| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Return arc hyperbole cosine for float value. |
| 2 | Copyright (C) 1997-2015 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 |