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01ee3870 | 1 | /* Return arc hyperbolic cosine for a complex type. |
bfff8b1b | 2 | Copyright (C) 1997-2017 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 | #include <math_private.h> | |
23 | ||
24 | ||
01ee3870 PM |
25 | CFLOAT |
26 | M_DECL_FUNC (__cacosh) (CFLOAT x) | |
281f5073 | 27 | { |
01ee3870 | 28 | CFLOAT res; |
281f5073 PM |
29 | int rcls = fpclassify (__real__ x); |
30 | int icls = fpclassify (__imag__ x); | |
31 | ||
32 | if (rcls <= FP_INFINITE || icls <= FP_INFINITE) | |
33 | { | |
34 | if (icls == FP_INFINITE) | |
35 | { | |
01ee3870 | 36 | __real__ res = M_HUGE_VAL; |
281f5073 PM |
37 | |
38 | if (rcls == FP_NAN) | |
01ee3870 | 39 | __imag__ res = M_NAN; |
281f5073 | 40 | else |
01ee3870 PM |
41 | __imag__ res = M_COPYSIGN ((rcls == FP_INFINITE |
42 | ? (__real__ x < 0 | |
43 | ? M_MLIT (M_PI) - M_MLIT (M_PI_4) | |
44 | : M_MLIT (M_PI_4)) | |
45 | : M_MLIT (M_PI_2)), __imag__ x); | |
281f5073 PM |
46 | } |
47 | else if (rcls == FP_INFINITE) | |
48 | { | |
01ee3870 | 49 | __real__ res = M_HUGE_VAL; |
281f5073 PM |
50 | |
51 | if (icls >= FP_ZERO) | |
01ee3870 PM |
52 | __imag__ res = M_COPYSIGN (signbit (__real__ x) |
53 | ? M_MLIT (M_PI) : 0, __imag__ x); | |
281f5073 | 54 | else |
01ee3870 | 55 | __imag__ res = M_NAN; |
281f5073 PM |
56 | } |
57 | else | |
58 | { | |
01ee3870 PM |
59 | __real__ res = M_NAN; |
60 | __imag__ res = M_NAN; | |
281f5073 PM |
61 | } |
62 | } | |
63 | else if (rcls == FP_ZERO && icls == FP_ZERO) | |
64 | { | |
01ee3870 PM |
65 | __real__ res = 0; |
66 | __imag__ res = M_COPYSIGN (M_MLIT (M_PI_2), __imag__ x); | |
281f5073 PM |
67 | } |
68 | else | |
69 | { | |
01ee3870 | 70 | CFLOAT y; |
281f5073 PM |
71 | |
72 | __real__ y = -__imag__ x; | |
73 | __imag__ y = __real__ x; | |
74 | ||
01ee3870 | 75 | y = M_SUF (__kernel_casinh) (y, 1); |
281f5073 PM |
76 | |
77 | if (signbit (__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 | } | |
87 | } | |
88 | ||
89 | return res; | |
90 | } | |
01ee3870 PM |
91 | |
92 | declare_mgen_alias (__cacosh, cacosh) | |
93 | ||
94 | #if M_LIBM_NEED_COMPAT (cacosh) | |
95 | declare_mgen_libm_compat (__cacosh, cacosh) | |
281f5073 | 96 | #endif |