
(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 13 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 (sqrt (+ 1.0 x)))) (t_1 (cbrt (+ 1.0 x)))) (/ 1.0 (fma (cbrt x) (+ (cbrt x) (* t_0 t_0)) (* t_1 t_1)))))
double code(double x) {
double t_0 = cbrt(sqrt((1.0 + x)));
double t_1 = cbrt((1.0 + x));
return 1.0 / fma(cbrt(x), (cbrt(x) + (t_0 * t_0)), (t_1 * t_1));
}
function code(x) t_0 = cbrt(sqrt(Float64(1.0 + x))) t_1 = cbrt(Float64(1.0 + x)) return Float64(1.0 / fma(cbrt(x), Float64(cbrt(x) + Float64(t_0 * t_0)), Float64(t_1 * t_1))) end
code[x_] := Block[{t$95$0 = N[Power[N[Sqrt[N[(1.0 + x), $MachinePrecision]], $MachinePrecision], 1/3], $MachinePrecision]}, Block[{t$95$1 = 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] + N[(t$95$0 * t$95$0), $MachinePrecision]), $MachinePrecision] + N[(t$95$1 * t$95$1), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]]
\begin{array}{l}
\\
\begin{array}{l}
t_0 := \sqrt[3]{\sqrt{1 + x}}\\
t_1 := \sqrt[3]{1 + x}\\
\frac{1}{\mathsf{fma}\left(\sqrt[3]{x}, \sqrt[3]{x} + t\_0 \cdot t\_0, t\_1 \cdot t\_1\right)}
\end{array}
\end{array}
Initial program 7.4%
flip3--7.6%
div-inv7.6%
rem-cube-cbrt6.6%
rem-cube-cbrt8.6%
+-commutative8.6%
distribute-rgt-out8.6%
+-commutative8.6%
fma-define8.6%
add-exp-log8.6%
Applied egg-rr8.6%
associate-*r/8.6%
*-rgt-identity8.6%
+-commutative8.6%
associate--l+93.2%
+-inverses93.2%
metadata-eval93.2%
+-commutative93.2%
exp-prod92.4%
Simplified92.4%
add-sqr-sqrt92.4%
unpow-prod-down93.9%
Applied egg-rr93.9%
pow-sqr93.9%
Simplified93.9%
sqr-pow93.9%
pow293.9%
pow-to-exp93.2%
*-commutative93.2%
associate-/l*93.2%
metadata-eval93.2%
*-commutative93.2%
*-un-lft-identity93.2%
pow1/293.2%
log-pow93.2%
rem-log-exp93.2%
metadata-eval93.2%
log1p-undefine93.2%
+-commutative93.2%
log-pow93.7%
pow1/394.3%
add-exp-log98.4%
pow298.4%
Applied egg-rr98.4%
pow1/394.5%
+-commutative94.5%
add-sqr-sqrt94.5%
unpow-prod-down94.5%
Applied egg-rr94.5%
unpow1/395.8%
+-commutative95.8%
unpow1/398.6%
+-commutative98.6%
Simplified98.6%
Final simplification98.6%
(FPCore (x) :precision binary64 (let* ((t_0 (cbrt (+ 1.0 x)))) (/ 1.0 (fma (cbrt x) (+ (cbrt x) t_0) (pow t_0 2.0)))))
double code(double x) {
double t_0 = cbrt((1.0 + x));
return 1.0 / fma(cbrt(x), (cbrt(x) + t_0), pow(t_0, 2.0));
}
function code(x) t_0 = cbrt(Float64(1.0 + x)) return Float64(1.0 / fma(cbrt(x), Float64(cbrt(x) + t_0), (t_0 ^ 2.0))) 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[Power[t$95$0, 2.0], $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}^{2}\right)}
\end{array}
\end{array}
Initial program 7.4%
flip3--7.6%
div-inv7.6%
rem-cube-cbrt6.6%
rem-cube-cbrt8.6%
+-commutative8.6%
distribute-rgt-out8.6%
+-commutative8.6%
fma-define8.6%
add-exp-log8.6%
