Average Error: 5.3 → 0.1
Time: 2.3s
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 r313170 = x;
        double r313171 = y;
        double r313172 = r313171 * r313171;
        double r313173 = r313170 / r313172;
        double r313174 = 3.0;
        double r313175 = r313173 - r313174;
        return r313175;
}
↓
double f(double x, double y) {
        double r313176 = x;
        double r313177 = y;
        double r313178 = r313176 / r313177;
        double r313179 = r313178 / r313177;
        double r313180 = 3.0;
        double r313181 = r313179 - r313180;
        return r313181;
}

Error

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Bits error versus y

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Results

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Target

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

Derivation

  1. Initial program 5.3

    \[\frac{x}{y \cdot y} - 3\]
  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 2020062 
(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))