Merge tag 'dma-mapping-6.4-2023-04-28' of git://git.infradead.org/users/hch/dma-mapping
[platform/kernel/linux-starfive.git] / lib / lshrdi3.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * lib/lshrdi3.c
4  */
5
6 #include <linux/module.h>
7 #include <linux/libgcc.h>
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);