Average Error: 15.3 → 0.0
Time: 21.4s
Precision: 64
\[\frac{x - y}{\left(x \cdot 2\right) \cdot y}\]
↓
\[\frac{0.5}{y} - \frac{0.5}{x}\]
\frac{x - y}{\left(x \cdot 2\right) \cdot y}
↓
\frac{0.5}{y} - \frac{0.5}{x}
double f(double x, double y) {
        double r497835 = x;
        double r497836 = y;
        double r497837 = r497835 - r497836;
        double r497838 = 2.0;
        double r497839 = r497835 * r497838;
        double r497840 = r497839 * r497836;
        double r497841 = r497837 / r497840;
        return r497841;
}
↓
double f(double x, double y) {
        double r497842 = 0.5;
        double r497843 = y;
        double r497844 = r497842 / r497843;
        double r497845 = x;
        double r497846 = r497842 / r497845;
        double r497847 = r497844 - r497846;
        return r497847;
}

Error

Bits error versus x

Bits error versus y

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Results

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Target

Original15.3
Target0.0
Herbie0.0
\[\frac{0.5}{y} - \frac{0.5}{x}\]

Derivation

  1. Initial program 15.3

    \[\frac{x - y}{\left(x \cdot 2\right) \cdot y}\]

  2. Simplified7.4

    \[\leadsto \color{blue}{\frac{\frac{x - y}{x}}{2 \cdot y}}\]

  3. Taylor expanded around 0 0.0

    \[\leadsto \color{blue}{0.5 \cdot \frac{1}{y} - 0.5 \cdot \frac{1}{x}}\]

  4. Simplified0.0

    \[\leadsto \color{blue}{\frac{0.5}{y} - \frac{0.5}{x}}\]

  5. Final simplification0.0

    \[\leadsto \frac{0.5}{y} - \frac{0.5}{x}\]

Reproduce

herbie shell --seed 2019194 
(FPCore (x y)
  :name "Linear.Projection:inversePerspective from linear-1.19.1.3, B"

  :herbie-target
  (- (/ 0.5 y) (/ 0.5 x))

  (/ (- x y) (* (* x 2.0) y)))