projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| dfd2257a UD |
1 | /* Round argument to nearest integral value according to current rounding |
| 2 | direction. | |
| a334319f | 3 | Copyright (C) 1997, 1999 Free Software Foundation, Inc. |
| dfd2257a | 4 | This file is part of the GNU C Library. |
| abfbdde1 UD |
5 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and |
| 6 | Jakub Jelinek <jj@ultra.linux.cz>, 1999. | |
| dfd2257a UD |
7 | |
| 8 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
9 | modify it under the terms of the GNU Lesser General Public |
| 10 | License as published by the Free Software Foundation; either | |
| 11 | version 2.1 of the License, or (at your option) any later version. | |
| dfd2257a UD |
12 | |
| 13 | The GNU C Library is distributed in the hope that it will be useful, | |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 16 | Lesser General Public License for more details. |
| dfd2257a | 17 | |
| 41bdb6e2 AJ |
18 | You should have received a copy of the GNU Lesser General Public |
| 19 | License along with the GNU C Library; if not, write to the Free | |
| 20 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 21 | 02111-1307 USA. */ | |
| dfd2257a UD |
22 | |
| 23 | #include <math.h> | |
| 24 | ||
| 25 | #include "math_private.h" | |
| 26 | ||
| abfbdde1 | 27 | static const long double two112[2] = |
| dfd2257a | 28 | { |
| abfbdde1 UD |
29 | 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */ |
| 30 | -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */ | |
| dfd2257a UD |
31 | }; |
| 32 | ||
| dfd2257a UD |
33 | long long int |
| 34 | __llrintl (long double x) | |
| 35 | { | |
| abfbdde1 UD |
36 | int32_t j0; |
| 37 | u_int64_t i0,i1; | |
| dfd2257a UD |
38 | volatile long double w; |
| 39 | long double t; | |
| abfbdde1 | 40 | long long int result; |
| dfd2257a UD |
41 | int sx; |
| 42 | ||
| abfbdde1 UD |
43 | GET_LDOUBLE_WORDS64 (i0, i1, x); |
| 44 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; | |
| 45 | sx = i0 >> 63; | |
| 46 | i0 &= 0x0000ffffffffffffLL; | |
| 47 | i0 |= 0x0001000000000000LL; | |
| dfd2257a | 48 | |
| cc3fa755 | 49 | if (j0 < (int32_t) (8 * sizeof (long long int)) - 1) |
| dfd2257a | 50 | { |
| a334319f UD |
51 | if (j0 < -1) |
| 52 | return 0; | |
| abfbdde1 UD |
53 | w = two112[sx] + x; |
| 54 | t = w - two112[sx]; | |
| a334319f | 55 | GET_LDOUBLE_WORDS64 (i0, i1, x); |
| abfbdde1 UD |
56 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; |
| 57 | i0 &= 0x0000ffffffffffffLL; | |
| 58 | i0 |= 0x0001000000000000LL; | |
| dfd2257a | 59 | |
| a334319f | 60 | if (j0 <= 48) |
| abfbdde1 UD |
61 | result = i0 >> (48 - j0); |
| 62 | else | |
| 63 | result = ((long long int) i0 << (j0 - 48)) | (i1 >> (112 - j0)); | |
| dfd2257a UD |
64 | } |
| 65 | else | |
| 66 | { | |
| 67 | /* The number is too large. It is left implementation defined | |
| 68 | what happens. */ | |
| 69 | return (long long int) x; | |
| 70 | } | |
| 71 | ||
| 72 | return sx ? -result : result; | |
| 73 | } | |
| 74 | ||
| 75 | weak_alias (__llrintl, llrintl) |