Average Error: 46.2 → 0.3
Time: 1.1m
Precision: 64
Internal Precision: 128
\[\frac{\frac{\left(i \cdot i\right) \cdot \left(i \cdot i\right)}{\left(2 \cdot i\right) \cdot \left(2 \cdot i\right)}}{\left(2 \cdot i\right) \cdot \left(2 \cdot i\right) - 1.0}\]
\[\frac{\sqrt{i} \cdot \sqrt{i}}{2 \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) + \sqrt{1.0}} \cdot \frac{\sqrt{i} \cdot \sqrt{i}}{\left(2 \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) - \sqrt{1.0}\right) \cdot 4}\]

Error

Bits error versus i

Derivation

  1. Initial program 46.2

    \[\frac{\frac{\left(i \cdot i\right) \cdot \left(i \cdot i\right)}{\left(2 \cdot i\right) \cdot \left(2 \cdot i\right)}}{\left(2 \cdot i\right) \cdot \left(2 \cdot i\right) - 1.0}\]
  2. Simplified15.9

    \[\leadsto \color{blue}{\frac{i \cdot i}{\left(4 \cdot \left(i \cdot i\right) - 1.0\right) \cdot 4}}\]
  3. Using strategy rm
  4. Applied add-sqr-sqrt15.9

    \[\leadsto \frac{i \cdot i}{\left(4 \cdot \left(i \cdot i\right) - \color{blue}{\sqrt{1.0} \cdot \sqrt{1.0}}\right) \cdot 4}\]
  5. Applied add-sqr-sqrt16.0

    \[\leadsto \frac{i \cdot i}{\left(4 \cdot \left(i \cdot \color{blue}{\left(\sqrt{i} \cdot \sqrt{i}\right)}\right) - \sqrt{1.0} \cdot \sqrt{1.0}\right) \cdot 4}\]
  6. Applied add-sqr-sqrt16.0

    \[\leadsto \frac{i \cdot i}{\left(4 \cdot \left(\color{blue}{\left(\sqrt{i} \cdot \sqrt{i}\right)} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right)\right) - \sqrt{1.0} \cdot \sqrt{1.0}\right) \cdot 4}\]
  7. Applied swap-sqr16.0

    \[\leadsto \frac{i \cdot i}{\left(4 \cdot \color{blue}{\left(\left(\sqrt{i} \cdot \sqrt{i}\right) \cdot \left(\sqrt{i} \cdot \sqrt{i}\right)\right)} - \sqrt{1.0} \cdot \sqrt{1.0}\right) \cdot 4}\]
  8. Applied add-sqr-sqrt16.0

    \[\leadsto \frac{i \cdot i}{\left(\color{blue}{\left(\sqrt{4} \cdot \sqrt{4}\right)} \cdot \left(\left(\sqrt{i} \cdot \sqrt{i}\right) \cdot \left(\sqrt{i} \cdot \sqrt{i}\right)\right) - \sqrt{1.0} \cdot \sqrt{1.0}\right) \cdot 4}\]
  9. Applied unswap-sqr16.0

    \[\leadsto \frac{i \cdot i}{\left(\color{blue}{\left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right)\right) \cdot \left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right)\right)} - \sqrt{1.0} \cdot \sqrt{1.0}\right) \cdot 4}\]
  10. Applied difference-of-squares16.0

    \[\leadsto \frac{i \cdot i}{\color{blue}{\left(\left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) + \sqrt{1.0}\right) \cdot \left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) - \sqrt{1.0}\right)\right)} \cdot 4}\]
  11. Applied associate-*l*16.0

    \[\leadsto \frac{i \cdot i}{\color{blue}{\left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) + \sqrt{1.0}\right) \cdot \left(\left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) - \sqrt{1.0}\right) \cdot 4\right)}}\]
  12. Applied add-sqr-sqrt16.1

    \[\leadsto \frac{i \cdot \color{blue}{\left(\sqrt{i} \cdot \sqrt{i}\right)}}{\left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) + \sqrt{1.0}\right) \cdot \left(\left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) - \sqrt{1.0}\right) \cdot 4\right)}\]
  13. Applied add-sqr-sqrt16.0

    \[\leadsto \frac{\color{blue}{\left(\sqrt{i} \cdot \sqrt{i}\right)} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right)}{\left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) + \sqrt{1.0}\right) \cdot \left(\left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) - \sqrt{1.0}\right) \cdot 4\right)}\]
  14. Applied unswap-sqr16.0

    \[\leadsto \frac{\color{blue}{\left(\sqrt{i} \cdot \sqrt{i}\right) \cdot \left(\sqrt{i} \cdot \sqrt{i}\right)}}{\left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) + \sqrt{1.0}\right) \cdot \left(\left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) - \sqrt{1.0}\right) \cdot 4\right)}\]
  15. Applied times-frac0.3

    \[\leadsto \color{blue}{\frac{\sqrt{i} \cdot \sqrt{i}}{\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) + \sqrt{1.0}} \cdot \frac{\sqrt{i} \cdot \sqrt{i}}{\left(\sqrt{4} \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) - \sqrt{1.0}\right) \cdot 4}}\]
  16. Final simplification0.3

    \[\leadsto \frac{\sqrt{i} \cdot \sqrt{i}}{2 \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) + \sqrt{1.0}} \cdot \frac{\sqrt{i} \cdot \sqrt{i}}{\left(2 \cdot \left(\sqrt{i} \cdot \sqrt{i}\right) - \sqrt{1.0}\right) \cdot 4}\]

Reproduce

herbie shell --seed 2019088 
(FPCore (i)
  :name "Octave 3.8, jcobi/4, as called"
  :pre (and (> i 0))
  (/ (/ (* (* i i) (* i i)) (* (* 2 i) (* 2 i))) (- (* (* 2 i) (* 2 i)) 1.0)))