Average Error: 5.4 → 0.1
Time: 10.3s
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 r380157 = x;
        double r380158 = y;
        double r380159 = r380158 * r380158;
        double r380160 = r380157 / r380159;
        double r380161 = 3.0;
        double r380162 = r380160 - r380161;
        return r380162;
}
↓
double f(double x, double y) {
        double r380163 = x;
        double r380164 = y;
        double r380165 = r380163 / r380164;
        double r380166 = r380165 / r380164;
        double r380167 = 3.0;
        double r380168 = r380166 - r380167;
        return r380168;
}

Error

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Bits error versus y

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Results

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Target

Original5.4
Target0.1
Herbie0.1
\[\frac{\frac{x}{y}}{y} - 3\]

Derivation

  1. Initial program 5.4

    \[\frac{x}{y \cdot y} - 3\]
  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 2020047 +o rules:numerics
(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))