
(FPCore (z)
:precision binary64
(let* ((t_0 (- (- 1.0 z) 1.0)) (t_1 (+ t_0 7.0)) (t_2 (+ t_1 0.5)))
(*
(/ (PI) (sin (* (PI) z)))
(*
(* (* (sqrt (* (PI) 2.0)) (pow t_2 (+ t_0 0.5))) (exp (- t_2)))
(+
(+
(+
(+
(+
(+
(+
(+ 0.9999999999998099 (/ 676.5203681218851 (+ t_0 1.0)))
(/ -1259.1392167224028 (+ t_0 2.0)))
(/ 771.3234287776531 (+ t_0 3.0)))
(/ -176.6150291621406 (+ t_0 4.0)))
(/ 12.507343278686905 (+ t_0 5.0)))
(/ -0.13857109526572012 (+ t_0 6.0)))
(/ 9.984369578019572e-6 t_1))
(/ 1.5056327351493116e-7 (+ t_0 8.0)))))))\begin{array}{l}
\\
\begin{array}{l}
t_0 := \left(1 - z\right) - 1\\
t_1 := t\_0 + 7\\
t_2 := t\_1 + 0.5\\
\frac{\mathsf{PI}\left(\right)}{\sin \left(\mathsf{PI}\left(\right) \cdot z\right)} \cdot \left(\left(\left(\sqrt{\mathsf{PI}\left(\right) \cdot 2} \cdot {t\_2}^{\left(t\_0 + 0.5\right)}\right) \cdot e^{-t\_2}\right) \cdot \left(\left(\left(\left(\left(\left(\left(\left(0.9999999999998099 + \frac{676.5203681218851}{t\_0 + 1}\right) + \frac{-1259.1392167224028}{t\_0 + 2}\right) + \frac{771.3234287776531}{t\_0 + 3}\right) + \frac{-176.6150291621406}{t\_0 + 4}\right) + \frac{12.507343278686905}{t\_0 + 5}\right) + \frac{-0.13857109526572012}{t\_0 + 6}\right) + \frac{9.984369578019572 \cdot 10^{-6}}{t\_1}\right) + \frac{1.5056327351493116 \cdot 10^{-7}}{t\_0 + 8}\right)\right)
\end{array}
\end{array}
Sampling outcomes in binary64 precision:
Herbie found 5 alternatives:
| Alternative | Accuracy | Speedup |
|---|
(FPCore (z)
:precision binary64
(let* ((t_0 (- (- 1.0 z) 1.0)) (t_1 (+ t_0 7.0)) (t_2 (+ t_1 0.5)))
(*
(/ (PI) (sin (* (PI) z)))
(*
(* (* (sqrt (* (PI) 2.0)) (pow t_2 (+ t_0 0.5))) (exp (- t_2)))
(+
(+
(+
(+
(+
(+
(+
(+ 0.9999999999998099 (/ 676.5203681218851 (+ t_0 1.0)))
(/ -1259.1392167224028 (+ t_0 2.0)))
(/ 771.3234287776531 (+ t_0 3.0)))
(/ -176.6150291621406 (+ t_0 4.0)))
(/ 12.507343278686905 (+ t_0 5.0)))
(/ -0.13857109526572012 (+ t_0 6.0)))
(/ 9.984369578019572e-6 t_1))
(/ 1.5056327351493116e-7 (+ t_0 8.0)))))))\begin{array}{l}
\\
\begin{array}{l}
t_0 := \left(1 - z\right) - 1\\
t_1 := t\_0 + 7\\
t_2 := t\_1 + 0.5\\
\frac{\mathsf{PI}\left(\right)}{\sin \left(\mathsf{PI}\left(\right) \cdot z\right)} \cdot \left(\left(\left(\sqrt{\mathsf{PI}\left(\right) \cdot 2} \cdot {t\_2}^{\left(t\_0 + 0.5\right)}\right) \cdot e^{-t\_2}\right) \cdot \left(\left(\left(\left(\left(\left(\left(\left(0.9999999999998099 + \frac{676.5203681218851}{t\_0 + 1}\right) + \frac{-1259.1392167224028}{t\_0 + 2}\right) + \frac{771.3234287776531}{t\_0 + 3}\right) + \frac{-176.6150291621406}{t\_0 + 4}\right) + \frac{12.507343278686905}{t\_0 + 5}\right) + \frac{-0.13857109526572012}{t\_0 + 6}\right) + \frac{9.984369578019572 \cdot 10^{-6}}{t\_1}\right) + \frac{1.5056327351493116 \cdot 10^{-7}}{t\_0 + 8}\right)\right)
\end{array}
\end{array}
(FPCore (z)
:precision binary64
(let* ((t_0 (- (- 1.0 z) 1.0)))
(*