Applied egg-rr8.6%
associate-*r/8.6%
*-rgt-identity8.6%
+-commutative8.6%
associate--l+93.2%
+-inverses93.2%
metadata-eval93.2%
+-commutative93.2%
exp-prod92.4%
Simplified92.4%
add-sqr-sqrt92.4%
unpow-prod-down93.9%
Applied egg-rr93.9%
pow-sqr93.9%
Simplified93.9%
sqr-pow93.9%
pow293.9%
pow-to-exp93.2%
*-commutative93.2%
associate-/l*93.2%
metadata-eval93.2%
*-commutative93.2%
*-un-lft-identity93.2%
pow1/293.2%
log-pow93.2%
rem-log-exp93.2%
metadata-eval93.2%
log1p-undefine93.2%
+-commutative93.2%
log-pow93.7%
pow1/394.3%
add-exp-log98.4%
pow298.4%
Applied egg-rr98.4%
pow298.4%
Applied egg-rr98.4%
Final simplification98.4%
(FPCore (x)
:precision binary64
(if (<= x 6e+17)
(/
1.0
(fma
(cbrt x)
(+ (cbrt x) (cbrt (+ 1.0 x)))
(pow (+ 1.0 x) 0.6666666666666666)))
(pow (/ (sqrt 0.3333333333333333) (cbrt x)) 2.0)))
double code(double x) {
double tmp;
if (x <= 6e+17) {
tmp = 1.0 / fma(cbrt(x), (cbrt(x) + cbrt((1.0 + x))), pow((1.0 + x), 0.6666666666666666));
} else {
tmp = pow((sqrt(0.3333333333333333) / cbrt(x)), 2.0);
}
return tmp;
}
function code(x) tmp = 0.0 if (x <= 6e+17) tmp = Float64(1.0 / fma(cbrt(x), Float64(cbrt(x) + cbrt(Float64(1.0 + x))), (Float64(1.0 + x) ^ 0.6666666666666666))); else tmp = Float64(sqrt(0.3333333333333333) / cbrt(x)) ^ 2.0; end return tmp end
code[x_] := If[LessEqual[x, 6e+17], 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[Power[N[(1.0 + x), $MachinePrecision], 0.6666666666666666], $MachinePrecision]), $MachinePrecision]), $MachinePrecision], N[Power[N[(N[Sqrt[0.3333333333333333], $MachinePrecision] / N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision], 2.0], $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;x \leq 6 \cdot 10^{+17}:\\
\;\;\;\;\frac{1}{\mathsf{fma}\left(\sqrt[3]{x}, \sqrt[3]{x} + \sqrt[3]{1 + x}, {\left(1 + x\right)}^{0.6666666666666666}\right)}\\
\mathbf{else}:\\
\;\;\;\;{\left(\frac{\sqrt{0.3333333333333333}}{\sqrt[3]{x}}\right)}^{2}\\
\end{array}
\end{array}
if x < 6e17Initial program 62.0%
flip3--66.0%
div-inv66.0%
rem-cube-cbrt64.5%
rem-cube-cbrt84.6%
+-commutative84.6%
distribute-rgt-out84.5%
+-commutative84.5%
fma-define84.5%
add-exp-log84.3%
Applied egg-rr84.3%
associate-*r/84.3%
*-rgt-identity84.3%
+-commutative84.3%
associate--l+97.9%
+-inverses97.9%
metadata-eval97.9%
+-commutative97.9%
exp-prod98.1%
Simplified98.1%
add-sqr-sqrt98.1%
unpow-prod-down98.6%
Applied egg-rr98.6%
pow-sqr98.6%
Simplified98.6%
sqr-pow98.6%
pow298.6%
pow-to-exp98.1%
*-commutative98.1%
associate-/l*98.1%
metadata-eval98.1%
*-commutative98.1%
*-un-lft-identity98.1%
pow1/298.1%
log-pow98.1%
rem-log-exp98.1%
metadata-eval98.1%
log1p-undefine98.1%
+-commutative98.1%
log-pow98.5%
pow1/398.1%
add-exp-log98.3%
pow298.3%
Applied egg-rr98.3%
pow298.3%
pow1/398.6%
