Average Error: 8.2 → 0.0
Time: 6.5s
Precision: 64
\[\frac{x \cdot y}{y + 1}\]
↓
\[\frac{y}{y + 1} \cdot x\]
\frac{x \cdot y}{y + 1}
↓
\frac{y}{y + 1} \cdot x
double f(double x, double y) {
        double r43868748 = x;
        double r43868749 = y;
        double r43868750 = r43868748 * r43868749;
        double r43868751 = 1.0;
        double r43868752 = r43868749 + r43868751;
        double r43868753 = r43868750 / r43868752;
        return r43868753;
}
↓
double f(double x, double y) {
        double r43868754 = y;
        double r43868755 = 1.0;
        double r43868756 = r43868754 + r43868755;
        double r43868757 = r43868754 / r43868756;
        double r43868758 = x;
        double r43868759 = r43868757 * r43868758;
        return r43868759;
}

Error

Bits error versus x

Bits error versus y

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original8.2
Target0.0
Herbie0.0
\[\begin{array}{l} \mathbf{if}\;y \lt -3693.848278829724677052581682801246643066:\\ \;\;\;\;\frac{x}{y \cdot y} - \left(\frac{x}{y} - x\right)\\ \mathbf{elif}\;y \lt 6799310503.41891002655029296875:\\ \;\;\;\;\frac{x \cdot y}{y + 1}\\ \mathbf{else}:\\ \;\;\;\;\frac{x}{y \cdot y} - \left(\frac{x}{y} - x\right)\\ \end{array}\]

Derivation

  1. Initial program 8.2

    \[\frac{x \cdot y}{y + 1}\]
  2. Using strategy rm

  3. Applied *-un-lft-identity8.2

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

  4. Applied times-frac0.0

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

  5. Simplified0.0

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

  6. Final simplification0.0

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

Reproduce

herbie shell --seed 2019171 
(FPCore (x y)
  :name "Diagrams.Trail:splitAtParam  from diagrams-lib-1.3.0.3, B"

  :herbie-target
  (if (< y -3693.8482788297247) (- (/ x (* y y)) (- (/ x y) x)) (if (< y 6799310503.41891) (/ (* x y) (+ y 1.0)) (- (/ x (* y y)) (- (/ x y) x))))

  (/ (* x y) (+ y 1.0)))