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01ee3870 | 1 | /* Return arc hyperbolic cosine for a complex type. |
6d7e8eda | 2 | Copyright (C) 1997-2023 Free Software Foundation, Inc. |
281f5073 | 3 | This file is part of the GNU C Library. |
281f5073 PM |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
281f5073 PM |
18 | |
19 | #include <complex.h> | |
20 | #include <math.h> | |
281f5073 PM |
21 | |
22 | ||
01ee3870 PM |
23 | CFLOAT |
24 | M_DECL_FUNC (__cacosh) (CFLOAT x) | |
281f5073 | 25 | { |
01ee3870 | 26 | CFLOAT res; |
281f5073 PM |
27 | int rcls = fpclassify (__real__ x); |
28 | int icls = fpclassify (__imag__ x); | |
29 | ||
30 | if (rcls <= FP_INFINITE || icls <= FP_INFINITE) | |
31 | { | |
32 | if (icls == FP_INFINITE) | |
33 | { | |
01ee3870 | 34 | __real__ res = M_HUGE_VAL; |
281f5073 PM |
35 | |
36 | if (rcls == FP_NAN) | |
01ee3870 | 37 | __imag__ res = M_NAN; |
281f5073 | 38 | else |
01ee3870 PM |
39 | __imag__ res = M_COPYSIGN ((rcls == FP_INFINITE |
40 | ? (__real__ x < 0 | |
41 | ? M_MLIT (M_PI) - M_MLIT (M_PI_4) | |
42 | : M_MLIT (M_PI_4)) | |
43 | : M_MLIT (M_PI_2)), __imag__ x); | |
281f5073 PM |
44 | } |
45 | else if (rcls == FP_INFINITE) | |
46 | { | |
01ee3870 | 47 | __real__ res = M_HUGE_VAL; |
281f5073 PM |
48 | |
49 | if (icls >= FP_ZERO) | |
01ee3870 PM |
50 | __imag__ res = M_COPYSIGN (signbit (__real__ x) |
51 | ? M_MLIT (M_PI) : 0, __imag__ x); | |
281f5073 | 52 | else |
01ee3870 | 53 | __imag__ res = M_NAN; |
281f5073 PM |
54 | } |
55 | else | |
56 | { | |
01ee3870 | 57 | __real__ res = M_NAN; |
5244527d JM |
58 | if (rcls == FP_ZERO) |
59 | __imag__ res = M_MLIT (M_PI_2); | |
60 | else | |
61 | __imag__ res = M_NAN; | |
281f5073 PM |
62 | } |
63 | } | |
64 | else if (rcls == FP_ZERO && icls == FP_ZERO) | |
65 | { | |
01ee3870 PM |
66 | __real__ res = 0; |
67 | __imag__ res = M_COPYSIGN (M_MLIT (M_PI_2), __imag__ x); | |
281f5073 PM |
68 | } |
69 | else | |
70 | { | |
01ee3870 | 71 | CFLOAT y; |
281f5073 PM |
72 | |
73 | __real__ y = -__imag__ x; | |
74 | __imag__ y = __real__ x; | |
75 | ||
01ee3870 | 76 | y = M_SUF (__kernel_casinh) (y, 1); |
281f5073 PM |
77 | |
78 | if (signbit (__imag__ x)) | |
79 | { | |
80 | __real__ res = __real__ y; | |
81 | __imag__ res = -__imag__ y; | |
82 | } | |
83 | else | |
84 | { | |
85 | __real__ res = -__real__ y; | |
86 | __imag__ res = __imag__ y; | |
87 | } | |
88 | } | |
89 | ||
90 | return res; | |
91 | } | |
01ee3870 PM |
92 | |
93 | declare_mgen_alias (__cacosh, cacosh) |