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01ee3870 | 1 | /* Return cosine of a complex type. |
04277e02 | 2 | Copyright (C) 1997-2019 Free Software Foundation, Inc. |
281f5073 PM |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <complex.h> | |
21 | #include <math.h> | |
22 | ||
01ee3870 PM |
23 | CFLOAT |
24 | M_DECL_FUNC (__cacos) (CFLOAT x) | |
281f5073 | 25 | { |
01ee3870 PM |
26 | CFLOAT y; |
27 | CFLOAT res; | |
281f5073 PM |
28 | int rcls = fpclassify (__real__ x); |
29 | int icls = fpclassify (__imag__ x); | |
30 | ||
31 | if (rcls <= FP_INFINITE || icls <= FP_INFINITE | |
32 | || (rcls == FP_ZERO && icls == FP_ZERO)) | |
33 | { | |
01ee3870 | 34 | y = M_SUF (__casin) (x); |
281f5073 | 35 | |
01ee3870 PM |
36 | __real__ res = (FLOAT) M_MLIT (M_PI_2) - __real__ y; |
37 | if (__real__ res == 0) | |
38 | __real__ res = 0; | |
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39 | __imag__ res = -__imag__ y; |
40 | } | |
41 | else | |
42 | { | |
43 | __real__ y = -__imag__ x; | |
44 | __imag__ y = __real__ x; | |
45 | ||
01ee3870 | 46 | y = M_SUF (__kernel_casinh) (y, 1); |
281f5073 PM |
47 | |
48 | __real__ res = __imag__ y; | |
49 | __imag__ res = __real__ y; | |
50 | } | |
51 | ||
52 | return res; | |
53 | } | |
01ee3870 PM |
54 | |
55 | declare_mgen_alias (__cacos, cacos); |