1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 */
4
5 #include <linux/export.h>
6
7 #include <linux/libgcc.h>
8
9 long long notrace __ashrdi3(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 = 1..1 or 0..0 */
22 w.s.high =
23 uu.s.high >> 31;
24 w.s.low = uu.s.high >> -bm;
25 } else {
26 const unsigned int carries = (unsigned int) uu.s.high << bm;
27
28 w.s.high = uu.s.high >> b;
29 w.s.low = ((unsigned int) uu.s.low >> b) | carries;
30 }
31
32 return w.ll;
33 }
34 EXPORT_SYMBOL(__ashrdi3);
35
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