+-commutative98.6%
pow-pow98.7%
+-commutative98.7%
metadata-eval98.7%
Applied egg-rr98.7%
if 6e17 < x Initial program 4.2%
Taylor expanded in x around inf 22.7%
+-commutative22.7%
fma-define22.7%
Simplified22.7%
add-sqr-sqrt22.6%
pow222.6%
sqrt-div22.6%
*-commutative22.6%
sqrt-pow123.8%
metadata-eval23.8%
pow123.8%
Applied egg-rr23.8%
Taylor expanded in x around inf 45.9%
unpow245.9%
associate-/l*45.9%
associate-*l*46.0%
unpow246.0%
cbrt-prod46.0%
pow246.0%
associate-/l*45.9%
unpow245.9%
cbrt-prod73.7%
pow273.7%
Applied egg-rr73.7%
associate-*r*97.6%
unpow297.6%
associate-*r/97.7%
rem-3cbrt-lft98.0%
unpow298.0%
associate-/l/98.0%
associate-/l*98.2%
associate-*l/98.2%
*-inverses98.2%
*-lft-identity98.2%
Simplified98.2%
Final simplification98.2%
(FPCore (x)
:precision binary64
(let* ((t_0 (pow (+ 1.0 x) 0.16666666666666666)))
(if (<= x 66000000.0)
(*
(+ t_0 (pow x 0.16666666666666666))
(- t_0 (pow x 0.16666666666666666)))
(pow (/ (sqrt 0.3333333333333333) (cbrt x)) 2.0))))
double code(double x) {
double t_0 = pow((1.0 + x), 0.16666666666666666);
double tmp;
if (x <= 66000000.0) {
tmp = (t_0 + pow(x, 0.16666666666666666)) * (t_0 - pow(x, 0.16666666666666666));
} else {
tmp = pow((sqrt(0.3333333333333333) / cbrt(x)), 2.0);
}
return tmp;
}
public static double code(double x) {
double t_0 = Math.pow((1.0 + x), 0.16666666666666666);
double tmp;
if (x <= 66000000.0) {
tmp = (t_0 + Math.pow(x, 0.16666666666666666)) * (t_0 - Math.pow(x, 0.16666666666666666));
} else {
tmp = Math.pow((Math.sqrt(0.3333333333333333) / Math.cbrt(x)), 2.0);
}
return tmp;
}
function code(x) t_0 = Float64(1.0 + x) ^ 0.16666666666666666 tmp = 0.0 if (x <= 66000000.0) tmp = Float64(Float64(t_0 + (x ^ 0.16666666666666666)) * Float64(t_0 - (x ^ 0.16666666666666666))); else tmp = Float64(sqrt(0.3333333333333333) / cbrt(x)) ^ 2.0; end return tmp end
code[x_] := Block[{t$95$0 = N[Power[N[(1.0 + x), $MachinePrecision], 0.16666666666666666], $MachinePrecision]}, If[LessEqual[x, 66000000.0], N[(N[(t$95$0 + N[Power[x, 0.16666666666666666], $MachinePrecision]), $MachinePrecision] * N[(t$95$0 - N[Power[x, 0.16666666666666666], $MachinePrecision]), $MachinePrecision]), $MachinePrecision], N[Power[N[(N[Sqrt[0.3333333333333333], $MachinePrecision] / N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision], 2.0], $MachinePrecision]]]
\begin{array}{l}
\\
\begin{array}{l}
t_0 := {\left(1 + x\right)}^{0.16666666666666666}\\
\mathbf{if}\;x \leq 66000000:\\
\;\;\;\;\left(t\_0 + {x}^{0.16666666666666666}\right) \cdot \left(t\_0 - {x}^{0.16666666666666666}\right)\\
\mathbf{else}:\\
\;\;\;\;{\left(\frac{\sqrt{0.3333333333333333}}{\sqrt[3]{x}}\right)}^{2}\\
\end{array}
\end{array}
if x < 6.6e7Initial program 81.6%
add-sqr-sqrt80.9%
