projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b35cd988 PD |
1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify | |
| 3 | * it under the terms of the GNU General Public License as published by | |
| 4 | * the Free Software Foundation; either version 2 of the License, or | |
| 5 | * (at your option) any later version. | |
| 6 | * | |
| 7 | * This program is distributed in the hope that it will be useful, | |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 10 | * GNU General Public License for more details. | |
| 11 | * | |
| 12 | * You should have received a copy of the GNU General Public License | |
| 13 | * along with this program; if not, see the file COPYING, or write | |
| 14 | * to the Free Software Foundation, Inc. | |
| 15 | */ | |
| 16 | ||
| 17 | #include <linux/export.h> | |
| 18 | ||
| 4db2b604 | 19 | #include <linux/libgcc.h> |
| b35cd988 PD |
20 | |
| 21 | long long notrace __ashrdi3(long long u, word_type b) | |
| 22 | { | |
| 23 | DWunion uu, w; | |
| 24 | word_type bm; | |
| 25 | ||
| 26 | if (b == 0) | |
| 27 | return u; | |
| 28 | ||
| 29 | uu.ll = u; | |
| 30 | bm = 32 - b; | |
| 31 | ||
| 32 | if (bm <= 0) { | |
| 33 | /* w.s.high = 1..1 or 0..0 */ | |
| 34 | w.s.high = | |
| 35 | uu.s.high >> 31; | |
| 36 | w.s.low = uu.s.high >> -bm; | |
| 37 | } else { | |
| 38 | const unsigned int carries = (unsigned int) uu.s.high << bm; | |
| 39 | ||
| 40 | w.s.high = uu.s.high >> b; | |
| 41 | w.s.low = ((unsigned int) uu.s.low >> b) | carries; | |
| 42 | } | |
| 43 | ||
| 44 | return w.ll; | |
| 45 | } | |
| 46 | EXPORT_SYMBOL(__ashrdi3); |