Average Error: 5.2 → 0.1
Time: 24.9s
Precision: 64
\[\frac{x}{y \cdot y} - 3\]
↓
\[\frac{\frac{x}{y}}{y} - 3\]
\frac{x}{y \cdot y} - 3
↓
\frac{\frac{x}{y}}{y} - 3
double f(double x, double y) {
        double r226023 = x;
        double r226024 = y;
        double r226025 = r226024 * r226024;
        double r226026 = r226023 / r226025;
        double r226027 = 3.0;
        double r226028 = r226026 - r226027;
        return r226028;
}
↓
double f(double x, double y) {
        double r226029 = x;
        double r226030 = y;
        double r226031 = r226029 / r226030;
        double r226032 = r226031 / r226030;
        double r226033 = 3.0;
        double r226034 = r226032 - r226033;
        return r226034;
}

Error

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Bits error versus y

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Results

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Target

Original5.2
Target0.1
Herbie0.1
\[\frac{\frac{x}{y}}{y} - 3\]

Derivation

  1. Initial program 5.2

    \[\frac{x}{y \cdot y} - 3\]
  2. Using strategy rm

  3. Applied associate-/r*0.1

    \[\leadsto \color{blue}{\frac{\frac{x}{y}}{y}} - 3\]

  4. Final simplification0.1

    \[\leadsto \frac{\frac{x}{y}}{y} - 3\]

Reproduce

herbie shell --seed 2019325 
(FPCore (x y)
  :name "Statistics.Sample:$skurtosis from math-functions-0.1.5.2"
  :precision binary64

  :herbie-target
  (- (/ (/ x y) y) 3)

  (- (/ x (* y y)) 3))