git://sourceware.org / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 63551311 | 1 | /* Return arc hyperbole sine for float value. |
| d1d3431a | 2 | Copyright (C) 1997-2012 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> | |
| bc62c2fb | 22 | #include <math_private.h> |
| 63551311 UD |
23 | |
| 24 | ||
| 25 | __complex__ float | |
| 26 | __casinhf (__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 = __copysignf (HUGE_VALF, __real__ x); | |
| 37 | ||
| 38 | if (rcls == FP_NAN) | |
| 39 | __imag__ res = __nanf (""); | |
| 40 | else | |
| 41 | __imag__ res = __copysignf (rcls >= FP_ZERO ? M_PI_2 : M_PI_4, | |
| 42 | __imag__ x); | |
| 43 | } | |
| 44 | else if (rcls <= FP_INFINITE) | |
| 45 | { | |
| 46 | __real__ res = __real__ x; | |
| 47 | if ((rcls == FP_INFINITE && icls >= FP_ZERO) | |
| 48 | || (rcls == FP_NAN && icls == FP_ZERO)) | |
| 49 | __imag__ res = __copysignf (0.0, __imag__ x); | |
| 50 | else | |
| 51 | __imag__ res = __nanf (""); | |
| 52 | } | |
| 53 | else | |
| 54 | { | |
| 55 | __real__ res = __nanf (""); | |
| 56 | __imag__ res = __nanf (""); | |
| 57 | } | |
| 58 | } | |
| 59 | else if (rcls == FP_ZERO && icls == FP_ZERO) | |
| 60 | { | |
| 61 | res = x; | |
| 62 | } | |
| 63 | else | |
| 64 | { | |
| 65 | __complex__ float y; | |
| 66 | ||
| 67 | __real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) + 1.0; | |
| 68 | __imag__ y = 2.0 * __real__ x * __imag__ x; | |
| 69 | ||
| 70 | y = __csqrtf (y); | |
| 71 | ||
| 72 | __real__ y += __real__ x; | |
| 73 | __imag__ y += __imag__ x; | |
| 74 | ||
| 75 | res = __clogf (y); | |
| d1d3431a JM |
76 | |
| 77 | /* Ensure zeros have correct sign and results are correct if | |
| 78 | very close to branch cuts. */ | |
| 79 | __real__ res = __copysignf (__real__ res, __real__ x); | |
| 80 | __imag__ res = __copysignf (__imag__ res, __imag__ x); | |
| 63551311 UD |
81 | } |
| 82 | ||
| 83 | return res; | |
| 84 | } | |
| 1705f0a3 | 85 | #ifndef __casinhf |
| 63551311 | 86 | weak_alias (__casinhf, casinhf) |
| 1705f0a3 | 87 | #endif |