
(FPCore (a rand) :precision binary64 (let* ((t_0 (- a (/ 1.0 3.0)))) (* t_0 (+ 1.0 (* (/ 1.0 (sqrt (* 9.0 t_0))) rand)))))
double code(double a, double rand) {
double t_0 = a - (1.0 / 3.0);
return t_0 * (1.0 + ((1.0 / sqrt((9.0 * t_0))) * rand));
}
real(8) function code(a, rand)
real(8), intent (in) :: a
real(8), intent (in) :: rand
real(8) :: t_0
t_0 = a - (1.0d0 / 3.0d0)
code = t_0 * (1.0d0 + ((1.0d0 / sqrt((9.0d0 * t_0))) * rand))
end function
public static double code(double a, double rand) {
double t_0 = a - (1.0 / 3.0);
return t_0 * (1.0 + ((1.0 / Math.sqrt((9.0 * t_0))) * rand));
}
def code(a, rand): t_0 = a - (1.0 / 3.0) return t_0 * (1.0 + ((1.0 / math.sqrt((9.0 * t_0))) * rand))
function code(a, rand) t_0 = Float64(a - Float64(1.0 / 3.0)) return Float64(t_0 * Float64(1.0 + Float64(Float64(1.0 / sqrt(Float64(9.0 * t_0))) * rand))) end
function tmp = code(a, rand) t_0 = a - (1.0 / 3.0); tmp = t_0 * (1.0 + ((1.0 / sqrt((9.0 * t_0))) * rand)); end
code[a_, rand_] := Block[{t$95$0 = N[(a - N[(1.0 / 3.0), $MachinePrecision]), $MachinePrecision]}, N[(t$95$0 * N[(1.0 + N[(N[(1.0 / N[Sqrt[N[(9.0 * t$95$0), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] * rand), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
t_0 := a - \frac{1}{3}\\
t_0 \cdot \left(1 + \frac{1}{\sqrt{9 \cdot t_0}} \cdot rand\right)
\end{array}
\end{array}
Sampling outcomes in binary64 precision:
Herbie found 6 alternatives:
| Alternative | Accuracy | Speedup |
|---|
(FPCore (a rand) :precision binary64 (let* ((t_0 (- a (/ 1.0 3.0)))) (* t_0 (+ 1.0 (* (/ 1.0 (sqrt (* 9.0 t_0))) rand)))))
double code(double a, double rand) {
double t_0 = a - (1.0 / 3.0);
return t_0 * (1.0 + ((1.0 / sqrt((9.0 * t_0))) * rand));
}
real(8) function code(a, rand)
real(8), intent (in) :: a
real(8), intent (in) :: rand
real(8) :: t_0
t_0 = a - (1.0d0 / 3.0d0)
code = t_0 * (1.0d0 + ((1.0d0 / sqrt((9.0d0 * t_0))) * rand))
end function
public static double code(double a, double rand) {
double t_0 = a - (1.0 / 3.0);
return t_0 * (1.0 + ((1.0 / Math.sqrt((9.0 * t_0))) * rand));
}
def code(a, rand): t_0 = a - (1.0 / 3.0) return t_0 * (1.0 + ((1.0 / math.sqrt((9.0 * t_0))) * rand))
function code(a, rand) t_0 = Float64(a - Float64(1.0 / 3.0)) return Float64(t_0 * Float64(1.0 + Float64(Float64(1.0 / sqrt(Float64(9.0 * t_0))) * rand))) end
function tmp = code(a, rand) t_0 = a - (1.0 / 3.0); tmp = t_0 * (1.0 + ((1.0 / sqrt((9.0 * t_0))) * rand)); end
code[a_, rand_] := Block[{t$95$0 = N[(a - N[(1.0 / 3.0), $MachinePrecision]), $MachinePrecision]}, N[(t$95$0 * N[(1.0 + N[(N[(1.0 / N[Sqrt[N[(9.0 * t$95$0), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] * rand), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
t_0 := a - \frac{1}{3}\\
t_0 \cdot \left(1 + \frac{1}{\sqrt{9 \cdot t_0}} \cdot rand\right)
\end{array}
\end{array}
(FPCore (a rand) :precision binary64 (- (+ a (* rand (sqrt (+ -0.037037037037037035 (* a 0.1111111111111111))))) 0.3333333333333333))
double code(double a, double rand) {
