Average Error: 31.4 → 18.6
Time: 1.1s
Precision: 64
\[\sqrt{x \cdot x + y \cdot y}\]
↓
\[\begin{array}{l} \mathbf{if}\;x \le -3.27537247696563 \cdot 10^{153}:\\ \;\;\;\;-1 \cdot x\\ \mathbf{elif}\;x \le 2.2924281419668697 \cdot 10^{-214}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{elif}\;x \le 2.6090358084209792 \cdot 10^{-164}:\\ \;\;\;\;x\\ \mathbf{elif}\;x \le 1.7416632839055967 \cdot 10^{79}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{else}:\\ \;\;\;\;x\\ \end{array}\]
\sqrt{x \cdot x + y \cdot y}
↓
\begin{array}{l}
\mathbf{if}\;x \le -3.27537247696563 \cdot 10^{153}:\\
\;\;\;\;-1 \cdot x\\

\mathbf{elif}\;x \le 2.2924281419668697 \cdot 10^{-214}:\\
\;\;\;\;\sqrt{x \cdot x + y \cdot y}\\

\mathbf{elif}\;x \le 2.6090358084209792 \cdot 10^{-164}:\\
\;\;\;\;x\\

\mathbf{elif}\;x \le 1.7416632839055967 \cdot 10^{79}:\\
\;\;\;\;\sqrt{x \cdot x + y \cdot y}\\

\mathbf{else}:\\
\;\;\;\;x\\

\end{array}
double code(double x, double y) {
	return ((double) sqrt(((double) (((double) (x * x)) + ((double) (y * y))))));
}
↓
double code(double x, double y) {
	double VAR;
	if ((x <= -3.27537247696563e+153)) {
		VAR = ((double) (-1.0 * x));
	} else {
		double VAR_1;
		if ((x <= 2.2924281419668697e-214)) {
			VAR_1 = ((double) sqrt(((double) (((double) (x * x)) + ((double) (y * y))))));
		} else {
			double VAR_2;
			if ((x <= 2.609035808420979e-164)) {
				VAR_2 = x;
			} else {
				double VAR_3;
				if ((x <= 1.7416632839055967e+79)) {
					VAR_3 = ((double) sqrt(((double) (((double) (x * x)) + ((double) (y * y))))));
				} else {
					VAR_3 = x;
				}
				VAR_2 = VAR_3;
			}
			VAR_1 = VAR_2;
		}
		VAR = VAR_1;
	}
	return VAR;
}

Error

Bits error versus x

Bits error versus y

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original31.4
Target17.8
Herbie18.6
\[\begin{array}{l} \mathbf{if}\;x \lt -1.123695082659983 \cdot 10^{145}:\\ \;\;\;\;-x\\ \mathbf{elif}\;x \lt 1.11655762118336204 \cdot 10^{93}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{else}:\\ \;\;\;\;x\\ \end{array}\]

Derivation

  1. Split input into 3 regimes

  2. if x < -3.27537247696563e+153

    1. Initial program 63.9

      \[\sqrt{x \cdot x + y \cdot y}\]

    2. Taylor expanded around -inf 8.9

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

    if -3.27537247696563e+153 < x < 2.2924281419668697e-214 or 2.609035808420979e-164 < x < 1.7416632839055967e+79

    1. Initial program 20.4

      \[\sqrt{x \cdot x + y \cdot y}\]

    if 2.2924281419668697e-214 < x < 2.609035808420979e-164 or 1.7416632839055967e+79 < x

    1. Initial program 45.3

      \[\sqrt{x \cdot x + y \cdot y}\]

    2. Taylor expanded around inf 18.7

      \[\leadsto \color{blue}{x}\]
  3. Recombined 3 regimes into one program.

  4. Final simplification18.6

    \[\leadsto \begin{array}{l} \mathbf{if}\;x \le -3.27537247696563 \cdot 10^{153}:\\ \;\;\;\;-1 \cdot x\\ \mathbf{elif}\;x \le 2.2924281419668697 \cdot 10^{-214}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{elif}\;x \le 2.6090358084209792 \cdot 10^{-164}:\\ \;\;\;\;x\\ \mathbf{elif}\;x \le 1.7416632839055967 \cdot 10^{79}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{else}:\\ \;\;\;\;x\\ \end{array}\]

Reproduce

herbie shell --seed 2020122 
(FPCore (x y)
  :name "Data.Octree.Internal:octantDistance  from Octree-0.5.4.2"
  :precision binary64

  :herbie-target
  (if (< x -1.123695082659983e+145) (- x) (if (< x 1.116557621183362e+93) (sqrt (+ (* x x) (* y y))) x))

  (sqrt (+ (* x x) (* y y))))