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Diffstat (limited to 'math/s_csqrt.c')
| -rw-r--r-- | math/s_csqrt.c | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/math/s_csqrt.c b/math/s_csqrt.c deleted file mode 100644 index 04ed410a16..0000000000 --- a/math/s_csqrt.c +++ /dev/null @@ -1,114 +0,0 @@ -/* Complex square root of double value. - Copyright (C) 1997, 1998, 2005 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Based on an algorithm by Stephen L. Moshier <moshier@world.std.com>. - Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#include <complex.h> -#include <math.h> - -#include "math_private.h" - - -__complex__ double -__csqrt (__complex__ double x) -{ - __complex__ double res; - int rcls = fpclassify (__real__ x); - int icls = fpclassify (__imag__ x); - - if (rcls <= FP_INFINITE || icls <= FP_INFINITE) - { - if (icls == FP_INFINITE) - { - __real__ res = HUGE_VAL; - __imag__ res = __imag__ x; - } - else if (rcls == FP_INFINITE) - { - if (__real__ x < 0.0) - { - __real__ res = icls == FP_NAN ? __nan ("") : 0; - __imag__ res = __copysign (HUGE_VAL, __imag__ x); - } - else - { - __real__ res = __real__ x; - __imag__ res = (icls == FP_NAN - ? __nan ("") : __copysign (0.0, __imag__ x)); - } - } - else - { - __real__ res = __nan (""); - __imag__ res = __nan (""); - } - } - else - { - if (icls == FP_ZERO) - { - if (__real__ x < 0.0) - { - __real__ res = 0.0; - __imag__ res = __copysign (__ieee754_sqrt (-__real__ x), - __imag__ x); - } - else - { - __real__ res = fabs (__ieee754_sqrt (__real__ x)); - __imag__ res = __copysign (0.0, __imag__ x); - } - } - else if (rcls == FP_ZERO) - { - double r = __ieee754_sqrt (0.5 * fabs (__imag__ x)); - - __real__ res = r; - __imag__ res = __copysign (r, __imag__ x); - } - else - { - double d, r, s; - - d = __ieee754_hypot (__real__ x, __imag__ x); - /* Use the identity 2 Re res Im res = Im x - to avoid cancellation error in d +/- Re x. */ - if (__real__ x > 0) - { - r = __ieee754_sqrt (0.5 * d + 0.5 * __real__ x); - s = (0.5 * __imag__ x) / r; - } - else - { - s = __ieee754_sqrt (0.5 * d - 0.5 * __real__ x); - r = fabs ((0.5 * __imag__ x) / s); - } - - __real__ res = r; - __imag__ res = __copysign (s, __imag__ x); - } - } - - return res; -} -weak_alias (__csqrt, csqrt) -#ifdef NO_LONG_DOUBLE -strong_alias (__csqrt, __csqrtl) -weak_alias (__csqrt, csqrtl) -#endif |