add-sqr-sqrt79.7%
difference-of-squares80.9%
pow1/380.9%
sqrt-pow180.9%
metadata-eval80.9%
pow1/380.9%
sqrt-pow180.9%
metadata-eval80.9%
pow1/379.9%
sqrt-pow180.4%
metadata-eval80.4%
pow1/382.8%
sqrt-pow183.2%
metadata-eval83.2%
Applied egg-rr83.2%
if 6.6e7 < x Initial program 4.7%
Taylor expanded in x around inf 24.2%
+-commutative24.2%
fma-define24.2%
Simplified24.2%
add-sqr-sqrt24.1%
pow224.1%
sqrt-div24.2%
*-commutative24.2%
sqrt-pow125.3%
metadata-eval25.3%
pow125.3%
Applied egg-rr25.3%
Taylor expanded in x around inf 46.8%
unpow246.8%
associate-/l*46.8%
associate-*l*46.8%
unpow246.8%
cbrt-prod46.8%
pow246.8%
associate-/l*46.7%
unpow246.7%
cbrt-prod74.0%
pow274.0%
Applied egg-rr74.0%
associate-*r*97.4%
unpow297.4%
associate-*r/97.5%
rem-3cbrt-lft97.8%
unpow297.8%
associate-/l/97.8%
associate-/l*97.9%
associate-*l/97.9%
*-inverses97.9%
*-lft-identity97.9%
Simplified97.9%
Final simplification97.4%
(FPCore (x)
:precision binary64
(if (<= x 37000000.0)
(fma
(pow x 0.16666666666666666)
(- (pow x 0.16666666666666666))
(pow (+ 1.0 x) 0.3333333333333333))
(pow (/ (sqrt 0.3333333333333333) (cbrt x)) 2.0)))
double code(double x) {
double tmp;
if (x <= 37000000.0) {
tmp = fma(pow(x, 0.16666666666666666), -pow(x, 0.16666666666666666), pow((1.0 + x), 0.3333333333333333));
} else {
tmp = pow((sqrt(0.3333333333333333) / cbrt(x)), 2.0);
}
return tmp;
}
function code(x) tmp = 0.0 if (x <= 37000000.0) tmp = fma((x ^ 0.16666666666666666), Float64(-(x ^ 0.16666666666666666)), (Float64(1.0 + x) ^ 0.3333333333333333)); else tmp = Float64(sqrt(0.3333333333333333) / cbrt(x)) ^ 2.0; end return tmp end
code[x_] := If[LessEqual[x, 37000000.0], N[(N[Power[x, 0.16666666666666666], $MachinePrecision] * (-N[Power[x, 0.16666666666666666], $MachinePrecision]) + N[Power[N[(1.0 + x), $MachinePrecision], 0.3333333333333333], $MachinePrecision]), $MachinePrecision], N[Power[N[(N[Sqrt[0.3333333333333333], $MachinePrecision] / N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision], 2.0], $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;x \leq 37000000:\\
\;\;\;\;\mathsf{fma}\left({x}^{0.16666666666666666}, -{x}^{0.16666666666666666}, {\left(1 + x\right)}^{0.3333333333333333}\right)\\
\mathbf{else}:\\
\;\;\;\;{\left(\frac{\sqrt{0.3333333333333333}}{\sqrt[3]{x}}\right)}^{2}\\
\end{array}
\end{array}
if x < 3.7e7Initial program 84.5%
sub-neg84.5%
+-commutative84.5%
add-sqr-sqrt83.0%
distribute-rgt-neg-in83.0%
fma-define83.8%
pow1/383.5%
sqrt-pow183.6%
metadata-eval83.6%
pow1/382.3%
sqrt-pow182.5%
metadata-eval82.5%
Applied egg-rr82.5%
pow1/385.8%
Applied egg-rr85.8%
if 3.7e7 < x Initial program 4.9%
Taylor expanded in x around inf 24.5%
+-commutative24.5%
fma-define24.5%
Simplified24.5%
add-sqr-sqrt24.4%
pow224.4%
sqrt-div24.5%
