diff options
Diffstat (limited to 'math/s_catan.c')
| -rw-r--r-- | math/s_catan.c | 143 |
1 files changed, 0 insertions, 143 deletions
diff --git a/math/s_catan.c b/math/s_catan.c deleted file mode 100644 index 5ab4c0d635..0000000000 --- a/math/s_catan.c +++ /dev/null @@ -1,143 +0,0 @@ -/* Return arc tangent of complex double value. - Copyright (C) 1997-2016 Free Software Foundation, Inc. - This file is part of the GNU C Library. - 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> - -__complex__ double -__catan (__complex__ double x) -{ - __complex__ double res; - int rcls = fpclassify (__real__ x); - int icls = fpclassify (__imag__ x); - - if (__glibc_unlikely (rcls <= FP_INFINITE || icls <= FP_INFINITE)) - { - if (rcls == FP_INFINITE) - { - __real__ res = __copysign (M_PI_2, __real__ x); - __imag__ res = __copysign (0.0, __imag__ x); - } - else if (icls == FP_INFINITE) - { - if (rcls >= FP_ZERO) - __real__ res = __copysign (M_PI_2, __real__ x); - else - __real__ res = __nan (""); - __imag__ res = __copysign (0.0, __imag__ x); - } - else if (icls == FP_ZERO || icls == FP_INFINITE) - { - __real__ res = __nan (""); - __imag__ res = __copysign (0.0, __imag__ x); - } - else - { - __real__ res = __nan (""); - __imag__ res = __nan (""); - } - } - else if (__glibc_unlikely (rcls == FP_ZERO && icls == FP_ZERO)) - { - res = x; - } - else - { - if (fabs (__real__ x) >= 16.0 / DBL_EPSILON - || fabs (__imag__ x) >= 16.0 / DBL_EPSILON) - { - __real__ res = __copysign (M_PI_2, __real__ x); - if (fabs (__real__ x) <= 1.0) - __imag__ res = 1.0 / __imag__ x; - else if (fabs (__imag__ x) <= 1.0) - __imag__ res = __imag__ x / __real__ x / __real__ x; - else - { - double h = __ieee754_hypot (__real__ x / 2.0, __imag__ x / 2.0); - __imag__ res = __imag__ x / h / h / 4.0; - } - } - else - { - double den, absx, absy; - - absx = fabs (__real__ x); - absy = fabs (__imag__ x); - if (absx < absy) - { - double t = absx; - absx = absy; - absy = t; - } - - if (absy < DBL_EPSILON / 2.0) - { - den = (1.0 - absx) * (1.0 + absx); - if (den == -0.0) - den = 0.0; - } - else if (absx >= 1.0) - den = (1.0 - absx) * (1.0 + absx) - absy * absy; - else if (absx >= 0.75 || absy >= 0.5) - den = -__x2y2m1 (absx, absy); - else - den = (1.0 - absx) * (1.0 + absx) - absy * absy; - - __real__ res = 0.5 * __ieee754_atan2 (2.0 * __real__ x, den); - - if (fabs (__imag__ x) == 1.0 - && fabs (__real__ x) < DBL_EPSILON * DBL_EPSILON) - __imag__ res = (__copysign (0.5, __imag__ x) - * (M_LN2 - __ieee754_log (fabs (__real__ x)))); - else - { - double r2 = 0.0, num, f; - - if (fabs (__real__ x) >= DBL_EPSILON * DBL_EPSILON) - r2 = __real__ x * __real__ x; - - num = __imag__ x + 1.0; - num = r2 + num * num; - - den = __imag__ x - 1.0; - den = r2 + den * den; - - f = num / den; - if (f < 0.5) - __imag__ res = 0.25 * __ieee754_log (f); - else - { - num = 4.0 * __imag__ x; - __imag__ res = 0.25 * __log1p (num / den); - } - } - } - - math_check_force_underflow_complex (res); - } - - return res; -} -weak_alias (__catan, catan) -#ifdef NO_LONG_DOUBLE -strong_alias (__catan, __catanl) -weak_alias (__catan, catanl) -#endif |