Average Error: 0.6 → 0.2
Time: 3.6s
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 r383229 = 1.0;
        double r383230 = x;
        double r383231 = r383230 * r383230;
        double r383232 = r383229 / r383231;
        return r383232;
}
↓
double f(double x) {
        double r383233 = 1.0;
        double r383234 = x;
        double r383235 = r383233 / r383234;
        double r383236 = r383235 / r383234;
        return r383236;
}

Error

Bits error versus x

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Results

Enter valid numbers for all inputs

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 2020062 
(FPCore (x)
  :name "Numeric.SpecFunctions:$slogFactorial from math-functions-0.1.5.2, A"
  :precision binary64

  :herbie-target
  (/ (/ 1 x) x)

  (/ 1 (* x x)))