Average Error: 0.6 → 0.2
Time: 10.7s
Precision: 64
\[\frac{1}{x \cdot x}\]
↓
\[\frac{\frac{1}{x}}{x}\]
\frac{1}{x \cdot x}
↓
\frac{\frac{1}{x}}{x}
double f(double x) {
        double r18771958 = 1.0;
        double r18771959 = x;
        double r18771960 = r18771959 * r18771959;
        double r18771961 = r18771958 / r18771960;
        return r18771961;
}
↓
double f(double x) {
        double r18771962 = 1.0;
        double r18771963 = x;
        double r18771964 = r18771962 / r18771963;
        double r18771965 = r18771964 / r18771963;
        return r18771965;
}

Error

Bits error versus x

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Results

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Target

Original0.6
Target0.2
Herbie0.2
\[\frac{\frac{1}{x}}{x}\]

Derivation

  1. Initial program 0.6

    \[\frac{1}{x \cdot x}\]
  2. Using strategy rm

  3. Applied associate-/r*0.2

    \[\leadsto \color{blue}{\frac{\frac{1}{x}}{x}}\]

  4. Final simplification0.2

    \[\leadsto \frac{\frac{1}{x}}{x}\]

Reproduce

herbie shell --seed 2019192 +o rules:numerics
(FPCore (x)
  :name "Numeric.SpecFunctions:$slogFactorial from math-functions-0.1.5.2, A"

  :herbie-target
  (/ (/ 1.0 x) x)

  (/ 1.0 (* x x)))