return (a + (rand * sqrt((-0.037037037037037035 + (a * 0.1111111111111111))))) - 0.3333333333333333;
}
real(8) function code(a, rand)
real(8), intent (in) :: a
real(8), intent (in) :: rand
code = (a + (rand * sqrt(((-0.037037037037037035d0) + (a * 0.1111111111111111d0))))) - 0.3333333333333333d0
end function
public static double code(double a, double rand) {
return (a + (rand * Math.sqrt((-0.037037037037037035 + (a * 0.1111111111111111))))) - 0.3333333333333333;
}
def code(a, rand): return (a + (rand * math.sqrt((-0.037037037037037035 + (a * 0.1111111111111111))))) - 0.3333333333333333
function code(a, rand) return Float64(Float64(a + Float64(rand * sqrt(Float64(-0.037037037037037035 + Float64(a * 0.1111111111111111))))) - 0.3333333333333333) end
function tmp = code(a, rand) tmp = (a + (rand * sqrt((-0.037037037037037035 + (a * 0.1111111111111111))))) - 0.3333333333333333; end
code[a_, rand_] := N[(N[(a + N[(rand * N[Sqrt[N[(-0.037037037037037035 + N[(a * 0.1111111111111111), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]), $MachinePrecision] - 0.3333333333333333), $MachinePrecision]
\begin{array}{l}
\\
\left(a + rand \cdot \sqrt{-0.037037037037037035 + a \cdot 0.1111111111111111}\right) - 0.3333333333333333
\end{array}
Initial program 99.5%
sub-neg99.5%
metadata-eval99.5%
metadata-eval99.5%
*-commutative99.5%
sub-neg99.5%
metadata-eval99.5%
metadata-eval99.5%
Simplified99.5%
Applied egg-rr99.8%
remove-double-neg99.8%
distribute-rgt-neg-in99.8%
metadata-eval99.8%
*-commutative99.8%
associate-/r*99.8%
+-commutative99.8%
Simplified99.8%
Taylor expanded in rand around 0 99.8%
expm1-log1p-u63.3%
expm1-udef63.3%
*-commutative63.3%
sub-neg63.3%
metadata-eval63.3%
associate-*r*63.3%
add-sqr-sqrt63.3%
sqrt-unprod63.3%
swap-sqr63.3%
add-sqr-sqrt63.3%
metadata-eval63.3%
Applied egg-rr63.3%
expm1-def63.3%
expm1-log1p99.9%
*-commutative99.9%
+-commutative99.9%
distribute-lft-in99.9%
metadata-eval99.9%
Simplified99.9%
Final simplification99.9%
(FPCore (a rand) :precision binary64 (if (or (<= rand -1.02e+70) (not (<= rand 7.4e+96))) (* 0.3333333333333333 (* rand (sqrt (- a 0.3333333333333333)))) (- a 0.3333333333333333)))
double code(double a, double rand) {
double tmp;
if ((rand <= -1.02e+70) || !(rand <= 7.4e+96)) {
tmp = 0.3333333333333333 * (rand * sqrt((a - 0.3333333333333333)));
} else {
tmp = a - 0.3333333333333333;
}
return tmp;
}
real(8) function code(a, rand)
real(8), intent (in) :: a
real(8), intent (in) :: rand
real(8) :: tmp
if ((rand <= (-1.02d+70)) .or. (.not. (rand <= 7.4d+96))) then
tmp = 0.3333333333333333d0 * (rand * sqrt((a - 0.3333333333333333d0)))
else
tmp = a - 0.3333333333333333d0
end if
code = tmp
end function
public static double code(double a, double rand) {
double tmp;
if ((rand <= -1.02e+70) || !(rand <= 7.4e+96)) {
tmp = 0.3333333333333333 * (rand * Math.sqrt((a - 0.3333333333333333)));
} else {
tmp = a - 0.3333333333333333;
}
return tmp;
}
