
(FPCore (ux uy maxCos) :precision binary32 (let* ((t_0 (+ (- 1.0 ux) (* ux maxCos)))) (* (sin (* (* uy 2.0) (PI))) (sqrt (- 1.0 (* t_0 t_0))))))
\begin{array}{l}
\\
\begin{array}{l}
t_0 := \left(1 - ux\right) + ux \cdot maxCos\\
\sin \left(\left(uy \cdot 2\right) \cdot \mathsf{PI}\left(\right)\right) \cdot \sqrt{1 - t\_0 \cdot t\_0}
\end{array}
\end{array}
Sampling outcomes in binary32 precision:
Herbie found 11 alternatives:
| Alternative | Accuracy | Speedup |
|---|
(FPCore (ux uy maxCos) :precision binary32 (let* ((t_0 (+ (- 1.0 ux) (* ux maxCos)))) (* (sin (* (* uy 2.0) (PI))) (sqrt (- 1.0 (* t_0 t_0))))))
\begin{array}{l}
\\
\begin{array}{l}
t_0 := \left(1 - ux\right) + ux \cdot maxCos\\
\sin \left(\left(uy \cdot 2\right) \cdot \mathsf{PI}\left(\right)\right) \cdot \sqrt{1 - t\_0 \cdot t\_0}
\end{array}
\end{array}
(FPCore (ux uy maxCos)
:precision binary32
(let* ((t_0 (- 2.0 (* (pow (- maxCos 1.0) 2.0) ux))))
(*
(sqrt
(/
(* (- (pow (* -2.0 maxCos) 2.0) (pow t_0 2.0)) ux)
(- (* -2.0 maxCos) t_0)))
(sin (* (PI) (* 2.0 uy))))))\begin{array}{l}
\\
\begin{array}{l}
t_0 := 2 - {\left(maxCos - 1\right)}^{2} \cdot ux\\
\sqrt{\frac{\left({\left(-2 \cdot maxCos\right)}^{2} - {t\_0}^{2}\right) \cdot ux}{-2 \cdot maxCos - t\_0}} \cdot \sin \left(\mathsf{PI}\left(\right) \cdot \left(2 \cdot uy\right)\right)
\end{array}
\end{array}
Initial program 57.1%
lift-+.f32N/A
lift--.f32N/A
flip--N/A
metadata-evalN/A
div-subN/A
associate-+l-N/A
lower--.f32N/A
lower-/.f32N/A
+-commutativeN/A
lower-+.f32N/A
lower--.f32N/A
lower-/.f32N/A
lower-*.f32N/A
+-commutativeN/A
lower-+.f3257.3
lift-*.f32N/A
*-commutativeN/A
lower-*.f3257.3
Applied rewrites57.3%
Taylor expanded in ux around 0
*-commutativeN/A
lower-*.f32N/A
lower--.f32N/A
mul-1-negN/A
unsub-negN/A
lower--.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-pow.f32N/A
lower--.f32N/A
*-commutativeN/A
lower-*.f3298.4
Applied rewrites98.4%
Applied rewrites98.4%
Final simplification98.4%
(FPCore (ux uy maxCos) :precision binary32 (* (sqrt (* (* ux ux) (- (/ (+ (* -2.0 maxCos) 2.0) ux) (pow (- maxCos 1.0) 2.0)))) (sin (* (PI) (* 2.0 uy)))))
\begin{array}{l}
\\
\sqrt{\left(ux \cdot ux\right) \cdot \left(\frac{-2 \cdot maxCos + 2}{ux} - {\left(maxCos - 1\right)}^{2}\right)} \cdot \sin \left(\mathsf{PI}\left(\right) \cdot \left(2 \cdot uy\right)\right)
\end{array}
Initial program 57.1%
lift-+.f32N/A
lift--.f32N/A
flip--N/A
metadata-evalN/A
div-subN/A
associate-+l-N/A
lower--.f32N/A
lower-/.f32N/A
+-commutativeN/A
lower-+.f32N/A
lower--.f32N/A
lower-/.f32N/A
lower-*.f32N/A
+-commutativeN/A
lower-+.f3257.3
lift-*.f32N/A
*-commutativeN/A
lower-*.f3257.3
Applied rewrites57.3%
Taylor expanded in ux around inf
*-commutativeN/A
lower-*.f32N/A
associate--r+N/A
associate-*r/N/A
metadata-evalN/A
associate-*r/N/A
div-subN/A
cancel-sign-sub-invN/A
metadata-evalN/A
lower--.f32N/A
lower-/.f32N/A
+-commutativeN/A
