * t$95$0), $MachinePrecision] + N[(N[Power[x, 1/3], $MachinePrecision] * t$95$0), $MachinePrecision]), $MachinePrecision] + N[(N[Power[x, 1/3], $MachinePrecision] * N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
t_0 := \sqrt[3]{x + 1}\\
\frac{1}{\left(t\_0 \cdot t\_0 + \sqrt[3]{x} \cdot t\_0\right) + \sqrt[3]{x} \cdot \sqrt[3]{x}}
\end{array}
\end{array}
herbie shell --seed 2024096
(FPCore (x)
:name "2cbrt (problem 3.3.4)"
:precision binary64
:pre (and (> x 1.0) (< x 1e+308))
:alt
(/ 1.0 (+ (+ (* (cbrt (+ x 1.0)) (cbrt (+ x 1.0))) (* (cbrt x) (cbrt (+ x 1.0)))) (* (cbrt x) (cbrt x))))
(- (cbrt (+ x 1.0)) (cbrt x)))