Average Error: 0.4 → 0.2
Time: 27.2s
Precision: 64
\[\frac{x \cdot 100}{x + y}\]
↓
\[\frac{100}{y + x} \cdot x\]
\frac{x \cdot 100}{x + y}
↓
\frac{100}{y + x} \cdot x
double f(double x, double y) {
        double r34968033 = x;
        double r34968034 = 100.0;
        double r34968035 = r34968033 * r34968034;
        double r34968036 = y;
        double r34968037 = r34968033 + r34968036;
        double r34968038 = r34968035 / r34968037;
        return r34968038;
}
↓
double f(double x, double y) {
        double r34968039 = 100.0;
        double r34968040 = y;
        double r34968041 = x;
        double r34968042 = r34968040 + r34968041;
        double r34968043 = r34968039 / r34968042;
        double r34968044 = r34968043 * r34968041;
        return r34968044;
}

Error

Bits error versus x

Bits error versus y

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

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 *-un-lft-identity0.4

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

  4. Applied times-frac0.2

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

  5. Simplified0.2

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

  6. Final simplification0.2

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

Reproduce

herbie shell --seed 2019200 +o rules:numerics
(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)))