Average Error: 5.2 → 0.1
Time: 8.7s
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 r241548 = x;
        double r241549 = y;
        double r241550 = r241549 * r241549;
        double r241551 = r241548 / r241550;
        double r241552 = 3.0;
        double r241553 = r241551 - r241552;
        return r241553;
}
↓
double f(double x, double y) {
        double r241554 = x;
        double r241555 = y;
        double r241556 = r241554 / r241555;
        double r241557 = r241556 / r241555;
        double r241558 = 3.0;
        double r241559 = r241557 - r241558;
        return r241559;
}

Error

Bits error versus x

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 2019297 
(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))