Average Error: 11.9 → 2.9
Time: 18.3s
Precision: 64
\[\frac{x \cdot \left(y - z\right)}{y}\]
↓
\[\begin{array}{l} \mathbf{if}\;y \le -3.398060602669454:\\ \;\;\;\;x - x \cdot \frac{z}{y}\\ \mathbf{else}:\\ \;\;\;\;x - \frac{x \cdot z}{y}\\ \end{array}\]
\frac{x \cdot \left(y - z\right)}{y}
↓
\begin{array}{l}
\mathbf{if}\;y \le -3.398060602669454:\\
\;\;\;\;x - x \cdot \frac{z}{y}\\

\mathbf{else}:\\
\;\;\;\;x - \frac{x \cdot z}{y}\\

\end{array}
double f(double x, double y, double z) {
        double r35049355 = x;
        double r35049356 = y;
        double r35049357 = z;
        double r35049358 = r35049356 - r35049357;
        double r35049359 = r35049355 * r35049358;
        double r35049360 = r35049359 / r35049356;
        return r35049360;
}
↓
double f(double x, double y, double z) {
        double r35049361 = y;
        double r35049362 = -3.398060602669454;
        bool r35049363 = r35049361 <= r35049362;
        double r35049364 = x;
        double r35049365 = z;
        double r35049366 = r35049365 / r35049361;
        double r35049367 = r35049364 * r35049366;
        double r35049368 = r35049364 - r35049367;
        double r35049369 = r35049364 * r35049365;
        double r35049370 = r35049369 / r35049361;
        double r35049371 = r35049364 - r35049370;
        double r35049372 = r35049363 ? r35049368 : r35049371;
        return r35049372;
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original11.9
Target2.7
Herbie2.9
\[\begin{array}{l} \mathbf{if}\;z \lt -2.060202331921739 \cdot 10^{+104}:\\ \;\;\;\;x - \frac{z \cdot x}{y}\\ \mathbf{elif}\;z \lt 1.6939766013828526 \cdot 10^{+213}:\\ \;\;\;\;\frac{x}{\frac{y}{y - z}}\\ \mathbf{else}:\\ \;\;\;\;\left(y - z\right) \cdot \frac{x}{y}\\ \end{array}\]

Derivation

  1. Split input into 2 regimes

  2. if y < -3.398060602669454

    1. Initial program 15.9

      \[\frac{x \cdot \left(y - z\right)}{y}\]

    2. Taylor expanded around 0 5.1

      \[\leadsto \color{blue}{x - \frac{x \cdot z}{y}}\]
    3. Using strategy rm

    4. Applied *-un-lft-identity5.1

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

    5. Applied times-frac0.0

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

    6. Simplified0.0

      \[\leadsto x - \color{blue}{x} \cdot \frac{z}{y}\]

    if -3.398060602669454 < y

    1. Initial program 10.3

      \[\frac{x \cdot \left(y - z\right)}{y}\]

    2. Taylor expanded around 0 4.1

      \[\leadsto \color{blue}{x - \frac{x \cdot z}{y}}\]
  3. Recombined 2 regimes into one program.

  4. Final simplification2.9

    \[\leadsto \begin{array}{l} \mathbf{if}\;y \le -3.398060602669454:\\ \;\;\;\;x - x \cdot \frac{z}{y}\\ \mathbf{else}:\\ \;\;\;\;x - \frac{x \cdot z}{y}\\ \end{array}\]

Reproduce

herbie shell --seed 2019163 +o rules:numerics
(FPCore (x y z)
  :name "Diagrams.Backend.Cairo.Internal:setTexture from diagrams-cairo-1.3.0.3"

  :herbie-target
  (if (< z -2.060202331921739e+104) (- x (/ (* z x) y)) (if (< z 1.6939766013828526e+213) (/ x (/ y (- y z))) (* (- y z) (/ x y))))

  (/ (* x (- y z)) y))