| /* Return cosine of a complex type. |
| Copyright (C) 1997-2018 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> |
| |
| CFLOAT |
| M_DECL_FUNC (__cacos) (CFLOAT x) |
| { |
| CFLOAT y; |
| CFLOAT res; |
| int rcls = fpclassify (__real__ x); |
| int icls = fpclassify (__imag__ x); |
| |
| if (rcls <= FP_INFINITE || icls <= FP_INFINITE |
| || (rcls == FP_ZERO && icls == FP_ZERO)) |
| { |
| y = M_SUF (__casin) (x); |
| |
| __real__ res = (FLOAT) M_MLIT (M_PI_2) - __real__ y; |
| if (__real__ res == 0) |
| __real__ res = 0; |
| __imag__ res = -__imag__ y; |
| } |
| else |
| { |
| __real__ y = -__imag__ x; |
| __imag__ y = __real__ x; |
| |
| y = M_SUF (__kernel_casinh) (y, 1); |
| |
| __real__ res = __imag__ y; |
| __imag__ res = __real__ y; |
| } |
| |
| return res; |
| } |
| |
| declare_mgen_alias (__cacos, cacos); |