Average Error: 4.9 → 0.1
Time: 16.4s
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 r15953137 = x;
        double r15953138 = y;
        double r15953139 = r15953138 * r15953138;
        double r15953140 = r15953137 / r15953139;
        double r15953141 = 3.0;
        double r15953142 = r15953140 - r15953141;
        return r15953142;
}
↓
double f(double x, double y) {
        double r15953143 = x;
        double r15953144 = y;
        double r15953145 = r15953143 / r15953144;
        double r15953146 = r15953145 / r15953144;
        double r15953147 = 3.0;
        double r15953148 = r15953146 - r15953147;
        return r15953148;
}

Error

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Bits error versus y

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Results

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Target

Original4.9
Target0.1
Herbie0.1
\[\frac{\frac{x}{y}}{y} - 3\]

Derivation

  1. Initial program 4.9

    \[\frac{x}{y \cdot y} - 3\]
  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 2019170 
(FPCore (x y)
  :name "Statistics.Sample:$skurtosis from math-functions-0.1.5.2"

  :herbie-target
  (- (/ (/ x y) y) 3.0)

  (- (/ x (* y y)) 3.0))