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1 | /* Return arc hyperbolic cosine for a complex type. | |
2 | Copyright (C) 1997-2021 Free Software Foundation, Inc. | |
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 | <https://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <complex.h> | |
21 | #include <math.h> | |
22 | ||
23 | ||
24 | CFLOAT | |
25 | M_DECL_FUNC (__cacosh) (CFLOAT x) | |
26 | { | |
27 | CFLOAT res; | |
28 | int rcls = fpclassify (__real__ x); | |
29 | int icls = fpclassify (__imag__ x); | |
30 | ||
31 | if (rcls <= FP_INFINITE || icls <= FP_INFINITE) | |
32 | { | |
33 | if (icls == FP_INFINITE) | |
34 | { | |
35 | __real__ res = M_HUGE_VAL; | |
36 | ||
37 | if (rcls == FP_NAN) | |
38 | __imag__ res = M_NAN; | |
39 | else | |
40 | __imag__ res = M_COPYSIGN ((rcls == FP_INFINITE | |
41 | ? (__real__ x < 0 | |
42 | ? M_MLIT (M_PI) - M_MLIT (M_PI_4) | |
43 | : M_MLIT (M_PI_4)) | |
44 | : M_MLIT (M_PI_2)), __imag__ x); | |
45 | } | |
46 | else if (rcls == FP_INFINITE) | |
47 | { | |
48 | __real__ res = M_HUGE_VAL; | |
49 | ||
50 | if (icls >= FP_ZERO) | |
51 | __imag__ res = M_COPYSIGN (signbit (__real__ x) | |
52 | ? M_MLIT (M_PI) : 0, __imag__ x); | |
53 | else | |
54 | __imag__ res = M_NAN; | |
55 | } | |
56 | else | |
57 | { | |
58 | __real__ res = M_NAN; | |
59 | if (rcls == FP_ZERO) | |
60 | __imag__ res = M_MLIT (M_PI_2); | |
61 | else | |
62 | __imag__ res = M_NAN; | |
63 | } | |
64 | } | |
65 | else if (rcls == FP_ZERO && icls == FP_ZERO) | |
66 | { | |
67 | __real__ res = 0; | |
68 | __imag__ res = M_COPYSIGN (M_MLIT (M_PI_2), __imag__ x); | |
69 | } | |
70 | else | |
71 | { | |
72 | CFLOAT y; | |
73 | ||
74 | __real__ y = -__imag__ x; | |
75 | __imag__ y = __real__ x; | |
76 | ||
77 | y = M_SUF (__kernel_casinh) (y, 1); | |
78 | ||
79 | if (signbit (__imag__ x)) | |
80 | { | |
81 | __real__ res = __real__ y; | |
82 | __imag__ res = -__imag__ y; | |
83 | } | |
84 | else | |
85 | { | |
86 | __real__ res = -__real__ y; | |
87 | __imag__ res = __imag__ y; | |
88 | } | |
89 | } | |
90 | ||
91 | return res; | |
92 | } | |
93 | ||
94 | declare_mgen_alias (__cacosh, cacosh) |