Average Error: 0.3 → 0.2
Time: 1.4s
Precision: 64
\[\frac{x}{y \cdot 3}\]
↓
\[\frac{\frac{x}{3}}{y}\]
\frac{x}{y \cdot 3}
↓
\frac{\frac{x}{3}}{y}
double f(double x, double y) {
        double r743800 = x;
        double r743801 = y;
        double r743802 = 3.0;
        double r743803 = r743801 * r743802;
        double r743804 = r743800 / r743803;
        return r743804;
}
↓
double f(double x, double y) {
        double r743805 = x;
        double r743806 = 3.0;
        double r743807 = r743805 / r743806;
        double r743808 = y;
        double r743809 = r743807 / r743808;
        return r743809;
}

Error

Bits error versus x

Bits error versus y

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Results

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Target

Original0.3
Target0.2
Herbie0.2
\[\frac{\frac{x}{y}}{3}\]

Derivation

  1. Initial program 0.3

    \[\frac{x}{y \cdot 3}\]
  2. Using strategy rm

  3. Applied *-un-lft-identity0.3

    \[\leadsto \frac{\color{blue}{1 \cdot x}}{y \cdot 3}\]

  4. Applied times-frac0.3

    \[\leadsto \color{blue}{\frac{1}{y} \cdot \frac{x}{3}}\]
  5. Using strategy rm

  6. Applied *-un-lft-identity0.3

    \[\leadsto \frac{1}{\color{blue}{1 \cdot y}} \cdot \frac{x}{3}\]

  7. Applied *-un-lft-identity0.3

    \[\leadsto \frac{\color{blue}{1 \cdot 1}}{1 \cdot y} \cdot \frac{x}{3}\]

  8. Applied times-frac0.3

    \[\leadsto \color{blue}{\left(\frac{1}{1} \cdot \frac{1}{y}\right)} \cdot \frac{x}{3}\]

  9. Applied associate-*l*0.3

    \[\leadsto \color{blue}{\frac{1}{1} \cdot \left(\frac{1}{y} \cdot \frac{x}{3}\right)}\]

  10. Simplified0.2

    \[\leadsto \frac{1}{1} \cdot \color{blue}{\frac{\frac{x}{3}}{y}}\]

  11. Final simplification0.2

    \[\leadsto \frac{\frac{x}{3}}{y}\]

Reproduce

herbie shell --seed 2020036 
(FPCore (x y)
  :name "Diagrams.Solve.Polynomial:cubForm  from diagrams-solve-0.1, C"
  :precision binary64

  :herbie-target
  (/ (/ x y) 3)

  (/ x (* y 3)))