def code(a, rand): tmp = 0 if (rand <= -1.02e+70) or not (rand <= 7.4e+96): tmp = 0.3333333333333333 * (rand * math.sqrt((a - 0.3333333333333333))) else: tmp = a - 0.3333333333333333 return tmp
function code(a, rand) tmp = 0.0 if ((rand <= -1.02e+70) || !(rand <= 7.4e+96)) tmp = Float64(0.3333333333333333 * Float64(rand * sqrt(Float64(a - 0.3333333333333333)))); else tmp = Float64(a - 0.3333333333333333); end return tmp end
function tmp_2 = code(a, rand) tmp = 0.0; if ((rand <= -1.02e+70) || ~((rand <= 7.4e+96))) tmp = 0.3333333333333333 * (rand * sqrt((a - 0.3333333333333333))); else tmp = a - 0.3333333333333333; end tmp_2 = tmp; end
code[a_, rand_] := If[Or[LessEqual[rand, -1.02e+70], N[Not[LessEqual[rand, 7.4e+96]], $MachinePrecision]], N[(0.3333333333333333 * N[(rand * N[Sqrt[N[(a - 0.3333333333333333), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]), $MachinePrecision], N[(a - 0.3333333333333333), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;rand \leq -1.02 \cdot 10^{+70} \lor \neg \left(rand \leq 7.4 \cdot 10^{+96}\right):\\
\;\;\;\;0.3333333333333333 \cdot \left(rand \cdot \sqrt{a - 0.3333333333333333}\right)\\
\mathbf{else}:\\
\;\;\;\;a - 0.3333333333333333\\
\end{array}
\end{array}
if rand < -1.02e70 or 7.39999999999999982e96 < rand Initial program 98.7%
sub-neg98.7%
metadata-eval98.7%
metadata-eval98.7%
*-commutative98.7%
sub-neg98.7%
metadata-eval98.7%
metadata-eval98.7%
Simplified98.7%
Applied egg-rr99.5%
remove-double-neg99.5%
distribute-rgt-neg-in99.5%
metadata-eval99.5%
*-commutative99.5%
associate-/r*99.6%
+-commutative99.6%
Simplified99.6%
Taylor expanded in rand around inf 95.7%
if -1.02e70 < rand < 7.39999999999999982e96Initial program 100.0%
sub-neg100.0%
metadata-eval100.0%
metadata-eval100.0%
associate-*l/100.0%
*-lft-identity100.0%
sub-neg100.0%
distribute-lft-in100.0%
metadata-eval100.0%
metadata-eval100.0%
metadata-eval100.0%
Simplified100.0%
Taylor expanded in rand around 0 93.3%
Final simplification94.2%
(FPCore (a rand) :precision binary64 (if (or (<= rand -3.5e+84) (not (<= rand 1.15e+97))) (* rand (sqrt (+ -0.037037037037037035 (* a 0.1111111111111111)))) (- a 0.3333333333333333)))
double code(double a, double rand) {
double tmp;
if ((rand <= -3.5e+84) || !(rand <= 1.15e+97)) {
tmp = rand * sqrt((-0.037037037037037035 + (a * 0.1111111111111111)));
} else {
tmp = a - 0.3333333333333333;
}
return tmp;
}
real(8) function code(a, rand)
real(8), intent (in) :: a
real(8), intent (in) :: rand
real(8) :: tmp
if ((rand <= (-3.5d+84)) .or. (.not. (rand <= 1.15d+97))) then
tmp = rand * sqrt(((-0.037037037037037035d0) + (a * 0.1111111111111111d0)))
else
tmp = a - 0.3333333333333333d0
end if
code = tmp
end function
public static double code(double a, double rand) {
double tmp;
if ((rand <= -3.5e+84) || !(rand <= 1.15e+97)) {
tmp = rand * Math.sqrt((-0.037037037037037035 + (a * 0.1111111111111111)));
} else {
tmp = a - 0.3333333333333333;
}
return tmp;
}
def code(a, rand): tmp = 0 if (rand <= -3.5e+84) or not (rand <= 1.15e+97): tmp = rand * math.sqrt((-0.037037037037037035 + (a * 0.1111111111111111))) else: tmp = a - 0.3333333333333333 return tmp
