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63551311 | 1 | /* Complex hyperbole tangent for float. |
7edb55ce | 2 | Copyright (C) 1997, 2005, 2011 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 AJ |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. */ | |
63551311 UD |
20 | |
21 | #include <complex.h> | |
779ae82e | 22 | #include <fenv.h> |
63551311 UD |
23 | #include <math.h> |
24 | ||
9277c064 | 25 | #include <math_private.h> |
63551311 UD |
26 | |
27 | ||
28 | __complex__ float | |
29 | __ctanhf (__complex__ float x) | |
30 | { | |
31 | __complex__ float res; | |
32 | ||
b4012b75 | 33 | if (!isfinite (__real__ x) || !isfinite (__imag__ x)) |
63551311 | 34 | { |
7edb55ce | 35 | if (__isinf_nsf (__real__ x)) |
63551311 UD |
36 | { |
37 | __real__ res = __copysignf (1.0, __real__ x); | |
38 | __imag__ res = __copysignf (0.0, __imag__ x); | |
39 | } | |
40 | else if (__imag__ x == 0.0) | |
41 | { | |
42 | res = x; | |
43 | } | |
44 | else | |
45 | { | |
46 | __real__ res = __nanf (""); | |
47 | __imag__ res = __nanf (""); | |
779ae82e UD |
48 | |
49 | #ifdef FE_INVALID | |
7edb55ce | 50 | if (__isinf_nsf (__imag__ x)) |
779ae82e UD |
51 | feraiseexcept (FE_INVALID); |
52 | #endif | |
63551311 UD |
53 | } |
54 | } | |
55 | else | |
56 | { | |
7799b7b3 UD |
57 | float sin2ix, cos2ix; |
58 | float den; | |
59 | ||
60 | __sincosf (2.0 * __imag__ x, &sin2ix, &cos2ix); | |
61 | ||
62 | den = (__ieee754_coshf (2.0 * __real__ x) + cos2ix); | |
63551311 | 63 | |
96191db2 UD |
64 | if (den == 0.0f) |
65 | { | |
66 | __complex__ float ez = __cexpf (x); | |
67 | __complex__ float emz = __cexpf (-x); | |
68 | ||
69 | res = (ez - emz) / (ez + emz); | |
70 | } | |
71 | else | |
72 | { | |
73 | __real__ res = __ieee754_sinhf (2.0 * __real__ x) / den; | |
74 | __imag__ res = sin2ix / den; | |
75 | } | |
63551311 UD |
76 | } |
77 | ||
78 | return res; | |
79 | } | |
1705f0a3 | 80 | #ifndef __ctanhf |
63551311 | 81 | weak_alias (__ctanhf, ctanhf) |
1705f0a3 | 82 | #endif |