| Thomas Gleixner | 588cb88 | 2019-05-23 11:14:57 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| Palmer Dabbelt | b35cd98 | 2017-05-23 10:28:26 -0700 | [diff] [blame] | 2 | /* |
| 3 | * lib/lshrdi3.c |
| Palmer Dabbelt | b35cd98 | 2017-05-23 10:28:26 -0700 | [diff] [blame] | 4 | */ |
| 5 | |
| 6 | #include <linux/module.h> |
| Christoph Hellwig | 4db2b60 | 2017-11-22 11:47:28 +0100 | [diff] [blame] | 7 | #include <linux/libgcc.h> |
| Palmer Dabbelt | b35cd98 | 2017-05-23 10:28:26 -0700 | [diff] [blame] | 8 | |
| 9 | long long notrace __lshrdi3(long long u, word_type b) |
| 10 | { |
| 11 | DWunion uu, w; |
| 12 | word_type bm; |
| 13 | |
| 14 | if (b == 0) |
| 15 | return u; |
| 16 | |
| 17 | uu.ll = u; |
| 18 | bm = 32 - b; |
| 19 | |
| 20 | if (bm <= 0) { |
| 21 | w.s.high = 0; |
| 22 | w.s.low = (unsigned int) uu.s.high >> -bm; |
| 23 | } else { |
| 24 | const unsigned int carries = (unsigned int) uu.s.high << bm; |
| 25 | |
| 26 | w.s.high = (unsigned int) uu.s.high >> b; |
| 27 | w.s.low = ((unsigned int) uu.s.low >> b) | carries; |
| 28 | } |
| 29 | |
| 30 | return w.ll; |
| 31 | } |
| 32 | EXPORT_SYMBOL(__lshrdi3); |