*-commutative24.5%
sqrt-pow125.6%
metadata-eval25.6%
pow125.6%
Applied egg-rr25.6%
Taylor expanded in x around inf 46.8%
unpow246.8%
associate-/l*46.8%
associate-*l*46.9%
unpow246.9%
cbrt-prod46.9%
pow246.9%
associate-/l*46.8%
unpow246.8%
cbrt-prod73.9%
pow273.9%
Applied egg-rr73.9%
associate-*r*97.2%
unpow297.2%
associate-*r/97.3%
rem-3cbrt-lft97.6%
unpow297.6%
associate-/l/97.6%
associate-/l*97.8%
associate-*l/97.8%
*-inverses97.8%
*-lft-identity97.8%
Simplified97.8%
Final simplification97.4%
(FPCore (x) :precision binary64 (if (<= x 30000000.0) (log (exp (- (cbrt (+ 1.0 x)) (cbrt x)))) (pow (/ (sqrt 0.3333333333333333) (cbrt x)) 2.0)))
double code(double x) {
double tmp;
if (x <= 30000000.0) {
tmp = log(exp((cbrt((1.0 + x)) - cbrt(x))));
} else {
tmp = pow((sqrt(0.3333333333333333) / cbrt(x)), 2.0);
}
return tmp;
}
public static double code(double x) {
double tmp;
if (x <= 30000000.0) {
tmp = Math.log(Math.exp((Math.cbrt((1.0 + x)) - Math.cbrt(x))));
} else {
tmp = Math.pow((Math.sqrt(0.3333333333333333) / Math.cbrt(x)), 2.0);
}
return tmp;
}
function code(x) tmp = 0.0 if (x <= 30000000.0) tmp = log(exp(Float64(cbrt(Float64(1.0 + x)) - cbrt(x)))); else tmp = Float64(sqrt(0.3333333333333333) / cbrt(x)) ^ 2.0; end return tmp end
code[x_] := If[LessEqual[x, 30000000.0], N[Log[N[Exp[N[(N[Power[N[(1.0 + x), $MachinePrecision], 1/3], $MachinePrecision] - N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision]], $MachinePrecision]], $MachinePrecision], N[Power[N[(N[Sqrt[0.3333333333333333], $MachinePrecision] / N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision], 2.0], $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;x \leq 30000000:\\
\;\;\;\;\log \left(e^{\sqrt[3]{1 + x} - \sqrt[3]{x}}\right)\\
\mathbf{else}:\\
\;\;\;\;{\left(\frac{\sqrt{0.3333333333333333}}{\sqrt[3]{x}}\right)}^{2}\\
\end{array}
\end{array}
if x < 3e7Initial program 84.5%
add-log-exp84.8%
Applied egg-rr84.8%
if 3e7 < x Initial program 4.9%
Taylor expanded in x around inf 24.5%
+-commutative24.5%
fma-define24.5%
Simplified24.5%
add-sqr-sqrt24.4%
pow224.4%
sqrt-div24.5%
*-commutative24.5%
sqrt-pow125.6%
metadata-eval25.6%
pow125.6%
Applied egg-rr25.6%
Taylor expanded in x around inf 46.8%
unpow246.8%
associate-/l*46.8%
associate-*l*46.9%
unpow246.9%
cbrt-prod46.9%
pow246.9%
associate-/l*46.8%
unpow246.8%
cbrt-prod73.9%
pow273.9%
Applied egg-rr73.9%
associate-*r*97.2%
unpow297.2%
associate-*r/97.3%
rem-3cbrt-lft97.6%
unpow297.6%
associate-/l/97.6%
associate-/l*97.8%
associate-*l/97.8%
*-inverses97.8%
*-lft-identity97.8%
Simplified97.8%
Final simplification97.4%
(FPCore (x) :precision binary64 (pow (/ (sqrt 0.3333333333333333) (cbrt x)) 2.0))
double code(double x) {
return pow((sqrt(0.3333333333333333) / cbrt(x)), 2.0);
