1 | /* Return arc hyperbole cosine for float value. |
2 | Copyright (C) 1997-2016 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 | <http://www.gnu.org/licenses/>. */ |
19 | |
20 | #include <complex.h> |
21 | #include <math.h> |
22 | |
23 | #include <math_private.h> |
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 | |
71 | __real__ y = -__imag__ x; |
72 | __imag__ y = __real__ x; |
73 | |
74 | y = __kernel_casinhf (y, 1); |
75 | |
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 | } |
86 | } |
87 | |
88 | return res; |
89 | } |
90 | #ifndef __cacoshf |
91 | weak_alias (__cacoshf, cacoshf) |
92 | #endif |
93 | |