Average Error: 0.4 → 0.2
Time: 6.7s
Precision: 64
\[\frac{x \cdot 100}{x + y}\]
↓
\[\frac{\frac{x}{y + x}}{\frac{1}{100}}\]
\frac{x \cdot 100}{x + y}
↓
\frac{\frac{x}{y + x}}{\frac{1}{100}}
double f(double x, double y) {
        double r36404917 = x;
        double r36404918 = 100.0;
        double r36404919 = r36404917 * r36404918;
        double r36404920 = y;
        double r36404921 = r36404917 + r36404920;
        double r36404922 = r36404919 / r36404921;
        return r36404922;
}
↓
double f(double x, double y) {
        double r36404923 = x;
        double r36404924 = y;
        double r36404925 = r36404924 + r36404923;
        double r36404926 = r36404923 / r36404925;
        double r36404927 = 1.0;
        double r36404928 = 100.0;
        double r36404929 = r36404927 / r36404928;
        double r36404930 = r36404926 / r36404929;
        return r36404930;
}

Error

Bits error versus x

Bits error versus y

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Results

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Target

Original0.4
Target0.2
Herbie0.2
\[\frac{x}{1} \cdot \frac{100}{x + y}\]

Derivation

  1. Initial program 0.4

    \[\frac{x \cdot 100}{x + y}\]
  2. Using strategy rm

  3. Applied associate-/l*0.2

    \[\leadsto \color{blue}{\frac{x}{\frac{x + y}{100}}}\]
  4. Using strategy rm

  5. Applied div-inv0.2

    \[\leadsto \frac{x}{\color{blue}{\left(x + y\right) \cdot \frac{1}{100}}}\]

  6. Applied associate-/r*0.2

    \[\leadsto \color{blue}{\frac{\frac{x}{x + y}}{\frac{1}{100}}}\]

  7. Final simplification0.2

    \[\leadsto \frac{\frac{x}{y + x}}{\frac{1}{100}}\]

Reproduce

herbie shell --seed 2019192 
(FPCore (x y)
  :name "Development.Shake.Progress:message from shake-0.15.5"

  :herbie-target
  (* (/ x 1.0) (/ 100.0 (+ x y)))

  (/ (* x 100.0) (+ x y)))