Average Error: 0.0 → 0.0
Time: 5.7s
Precision: 64
\[\frac{x + 1.0}{1.0 - x}\]
↓
\[\frac{1.0 + x}{1.0 - x}\]
\frac{x + 1.0}{1.0 - x}
↓
\frac{1.0 + x}{1.0 - x}
double f(double x) {
        double r1703340 = x;
        double r1703341 = 1.0;
        double r1703342 = r1703340 + r1703341;
        double r1703343 = r1703341 - r1703340;
        double r1703344 = r1703342 / r1703343;
        return r1703344;
}
↓
double f(double x) {
        double r1703345 = 1.0;
        double r1703346 = x;
        double r1703347 = r1703345 + r1703346;
        double r1703348 = r1703345 - r1703346;
        double r1703349 = r1703347 / r1703348;
        return r1703349;
}

Error

Bits error versus x

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Your Program's Arguments

Results

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Derivation

  1. Initial program 0.0

    \[\frac{x + 1.0}{1.0 - x}\]

  2. Final simplification0.0

    \[\leadsto \frac{1.0 + x}{1.0 - x}\]

Reproduce

herbie shell --seed 2019163 
(FPCore (x)
  :name "Prelude:atanh from fay-base-0.20.0.1"
  (/ (+ x 1.0) (- 1.0 x)))