projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| dfd2257a UD |
1 | /* Round argument to nearest integral value according to current rounding |
| 2 | direction. | |
| 568035b7 | 3 | Copyright (C) 1997-2013 Free Software Foundation, Inc. |
| dfd2257a UD |
4 | This file is part of the GNU C Library. |
| 5 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
| 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. | |
| dfd2257a 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. |
| dfd2257a | 16 | |
| 41bdb6e2 | 17 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
18 | License along with the GNU C Library; if not, see |
| 19 | <http://www.gnu.org/licenses/>. */ | |
| dfd2257a UD |
20 | |
| 21 | #include <math.h> | |
| 22 | ||
| 1ed0291c | 23 | #include <math_private.h> |
| dfd2257a UD |
24 | |
| 25 | static const long double two63[2] = | |
| 26 | { | |
| 27 | 9.223372036854775808000000e+18, /* 0x403E, 0x00000000, 0x00000000 */ | |
| 28 | -9.223372036854775808000000e+18 /* 0xC03E, 0x00000000, 0x00000000 */ | |
| 29 | }; | |
| 30 | ||
| 31 | ||
| 32 | long long int | |
| 33 | __llrintl (long double x) | |
| 34 | { | |
| 35 | int32_t se,j0; | |
| af6f3906 | 36 | u_int32_t i0, i1; |
| dfd2257a UD |
37 | long long int result; |
| 38 | volatile long double w; | |
| 39 | long double t; | |
| 40 | int sx; | |
| 41 | ||
| 42 | GET_LDOUBLE_WORDS (se, i0, i1, x); | |
| 43 | ||
| 44 | sx = (se >> 15) & 1; | |
| 45 | j0 = (se & 0x7fff) - 0x3fff; | |
| 46 | ||
| cc3fa755 | 47 | if (j0 < (int32_t) (8 * sizeof (long long int)) - 1) |
| dfd2257a | 48 | { |
| 6624dbc0 | 49 | if (j0 >= 63) |
| cc3fa755 | 50 | result = (((long long int) i0 << 32) | i1) << (j0 - 63); |
| dfd2257a UD |
51 | else |
| 52 | { | |
| 53 | w = two63[sx] + x; | |
| 54 | t = w - two63[sx]; | |
| 55 | GET_LDOUBLE_WORDS (se, i0, i1, t); | |
| 56 | j0 = (se & 0x7fff) - 0x3fff; | |
| 57 | ||
| 6624dbc0 UD |
58 | if (j0 < 0) |
| 59 | result = 0; | |
| 60 | else if (j0 <= 31) | |
| af6f3906 UD |
61 | result = i0 >> (31 - j0); |
| 62 | else | |
| 63 | result = ((long long int) i0 << (j0 - 31)) | (i1 >> (63 - j0)); | |
| dfd2257a UD |
64 | } |
| 65 | } | |
| 66 | else | |
| 67 | { | |
| 68 | /* The number is too large. It is left implementation defined | |
| 69 | what happens. */ | |
| 70 | return (long long int) x; | |
| 71 | } | |
| 72 | ||
| 73 | return sx ? -result : result; | |
| 74 | } | |
| 75 | ||
| 76 | weak_alias (__llrintl, llrintl) |