(*
(+
(/ 1.5056327351493116e-7 (+ 8.0 t_0))
(+
(/ 9.984369578019572e-6 (+ 7.0 t_0))
(+
(/ -0.13857109526572012 (+ 6.0 t_0))
(+
(/ 12.507343278686905 (+ 5.0 t_0))
(+
(/ -176.6150291621406 (+ 4.0 t_0))
(+
(/ 771.3234287776531 (+ 3.0 t_0))
(-
(+ (/ -1259.1392167224028 (- (- 1.0 z) -1.0)) 0.9999999999998099)
(/ 676.5203681218851 (+ -1.0 z)))))))))
(exp
(fma
(log (* 2.0 (PI)))
0.5
(fma (log (- (- 1.0 z) -6.5)) (- (- 1.0 z) 0.5) (- -6.5 (- 1.0 z))))))
(/ (PI) (sin (* z (PI)))))))\begin{array}{l}
\\
\begin{array}{l}
t_0 := \left(1 - z\right) - 1\\
\left(\left(\frac{1.5056327351493116 \cdot 10^{-7}}{8 + t\_0} + \left(\frac{9.984369578019572 \cdot 10^{-6}}{7 + t\_0} + \left(\frac{-0.13857109526572012}{6 + t\_0} + \left(\frac{12.507343278686905}{5 + t\_0} + \left(\frac{-176.6150291621406}{4 + t\_0} + \left(\frac{771.3234287776531}{3 + t\_0} + \left(\left(\frac{-1259.1392167224028}{\left(1 - z\right) - -1} + 0.9999999999998099\right) - \frac{676.5203681218851}{-1 + z}\right)\right)\right)\right)\right)\right)\right) \cdot e^{\mathsf{fma}\left(\log \left(2 \cdot \mathsf{PI}\left(\right)\right), 0.5, \mathsf{fma}\left(\log \left(\left(1 - z\right) - -6.5\right), \left(1 - z\right) - 0.5, -6.5 - \left(1 - z\right)\right)\right)}\right) \cdot \frac{\mathsf{PI}\left(\right)}{\sin \left(z \cdot \mathsf{PI}\left(\right)\right)}
\end{array}
\end{array}
Initial program 95.8%
lift-*.f64N/A
lift-*.f64N/A
associate-*l*N/A
lift-sqrt.f64N/A
pow1/2N/A
pow-to-expN/A
lift-pow.f64N/A
pow-to-expN/A
lift-exp.f64N/A
prod-expN/A
Applied rewrites97.9%
lift-+.f64N/A
lift-+.f64N/A
+-commutativeN/A
associate-+l+N/A
lower-+.f64N/A
lift-+.f64N/A
lift--.f64N/A
associate-+l-N/A
metadata-evalN/A
--rgt-identityN/A
lower-+.f6497.9
lift-+.f64N/A
lift--.f64N/A
associate-+l-N/A
metadata-evalN/A
metadata-evalN/A
lower--.f64N/A
metadata-eval97.9
Applied rewrites97.9%
Final simplification97.9%
(FPCore (z)
:precision binary64
(let* ((t_0 (- (- 1.0 z) 1.0)))
(*
(*
(+
(+
(+
(+
(+
(+
(fma
(fma 519.1279660315847 z 361.7355639412844)
z
47.95075976068351)
(/ 771.3234287776531 (+ 3.0 t_0)))
(/ -176.6150291621406 (+ 4.0 t_0)))
(/ 12.507343278686905 (+ 5.0 t_0)))
(/ -0.13857109526572012 (+ 6.0 t_0)))
(/ 9.984369578019572e-6 (+ 7.0 t_0)))
(/ 1.5056327351493116e-7 (+ 8.0 t_0)))
(*
(exp (fma (- (- 1.0 z) 0.5) (log1p 6.5) (- -0.5 7.0)))
(sqrt (* 2.0 (PI)))))
(/ (PI) (sin (* z (PI)))))))\begin{array}{l}
\\
\begin{array}{l}
t_0 := \left(1 - z\right) - 1\\
\left(\left(\left(\left(\left(\left(\left(\mathsf{fma}\left(\mathsf{fma}\left(519.1279660315847, z, 361.7355639412844\right), z, 47.95075976068351\right) + \frac{771.3234287776531}{3 + t\_0}\right) + \frac{-176.6150291621406}{4 + t\_0}\right) + \frac{12.507343278686905}{5 + t\_0}\right) + \frac{-0.13857109526572012}{6 + t\_0}\right) + \frac{9.984369578019572 \cdot 10^{-6}}{7 + t\_0}\right) + \frac{1.5056327351493116 \cdot 10^{-7}}{8 + t\_0}\right) \cdot \left(e^{\mathsf{fma}\left(\left(1 - z\right) - 0.5, \mathsf{log1p}\left(6.5\right), -0.5 - 7\right)} \cdot \sqrt{2 \cdot \mathsf{PI}\left(\right)}\right)\right) \cdot \frac{\mathsf{PI}\left(\right)}{\sin \left(z \cdot \mathsf{PI}\left(\right)\right)}