lower-fma.f32N/A
lower-pow.f32N/A
lower--.f32N/A
unpow2N/A
lower-*.f3222.4
Applied rewrites24.2%
Applied rewrites98.4%
Final simplification98.4%
(FPCore (ux uy maxCos) :precision binary32 (* (sqrt (* (- 2.0 (- (* (pow (- maxCos 1.0) 2.0) ux) (* -2.0 maxCos))) ux)) (sin (* (PI) (* 2.0 uy)))))
\begin{array}{l}
\\
\sqrt{\left(2 - \left({\left(maxCos - 1\right)}^{2} \cdot ux - -2 \cdot maxCos\right)\right) \cdot ux} \cdot \sin \left(\mathsf{PI}\left(\right) \cdot \left(2 \cdot uy\right)\right)
\end{array}
Initial program 57.1%
lift-+.f32N/A
lift--.f32N/A
flip--N/A
metadata-evalN/A
div-subN/A
associate-+l-N/A
lower--.f32N/A
lower-/.f32N/A
+-commutativeN/A
lower-+.f32N/A
lower--.f32N/A
lower-/.f32N/A
lower-*.f32N/A
+-commutativeN/A
lower-+.f3257.3
lift-*.f32N/A
*-commutativeN/A
lower-*.f3257.3
Applied rewrites57.3%
Taylor expanded in ux around 0
*-commutativeN/A
lower-*.f32N/A
lower--.f32N/A
mul-1-negN/A
unsub-negN/A
lower--.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-pow.f32N/A
lower--.f32N/A
*-commutativeN/A
lower-*.f3298.4
Applied rewrites98.4%
Applied rewrites98.4%
Final simplification98.4%
(FPCore (ux uy maxCos) :precision binary32 (* (sqrt (- (* (- 2.0 ux) ux) (* (* (fma -2.0 ux 2.0) ux) maxCos))) (sin (* (PI) (* 2.0 uy)))))
\begin{array}{l}
\\
\sqrt{\left(2 - ux\right) \cdot ux - \left(\mathsf{fma}\left(-2, ux, 2\right) \cdot ux\right) \cdot maxCos} \cdot \sin \left(\mathsf{PI}\left(\right) \cdot \left(2 \cdot uy\right)\right)
\end{array}
Initial program 57.1%
lift-+.f32N/A
lift--.f32N/A
flip--N/A
metadata-evalN/A
div-subN/A
associate-+l-N/A
lower--.f32N/A
lower-/.f32N/A
+-commutativeN/A
lower-+.f32N/A
lower--.f32N/A
lower-/.f32N/A
lower-*.f32N/A
+-commutativeN/A
lower-+.f3257.3
lift-*.f32N/A
*-commutativeN/A
lower-*.f3257.3
Applied rewrites57.3%
Taylor expanded in ux around 0
*-commutativeN/A
lower-*.f32N/A
lower--.f32N/A
mul-1-negN/A
unsub-negN/A
lower--.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-pow.f32N/A
lower--.f32N/A
*-commutativeN/A
lower-*.f3298.4
Applied rewrites98.4%
Taylor expanded in maxCos around 0
Applied rewrites89.0%
Final simplification87.4%
(FPCore (ux uy maxCos) :precision binary32 (* (sqrt (* (- (- 2.0 (* (fma -2.0 ux 2.0) maxCos)) ux) ux)) (sin (* (PI) (* 2.0 uy)))))
\begin{array}{l}
\\
\sqrt{\left(\left(2 - \mathsf{fma}\left(-2, ux, 2\right) \cdot maxCos\right) - ux\right) \cdot ux} \cdot \sin \left(\mathsf{PI}\left(\right) \cdot \left(2 \cdot uy\right)\right)
\end{array}
Initial program 57.1%
lift-+.f32N/A
lift--.f32N/A
flip--N/A
metadata-evalN/A
div-subN/A
associate-+l-N/A
lower--.f32N/A
lower-/.f32N/A
+-commutativeN/A
lower-+.f32N/A
lower--.f32N/A
lower-/.f32N/A
lower-*.f32N/A
+-commutativeN/A
lower-+.f3257.3
lift-*.f32N/A
*-commutativeN/A
lower-*.f3257.3
Applied rewrites57.3%
Taylor expanded in ux around 0
*-commutativeN/A
lower-*.f32N/A
lower--.f32N/A
mul-1-negN/A
unsub-negN/A
