Average Error: 38.6 → 8.2
Time: 4.0s
Precision: binary64
\[im > 0\]
\[0.5 \cdot \sqrt{2 \cdot \left(\sqrt{re \cdot re + im \cdot im} - re\right)} \]
↓
\[\begin{array}{l} t_0 := 0.5 \cdot \left(im \cdot {\left(0.5 \cdot \frac{2}{re}\right)}^{0.5}\right)\\ t_1 := 0.5 \cdot \sqrt{2 \cdot \left(\mathsf{hypot}\left(re, im\right) - re\right)}\\ \mathbf{if}\;re \leq 20927543.71443376:\\ \;\;\;\;t_1\\ \mathbf{elif}\;re \leq 5.086107668296354 \cdot 10^{+39}:\\ \;\;\;\;t_0\\ \mathbf{elif}\;re \leq 5.017610183842939 \cdot 10^{+115}:\\ \;\;\;\;t_1\\ \mathbf{else}:\\ \;\;\;\;t_0\\ \end{array} \]
(FPCore (re im)
 :precision binary64
 (* 0.5 (sqrt (* 2.0 (- (sqrt (+ (* re re) (* im im))) re)))))
↓
(FPCore (re im)
 :precision binary64
 (let* ((t_0 (* 0.5 (* im (pow (* 0.5 (/ 2.0 re)) 0.5))))
        (t_1 (* 0.5 (sqrt (* 2.0 (- (hypot re im) re))))))
   (if (<= re 20927543.71443376)
     t_1
     (if (<= re 5.086107668296354e+39)
       t_0
       (if (<= re 5.017610183842939e+115) t_1 t_0)))))
double code(double re, double im) {
	return 0.5 * sqrt((2.0 * (sqrt(((re * re) + (im * im))) - re)));
}
↓
double code(double re, double im) {
	double t_0 = 0.5 * (im * pow((0.5 * (2.0 / re)), 0.5));
	double t_1 = 0.5 * sqrt((2.0 * (hypot(re, im) - re)));
	double tmp;
	if (re <= 20927543.71443376) {
		tmp = t_1;
	} else if (re <= 5.086107668296354e+39) {
		tmp = t_0;
	} else if (re <= 5.017610183842939e+115) {
		tmp = t_1;
	} else {
		tmp = t_0;
	}
	return tmp;
}

public static double code(double re, double im) {
	return 0.5 * Math.sqrt((2.0 * (Math.sqrt(((re * re) + (im * im))) - re)));
}
↓
public static double code(double re, double im) {
	double t_0 = 0.5 * (im * Math.pow((0.5 * (2.0 / re)), 0.5));
	double t_1 = 0.5 * Math.sqrt((2.0 * (Math.hypot(re, im) - re)));
	double tmp;
	if (re <= 20927543.71443376) {
		tmp = t_1;
	} else if (re <= 5.086107668296354e+39) {
		tmp = t_0;
	} else if (re <= 5.017610183842939e+115) {
		tmp = t_1;
	} else {
		tmp = t_0;
	}
	return tmp;
}

def code(re, im):
	return 0.5 * math.sqrt((2.0 * (math.sqrt(((re * re) + (im * im))) - re)))
↓
def code(re, im):
	t_0 = 0.5 * (im * math.pow((0.5 * (2.0 / re)), 0.5))
	t_1 = 0.5 * math.sqrt((2.0 * (math.hypot(re, im) - re)))
	tmp = 0
	if re <= 20927543.71443376:
		tmp = t_1
	elif re <= 5.086107668296354e+39:
		tmp = t_0
	elif re <= 5.017610183842939e+115:
		tmp = t_1
	else:
		tmp = t_0
	return tmp

function code(re, im)
	return Float64(0.5 * sqrt(Float64(2.0 * Float64(sqrt(Float64(Float64(re * re) + Float64(im * im))) - re))))
end
↓
function code(re, im)
	t_0 = Float64(0.5 * Float64(im * (Float64(0.5 * Float64(2.0 / re)) ^ 0.5)))
	t_1 = Float64(0.5 * sqrt(Float64(2.0 * Float64(hypot(re, im) - re))))
	tmp = 0.0
	if (re <= 20927543.71443376)
		tmp = t_1;
	elseif (re <= 5.086107668296354e+39)
		tmp = t_0;
	elseif (re <= 5.017610183842939e+115)
		tmp = t_1;
	else
		tmp = t_0;
	end
	return tmp
end

function tmp = code(re, im)
	tmp = 0.5 * sqrt((2.0 * (sqrt(((re * re) + (im * im))) - re)));
end
↓
function tmp_2 = code(re, im)
	t_0 = 0.5 * (im * ((0.5 * (2.0 / re)) ^ 0.5));
	t_1 = 0.5 * sqrt((2.0 * (hypot(re, im) - re)));
	tmp = 0.0;
	if (re <= 20927543.71443376)
		tmp = t_1;
	elseif (re <= 5.086107668296354e+39)
		tmp = t_0;
	elseif (re <= 5.017610183842939e+115)
		tmp = t_1;
	else
		tmp = t_0;
	end
	tmp_2 = tmp;
end

