Average Error: 5.1 → 0.1
Time: 2.4s
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 r406474 = x;
        double r406475 = y;
        double r406476 = r406475 * r406475;
        double r406477 = r406474 / r406476;
        double r406478 = 3.0;
        double r406479 = r406477 - r406478;
        return r406479;
}
↓
double f(double x, double y) {
        double r406480 = x;
        double r406481 = y;
        double r406482 = r406480 / r406481;
        double r406483 = r406482 / r406481;
        double r406484 = 3.0;
        double r406485 = r406483 - r406484;
        return r406485;
}

Error

Bits error versus x

Bits error versus y

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Results

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Target

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

Derivation

  1. Initial program 5.1

    \[\frac{x}{y \cdot y} - 3\]
  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 2020035 
(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))