| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Return classification value corresponding to argument. |
| 2 | Copyright (C) 1997, 2002 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, write to the Free |
| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 19 | 02111-1307 USA. */ |
| 20 | |
| 21 | #include <math.h> |
| 22 | |
| 23 | #include "math_private.h" |
| 24 | |
| 25 | int __fpclassify(double x) |
| 26 | { |
| 27 | u_int32_t hx, lx; |
| 28 | int retval = FP_NORMAL; |
| 29 | |
| 30 | EXTRACT_WORDS (hx, lx, x); |
| 31 | lx |= hx & 0xfffff; |
| 32 | hx &= 0x7ff00000; |
| 33 | if ((hx | lx) == 0) |
| 34 | retval = FP_ZERO; |
| 35 | else if (hx == 0) |
| 36 | retval = FP_SUBNORMAL; |
| 37 | else if (hx == 0x7ff00000) |
| 38 | retval = lx != 0 ? FP_NAN : FP_INFINITE; |
| 39 | |
| 40 | return retval; |
| 41 | } |
| 42 | libm_hidden_def(__fpclassify) |