Average Error: 37.7 → 13.1
Time: 8.3s
Precision: binary64
\[[x, y, z]=\mathsf{sort}([x, y, z])\]
\[\sqrt{\left(x \cdot x + y \cdot y\right) + z \cdot z}\]
↓
\[\begin{array}{l} \mathbf{if}\;x \leq -4.267352581954492 \cdot 10^{+64}:\\ \;\;\;\;-x\\ \mathbf{elif}\;x \leq -6.690921691928078 \cdot 10^{-08}:\\ \;\;\;\;z\\ \mathbf{elif}\;x \leq -1.5083184111055833 \cdot 10^{-113}:\\ \;\;\;\;\sqrt{\left(x \cdot x + y \cdot y\right) + z \cdot z}\\ \mathbf{else}:\\ \;\;\;\;z\\ \end{array}\]
\sqrt{\left(x \cdot x + y \cdot y\right) + z \cdot z}
↓
\begin{array}{l}
\mathbf{if}\;x \leq -4.267352581954492 \cdot 10^{+64}:\\
\;\;\;\;-x\\

\mathbf{elif}\;x \leq -6.690921691928078 \cdot 10^{-08}:\\
\;\;\;\;z\\

\mathbf{elif}\;x \leq -1.5083184111055833 \cdot 10^{-113}:\\
\;\;\;\;\sqrt{\left(x \cdot x + y \cdot y\right) + z \cdot z}\\

\mathbf{else}:\\
\;\;\;\;z\\

\end{array}
(FPCore (x y z) :precision binary64 (sqrt (+ (+ (* x x) (* y y)) (* z z))))
↓
(FPCore (x y z)
 :precision binary64
 (if (<= x -4.267352581954492e+64)
   (- x)
   (if (<= x -6.690921691928078e-08)
     z
     (if (<= x -1.5083184111055833e-113)
       (sqrt (+ (+ (* x x) (* y y)) (* z z)))
       z))))
double code(double x, double y, double z) {
	return sqrt(((x * x) + (y * y)) + (z * z));
}
↓
double code(double x, double y, double z) {
	double tmp;
	if (x <= -4.267352581954492e+64) {
		tmp = -x;
	} else if (x <= -6.690921691928078e-08) {
		tmp = z;
	} else if (x <= -1.5083184111055833e-113) {
		tmp = sqrt(((x * x) + (y * y)) + (z * z));
	} else {
		tmp = z;
	}
	return tmp;
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original37.7
Target19.0
Herbie13.1
\[\begin{array}{l} \mathbf{if}\;z < -6.396479394109776 \cdot 10^{+136}:\\ \;\;\;\;-z\\ \mathbf{elif}\;z < 7.320293694404182 \cdot 10^{+117}:\\ \;\;\;\;\sqrt{\left(z \cdot z + x \cdot x\right) + y \cdot y}\\ \mathbf{else}:\\ \;\;\;\;z\\ \end{array}\]

Derivation

  1. Split input into 3 regimes

  2. if x < -4.26735258195449174e64

    1. Initial program 48.9

      \[\sqrt{\left(x \cdot x + y \cdot y\right) + z \cdot z}\]

    2. Taylor expanded around -inf 12.8

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

    if -4.26735258195449174e64 < x < -6.6909216919280778e-8 or -1.50831841110558333e-113 < x

    1. Initial program 29.7

      \[\sqrt{\left(x \cdot x + y \cdot y\right) + z \cdot z}\]

    2. Taylor expanded around inf 11.2

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

    if -6.6909216919280778e-8 < x < -1.50831841110558333e-113

    1. Initial program 20.1

      \[\sqrt{\left(x \cdot x + y \cdot y\right) + z \cdot z}\]
  3. Recombined 3 regimes into one program.

  4. Final simplification13.1

    \[\leadsto \begin{array}{l} \mathbf{if}\;x \leq -4.267352581954492 \cdot 10^{+64}:\\ \;\;\;\;-x\\ \mathbf{elif}\;x \leq -6.690921691928078 \cdot 10^{-08}:\\ \;\;\;\;z\\ \mathbf{elif}\;x \leq -1.5083184111055833 \cdot 10^{-113}:\\ \;\;\;\;\sqrt{\left(x \cdot x + y \cdot y\right) + z \cdot z}\\ \mathbf{else}:\\ \;\;\;\;z\\ \end{array}\]

Reproduce

herbie shell --seed 2021027 
(FPCore (x y z)
  :name "FRP.Yampa.Vector3:vector3Rho from Yampa-0.10.2"
  :precision binary64

  :herbie-target
  (if (< z -6.396479394109776e+136) (- z) (if (< z 7.320293694404182e+117) (sqrt (+ (+ (* z z) (* x x)) (* y y))) z))

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