lower--.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-pow.f32N/A
lower--.f32N/A
*-commutativeN/A
lower-*.f3298.4
Applied rewrites98.4%
Taylor expanded in maxCos around 0
Applied rewrites89.4%
Final simplification88.1%
(FPCore (ux uy maxCos) :precision binary32 (* (sqrt (* (- 2.0 ux) ux)) (sin (* (PI) (* 2.0 uy)))))
\begin{array}{l}
\\
\sqrt{\left(2 - ux\right) \cdot ux} \cdot \sin \left(\mathsf{PI}\left(\right) \cdot \left(2 \cdot uy\right)\right)
\end{array}
Initial program 57.1%
lift-+.f32N/A
lift--.f32N/A
flip--N/A
metadata-evalN/A
div-subN/A
associate-+l-N/A
lower--.f32N/A
lower-/.f32N/A
+-commutativeN/A
lower-+.f32N/A
lower--.f32N/A
lower-/.f32N/A
lower-*.f32N/A
+-commutativeN/A
lower-+.f3257.3
lift-*.f32N/A
*-commutativeN/A
lower-*.f3257.3
Applied rewrites57.3%
Taylor expanded in ux around 0
*-commutativeN/A
lower-*.f32N/A
lower--.f32N/A
mul-1-negN/A
unsub-negN/A
lower--.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-pow.f32N/A
lower--.f32N/A
*-commutativeN/A
lower-*.f3298.4
Applied rewrites98.4%
Taylor expanded in maxCos around 0
Applied rewrites93.6%
Final simplification93.6%
(FPCore (ux uy maxCos) :precision binary32 (* (* (* (PI) 2.0) uy) (sqrt (- (* (- 2.0 ux) ux) (* (* (fma -2.0 ux 2.0) ux) maxCos)))))
\begin{array}{l}
\\
\left(\left(\mathsf{PI}\left(\right) \cdot 2\right) \cdot uy\right) \cdot \sqrt{\left(2 - ux\right) \cdot ux - \left(\mathsf{fma}\left(-2, ux, 2\right) \cdot ux\right) \cdot maxCos}
\end{array}
Initial program 57.1%
lift-+.f32N/A
lift--.f32N/A
flip--N/A
metadata-evalN/A
div-subN/A
associate-+l-N/A
lower--.f32N/A
lower-/.f32N/A
+-commutativeN/A
lower-+.f32N/A
lower--.f32N/A
lower-/.f32N/A
lower-*.f32N/A
+-commutativeN/A
lower-+.f3257.3
lift-*.f32N/A
*-commutativeN/A
lower-*.f3257.3
Applied rewrites57.3%
Taylor expanded in ux around 0
*-commutativeN/A
lower-*.f32N/A
lower--.f32N/A
mul-1-negN/A
unsub-negN/A
lower--.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-pow.f32N/A
lower--.f32N/A
*-commutativeN/A
lower-*.f3298.4
Applied rewrites98.4%
Taylor expanded in uy around 0
*-commutativeN/A
associate-*r*N/A
lower-*.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-PI.f3281.8
Applied rewrites81.8%
Taylor expanded in maxCos around 0
Applied rewrites81.1%
(FPCore (ux uy maxCos) :precision binary32 (* (* (* (PI) 2.0) uy) (sqrt (* (- (- 2.0 (* (fma -2.0 ux 2.0) maxCos)) ux) ux))))
\begin{array}{l}
\\
\left(\left(\mathsf{PI}\left(\right) \cdot 2\right) \cdot uy\right) \cdot \sqrt{\left(\left(2 - \mathsf{fma}\left(-2, ux, 2\right) \cdot maxCos\right) - ux\right) \cdot ux}
\end{array}
Initial program 57.1%
lift-+.f32N/A
lift--.f32N/A
flip--N/A
metadata-evalN/A
div-subN/A
associate-+l-N/A
lower--.f32N/A
lower-/.f32N/A
+-commutativeN/A
lower-+.f32N/A
lower--.f32N/A
lower-/.f32N/A
lower-*.f32N/A
+-commutativeN/A
lower-+.f3257.3
lift-*.f32N/A
*-commutativeN/A
lower-*.f3257.3
Applied rewrites57.3%
