
(FPCore (cosTheta_i u1 u2) :precision binary32 (* (sqrt (/ u1 (- 1.0 u1))) (sin (* 6.28318530718 u2))))
float code(float cosTheta_i, float u1, float u2) {
return sqrtf((u1 / (1.0f - u1))) * sinf((6.28318530718f * u2));
}
real(4) function code(costheta_i, u1, u2)
real(4), intent (in) :: costheta_i
real(4), intent (in) :: u1
real(4), intent (in) :: u2
code = sqrt((u1 / (1.0e0 - u1))) * sin((6.28318530718e0 * u2))
end function
function code(cosTheta_i, u1, u2) return Float32(sqrt(Float32(u1 / Float32(Float32(1.0) - u1))) * sin(Float32(Float32(6.28318530718) * u2))) end
function tmp = code(cosTheta_i, u1, u2) tmp = sqrt((u1 / (single(1.0) - u1))) * sin((single(6.28318530718) * u2)); end
\begin{array}{l}
\\
\sqrt{\frac{u1}{1 - u1}} \cdot \sin \left(6.28318530718 \cdot u2\right)
\end{array}
Sampling outcomes in binary32 precision:
Herbie found 7 alternatives:
| Alternative | Accuracy | Speedup |
|---|
(FPCore (cosTheta_i u1 u2) :precision binary32 (* (sqrt (/ u1 (- 1.0 u1))) (sin (* 6.28318530718 u2))))
float code(float cosTheta_i, float u1, float u2) {
return sqrtf((u1 / (1.0f - u1))) * sinf((6.28318530718f * u2));
}
real(4) function code(costheta_i, u1, u2)
real(4), intent (in) :: costheta_i
real(4), intent (in) :: u1
real(4), intent (in) :: u2
code = sqrt((u1 / (1.0e0 - u1))) * sin((6.28318530718e0 * u2))
end function
function code(cosTheta_i, u1, u2) return Float32(sqrt(Float32(u1 / Float32(Float32(1.0) - u1))) * sin(Float32(Float32(6.28318530718) * u2))) end
function tmp = code(cosTheta_i, u1, u2) tmp = sqrt((u1 / (single(1.0) - u1))) * sin((single(6.28318530718) * u2)); end
\begin{array}{l}
\\
\sqrt{\frac{u1}{1 - u1}} \cdot \sin \left(6.28318530718 \cdot u2\right)
\end{array}
(FPCore (cosTheta_i u1 u2) :precision binary32 (* (sqrt (/ u1 (- 1.0 u1))) (sin (sqrt (* (pow u2 2.0) 39.47841760436263)))))
float code(float cosTheta_i, float u1, float u2) {
return sqrtf((u1 / (1.0f - u1))) * sinf(sqrtf((powf(u2, 2.0f) * 39.47841760436263f)));
}
real(4) function code(costheta_i, u1, u2)
real(4), intent (in) :: costheta_i
real(4), intent (in) :: u1
real(4), intent (in) :: u2
code = sqrt((u1 / (1.0e0 - u1))) * sin(sqrt(((u2 ** 2.0e0) * 39.47841760436263e0)))
end function
function code(cosTheta_i, u1, u2) return Float32(sqrt(Float32(u1 / Float32(Float32(1.0) - u1))) * sin(sqrt(Float32((u2 ^ Float32(2.0)) * Float32(39.47841760436263))))) end
function tmp = code(cosTheta_i, u1, u2) tmp = sqrt((u1 / (single(1.0) - u1))) * sin(sqrt(((u2 ^ single(2.0)) * single(39.47841760436263)))); end
\begin{array}{l}
\\
\sqrt{\frac{u1}{1 - u1}} \cdot \sin \left(\sqrt{{u2}^{2} \cdot 39.47841760436263}\right)
\end{array}
Initial program 98.2%
add-sqr-sqrt97.5%
pow297.5%
Applied egg-rr97.5%
unpow297.5%
add-sqr-sqrt98.2%
*-commutative98.2%
add-sqr-sqrt97.4%
sqrt-prod98.2%
unpow298.2%
metadata-eval97.9%
sqrt-prod98.5%
Applied egg-rr98.5%
Final simplification98.5%
(FPCore (cosTheta_i u1 u2) :precision binary32 (if (<= (* u2 6.28318530718) 0.016499999910593033) (* u2 (* (sqrt (/ u1 (- 1.0 u1))) 6.28318530718)) (* (sin (* u2 6.28318530718)) (sqrt u1))))
float code(float cosTheta_i, float u1, float u2) {
float tmp;