}
public static double code(double x) {
return Math.pow((Math.sqrt(0.3333333333333333) / Math.cbrt(x)), 2.0);
}
function code(x) return Float64(sqrt(0.3333333333333333) / cbrt(x)) ^ 2.0 end
code[x_] := N[Power[N[(N[Sqrt[0.3333333333333333], $MachinePrecision] / N[Power[x, 1/3], $MachinePrecision]), $MachinePrecision], 2.0], $MachinePrecision]
\begin{array}{l}
\\
{\left(\frac{\sqrt{0.3333333333333333}}{\sqrt[3]{x}}\right)}^{2}
\end{array}
Initial program 7.4%
Taylor expanded in x around inf 25.3%
+-commutative25.3%
fma-define25.3%
Simplified25.3%
add-sqr-sqrt25.3%
pow225.3%
sqrt-div25.3%
*-commutative25.3%
sqrt-pow126.4%
metadata-eval26.4%
pow126.4%
Applied egg-rr26.4%
Taylor expanded in x around inf 46.5%
unpow246.5%
associate-/l*46.5%
associate-*l*46.5%
unpow246.5%
cbrt-prod46.5%
pow246.5%
associate-/l*46.4%
unpow246.4%
cbrt-prod72.7%
pow272.7%
Applied egg-rr72.7%
associate-*r*95.3%
unpow295.3%
associate-*r/95.4%
rem-3cbrt-lft95.7%
unpow295.7%
associate-/l/95.7%
associate-/l*95.8%
associate-*l/95.8%
*-inverses95.8%
*-lft-identity95.8%
Simplified95.8%
Final simplification95.8%
(FPCore (x) :precision binary64 (if (<= x 6.4e+161) (* 0.3333333333333333 (cbrt (pow (/ 1.0 x) 2.0))) (/ 1.0 (* 2.0 (pow (cbrt x) 2.0)))))
double code(double x) {
double tmp;
if (x <= 6.4e+161) {
tmp = 0.3333333333333333 * cbrt(pow((1.0 / x), 2.0));
} else {
tmp = 1.0 / (2.0 * pow(cbrt(x), 2.0));
}
return tmp;
}
public static double code(double x) {
double tmp;
if (x <= 6.4e+161) {
tmp = 0.3333333333333333 * Math.cbrt(Math.pow((1.0 / x), 2.0));
} else {
tmp = 1.0 / (2.0 * Math.pow(Math.cbrt(x), 2.0));
}
return tmp;
}
function code(x) tmp = 0.0 if (x <= 6.4e+161) tmp = Float64(0.3333333333333333 * cbrt((Float64(1.0 / x) ^ 2.0))); else tmp = Float64(1.0 / Float64(2.0 * (cbrt(x) ^ 2.0))); end return tmp end
code[x_] := If[LessEqual[x, 6.4e+161], N[(0.3333333333333333 * N[Power[N[Power[N[(1.0 / x), $MachinePrecision], 2.0], $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision], N[(1.0 / N[(2.0 * N[Power[N[Power[x, 1/3], $MachinePrecision], 2.0], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;x \leq 6.4 \cdot 10^{+161}:\\
\;\;\;\;0.3333333333333333 \cdot \sqrt[3]{{\left(\frac{1}{x}\right)}^{2}}\\
\mathbf{else}:\\
\;\;\;\;\frac{1}{2 \cdot {\left(\sqrt[3]{x}\right)}^{2}}\\
\end{array}
\end{array}
if x < 6.40000000000000004e161Initial program 10.1%
Taylor expanded in x around inf 51.1%
+-commutative51.1%
fma-define51.1%
Simplified51.1%
add-sqr-sqrt50.9%
pow250.9%
sqrt-div51.0%
*-commutative51.0%
sqrt-pow151.0%
metadata-eval51.0%
pow151.0%
Applied egg-rr51.0%
Taylor expanded in x around inf 91.6%
*-commutative91.6%
unpow291.6%
associate-/r*93.5%
*-rgt-identity93.5%
associate-*r/93.5%
unpow293.5%
