projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d2d2125e UD |
1 | /* Round argument to nearest integral value according to current rounding |
| 2 | direction. | |
| 5da9d124 | 3 | Copyright (C) 1997, 1999 Free Software Foundation, Inc. |
| d2d2125e UD |
4 | This file is part of the GNU C Library. |
| 5 | Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> | |
| 6 | ||
| 7 | The GNU C Library is free software; you can redistribute it and/or | |
| 3214b89b 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. | |
| d2d2125e 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 | |
| 3214b89b | 15 | Lesser General Public License for more details. |
| d2d2125e | 16 | |
| 3214b89b | 17 | You should have received a copy of the GNU Lesser General Public |
| ab84e3ff PE |
18 | License along with the GNU C Library. If not, see |
| 19 | <http://www.gnu.org/licenses/>. */ | |
| d2d2125e | 20 | |
| d2d2125e UD |
21 | #include <math.h> |
| 22 | #include "math_private.h" | |
| 5da9d124 | 23 | #include "mathimpl.h" |
| d2d2125e UD |
24 | |
| 25 | long long int | |
| 26 | __llrintf (float x) | |
| 27 | { | |
| 28 | int32_t e; | |
| 29 | u_int32_t i, s; | |
| 30 | long long int result; | |
| 31 | ||
| 32 | x = __m81_u(__rintf) (x); | |
| 33 | ||
| 34 | GET_FLOAT_WORD (i, x); | |
| 35 | ||
| 36 | e = ((i >> 23) & 0xff) - 0x7f; | |
| 37 | if (e < 0) | |
| 38 | return 0; | |
| 39 | s = i; | |
| 40 | i &= 0x7fffff; | |
| 41 | i |= 0x800000; | |
| 42 | ||
| 43 | if (e < 63) | |
| 44 | { | |
| 45 | if (e > 55) | |
| 46 | result = (long long int) (i << (e - 55)) << 32; | |
| 47 | else if (e > 31) | |
| 48 | result = (((long long int) (i >> (55 - e)) << 32) | (i << (e - 23))); | |
| 49 | else if (e > 23) | |
| 50 | result = i << (e - 23); | |
| 51 | else | |
| 52 | result = i >> (23 - e); | |
| 53 | if (s & 0x80000000) | |
| 54 | result = -result; | |
| 55 | } | |
| 56 | else | |
| 57 | /* The number is too large or not finite. The standard leaves it | |
| 58 | undefined what to return when the number is too large to fit in a | |
| 59 | `long long int'. */ | |
| 60 | result = -1LL; | |
| 61 | ||
| 62 | return result; | |
| 63 | } | |
| 64 | ||
| 65 | weak_alias (__llrintf, llrintf) |