1 | /* Truncate argument to nearest integral value not larger than the argument. |
2 | Copyright (C) 1997-2019 Free Software Foundation, Inc. |
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, see |
19 | <http://www.gnu.org/licenses/>. */ |
20 | |
21 | #define NO_MATH_REDIRECT |
22 | #include <math.h> |
23 | |
24 | #include <math_private.h> |
25 | #include <libm-alias-ldouble.h> |
26 | |
27 | |
28 | _Float128 |
29 | __truncl (_Float128 x) |
30 | { |
31 | int32_t j0; |
32 | uint64_t i0, i1, sx; |
33 | |
34 | GET_LDOUBLE_WORDS64 (i0, i1, x); |
35 | sx = i0 & 0x8000000000000000ULL; |
36 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; |
37 | if (j0 < 48) |
38 | { |
39 | if (j0 < 0) |
40 | /* The magnitude of the number is < 1 so the result is +-0. */ |
41 | SET_LDOUBLE_WORDS64 (x, sx, 0); |
42 | else |
43 | SET_LDOUBLE_WORDS64 (x, i0 & ~(0x0000ffffffffffffLL >> j0), 0); |
44 | } |
45 | else if (j0 > 111) |
46 | { |
47 | if (j0 == 0x4000) |
48 | /* x is inf or NaN. */ |
49 | return x + x; |
50 | } |
51 | else |
52 | { |
53 | SET_LDOUBLE_WORDS64 (x, i0, i1 & ~(0xffffffffffffffffULL >> (j0 - 48))); |
54 | } |
55 | |
56 | return x; |
57 | } |
58 | libm_alias_ldouble (__trunc, trunc) |
59 | |