Average Error: 0.0 → 0.0
Time: 1.9s
Precision: binary64
\[e^{-\left(1 - x \cdot x\right)}\]
\[e^{-1} \cdot {\left(e^{\sqrt{{x}^{2}}}\right)}^{\left(\sqrt{{x}^{2}}\right)}\]

Error

Bits error versus x

Derivation

  1. Initial program 0.0

    \[e^{-\left(1 - x \cdot x\right)}\]
  2. Using strategy rm
  3. Applied sub-neg0.0

    \[\leadsto e^{-\color{blue}{\left(1 + \left(-x \cdot x\right)\right)}}\]
  4. Applied distribute-neg-in0.0

    \[\leadsto e^{\color{blue}{\left(-1\right) + \left(-\left(-x \cdot x\right)\right)}}\]
  5. Applied exp-sum0.0

    \[\leadsto \color{blue}{e^{-1} \cdot e^{-\left(-x \cdot x\right)}}\]
  6. Simplified0.0

    \[\leadsto e^{-1} \cdot \color{blue}{e^{{x}^{2}}}\]
  7. Using strategy rm
  8. Applied add-sqr-sqrt0.0

    \[\leadsto e^{-1} \cdot e^{\color{blue}{\sqrt{{x}^{2}} \cdot \sqrt{{x}^{2}}}}\]
  9. Applied exp-prod0.0

    \[\leadsto e^{-1} \cdot \color{blue}{{\left(e^{\sqrt{{x}^{2}}}\right)}^{\left(\sqrt{{x}^{2}}\right)}}\]
  10. Final simplification0.0

    \[\leadsto e^{-1} \cdot {\left(e^{\sqrt{{x}^{2}}}\right)}^{\left(\sqrt{{x}^{2}}\right)}\]

Reproduce

herbie shell --seed 2020161 
(FPCore (x)
  :name "exp neg sub"
  :precision binary64
  (exp (neg (- 1.0 (* x x)))))