Average Error: 32.2 → 18.4
Time: 2.0s
Precision: 64
\[\sqrt{x \cdot x + y \cdot y}\]
↓
\[\begin{array}{l} \mathbf{if}\;x \le -4.2696195727379345 \cdot 10^{139}:\\ \;\;\;\;-x\\ \mathbf{elif}\;x \le -3.5543765182763856 \cdot 10^{-161}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{elif}\;x \le 2.2436091775473112 \cdot 10^{-248}:\\ \;\;\;\;y\\ \mathbf{elif}\;x \le 6.3015272029718245 \cdot 10^{96}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{else}:\\ \;\;\;\;x\\ \end{array}\]
\sqrt{x \cdot x + y \cdot y}
↓
\begin{array}{l}
\mathbf{if}\;x \le -4.2696195727379345 \cdot 10^{139}:\\
\;\;\;\;-x\\

\mathbf{elif}\;x \le -3.5543765182763856 \cdot 10^{-161}:\\
\;\;\;\;\sqrt{x \cdot x + y \cdot y}\\

\mathbf{elif}\;x \le 2.2436091775473112 \cdot 10^{-248}:\\
\;\;\;\;y\\

\mathbf{elif}\;x \le 6.3015272029718245 \cdot 10^{96}:\\
\;\;\;\;\sqrt{x \cdot x + y \cdot y}\\

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

\end{array}
double f(double x, double y) {
        double r802791 = x;
        double r802792 = r802791 * r802791;
        double r802793 = y;
        double r802794 = r802793 * r802793;
        double r802795 = r802792 + r802794;
        double r802796 = sqrt(r802795);
        return r802796;
}
↓
double f(double x, double y) {
        double r802797 = x;
        double r802798 = -4.2696195727379345e+139;
        bool r802799 = r802797 <= r802798;
        double r802800 = -r802797;
        double r802801 = -3.5543765182763856e-161;
        bool r802802 = r802797 <= r802801;
        double r802803 = r802797 * r802797;
        double r802804 = y;
        double r802805 = r802804 * r802804;
        double r802806 = r802803 + r802805;
        double r802807 = sqrt(r802806);
        double r802808 = 2.243609177547311e-248;
        bool r802809 = r802797 <= r802808;
        double r802810 = 6.3015272029718245e+96;
        bool r802811 = r802797 <= r802810;
        double r802812 = r802811 ? r802807 : r802797;
        double r802813 = r802809 ? r802804 : r802812;
        double r802814 = r802802 ? r802807 : r802813;
        double r802815 = r802799 ? r802800 : r802814;
        return r802815;
}

Error

Bits error versus x

Bits error versus y

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original32.2
Target18.2
Herbie18.4
\[\begin{array}{l} \mathbf{if}\;x \lt -1.123695082659983 \cdot 10^{145}:\\ \;\;\;\;-x\\ \mathbf{elif}\;x \lt 1.11655762118336204 \cdot 10^{93}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{else}:\\ \;\;\;\;x\\ \end{array}\]

Derivation

  1. Split input into 4 regimes

  2. if x < -4.2696195727379345e+139

    1. Initial program 59.5

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

    2. Taylor expanded around -inf 8.4

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

    3. Simplified8.4

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

    if -4.2696195727379345e+139 < x < -3.5543765182763856e-161 or 2.243609177547311e-248 < x < 6.3015272029718245e+96

    1. Initial program 18.8

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

    if -3.5543765182763856e-161 < x < 2.243609177547311e-248

    1. Initial program 32.3

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

    2. Taylor expanded around 0 33.8

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

    if 6.3015272029718245e+96 < x

    1. Initial program 51.2

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

    2. Taylor expanded around inf 10.7

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

  4. Final simplification18.4

    \[\leadsto \begin{array}{l} \mathbf{if}\;x \le -4.2696195727379345 \cdot 10^{139}:\\ \;\;\;\;-x\\ \mathbf{elif}\;x \le -3.5543765182763856 \cdot 10^{-161}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{elif}\;x \le 2.2436091775473112 \cdot 10^{-248}:\\ \;\;\;\;y\\ \mathbf{elif}\;x \le 6.3015272029718245 \cdot 10^{96}:\\ \;\;\;\;\sqrt{x \cdot x + y \cdot y}\\ \mathbf{else}:\\ \;\;\;\;x\\ \end{array}\]

Reproduce

herbie shell --seed 2020047 
(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))))