Average Error: 31.0 → 18.1
Time: 2.9s
Precision: 64
\[\sqrt{x \cdot x + y \cdot y}\]
↓
\[\begin{array}{l} \mathbf{if}\;x \le -1.42682394536003885 \cdot 10^{82}:\\ \;\;\;\;-1 \cdot x\\ \mathbf{elif}\;x \le 4.74998232531126355 \cdot 10^{-281}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{elif}\;x \le 1.8637666906269956 \cdot 10^{-113}:\\ \;\;\;\;y\\ \mathbf{elif}\;x \le 2.1318584300381151 \cdot 10^{127}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{else}:\\ \;\;\;\;x\\ \end{array}\]
\sqrt{x \cdot x + y \cdot y}
↓
\begin{array}{l}
\mathbf{if}\;x \le -1.42682394536003885 \cdot 10^{82}:\\
\;\;\;\;-1 \cdot x\\

\mathbf{elif}\;x \le 4.74998232531126355 \cdot 10^{-281}:\\
\;\;\;\;\sqrt{x \cdot x + y \cdot y}\\

\mathbf{elif}\;x \le 1.8637666906269956 \cdot 10^{-113}:\\
\;\;\;\;y\\

\mathbf{elif}\;x \le 2.1318584300381151 \cdot 10^{127}:\\
\;\;\;\;\sqrt{x \cdot x + y \cdot y}\\

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

\end{array}
double code(double x, double y) {
	return sqrt(((x * x) + (y * y)));
}
↓
double code(double x, double y) {
	double VAR;
	if ((x <= -1.4268239453600389e+82)) {
		VAR = (-1.0 * x);
	} else {
		double VAR_1;
		if ((x <= 4.7499823253112636e-281)) {
			VAR_1 = sqrt(((x * x) + (y * y)));
		} else {
			double VAR_2;
			if ((x <= 1.8637666906269956e-113)) {
				VAR_2 = y;
			} else {
				double VAR_3;
				if ((x <= 2.131858430038115e+127)) {
					VAR_3 = sqrt(((x * x) + (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

Original31.0
Target16.9
Herbie18.1
\[\begin{array}{l} \mathbf{if}\;x \lt -1.123695082659983 \cdot 10^{145}:\\ \;\;\;\;-x\\ \mathbf{elif}\;x \lt 1.11655762118336204 \cdot 10^{93}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{else}:\\ \;\;\;\;x\\ \end{array}\]

Derivation

  1. Split input into 4 regimes

  2. if x < -1.4268239453600389e+82

    1. Initial program 47.7

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

    2. Taylor expanded around -inf 10.7

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

    if -1.4268239453600389e+82 < x < 4.7499823253112636e-281 or 1.8637666906269956e-113 < x < 2.131858430038115e+127

    1. Initial program 19.0

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

    if 4.7499823253112636e-281 < x < 1.8637666906269956e-113

    1. Initial program 26.9

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

    2. Taylor expanded around 0 35.3

      \[\leadsto \color{blue}{y}\]

    if 2.131858430038115e+127 < x

    1. Initial program 57.3

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

    2. Taylor expanded around inf 8.2

      \[\leadsto \color{blue}{x}\]
  3. Recombined 4 regimes into one program.

  4. Final simplification18.1

    \[\leadsto \begin{array}{l} \mathbf{if}\;x \le -1.42682394536003885 \cdot 10^{82}:\\ \;\;\;\;-1 \cdot x\\ \mathbf{elif}\;x \le 4.74998232531126355 \cdot 10^{-281}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{elif}\;x \le 1.8637666906269956 \cdot 10^{-113}:\\ \;\;\;\;y\\ \mathbf{elif}\;x \le 2.1318584300381151 \cdot 10^{127}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{else}:\\ \;\;\;\;x\\ \end{array}\]

Reproduce

herbie shell --seed 2020106 
(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))))