Average Error: 0.4 → 0.2
Time: 1.7s
Precision: 64
\[\frac{x \cdot 100}{x + y}\]
↓
\[\frac{x}{\frac{x + y}{100}}\]
\frac{x \cdot 100}{x + y}
↓
\frac{x}{\frac{x + y}{100}}
double f(double x, double y) {
        double r705638 = x;
        double r705639 = 100.0;
        double r705640 = r705638 * r705639;
        double r705641 = y;
        double r705642 = r705638 + r705641;
        double r705643 = r705640 / r705642;
        return r705643;
}
↓
double f(double x, double y) {
        double r705644 = x;
        double r705645 = y;
        double r705646 = r705644 + r705645;
        double r705647 = 100.0;
        double r705648 = r705646 / r705647;
        double r705649 = r705644 / r705648;
        return r705649;
}

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. Final simplification0.2

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

Reproduce

herbie shell --seed 2020021 
(FPCore (x y)
  :name "Development.Shake.Progress:message from shake-0.15.5"
  :precision binary64

  :herbie-target
  (* (/ x 1) (/ 100 (+ x y)))

  (/ (* x 100) (+ x y)))