1 | /* Return cosine of a complex type. |
2 | Copyright (C) 1997-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <complex.h> |
20 | #include <math.h> |
21 | |
22 | CFLOAT |
23 | M_DECL_FUNC (__cacos) (CFLOAT x) |
24 | { |
25 | CFLOAT y; |
26 | CFLOAT res; |
27 | int rcls = fpclassify (__real__ x); |
28 | int icls = fpclassify (__imag__ x); |
29 | |
30 | if (rcls <= FP_INFINITE || icls <= FP_INFINITE |
31 | || (rcls == FP_ZERO && icls == FP_ZERO)) |
32 | { |
33 | y = M_SUF (__casin) (x); |
34 | |
35 | __real__ res = M_MLIT (M_PI_2) - __real__ y; |
36 | if (__real__ res == 0) |
37 | __real__ res = 0; |
38 | __imag__ res = -__imag__ y; |
39 | } |
40 | else |
41 | { |
42 | __real__ y = -__imag__ x; |
43 | __imag__ y = __real__ x; |
44 | |
45 | y = M_SUF (__kernel_casinh) (y, 1); |
46 | |
47 | __real__ res = __imag__ y; |
48 | __imag__ res = __real__ y; |
49 | } |
50 | |
51 | return res; |
52 | } |
53 | |
54 | declare_mgen_alias (__cacos, cacos); |
55 | |