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377a515b UD |
1 | /* Return classification value corresponding to argument. |
2 | Copyright (C) 1997 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 Library General Public License as | |
8 | published by the Free Software Foundation; either version 2 of the | |
9 | 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 | Library General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Library General Public | |
17 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include <math.h> | |
22 | ||
23 | #include "math_private.h" | |
24 | ||
25 | ||
26 | int | |
27 | __fpclassify (double x) | |
28 | { | |
29 | u_int32_t hx, lx; | |
30 | int retval = FP_NORMAL; | |
31 | ||
f166d865 | 32 | EXTRACT_WORDS (hx, lx, x); |
377a515b UD |
33 | lx |= hx & 0xfffff; |
34 | hx &= 0x7ff00000; | |
35 | if ((hx | lx) == 0) | |
36 | retval = FP_ZERO; | |
37 | else if (hx == 0) | |
38 | retval = FP_SUBNORMAL; | |
39 | else if (hx == 0x7ff00000) | |
40 | retval = lx != 0 ? FP_NAN : FP_INFINITE; | |
41 | ||
42 | return retval; | |
43 | } |