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63551311 | 1 | /* Return arc hyperbole cosine for float value. |
b168057a | 2 | Copyright (C) 1997-2015 Free Software Foundation, Inc. |
63551311 UD |
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 | |
41bdb6e2 AJ |
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. | |
63551311 UD |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
63551311 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
63551311 UD |
19 | |
20 | #include <complex.h> | |
21 | #include <math.h> | |
22 | ||
9277c064 | 23 | #include <math_private.h> |
63551311 UD |
24 | |
25 | __complex__ float | |
26 | __cacoshf (__complex__ float x) | |
27 | { | |
28 | __complex__ float res; | |
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 | { | |
36 | __real__ res = HUGE_VALF; | |
37 | ||
38 | if (rcls == FP_NAN) | |
39 | __imag__ res = __nanf (""); | |
40 | else | |
41 | __imag__ res = __copysignf ((rcls == FP_INFINITE | |
42 | ? (__real__ x < 0.0 | |
43 | ? M_PI - M_PI_4 : M_PI_4) | |
44 | : M_PI_2), __imag__ x); | |
45 | } | |
46 | else if (rcls == FP_INFINITE) | |
47 | { | |
48 | __real__ res = HUGE_VALF; | |
49 | ||
50 | if (icls >= FP_ZERO) | |
51 | __imag__ res = __copysignf (signbit (__real__ x) ? M_PI : 0.0, | |
52 | __imag__ x); | |
53 | else | |
54 | __imag__ res = __nanf (""); | |
55 | } | |
56 | else | |
57 | { | |
58 | __real__ res = __nanf (""); | |
59 | __imag__ res = __nanf (""); | |
60 | } | |
61 | } | |
62 | else if (rcls == FP_ZERO && icls == FP_ZERO) | |
63 | { | |
64 | __real__ res = 0.0; | |
65 | __imag__ res = __copysignf (M_PI_2, __imag__ x); | |
66 | } | |
67 | else | |
68 | { | |
69 | __complex__ float y; | |
70 | ||
52ce4860 JM |
71 | __real__ y = -__imag__ x; |
72 | __imag__ y = __real__ x; | |
63551311 | 73 | |
52ce4860 | 74 | y = __kernel_casinhf (y, 1); |
4f7e7f8e | 75 | |
52ce4860 JM |
76 | if (signbit (__imag__ x)) |
77 | { | |
78 | __real__ res = __real__ y; | |
79 | __imag__ res = -__imag__ y; | |
80 | } | |
81 | else | |
82 | { | |
83 | __real__ res = -__real__ y; | |
84 | __imag__ res = __imag__ y; | |
85 | } | |
63551311 UD |
86 | } |
87 | ||
88 | return res; | |
89 | } | |
1705f0a3 | 90 | #ifndef __cacoshf |
63551311 | 91 | weak_alias (__cacoshf, cacoshf) |
1705f0a3 | 92 | #endif |