if ((u2 * 6.28318530718f) <= 0.016499999910593033f) {
tmp = u2 * (sqrtf((u1 / (1.0f - u1))) * 6.28318530718f);
} else {
tmp = sinf((u2 * 6.28318530718f)) * sqrtf(u1);
}
return tmp;
}
real(4) function code(costheta_i, u1, u2)
real(4), intent (in) :: costheta_i
real(4), intent (in) :: u1
real(4), intent (in) :: u2
real(4) :: tmp
if ((u2 * 6.28318530718e0) <= 0.016499999910593033e0) then
tmp = u2 * (sqrt((u1 / (1.0e0 - u1))) * 6.28318530718e0)
else
tmp = sin((u2 * 6.28318530718e0)) * sqrt(u1)
end if
code = tmp
end function
function code(cosTheta_i, u1, u2) tmp = Float32(0.0) if (Float32(u2 * Float32(6.28318530718)) <= Float32(0.016499999910593033)) tmp = Float32(u2 * Float32(sqrt(Float32(u1 / Float32(Float32(1.0) - u1))) * Float32(6.28318530718))); else tmp = Float32(sin(Float32(u2 * Float32(6.28318530718))) * sqrt(u1)); end return tmp end
function tmp_2 = code(cosTheta_i, u1, u2) tmp = single(0.0); if ((u2 * single(6.28318530718)) <= single(0.016499999910593033)) tmp = u2 * (sqrt((u1 / (single(1.0) - u1))) * single(6.28318530718)); else tmp = sin((u2 * single(6.28318530718))) * sqrt(u1); end tmp_2 = tmp; end
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;u2 \cdot 6.28318530718 \leq 0.016499999910593033:\\
\;\;\;\;u2 \cdot \left(\sqrt{\frac{u1}{1 - u1}} \cdot 6.28318530718\right)\\
\mathbf{else}:\\
\;\;\;\;\sin \left(u2 \cdot 6.28318530718\right) \cdot \sqrt{u1}\\
\end{array}
\end{array}
if (*.f32 314159265359/50000000000 u2) < 0.0164999999Initial program 98.6%
Taylor expanded in u2 around 0 96.3%
associate-*r*96.3%
Simplified96.3%
if 0.0164999999 < (*.f32 314159265359/50000000000 u2) Initial program 97.1%
Taylor expanded in u1 around 0 79.8%
Final simplification91.6%
(FPCore (cosTheta_i u1 u2) :precision binary32 (* (sqrt (/ u1 (- 1.0 u1))) (sin (* u2 6.28318530718))))
float code(float cosTheta_i, float u1, float u2) {
return sqrtf((u1 / (1.0f - u1))) * sinf((u2 * 6.28318530718f));
}
real(4) function code(costheta_i, u1, u2)
real(4), intent (in) :: costheta_i
real(4), intent (in) :: u1
real(4), intent (in) :: u2
code = sqrt((u1 / (1.0e0 - u1))) * sin((u2 * 6.28318530718e0))
end function
function code(cosTheta_i, u1, u2) return Float32(sqrt(Float32(u1 / Float32(Float32(1.0) - u1))) * sin(Float32(u2 * Float32(6.28318530718)))) end
function tmp = code(cosTheta_i, u1, u2) tmp = sqrt((u1 / (single(1.0) - u1))) * sin((u2 * single(6.28318530718))); end
\begin{array}{l}
\\
\sqrt{\frac{u1}{1 - u1}} \cdot \sin \left(u2 \cdot 6.28318530718\right)
\end{array}
Initial program 98.2%
Final simplification98.2%
(FPCore (cosTheta_i u1 u2) :precision binary32 (* 6.28318530718 (* (sqrt (/ u1 (- 1.0 u1))) u2)))
float code(float cosTheta_i, float u1, float u2) {
return 6.28318530718f * (sqrtf((u1 / (1.0f - u1))) * u2);
}
real(4) function code(costheta_i, u1, u2)
real(4), intent (in) :: costheta_i
real(4), intent (in) :: u1
real(4), intent (in) :: u2
code = 6.28318530718e0 * (sqrt((u1 / (1.0e0 - u1))) * u2)
end function
function code(cosTheta_i, u1, u2) return Float32(Float32(6.28318530718) * Float32(sqrt(Float32(u1 / Float32(Float32(1.0) - u1))) * u2)) end
function tmp = code(cosTheta_i, u1, u2) tmp = single(6.28318530718) * (sqrt((u1 / (single(1.0) - u1))) * u2); end
