Average Error: 0.0 → 0.0
Time: 914.0ms
Precision: binary64
\[x \cdot x + y \cdot y \]
↓
\[\mathsf{fma}\left(x, x, y \cdot y\right) \]
x \cdot x + y \cdot y
↓
\mathsf{fma}\left(x, x, y \cdot y\right)

(FPCore (x y) :precision binary64 (+ (* x x) (* y y)))
↓
(FPCore (x y) :precision binary64 (fma x x (* y y)))
double code(double x, double y) {
	return (x * x) + (y * y);
}
↓
double code(double x, double y) {
	return fma(x, x, (y * y));
}

Error

Bits error versus x

Bits error versus y

Derivation

  1. Initial program 0.0

    \[x \cdot x + y \cdot y \]

  2. Simplified0.0

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

  3. Final simplification0.0

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

Reproduce

herbie shell --seed 2022125 
(FPCore (x y)
  :name "Graphics.Rasterific.Linear:$cquadrance from Rasterific-0.6.1"
  :precision binary64
  (+ (* x x) (* y y)))