\end{array}
\end{array}
Initial program 95.8%
Taylor expanded in z around 0
+-commutativeN/A
*-commutativeN/A
lower-fma.f64N/A
+-commutativeN/A
lower-fma.f6495.3
Applied rewrites95.3%
Taylor expanded in z around 0
Applied rewrites96.4%
Applied rewrites97.3%
Taylor expanded in z around 0
Applied rewrites97.3%
Final simplification97.3%
(FPCore (z)
:precision binary64
(let* ((t_0 (- (- 1.0 z) 1.0)))
(*
(*
(+
(+
(+
(+
(+
(+ 47.95075976068351 (/ 771.3234287776531 (+ 3.0 t_0)))
(/ -176.6150291621406 (+ 4.0 t_0)))
(/ 12.507343278686905 (+ 5.0 t_0)))
(/ -0.13857109526572012 (+ 6.0 t_0)))
(/ 9.984369578019572e-6 (+ 7.0 t_0)))
(/ 1.5056327351493116e-7 (+ 8.0 t_0)))
(* (* (sqrt 15.0) (exp -7.5)) (pow (* (PI) (PI)) 0.25)))
(/ (PI) (sin (* z (PI)))))))\begin{array}{l}
\\
\begin{array}{l}
t_0 := \left(1 - z\right) - 1\\
\left(\left(\left(\left(\left(\left(\left(47.95075976068351 + \frac{771.3234287776531}{3 + t\_0}\right) + \frac{-176.6150291621406}{4 + t\_0}\right) + \frac{12.507343278686905}{5 + t\_0}\right) + \frac{-0.13857109526572012}{6 + t\_0}\right) + \frac{9.984369578019572 \cdot 10^{-6}}{7 + t\_0}\right) + \frac{1.5056327351493116 \cdot 10^{-7}}{8 + t\_0}\right) \cdot \left(\left(\sqrt{15} \cdot e^{-7.5}\right) \cdot {\left(\mathsf{PI}\left(\right) \cdot \mathsf{PI}\left(\right)\right)}^{0.25}\right)\right) \cdot \frac{\mathsf{PI}\left(\right)}{\sin \left(z \cdot \mathsf{PI}\left(\right)\right)}
\end{array}
\end{array}
Initial program 95.8%
Taylor expanded in z around 0
*-commutativeN/A
lower-*.f64N/A
*-commutativeN/A
lower-*.f64N/A
*-commutativeN/A
lower-*.f64N/A
lower-sqrt.f64N/A
lower-sqrt.f64N/A
lower-exp.f64N/A
lower-sqrt.f64N/A
lower-PI.f6493.8
Applied rewrites93.8%
Taylor expanded in z around 0
Applied rewrites95.0%
Applied rewrites95.0%
Applied rewrites95.9%
Final simplification95.9%
(FPCore (z)
:precision binary64
(let* ((t_0 (- (- 1.0 z) 1.0)))
(*
(*
(+
(+
(+
(+
(+
(/ -176.6150291621406 4.0)
(+ 47.95075976068351 (/ 771.3234287776531 (+ 3.0 t_0))))
(/ 12.507343278686905 (+ 5.0 t_0)))
(/ -0.13857109526572012 (+ 6.0 t_0)))
(/ 9.984369578019572e-6 (+ 7.0 t_0)))
(/ 1.5056327351493116e-7 (+ 8.0 t_0)))
(* (sqrt (PI)) (* (sqrt 15.0) (exp -7.5))))
(/ (PI) (sin (* z (PI)))))))\begin{array}{l}
\\
\begin{array}{l}
t_0 := \left(1 - z\right) - 1\\
\left(\left(\left(\left(\left(\left(\frac{-176.6150291621406}{4} + \left(47.95075976068351 + \frac{771.3234287776531}{3 + t\_0}\right)\right) + \frac{12.507343278686905}{5 + t\_0}\right) + \frac{-0.13857109526572012}{6 + t\_0}\right) + \frac{9.984369578019572 \cdot 10^{-6}}{7 + t\_0}\right) + \frac{1.5056327351493116 \cdot 10^{-7}}{8 + t\_0}\right) \cdot \left(\sqrt{\mathsf{PI}\left(\right)} \cdot \left(\sqrt{15} \cdot e^{-7.5}\right)\right)\right) \cdot \frac{\mathsf{PI}\left(\right)}{\sin \left(z \cdot \mathsf{PI}\left(\right)\right)}