\begin{array}{l}
\\
6.28318530718 \cdot \left(\sqrt{\frac{u1}{1 - u1}} \cdot u2\right)
\end{array}
Initial program 98.2%
Taylor expanded in u2 around 0 80.3%
Final simplification80.3%
(FPCore (cosTheta_i u1 u2) :precision binary32 (* u2 (* (sqrt (/ u1 (- 1.0 u1))) 6.28318530718)))
float code(float cosTheta_i, float u1, float u2) {
return u2 * (sqrtf((u1 / (1.0f - u1))) * 6.28318530718f);
}
real(4) function code(costheta_i, u1, u2)
real(4), intent (in) :: costheta_i
real(4), intent (in) :: u1
real(4), intent (in) :: u2
code = u2 * (sqrt((u1 / (1.0e0 - u1))) * 6.28318530718e0)
end function
function code(cosTheta_i, u1, u2) return Float32(u2 * Float32(sqrt(Float32(u1 / Float32(Float32(1.0) - u1))) * Float32(6.28318530718))) end
function tmp = code(cosTheta_i, u1, u2) tmp = u2 * (sqrt((u1 / (single(1.0) - u1))) * single(6.28318530718)); end
\begin{array}{l}
\\
u2 \cdot \left(\sqrt{\frac{u1}{1 - u1}} \cdot 6.28318530718\right)
\end{array}
Initial program 98.2%
Taylor expanded in u2 around 0 80.3%
associate-*r*80.3%
Simplified80.3%
Final simplification80.3%
(FPCore (cosTheta_i u1 u2) :precision binary32 (* 6.28318530718 (* u2 (sqrt u1))))
float code(float cosTheta_i, float u1, float u2) {
return 6.28318530718f * (u2 * sqrtf(u1));
}
real(4) function code(costheta_i, u1, u2)
real(4), intent (in) :: costheta_i
real(4), intent (in) :: u1
real(4), intent (in) :: u2
code = 6.28318530718e0 * (u2 * sqrt(u1))
end function
function code(cosTheta_i, u1, u2) return Float32(Float32(6.28318530718) * Float32(u2 * sqrt(u1))) end
function tmp = code(cosTheta_i, u1, u2) tmp = single(6.28318530718) * (u2 * sqrt(u1)); end
\begin{array}{l}
\\
6.28318530718 \cdot \left(u2 \cdot \sqrt{u1}\right)
\end{array}
Initial program 98.2%
Taylor expanded in u2 around 0 80.3%
Taylor expanded in u1 around 0 63.0%
Final simplification63.0%
(FPCore (cosTheta_i u1 u2) :precision binary32 (* u2 (sqrt -39.47841760436263)))
float code(float cosTheta_i, float u1, float u2) {
return u2 * sqrtf(-39.47841760436263f);
}
real(4) function code(costheta_i, u1, u2)
real(4), intent (in) :: costheta_i
real(4), intent (in) :: u1
real(4), intent (in) :: u2
code = u2 * sqrt((-39.47841760436263e0))
end function
function code(cosTheta_i, u1, u2) return Float32(u2 * sqrt(Float32(-39.47841760436263))) end
function tmp = code(cosTheta_i, u1, u2) tmp = u2 * sqrt(single(-39.47841760436263)); end
\begin{array}{l}
\\
u2 \cdot \sqrt{-39.47841760436263}
\end{array}
Initial program 98.2%
Taylor expanded in u2 around 0 80.3%
add-sqr-sqrt79.8%
sqrt-unprod80.3%
*-commutative80.3%
*-commutative80.3%
swap-sqr80.1%
swap-sqr80.1%
add-sqr-sqrt80.3%
pow280.3%
metadata-eval80.5%
Applied egg-rr80.5%
associate-*l*80.6%
Simplified80.6%
Taylor expanded in u1 around -inf -0.0%
Final simplification-0.0%
herbie shell --seed 2024010
(FPCore (cosTheta_i u1 u2)
:name "Trowbridge-Reitz Sample, near normal, slope_y"
:precision binary32
:pre (and (and (and (> cosTheta_i 0.9999) (<= cosTheta_i 1.0)) (and (<= 2.328306437e-10 u1) (<= u1 1.0))) (and (<= 2.328306437e-10 u2) (<= u2 1.0)))
(* (sqrt (/ u1 (- 1.0 u1))) (sin (* 6.28318530718 u2))))