code[re_, im_] := N[(0.5 * N[Sqrt[N[(2.0 * N[(N[Sqrt[N[(N[(re * re), $MachinePrecision] + N[(im * im), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] - re), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
↓
code[re_, im_] := Block[{t$95$0 = N[(0.5 * N[(im * N[Power[N[(0.5 * N[(2.0 / re), $MachinePrecision]), $MachinePrecision], 0.5], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]}, Block[{t$95$1 = N[(0.5 * N[Sqrt[N[(2.0 * N[(N[Sqrt[re ^ 2 + im ^ 2], $MachinePrecision] - re), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]}, If[LessEqual[re, 20927543.71443376], t$95$1, If[LessEqual[re, 5.086107668296354e+39], t$95$0, If[LessEqual[re, 5.017610183842939e+115], t$95$1, t$95$0]]]]]

0.5 \cdot \sqrt{2 \cdot \left(\sqrt{re \cdot re + im \cdot im} - re\right)}
↓
\begin{array}{l}
t_0 := 0.5 \cdot \left(im \cdot {\left(0.5 \cdot \frac{2}{re}\right)}^{0.5}\right)\\
t_1 := 0.5 \cdot \sqrt{2 \cdot \left(\mathsf{hypot}\left(re, im\right) - re\right)}\\
\mathbf{if}\;re \leq 20927543.71443376:\\
\;\;\;\;t_1\\

\mathbf{elif}\;re \leq 5.086107668296354 \cdot 10^{+39}:\\
\;\;\;\;t_0\\

\mathbf{elif}\;re \leq 5.017610183842939 \cdot 10^{+115}:\\
\;\;\;\;t_1\\

\mathbf{else}:\\
\;\;\;\;t_0\\


\end{array}

Error

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Split input into 2 regimes

  2. if re < 20927543.714433759 or 5.08610766829635412e39 < re < 5.01761018384293898e115

    1. Initial program 33.7

      \[0.5 \cdot \sqrt{2 \cdot \left(\sqrt{re \cdot re + im \cdot im} - re\right)} \]

    2. Simplified7.5

      \[\leadsto \color{blue}{0.5 \cdot \sqrt{2 \cdot \left(\mathsf{hypot}\left(re, im\right) - re\right)}} \]

    if 20927543.714433759 < re < 5.08610766829635412e39 or 5.01761018384293898e115 < re

    1. Initial program 59.8

      \[0.5 \cdot \sqrt{2 \cdot \left(\sqrt{re \cdot re + im \cdot im} - re\right)} \]

    2. Simplified41.0

      \[\leadsto \color{blue}{0.5 \cdot \sqrt{2 \cdot \left(\mathsf{hypot}\left(re, im\right) - re\right)}} \]

    3. Taylor expanded in im around 0 11.9

      \[\leadsto 0.5 \cdot \color{blue}{\left(\left(\sqrt{2} \cdot \left(\sqrt{0.5} \cdot im\right)\right) \cdot \sqrt{\frac{1}{re}}\right)} \]

    4. Simplified11.8

      \[\leadsto 0.5 \cdot \color{blue}{\left(\sqrt{0.5} \cdot \left(im \cdot \left(\sqrt{2} \cdot \sqrt{\frac{1}{re}}\right)\right)\right)} \]

    5. Applied egg-rr11.4

      \[\leadsto 0.5 \cdot \color{blue}{\left(0 + im \cdot {\left(\frac{2}{re} \cdot 0.5\right)}^{0.5}\right)} \]
  3. Recombined 2 regimes into one program.

  4. Final simplification8.2

    \[\leadsto \begin{array}{l} \mathbf{if}\;re \leq 20927543.71443376:\\ \;\;\;\;0.5 \cdot \sqrt{2 \cdot \left(\mathsf{hypot}\left(re, im\right) - re\right)}\\ \mathbf{elif}\;re \leq 5.086107668296354 \cdot 10^{+39}:\\ \;\;\;\;0.5 \cdot \left(im \cdot {\left(0.5 \cdot \frac{2}{re}\right)}^{0.5}\right)\\ \mathbf{elif}\;re \leq 5.017610183842939 \cdot 10^{+115}:\\ \;\;\;\;0.5 \cdot \sqrt{2 \cdot \left(\mathsf{hypot}\left(re, im\right) - re\right)}\\ \mathbf{else}:\\ \;\;\;\;0.5 \cdot \left(im \cdot {\left(0.5 \cdot \frac{2}{re}\right)}^{0.5}\right)\\ \end{array} \]

Reproduce

herbie shell --seed 2022209 
(FPCore (re im)
  :name "math.sqrt on complex, imaginary part, im greater than 0 branch"
  :precision binary64
  :pre (> im 0.0)
  (* 0.5 (sqrt (* 2.0 (- (sqrt (+ (* re re) (* im im))) re)))))