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Diffstat (limited to 'math/s_csqrt_template.c')
| -rw-r--r-- | math/s_csqrt_template.c | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/math/s_csqrt_template.c b/math/s_csqrt_template.c deleted file mode 100644 index 69cf77c15c..0000000000 --- a/math/s_csqrt_template.c +++ /dev/null @@ -1,164 +0,0 @@ -/* Complex square root of a float type. - Copyright (C) 1997-2017 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, see - <http://www.gnu.org/licenses/>. */ - -#include <complex.h> -#include <math.h> -#include <math_private.h> -#include <float.h> - -CFLOAT -M_DECL_FUNC (__csqrt) (CFLOAT x) -{ - CFLOAT res; - int rcls = fpclassify (__real__ x); - int icls = fpclassify (__imag__ x); - - if (__glibc_unlikely (rcls <= FP_INFINITE || icls <= FP_INFINITE)) - { - if (icls == FP_INFINITE) - { - __real__ res = M_HUGE_VAL; - __imag__ res = __imag__ x; - } - else if (rcls == FP_INFINITE) - { - if (__real__ x < 0) - { - __real__ res = icls == FP_NAN ? M_NAN : 0; - __imag__ res = M_COPYSIGN (M_HUGE_VAL, __imag__ x); - } - else - { - __real__ res = __real__ x; - __imag__ res = (icls == FP_NAN - ? M_NAN : M_COPYSIGN (0, __imag__ x)); - } - } - else - { - __real__ res = M_NAN; - __imag__ res = M_NAN; - } - } - else - { - if (__glibc_unlikely (icls == FP_ZERO)) - { - if (__real__ x < 0) - { - __real__ res = 0; - __imag__ res = M_COPYSIGN (M_SQRT (-__real__ x), __imag__ x); - } - else - { - __real__ res = M_FABS (M_SQRT (__real__ x)); - __imag__ res = M_COPYSIGN (0, __imag__ x); - } - } - else if (__glibc_unlikely (rcls == FP_ZERO)) - { - FLOAT r; - if (M_FABS (__imag__ x) >= 2 * M_MIN) - r = M_SQRT (M_LIT (0.5) * M_FABS (__imag__ x)); - else - r = M_LIT (0.5) * M_SQRT (2 * M_FABS (__imag__ x)); - - __real__ res = r; - __imag__ res = M_COPYSIGN (r, __imag__ x); - } - else - { - FLOAT d, r, s; - int scale = 0; - - if (M_FABS (__real__ x) > M_MAX / 4) - { - scale = 1; - __real__ x = M_SCALBN (__real__ x, -2 * scale); - __imag__ x = M_SCALBN (__imag__ x, -2 * scale); - } - else if (M_FABS (__imag__ x) > M_MAX / 4) - { - scale = 1; - if (M_FABS (__real__ x) >= 4 * M_MIN) - __real__ x = M_SCALBN (__real__ x, -2 * scale); - else - __real__ x = 0; - __imag__ x = M_SCALBN (__imag__ x, -2 * scale); - } - else if (M_FABS (__real__ x) < 2 * M_MIN - && M_FABS (__imag__ x) < 2 * M_MIN) - { - scale = -((M_MANT_DIG + 1) / 2); - __real__ x = M_SCALBN (__real__ x, -2 * scale); - __imag__ x = M_SCALBN (__imag__ x, -2 * scale); - } - - d = M_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 = M_SQRT (M_LIT (0.5) * (d + __real__ x)); - if (scale == 1 && M_FABS (__imag__ x) < 1) - { - /* Avoid possible intermediate underflow. */ - s = __imag__ x / r; - r = M_SCALBN (r, scale); - scale = 0; - } - else - s = M_LIT (0.5) * (__imag__ x / r); - } - else - { - s = M_SQRT (M_LIT (0.5) * (d - __real__ x)); - if (scale == 1 && M_FABS (__imag__ x) < 1) - { - /* Avoid possible intermediate underflow. */ - r = M_FABS (__imag__ x / s); - s = M_SCALBN (s, scale); - scale = 0; - } - else - r = M_FABS (M_LIT (0.5) * (__imag__ x / s)); - } - - if (scale) - { - r = M_SCALBN (r, scale); - s = M_SCALBN (s, scale); - } - - math_check_force_underflow (r); - math_check_force_underflow (s); - - __real__ res = r; - __imag__ res = M_COPYSIGN (s, __imag__ x); - } - } - - return res; -} -declare_mgen_alias (__csqrt, csqrt) - -#if M_LIBM_NEED_COMPAT (csqrt) -declare_mgen_libm_compat (__csqrt, csqrt) -#endif |