]>
Commit | Line | Data |
---|---|---|
e409716d | 1 | /* Return arc hyperbolic cosine for 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 | ||
b12676a5 | 22 | __complex128 |
23 | cacoshq (__complex128 x) | |
24 | { | |
25 | __complex128 res; | |
26 | int rcls = fpclassifyq (__real__ x); | |
27 | int icls = fpclassifyq (__imag__ x); | |
28 | ||
29 | if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE) | |
30 | { | |
31 | if (icls == QUADFP_INFINITE) | |
32 | { | |
33 | __real__ res = HUGE_VALQ; | |
34 | ||
35 | if (rcls == QUADFP_NAN) | |
36 | __imag__ res = nanq (""); | |
37 | else | |
38 | __imag__ res = copysignq ((rcls == QUADFP_INFINITE | |
e409716d | 39 | ? (__real__ x < 0 |
40 | ? M_PIq - M_PI_4q | |
41 | : M_PI_4q) | |
42 | : M_PI_2q), __imag__ x); | |
b12676a5 | 43 | } |
44 | else if (rcls == QUADFP_INFINITE) | |
45 | { | |
46 | __real__ res = HUGE_VALQ; | |
47 | ||
48 | if (icls >= QUADFP_ZERO) | |
e409716d | 49 | __imag__ res = copysignq (signbitq (__real__ x) |
50 | ? M_PIq : 0, __imag__ x); | |
b12676a5 | 51 | else |
52 | __imag__ res = nanq (""); | |
53 | } | |
54 | else | |
55 | { | |
56 | __real__ res = nanq (""); | |
e409716d | 57 | if (rcls == QUADFP_ZERO) |
58 | __imag__ res = M_PI_2q; | |
59 | else | |
60 | __imag__ res = nanq (""); | |
b12676a5 | 61 | } |
62 | } | |
63 | else if (rcls == QUADFP_ZERO && icls == QUADFP_ZERO) | |
64 | { | |
e409716d | 65 | __real__ res = 0; |
b12676a5 | 66 | __imag__ res = copysignq (M_PI_2q, __imag__ x); |
67 | } | |
68 | else | |
69 | { | |
70 | __complex128 y; | |
71 | ||
e409716d | 72 | __real__ y = -__imag__ x; |
73 | __imag__ y = __real__ x; | |
b12676a5 | 74 | |
e409716d | 75 | y = __quadmath_kernel_casinhq (y, 1); |
b12676a5 | 76 | |
e409716d | 77 | if (signbitq (__imag__ x)) |
78 | { | |
79 | __real__ res = __real__ y; | |
80 | __imag__ res = -__imag__ y; | |
81 | } | |
82 | else | |
83 | { | |
84 | __real__ res = -__real__ y; | |
85 | __imag__ res = __imag__ y; | |
86 | } | |
b12676a5 | 87 | } |
88 | ||
89 | return res; | |
90 | } |