Average Error: 0 → 0
Time: 463.0ms
Precision: binary64
\[2 \cdot \left|x\right| - 1\]
↓
\[2 \cdot \left|x\right| - 1\]
2 \cdot \left|x\right| - 1
↓
2 \cdot \left|x\right| - 1
double code(double x) {
	return ((double) (((double) (2.0 * ((double) fabs(x)))) - 1.0));
}
↓
double code(double x) {
	return ((double) (((double) (2.0 * ((double) fabs(x)))) - 1.0));
}

Error

Bits error versus x

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 0

    \[2 \cdot \left|x\right| - 1\]

  2. Final simplification0

    \[\leadsto 2 \cdot \left|x\right| - 1\]

Reproduce

herbie shell --seed 2020152 
(FPCore (x)
  :name "(- (* 2 (fabs x)) 1)"
  :precision binary64
  (- (* 2.0 (fabs x)) 1.0))