function code(a, rand) tmp = 0.0 if ((rand <= -3.5e+84) || !(rand <= 1.15e+97)) tmp = Float64(rand * sqrt(Float64(-0.037037037037037035 + Float64(a * 0.1111111111111111)))); else tmp = Float64(a - 0.3333333333333333); end return tmp end
function tmp_2 = code(a, rand) tmp = 0.0; if ((rand <= -3.5e+84) || ~((rand <= 1.15e+97))) tmp = rand * sqrt((-0.037037037037037035 + (a * 0.1111111111111111))); else tmp = a - 0.3333333333333333; end tmp_2 = tmp; end
code[a_, rand_] := If[Or[LessEqual[rand, -3.5e+84], N[Not[LessEqual[rand, 1.15e+97]], $MachinePrecision]], N[(rand * N[Sqrt[N[(-0.037037037037037035 + N[(a * 0.1111111111111111), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision], N[(a - 0.3333333333333333), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;rand \leq -3.5 \cdot 10^{+84} \lor \neg \left(rand \leq 1.15 \cdot 10^{+97}\right):\\
\;\;\;\;rand \cdot \sqrt{-0.037037037037037035 + a \cdot 0.1111111111111111}\\
\mathbf{else}:\\
\;\;\;\;a - 0.3333333333333333\\
\end{array}
\end{array}
if rand < -3.4999999999999999e84 or 1.15000000000000003e97 < rand Initial program 98.7%
sub-neg98.7%
metadata-eval98.7%
metadata-eval98.7%
*-commutative98.7%
sub-neg98.7%
metadata-eval98.7%
metadata-eval98.7%
Simplified98.7%
Applied egg-rr99.5%
remove-double-neg99.5%
distribute-rgt-neg-in99.5%
metadata-eval99.5%
*-commutative99.5%
associate-/r*99.6%
+-commutative99.6%
Simplified99.6%
Taylor expanded in rand around inf 95.7%
*-commutative95.7%
sub-neg95.7%
metadata-eval95.7%
+-commutative95.7%
associate-*l*95.6%
+-commutative95.6%
Simplified95.6%
expm1-log1p-u92.0%
expm1-udef92.0%
add-sqr-sqrt92.0%
sqrt-unprod92.0%
swap-sqr92.0%
add-sqr-sqrt92.0%
metadata-eval92.0%
Applied egg-rr92.0%
expm1-def92.0%
expm1-log1p95.8%
*-commutative95.8%
+-commutative95.8%
distribute-lft-in95.8%
metadata-eval95.8%
Simplified95.8%
if -3.4999999999999999e84 < rand < 1.15000000000000003e97Initial program 100.0%
sub-neg100.0%
metadata-eval100.0%
metadata-eval100.0%
associate-*l/100.0%
*-lft-identity100.0%
sub-neg100.0%
distribute-lft-in100.0%
metadata-eval100.0%
metadata-eval100.0%
metadata-eval100.0%
Simplified100.0%
Taylor expanded in rand around 0 93.3%
Final simplification94.2%
(FPCore (a rand) :precision binary64 (+ a (- (* (* rand 0.3333333333333333) (sqrt (+ a -0.3333333333333333))) 0.3333333333333333)))
double code(double a, double rand) {
return a + (((rand * 0.3333333333333333) * sqrt((a + -0.3333333333333333))) - 0.3333333333333333);
}
real(8) function code(a, rand)
real(8), intent (in) :: a
real(8), intent (in) :: rand
code = a + (((rand * 0.3333333333333333d0) * sqrt((a + (-0.3333333333333333d0)))) - 0.3333333333333333d0)
end function
public static double code(double a, double rand) {
return a + (((rand * 0.3333333333333333) * Math.sqrt((a + -0.3333333333333333))) - 0.3333333333333333);
}
def code(a, rand): return a + (((rand * 0.3333333333333333) * math.sqrt((a + -0.3333333333333333))) - 0.3333333333333333)
