Main:bigenough1 from B

Average Error: 0.0 → 0

Time: 424.0ms

Precision: 64

Math

\[x + x \cdot x\]

↓

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

C

double f(double x) {
        double r120845 = x;
        double r120846 = r120845 * r120845;
        double r120847 = r120845 + r120846;
        return r120847;
}

↓

double f(double x) {
        double r120848 = x;
        double r120849 = fma(r120848, r120848, r120848);
        return r120849;
}

Error

Bits error versus x

Derivation

1. Initial program 0.0

   \[x + x \cdot x\]

2. Simplified 0

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

3. Final simplification 0

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

Reproduce

herbie shell --seed 2020062 +o rules:numerics
(FPCore (x)
  :name "Main:bigenough1 from B"
  :precision binary64
  (+ x (* x x)))