Average Error: 9.8 → 0.2
Time: 2.7s
Precision: 64
\[\frac{x}{y \cdot y}\]
↓
\[\frac{\frac{x}{y}}{y}\]
\frac{x}{y \cdot y}
↓
\frac{\frac{x}{y}}{y}
double f(double x, double y) {
        double r361120 = x;
        double r361121 = y;
        double r361122 = r361121 * r361121;
        double r361123 = r361120 / r361122;
        return r361123;
}
↓
double f(double x, double y) {
        double r361124 = x;
        double r361125 = y;
        double r361126 = r361124 / r361125;
        double r361127 = r361126 / r361125;
        return r361127;
}

Error

Bits error versus x

Bits error versus y

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Results

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Target

Original9.8
Target0.2
Herbie0.2
\[\frac{\frac{x}{y}}{y}\]

Derivation

  1. Initial program 9.8

    \[\frac{x}{y \cdot y}\]
  2. Using strategy rm

  3. Applied associate-/r*0.2

    \[\leadsto \color{blue}{\frac{\frac{x}{y}}{y}}\]

  4. Final simplification0.2

    \[\leadsto \frac{\frac{x}{y}}{y}\]

Reproduce

herbie shell --seed 2020003 
(FPCore (x y)
  :name "Physics.ForceLayout:coulombForce from force-layout-0.4.0.2"
  :precision binary64

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

  (/ x (* y y)))