Taylor expanded in ux around 0
*-commutativeN/A
lower-*.f32N/A
lower--.f32N/A
mul-1-negN/A
unsub-negN/A
lower--.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-pow.f32N/A
lower--.f32N/A
*-commutativeN/A
lower-*.f3298.4
Applied rewrites98.4%
Taylor expanded in uy around 0
*-commutativeN/A
associate-*r*N/A
lower-*.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-PI.f3281.8
Applied rewrites81.8%
Taylor expanded in maxCos around 0
Applied rewrites81.1%
(FPCore (ux uy maxCos) :precision binary32 (* (* (* (PI) 2.0) uy) (sqrt (* (- 2.0 ux) ux))))
\begin{array}{l}
\\
\left(\left(\mathsf{PI}\left(\right) \cdot 2\right) \cdot uy\right) \cdot \sqrt{\left(2 - ux\right) \cdot ux}
\end{array}
Initial program 57.1%
lift-+.f32N/A
lift--.f32N/A
flip--N/A
metadata-evalN/A
div-subN/A
associate-+l-N/A
lower--.f32N/A
lower-/.f32N/A
+-commutativeN/A
lower-+.f32N/A
lower--.f32N/A
lower-/.f32N/A
lower-*.f32N/A
+-commutativeN/A
lower-+.f3257.3
lift-*.f32N/A
*-commutativeN/A
lower-*.f3257.3
Applied rewrites57.3%
Taylor expanded in ux around 0
*-commutativeN/A
lower-*.f32N/A
lower--.f32N/A
mul-1-negN/A
unsub-negN/A
lower--.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-pow.f32N/A
lower--.f32N/A
*-commutativeN/A
lower-*.f3298.4
Applied rewrites98.4%
Taylor expanded in uy around 0
*-commutativeN/A
associate-*r*N/A
lower-*.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-PI.f3281.8
Applied rewrites81.8%
Taylor expanded in maxCos around 0
Applied rewrites78.5%
(FPCore (ux uy maxCos) :precision binary32 (* (sqrt (fma -1.0 1.0 1.0)) (* (* (PI) 2.0) uy)))
\begin{array}{l}
\\
\sqrt{\mathsf{fma}\left(-1, 1, 1\right)} \cdot \left(\left(\mathsf{PI}\left(\right) \cdot 2\right) \cdot uy\right)
\end{array}
Initial program 57.1%
Taylor expanded in uy around 0
*-commutativeN/A
associate-*r*N/A
lower-*.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-PI.f3249.0
Applied rewrites49.0%
Taylor expanded in ux around 0
Applied rewrites7.1%
lift--.f32N/A
sub-negN/A
+-commutativeN/A
neg-mul-1N/A
lower-fma.f3220.4
Applied rewrites20.3%
Final simplification20.4%
(FPCore (ux uy maxCos) :precision binary32 (* (sqrt (- 1.0 1.0)) (* (* (PI) 2.0) uy)))
\begin{array}{l}
\\
\sqrt{1 - 1} \cdot \left(\left(\mathsf{PI}\left(\right) \cdot 2\right) \cdot uy\right)
\end{array}
Initial program 57.1%
Taylor expanded in uy around 0
*-commutativeN/A
associate-*r*N/A
lower-*.f32N/A
*-commutativeN/A
lower-*.f32N/A
lower-PI.f3249.0
Applied rewrites49.0%
Taylor expanded in ux around 0
Applied rewrites7.1%
Final simplification7.1%
herbie shell --seed 2024264
(FPCore (ux uy maxCos)
:name "UniformSampleCone, y"
:precision binary32
:pre (and (and (and (<= 2.328306437e-10 ux) (<= ux 1.0)) (and (<= 2.328306437e-10 uy) (<= uy 1.0))) (and (<= 0.0 maxCos) (<= maxCos 1.0)))
(* (sin (* (* uy 2.0) (PI))) (sqrt (- 1.0 (* (+ (- 1.0 ux) (* ux maxCos)) (+ (- 1.0 ux) (* ux maxCos)))))))