Simplified93.5%
if 6.40000000000000004e161 < x Initial program 4.8%
flip3--4.8%
div-inv4.8%
rem-cube-cbrt3.1%
rem-cube-cbrt4.8%
+-commutative4.8%
distribute-rgt-out4.8%
+-commutative4.8%
fma-define4.8%
add-exp-log4.8%
Applied egg-rr4.8%
associate-*r/4.8%
*-rgt-identity4.8%
+-commutative4.8%
associate--l+91.8%
+-inverses91.8%
metadata-eval91.8%
+-commutative91.8%
exp-prod91.1%
Simplified91.1%
expm1-log1p-u90.8%
expm1-undefine90.8%
Applied egg-rr90.8%
expm1-define90.8%
Simplified90.8%
Taylor expanded in x around 0 19.9%
Taylor expanded in x around inf 4.8%
unpow24.8%
rem-cube-cbrt4.8%
rem-cube-cbrt4.8%
cube-prod4.8%
unpow24.8%
rem-cbrt-cube19.9%
Simplified19.9%
Final simplification56.4%
(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 7.4%
Taylor expanded in x around inf 47.9%
Final simplification47.9%
(FPCore (x) :precision binary64 (* 0.3333333333333333 (cbrt (pow (/ 1.0 x) 2.0))))
double code(double x) {
return 0.3333333333333333 * cbrt(pow((1.0 / x), 2.0));
}
public static double code(double x) {
return 0.3333333333333333 * Math.cbrt(Math.pow((1.0 / 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[Power[N[(1.0 / x), $MachinePrecision], 2.0], $MachinePrecision], 1/3], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
0.3333333333333333 \cdot \sqrt[3]{{\left(\frac{1}{x}\right)}^{2}}
\end{array}
Initial program 7.4%
Taylor expanded in x around inf 25.3%
+-commutative25.3%
fma-define25.3%
Simplified25.3%
add-sqr-sqrt25.3%
pow225.3%
sqrt-div25.3%
*-commutative25.3%
sqrt-pow126.4%
metadata-eval26.4%
pow126.4%
Applied egg-rr26.4%
Taylor expanded in x around inf 47.9%
*-commutative47.9%
unpow247.9%
associate-/r*48.8%
*-rgt-identity48.8%
associate-*r/48.8%
unpow248.8%
Simplified48.8%
Final simplification48.8%
(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 7.4%
Final simplification7.4%
(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 7.4%
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 0.0)
double code(double x) {
return 0.0;
}
real(8) function code(x)
real(8), intent (in) :: x
code = 0.0d0
end function
public static double code(double x) {
return 0.0;
}
def code(x): return 0.0
function code(x) return 0.0 end
function tmp = code(x) tmp = 0.0; end
code[x_] := 0.0
\begin{array}{l}
\\
0
\end{array}
Initial program 7.4%
sub-neg7.4%
+-commutative7.4%
add-sqr-sqrt6.8%
distribute-rgt-neg-in6.8%
fma-define6.4%
pow1/38.5%
sqrt-pow18.5%
metadata-eval8.5%
pow1/38.4%
sqrt-pow18.4%
metadata-eval8.4%
Applied egg-rr8.4%
Taylor expanded in x around inf 4.2%
distribute-rgt1-in4.2%
metadata-eval4.2%
mul0-lft4.2%
mul0-rgt4.2%
Simplified4.2%
Final simplification4.2%
(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 2024085
(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)))