Average Error: 0.4 → 0.2
Time: 5.2s
Precision: 64
\[\frac{x \cdot 100.0}{x + y}\]
↓
\[\frac{100.0}{x + y} \cdot x\]
\frac{x \cdot 100.0}{x + y}
↓
\frac{100.0}{x + y} \cdot x
double f(double x, double y) {
        double r15975197 = x;
        double r15975198 = 100.0;
        double r15975199 = r15975197 * r15975198;
        double r15975200 = y;
        double r15975201 = r15975197 + r15975200;
        double r15975202 = r15975199 / r15975201;
        return r15975202;
}
↓
double f(double x, double y) {
        double r15975203 = 100.0;
        double r15975204 = x;
        double r15975205 = y;
        double r15975206 = r15975204 + r15975205;
        double r15975207 = r15975203 / r15975206;
        double r15975208 = r15975207 * r15975204;
        return r15975208;
}

Error

Bits error versus x

Bits error versus y

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Results

Enter valid numbers for all inputs

Target

Original0.4
Target0.2
Herbie0.2
\[\frac{x}{1} \cdot \frac{100.0}{x + y}\]

Derivation

  1. Initial program 0.4

    \[\frac{x \cdot 100.0}{x + y}\]
  2. Using strategy rm

  3. Applied *-un-lft-identity0.4

    \[\leadsto \frac{x \cdot 100.0}{\color{blue}{1 \cdot \left(x + y\right)}}\]

  4. Applied times-frac0.2

    \[\leadsto \color{blue}{\frac{x}{1} \cdot \frac{100.0}{x + y}}\]

  5. Simplified0.2

    \[\leadsto \color{blue}{x} \cdot \frac{100.0}{x + y}\]

  6. Final simplification0.2

    \[\leadsto \frac{100.0}{x + y} \cdot x\]

Reproduce

herbie shell --seed 2019156 
(FPCore (x y)
  :name "Development.Shake.Progress:message from shake-0.15.5"

  :herbie-target
  (* (/ x 1) (/ 100.0 (+ x y)))

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