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e409716d | 1 | /* Return cosine of a complex type. |
2 | Copyright (C) 1997-2018 Free Software Foundation, Inc. | |
b12676a5 | 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 | |
e409716d | 17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
b12676a5 | 19 | |
20 | #include "quadmath-imp.h" | |
21 | ||
22 | __complex128 | |
23 | cacosq (__complex128 x) | |
24 | { | |
25 | __complex128 y; | |
26 | __complex128 res; | |
e409716d | 27 | int rcls = fpclassifyq (__real__ x); |
28 | int icls = fpclassifyq (__imag__ x); | |
29 | ||
30 | if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE | |
31 | || (rcls == QUADFP_ZERO && icls == QUADFP_ZERO)) | |
32 | { | |
33 | y = casinq (x); | |
34 | ||
35 | __real__ res = (__float128) M_PI_2q - __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 = __quadmath_kernel_casinhq (y, 1); | |
46 | ||
47 | __real__ res = __imag__ y; | |
48 | __imag__ res = __real__ y; | |
49 | } | |
b12676a5 | 50 | |
51 | return res; | |
52 | } |