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Target

Derivation

1. Split input into 2 regimes

2. if x < -0.00013987136899060065

   1. Initial program 0.0

      \[\frac{e^{x} - 1}{x}\]

   2. Initial simplification0.0

      \[\leadsto \frac{-1 + e^{x}}{x}\]
   3. Using strategy rm

   4. Applied add-log-exp0.0

      \[\leadsto \frac{\color{blue}{\log \left(e^{-1 + e^{x}}\right)}}{x}\]

   if -0.00013987136899060065 < x

   1. Initial program 60.1

      \[\frac{e^{x} - 1}{x}\]

   2. Initial simplification60.1

      \[\leadsto \frac{-1 + e^{x}}{x}\]

   3. Taylor expanded around 0 0.5

      \[\leadsto \color{blue}{\frac{1}{2} \cdot x + \left(\frac{1}{6} \cdot {x}^{2} + 1\right)}\]
   4. Using strategy rm

   5. Applied associate-+r+0.5

      \[\leadsto \color{blue}{\left(\frac{1}{2} \cdot x + \frac{1}{6} \cdot {x}^{2}\right) + 1}\]
3. Recombined 2 regimes into one program.

4. Final simplification0.3

   \[\leadsto \begin{array}{l} \mathbf{if}\;x \le -0.00013987136899060065:\\ \;\;\;\;\frac{\log \left(e^{-1 + e^{x}}\right)}{x}\\ \mathbf{else}:\\ \;\;\;\;\left(\frac{1}{2} \cdot x + \frac{1}{6} \cdot {x}^{2}\right) + 1\\ \end{array}\]

Runtime

Time bar (total: 15.0s)Debug logProfile

herbie shell --seed 2018285 
(FPCore (x)
  :name "Kahan's exp quotient"

  :herbie-target
  (if (and (< x 1) (> x -1)) (/ (- (exp x) 1) (log (exp x))) (/ (- (exp x) 1) x))

  (/ (- (exp x) 1) x))