Average Error: 30.6 → 0.3
Time: 1.5s
Precision: binary64
\[\sqrt{\left(2 \cdot x\right) \cdot x}\]
↓
\[\begin{array}{l} \mathbf{if}\;x \leq -3.93687171104557 \cdot 10^{-310}:\\ \;\;\;\;-\left(x \cdot {\left(\sqrt{\sqrt{2}}\right)}^{1.5}\right) \cdot \sqrt{\sqrt{\sqrt{2}}}\\ \mathbf{else}:\\ \;\;\;\;\sqrt{x \cdot 2} \cdot \sqrt{x}\\ \end{array}\]
\sqrt{\left(2 \cdot x\right) \cdot x}
↓
\begin{array}{l}
\mathbf{if}\;x \leq -3.93687171104557 \cdot 10^{-310}:\\
\;\;\;\;-\left(x \cdot {\left(\sqrt{\sqrt{2}}\right)}^{1.5}\right) \cdot \sqrt{\sqrt{\sqrt{2}}}\\

\mathbf{else}:\\
\;\;\;\;\sqrt{x \cdot 2} \cdot \sqrt{x}\\

\end{array}
(FPCore (x) :precision binary64 (sqrt (* (* 2.0 x) x)))
↓
(FPCore (x)
 :precision binary64
 (if (<= x -3.93687171104557e-310)
   (- (* (* x (pow (sqrt (sqrt 2.0)) 1.5)) (sqrt (sqrt (sqrt 2.0)))))
   (* (sqrt (* x 2.0)) (sqrt x))))
double code(double x) {
	return sqrt((2.0 * x) * x);
}
↓
double code(double x) {
	double tmp;
	if (x <= -3.93687171104557e-310) {
		tmp = -((x * pow(sqrt(sqrt(2.0)), 1.5)) * sqrt(sqrt(sqrt(2.0))));
	} else {
		tmp = sqrt(x * 2.0) * sqrt(x);
	}
	return tmp;
}

Error

Bits error versus x

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Split input into 2 regimes

  2. if x < -3.936871711045566e-310

    1. Initial program 31.4

      \[\sqrt{\left(2 \cdot x\right) \cdot x}\]

    2. Taylor expanded around -inf 0.4

      \[\leadsto \color{blue}{-1 \cdot \left(x \cdot \sqrt{2}\right)}\]

    3. Simplified0.4

      \[\leadsto \color{blue}{-x \cdot \sqrt{2}}\]
    4. Using strategy rm

    5. Applied add-sqr-sqrt_binary640.6

      \[\leadsto -x \cdot \color{blue}{\left(\sqrt{\sqrt{2}} \cdot \sqrt{\sqrt{2}}\right)}\]

    6. Applied associate-*r*_binary640.4

      \[\leadsto -\color{blue}{\left(x \cdot \sqrt{\sqrt{2}}\right) \cdot \sqrt{\sqrt{2}}}\]
    7. Using strategy rm

    8. Applied add-sqr-sqrt_binary640.4

      \[\leadsto -\left(x \cdot \sqrt{\sqrt{2}}\right) \cdot \color{blue}{\left(\sqrt{\sqrt{\sqrt{2}}} \cdot \sqrt{\sqrt{\sqrt{2}}}\right)}\]

    9. Applied associate-*r*_binary640.4

      \[\leadsto -\color{blue}{\left(\left(x \cdot \sqrt{\sqrt{2}}\right) \cdot \sqrt{\sqrt{\sqrt{2}}}\right) \cdot \sqrt{\sqrt{\sqrt{2}}}}\]

    10. Simplified0.3

      \[\leadsto -\color{blue}{\left(x \cdot {\left(\sqrt{\sqrt{2}}\right)}^{1.5}\right)} \cdot \sqrt{\sqrt{\sqrt{2}}}\]

    if -3.936871711045566e-310 < x

    1. Initial program 29.9

      \[\sqrt{\left(2 \cdot x\right) \cdot x}\]
    2. Using strategy rm

    3. Applied sqrt-prod_binary640.3

      \[\leadsto \color{blue}{\sqrt{2 \cdot x} \cdot \sqrt{x}}\]
  3. Recombined 2 regimes into one program.

  4. Final simplification0.3

    \[\leadsto \begin{array}{l} \mathbf{if}\;x \leq -3.93687171104557 \cdot 10^{-310}:\\ \;\;\;\;-\left(x \cdot {\left(\sqrt{\sqrt{2}}\right)}^{1.5}\right) \cdot \sqrt{\sqrt{\sqrt{2}}}\\ \mathbf{else}:\\ \;\;\;\;\sqrt{x \cdot 2} \cdot \sqrt{x}\\ \end{array}\]

Reproduce

herbie shell --seed 2020233 
(FPCore (x)
  :name "sqrt B"
  :precision binary64
  (sqrt (* (* 2.0 x) x)))