\end{array}
\end{array}
Initial program 95.8%
Taylor expanded in z around 0
*-commutativeN/A
lower-*.f64N/A
*-commutativeN/A
lower-*.f64N/A
*-commutativeN/A
lower-*.f64N/A
lower-sqrt.f64N/A
lower-sqrt.f64N/A
lower-exp.f64N/A
lower-sqrt.f64N/A
lower-PI.f6493.8
Applied rewrites93.8%
Taylor expanded in z around 0
Applied rewrites95.0%
Applied rewrites95.0%
Taylor expanded in z around 0
Applied rewrites95.0%
Final simplification95.0%
(FPCore (z)
:precision binary64
(let* ((t_0 (- (- 1.0 z) 1.0)))
(*
(*
(+
(+
(+
(+
(+
(+ (/ 771.3234287776531 3.0) 47.95075976068351)
(/ -176.6150291621406 (+ 4.0 t_0)))
(/ 12.507343278686905 (+ 5.0 t_0)))
(/ -0.13857109526572012 (+ 6.0 t_0)))
(/ 9.984369578019572e-6 (+ 7.0 t_0)))
(/ 1.5056327351493116e-7 (+ 8.0 t_0)))
(* (sqrt (PI)) (* (sqrt 15.0) (exp -7.5))))
(/ (PI) (sin (* z (PI)))))))\begin{array}{l}
\\
\begin{array}{l}
t_0 := \left(1 - z\right) - 1\\
\left(\left(\left(\left(\left(\left(\left(\frac{771.3234287776531}{3} + 47.95075976068351\right) + \frac{-176.6150291621406}{4 + t\_0}\right) + \frac{12.507343278686905}{5 + t\_0}\right) + \frac{-0.13857109526572012}{6 + t\_0}\right) + \frac{9.984369578019572 \cdot 10^{-6}}{7 + t\_0}\right) + \frac{1.5056327351493116 \cdot 10^{-7}}{8 + t\_0}\right) \cdot \left(\sqrt{\mathsf{PI}\left(\right)} \cdot \left(\sqrt{15} \cdot e^{-7.5}\right)\right)\right) \cdot \frac{\mathsf{PI}\left(\right)}{\sin \left(z \cdot \mathsf{PI}\left(\right)\right)}
\end{array}
\end{array}
Initial program 95.8%
Taylor expanded in z around 0
*-commutativeN/A
lower-*.f64N/A
*-commutativeN/A
lower-*.f64N/A
*-commutativeN/A
lower-*.f64N/A
lower-sqrt.f64N/A
lower-sqrt.f64N/A
lower-exp.f64N/A
lower-sqrt.f64N/A
lower-PI.f6493.8
Applied rewrites93.8%
Taylor expanded in z around 0
Applied rewrites95.0%
Applied rewrites95.0%
Taylor expanded in z around 0
Applied rewrites94.9%
Final simplification94.9%
herbie shell --seed 2024303
(FPCore (z)
:name "Jmat.Real.gamma, branch z less than 0.5"
:precision binary64
:pre (<= z 0.5)
(* (/ (PI) (sin (* (PI) z))) (* (* (* (sqrt (* (PI) 2.0)) (pow (+ (+ (- (- 1.0 z) 1.0) 7.0) 0.5) (+ (- (- 1.0 z) 1.0) 0.5))) (exp (- (+ (+ (- (- 1.0 z) 1.0) 7.0) 0.5)))) (+ (+ (+ (+ (+ (+ (+ (+ 0.9999999999998099 (/ 676.5203681218851 (+ (- (- 1.0 z) 1.0) 1.0))) (/ -1259.1392167224028 (+ (- (- 1.0 z) 1.0) 2.0))) (/ 771.3234287776531 (+ (- (- 1.0 z) 1.0) 3.0))) (/ -176.6150291621406 (+ (- (- 1.0 z) 1.0) 4.0))) (/ 12.507343278686905 (+ (- (- 1.0 z) 1.0) 5.0))) (/ -0.13857109526572012 (+ (- (- 1.0 z) 1.0) 6.0))) (/ 9.984369578019572e-6 (+ (- (- 1.0 z) 1.0) 7.0))) (/ 1.5056327351493116e-7 (+ (- (- 1.0 z) 1.0) 8.0))))))