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Palmer Dabbeltb35cd982017-05-23 10:28:26 -07001/*
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
Christoph Hellwig4db2b602017-11-22 11:47:28 +010019#include <linux/libgcc.h>
Palmer Dabbeltb35cd982017-05-23 10:28:26 -070020
21long 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}
46EXPORT_SYMBOL(__ashrdi3);