projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| bc9f6000 | 1 | /* Truncate argument to nearest integral value not larger than the argument. |
| 58d33bb5 | 2 | Copyright (C) 1997, 1999 Free Software Foundation, Inc. |
| bc9f6000 | 3 | This file is part of the GNU C Library. |
| abfbdde1 UD |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and |
| 5 | Jakub Jelinek <jj@ultra.linux.cz>, 1999. | |
| bc9f6000 UD |
6 | |
| 7 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
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. | |
| bc9f6000 UD |
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 | |
| 41bdb6e2 | 15 | Lesser General Public License for more details. |
| bc9f6000 | 16 | |
| 41bdb6e2 AJ |
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. */ | |
| bc9f6000 UD |
21 | |
| 22 | #include <math.h> | |
| 23 | ||
| 24 | #include "math_private.h" | |
| 25 | ||
| 26 | ||
| 27 | long double | |
| 28 | __truncl (long double x) | |
| 29 | { | |
| abfbdde1 UD |
30 | int32_t j0; |
| 31 | u_int64_t i0, i1, sx; | |
| 32 | ||
| 33 | GET_LDOUBLE_WORDS64 (i0, i1, x); | |
| 34 | sx = i0 & 0x8000000000000000ULL; | |
| 35 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; | |
| 36 | if (j0 < 48) | |
| bc9f6000 UD |
37 | { |
| 38 | if (j0 < 0) | |
| 39 | /* The magnitude of the number is < 1 so the result is +-0. */ | |
| abfbdde1 | 40 | SET_LDOUBLE_WORDS64 (x, sx, 0); |
| bc9f6000 | 41 | else |
| abfbdde1 | 42 | SET_LDOUBLE_WORDS64 (x, i0 & ~(0x0000ffffffffffffLL >> j0), 0); |
| bc9f6000 | 43 | } |
| abfbdde1 | 44 | else if (j0 > 111) |
| bc9f6000 UD |
45 | { |
| 46 | if (j0 == 0x4000) | |
| 47 | /* x is inf or NaN. */ | |
| 48 | return x + x; | |
| 49 | } | |
| 50 | else | |
| 51 | { | |
| abfbdde1 | 52 | SET_LDOUBLE_WORDS64 (x, i0, i1 & ~(0xffffffffffffffffULL >> (j0 - 48))); |
| bc9f6000 UD |
53 | } |
| 54 | ||
| 55 | return x; | |
| 56 | } | |
| 57 | weak_alias (__truncl, truncl) |