powComplex, imaginary part

Average Error: 33.5 → 24.8

Time: 13.5s

Precision: binary64

Math

\[\]

↓

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Error

Bits error versus x.re

Bits error versus x.im

Bits error versus y.re

Bits error versus y.im

Derivation

1. Split input into 2 regimes

2. if x.re < -8.1631930784550201e-299

   1. Initial program 31.6

      \[\]

   2. Taylor expanded around -inf 20.6

      \[\leadsto \]

   3. Simplified 20.6

      \[\leadsto \]

   if -8.1631930784550201e-299 < x.re

   1. Initial program 35.1

      \[\]

   2. Simplified 38.3

      \[\leadsto \]

   3. Taylor expanded around inf 28.6

      \[\leadsto \]

   4. Simplified 28.6

      \[\leadsto \]
3. Recombined 2 regimes into one program.

4. Final simplification 24.8

   \[\leadsto \]

Reproduce

herbie shell --seed 2020179 
(FPCore (x.re x.im y.re y.im)
  :name "powComplex, imaginary part"
  :precision binary64
  (* (exp (- (* (log (sqrt (+ (* x.re x.re) (* x.im x.im)))) y.re) (* (atan2 x.im x.re) y.im))) (sin (+ (* (log (sqrt (+ (* x.re x.re) (* x.im x.im)))) y.im) (* (atan2 x.im x.re) y.re)))))