Average Error: 6.8 → 0.2
Time: 1.8m
Precision: 64
Internal Precision: 576
\[\left(x.re \cdot x.re - x.im \cdot x.im\right) \cdot x.im + \left(x.re \cdot x.im + x.im \cdot x.re\right) \cdot x.re\]
↓
\[(\left(x.re - x.im\right) \cdot \left(\left(x.im + x.re\right) \cdot x.im\right) + \left(\left(\left(x.im + x.im\right) \cdot x.re\right) \cdot x.re\right))_*\]

Error

Bits error versus x.re

Bits error versus x.im

Derivation

  1. Initial program 6.8

    \[\left(x.re \cdot x.re - x.im \cdot x.im\right) \cdot x.im + \left(x.re \cdot x.im + x.im \cdot x.re\right) \cdot x.re\]

  2. Applied simplify6.8

    \[\leadsto \color{blue}{(\left(x.re - x.im\right) \cdot \left(\left(x.im + x.re\right) \cdot x.im\right) + \left(\left(x.im + x.im\right) \cdot \left(x.re \cdot x.re\right)\right))_*}\]
  3. Using strategy rm

  4. Applied associate-*r*0.2

    \[\leadsto (\left(x.re - x.im\right) \cdot \left(\left(x.im + x.re\right) \cdot x.im\right) + \color{blue}{\left(\left(\left(x.im + x.im\right) \cdot x.re\right) \cdot x.re\right)})_*\]

Runtime

Time bar (total: 1.8m)Debug logProfile

herbie shell --seed 2020178 +o rules:numerics
(FPCore (x.re x.im)
  :name "math.cube on complex, imaginary part"
  (+ (* (- (* x.re x.re) (* x.im x.im)) x.im) (* (+ (* x.re x.im) (* x.im x.re)) x.re)))