Average Error: 0.0 → 0.0
Time: 550.0ms
Precision: 64
\[\left(x \cdot y + x\right) + y\]
↓
\[y + \mathsf{fma}\left(x, y, x\right)\]
\left(x \cdot y + x\right) + y
↓
y + \mathsf{fma}\left(x, y, x\right)
double f(double x, double y) {
        double r119282 = x;
        double r119283 = y;
        double r119284 = r119282 * r119283;
        double r119285 = r119284 + r119282;
        double r119286 = r119285 + r119283;
        return r119286;
}
↓
double f(double x, double y) {
        double r119287 = y;
        double r119288 = x;
        double r119289 = fma(r119288, r119287, r119288);
        double r119290 = r119287 + r119289;
        return r119290;
}

Error

Bits error versus x

Bits error versus y

Derivation

  1. Initial program 0.0

    \[\left(x \cdot y + x\right) + y\]

  2. Simplified0.0

    \[\leadsto \color{blue}{y + \mathsf{fma}\left(x, y, x\right)}\]

  3. Final simplification0.0

    \[\leadsto y + \mathsf{fma}\left(x, y, x\right)\]

Reproduce

herbie shell --seed 2019353 +o rules:numerics
(FPCore (x y)
  :name "Numeric.Log:$cexpm1 from log-domain-0.10.2.1, B"
  :precision binary64
  (+ (+ (* x y) x) y))