function code(a, rand) return Float64(a + Float64(Float64(Float64(rand * 0.3333333333333333) * sqrt(Float64(a + -0.3333333333333333))) - 0.3333333333333333)) end
function tmp = code(a, rand) tmp = a + (((rand * 0.3333333333333333) * sqrt((a + -0.3333333333333333))) - 0.3333333333333333); end
code[a_, rand_] := N[(a + N[(N[(N[(rand * 0.3333333333333333), $MachinePrecision] * N[Sqrt[N[(a + -0.3333333333333333), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] - 0.3333333333333333), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
a + \left(\left(rand \cdot 0.3333333333333333\right) \cdot \sqrt{a + -0.3333333333333333} - 0.3333333333333333\right)
\end{array}
Initial program 99.5%
sub-neg99.5%
metadata-eval99.5%
metadata-eval99.5%
*-commutative99.5%
sub-neg99.5%
metadata-eval99.5%
metadata-eval99.5%
Simplified99.5%
Applied egg-rr99.8%
remove-double-neg99.8%
distribute-rgt-neg-in99.8%
metadata-eval99.8%
*-commutative99.8%
associate-/r*99.8%
+-commutative99.8%
Simplified99.8%
Taylor expanded in rand around 0 99.8%
associate--l+99.8%
associate-*r*99.8%
sub-neg99.8%
metadata-eval99.8%
Simplified99.8%
Final simplification99.8%
(FPCore (a rand) :precision binary64 (- a 0.3333333333333333))
double code(double a, double rand) {
return a - 0.3333333333333333;
}
real(8) function code(a, rand)
real(8), intent (in) :: a
real(8), intent (in) :: rand
code = a - 0.3333333333333333d0
end function
public static double code(double a, double rand) {
return a - 0.3333333333333333;
}
def code(a, rand): return a - 0.3333333333333333
function code(a, rand) return Float64(a - 0.3333333333333333) end
function tmp = code(a, rand) tmp = a - 0.3333333333333333; end
code[a_, rand_] := N[(a - 0.3333333333333333), $MachinePrecision]
\begin{array}{l}
\\
a - 0.3333333333333333
\end{array}
Initial program 99.5%
sub-neg99.5%
metadata-eval99.5%
metadata-eval99.5%
associate-*l/99.5%
*-lft-identity99.5%
sub-neg99.5%
distribute-lft-in99.5%
metadata-eval99.5%
metadata-eval99.5%
metadata-eval99.5%
Simplified99.5%
Taylor expanded in rand around 0 59.7%
Final simplification59.7%
(FPCore (a rand) :precision binary64 a)
double code(double a, double rand) {
return a;
}
real(8) function code(a, rand)
real(8), intent (in) :: a
real(8), intent (in) :: rand
code = a
end function
public static double code(double a, double rand) {
return a;
}
def code(a, rand): return a
function code(a, rand) return a end
function tmp = code(a, rand) tmp = a; end
code[a_, rand_] := a
\begin{array}{l}
\\
a
\end{array}
Initial program 99.5%
sub-neg99.5%
metadata-eval99.5%
metadata-eval99.5%
associate-*l/99.5%
*-lft-identity99.5%
sub-neg99.5%
distribute-lft-in99.5%
metadata-eval99.5%
metadata-eval99.5%
metadata-eval99.5%
Simplified99.5%
Taylor expanded in a around inf 59.6%
Final simplification59.6%
herbie shell --seed 2024020
(FPCore (a rand)
:name "Octave 3.8, oct_fill_randg"
:precision binary64
(* (- a (/ 1.0 3.0)) (+ 1.0 (* (/ 1.0 (sqrt (* 9.0 (- a (/ 1.0 3.0))))) rand))))