Average Error: 0.4 → 0.3
Time: 59.6s
Precision: 64
Internal Precision: 128
\[\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5\]
\[(\left(\frac{1}{6} \cdot \cos \left(\sqrt{\left(2 \cdot \pi\right) \cdot u2} \cdot \sqrt{\left(2 \cdot \pi\right) \cdot u2}\right)\right) \cdot \left({\left({-1}^{1.0} \cdot {-2}^{1.0}\right)}^{0.5} \cdot {\left({\left(-\log u1\right)}^{1.0}\right)}^{0.5}\right) + 0.5)_*\]

Error

Bits error versus u1

Bits error versus u2

Derivation

  1. Initial program 0.4

    \[\left(\frac{1}{6} \cdot {\left(-2 \cdot \log u1\right)}^{0.5}\right) \cdot \cos \left(\left(2 \cdot \pi\right) \cdot u2\right) + 0.5\]
  2. Initial simplification0.4

    \[\leadsto (\left(\cos \left(\pi \cdot \left(2 \cdot u2\right)\right)\right) \cdot \left({\left(-2 \cdot \log u1\right)}^{0.5} \cdot \frac{1}{6}\right) + 0.5)_*\]
  3. Taylor expanded around inf 0.4

    \[\leadsto \color{blue}{\frac{1}{6} \cdot \left(\cos \left(2 \cdot \left(u2 \cdot \pi\right)\right) \cdot {\left({-1}^{1.0} \cdot \left({-2}^{1.0} \cdot {\left(\log \left(\frac{1}{u1}\right)\right)}^{1.0}\right)\right)}^{0.5}\right) + 0.5}\]
  4. Simplified0.4

    \[\leadsto \color{blue}{(\left(\frac{1}{6} \cdot \cos \left(\left(\pi \cdot 2\right) \cdot u2\right)\right) \cdot \left({\left({\left(-\log u1\right)}^{1.0} \cdot \left({-2}^{1.0} \cdot {-1}^{1.0}\right)\right)}^{0.5}\right) + 0.5)_*}\]
  5. Using strategy rm
  6. Applied unpow-prod-down0.3

    \[\leadsto (\left(\frac{1}{6} \cdot \cos \left(\left(\pi \cdot 2\right) \cdot u2\right)\right) \cdot \color{blue}{\left({\left({\left(-\log u1\right)}^{1.0}\right)}^{0.5} \cdot {\left({-2}^{1.0} \cdot {-1}^{1.0}\right)}^{0.5}\right)} + 0.5)_*\]
  7. Using strategy rm
  8. Applied add-sqr-sqrt0.3

    \[\leadsto (\left(\frac{1}{6} \cdot \cos \color{blue}{\left(\sqrt{\left(\pi \cdot 2\right) \cdot u2} \cdot \sqrt{\left(\pi \cdot 2\right) \cdot u2}\right)}\right) \cdot \left({\left({\left(-\log u1\right)}^{1.0}\right)}^{0.5} \cdot {\left({-2}^{1.0} \cdot {-1}^{1.0}\right)}^{0.5}\right) + 0.5)_*\]
  9. Final simplification0.3

    \[\leadsto (\left(\frac{1}{6} \cdot \cos \left(\sqrt{\left(2 \cdot \pi\right) \cdot u2} \cdot \sqrt{\left(2 \cdot \pi\right) \cdot u2}\right)\right) \cdot \left({\left({-1}^{1.0} \cdot {-2}^{1.0}\right)}^{0.5} \cdot {\left({\left(-\log u1\right)}^{1.0}\right)}^{0.5}\right) + 0.5)_*\]

Runtime

Time bar (total: 59.6s)Debug logProfile

BaselineHerbieOracleSpan%
Regimes0.30.30.00.30%
herbie shell --seed 2018351 +o rules:numerics
(FPCore (u1 u2)
  :name "normal distribution"
  :pre (and (<= 0 u1 1) (<= 0 u2 1))
  (+ (* (* (/ 1 6) (pow (* -2 (log u1)) 0.5)) (cos (* (* 2 PI) u2))) 0.5))