Average Error: 30.0 → 0.5
Time: 48.8s
Precision: 64
Internal Precision: 4480
\[0.5 \cdot \sqrt{2.0 \cdot \left(\sqrt{re \cdot re - im \cdot im} + re\right)}\]
\[0.5 \cdot \left(\left(\sqrt[3]{\sqrt{2.0}} \cdot \sqrt[3]{\sqrt{2.0}}\right) \cdot \left(\sqrt[3]{\sqrt{2.0}} \cdot \sqrt{(\left(\sqrt{re + im}\right) \cdot \left(\sqrt{re - im}\right) + re)_*}\right)\right)\]

Error

Bits error versus re

Bits error versus im

Derivation

  1. Initial program 30.0

    \[0.5 \cdot \sqrt{2.0 \cdot \left(\sqrt{re \cdot re - im \cdot im} + re\right)}\]
  2. Using strategy rm
  3. Applied difference-of-squares30.0

    \[\leadsto 0.5 \cdot \sqrt{2.0 \cdot \left(\sqrt{\color{blue}{\left(re + im\right) \cdot \left(re - im\right)}} + re\right)}\]
  4. Applied sqrt-prod0.1

    \[\leadsto 0.5 \cdot \sqrt{2.0 \cdot \left(\color{blue}{\sqrt{re + im} \cdot \sqrt{re - im}} + re\right)}\]
  5. Applied fma-def0.1

    \[\leadsto 0.5 \cdot \sqrt{2.0 \cdot \color{blue}{(\left(\sqrt{re + im}\right) \cdot \left(\sqrt{re - im}\right) + re)_*}}\]
  6. Using strategy rm
  7. Applied sqrt-prod0.5

    \[\leadsto 0.5 \cdot \color{blue}{\left(\sqrt{2.0} \cdot \sqrt{(\left(\sqrt{re + im}\right) \cdot \left(\sqrt{re - im}\right) + re)_*}\right)}\]
  8. Using strategy rm
  9. Applied add-cube-cbrt0.5

    \[\leadsto 0.5 \cdot \left(\color{blue}{\left(\left(\sqrt[3]{\sqrt{2.0}} \cdot \sqrt[3]{\sqrt{2.0}}\right) \cdot \sqrt[3]{\sqrt{2.0}}\right)} \cdot \sqrt{(\left(\sqrt{re + im}\right) \cdot \left(\sqrt{re - im}\right) + re)_*}\right)\]
  10. Applied associate-*l*0.5

    \[\leadsto 0.5 \cdot \color{blue}{\left(\left(\sqrt[3]{\sqrt{2.0}} \cdot \sqrt[3]{\sqrt{2.0}}\right) \cdot \left(\sqrt[3]{\sqrt{2.0}} \cdot \sqrt{(\left(\sqrt{re + im}\right) \cdot \left(\sqrt{re - im}\right) + re)_*}\right)\right)}\]

Runtime

Time bar (total: 48.8s)Debug logProfile

herbie shell --seed '#(1070578969 3140398606 632207097 462683394 1189254563 964980650)' +o rules:numerics
(FPCore (re im)
  :name "math.sqrt on complex, imaginary part, im greater than 0 branch"
  (* 0.5 (sqrt (* 2.0 (+ (sqrt (- (* re re) (* im im))) re)))))