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bc9f6000 | 1 | /* Truncate argument to nearest integral value not larger than the argument. |
48252123 | 2 | Copyright (C) 1997, 1998 Free Software Foundation, Inc. |
bc9f6000 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. | |
bc9f6000 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. |
bc9f6000 | 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. */ | |
bc9f6000 UD |
20 | |
21 | #include <math.h> | |
22 | ||
23 | #include "math_private.h" | |
24 | ||
25 | ||
26 | float | |
27 | __truncf (float x) | |
28 | { | |
29 | int32_t i0, j0; | |
30 | int sx; | |
31 | ||
32 | GET_FLOAT_WORD (i0, x); | |
33 | sx = i0 & 0x80000000; | |
34 | j0 = ((i0 >> 23) & 0xff) - 0x7f; | |
35 | if (j0 < 23) | |
36 | { | |
37 | if (j0 < 0) | |
38 | /* The magnitude of the number is < 1 so the result is +-0. */ | |
39 | SET_FLOAT_WORD (x, sx); | |
40 | else | |
48252123 | 41 | SET_FLOAT_WORD (x, sx | (i0 & ~(0x007fffff >> j0))); |
bc9f6000 UD |
42 | } |
43 | else | |
44 | { | |
45 | if (j0 == 0x80) | |
46 | /* x is inf or NaN. */ | |
47 | return x + x; | |
48 | } | |
49 | ||
50 | return x; | |
51 | } | |
52 | weak_alias (__truncf, truncf) |