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1ec601bf | 1 | /* Truncate argument to nearest integral value not larger than the argument. |
1a41c323 | 2 | Copyright (C) 1997-2013 Free Software Foundation, Inc. |
1ec601bf FXC |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and | |
5 | Jakub Jelinek <jj@ultra.linux.cz>, 1999. | |
6 | ||
7 | The GNU C Library is free software; you can redistribute it and/or | |
8 | modify it under the terms of the GNU Lesser General Public | |
9 | License as published by the Free Software Foundation; either | |
10 | version 2.1 of the License, or (at your option) any later version. | |
11 | ||
12 | The GNU C Library is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public | |
18 | License along with the GNU C Library; if not, write to the Free | |
19 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
20 | 02111-1307 USA. */ | |
21 | ||
22 | #include "quadmath-imp.h" | |
23 | ||
24 | ||
25 | __float128 | |
26 | truncq (__float128 x) | |
27 | { | |
28 | int32_t j0; | |
29 | uint64_t i0, i1, sx; | |
30 | ||
31 | GET_FLT128_WORDS64 (i0, i1, x); | |
32 | sx = i0 & 0x8000000000000000ULL; | |
33 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; | |
34 | if (j0 < 48) | |
35 | { | |
36 | if (j0 < 0) | |
37 | /* The magnitude of the number is < 1 so the result is +-0. */ | |
38 | SET_FLT128_WORDS64 (x, sx, 0); | |
39 | else | |
40 | SET_FLT128_WORDS64 (x, i0 & ~(0x0000ffffffffffffLL >> j0), 0); | |
41 | } | |
42 | else if (j0 > 111) | |
43 | { | |
44 | if (j0 == 0x4000) | |
45 | /* x is inf or NaN. */ | |
46 | return x + x; | |
47 | } | |
48 | else | |
49 | { | |
50 | SET_FLT128_WORDS64 (x, i0, i1 & ~(0xffffffffffffffffULL >> (j0 - 48))); | |
51 | } | |
52 | ||
53 | return x; | |
54 | } |