xref: /linux/lib/lshrdi3.c (revision 588cb88c) 
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 
__lshrdi3(long long u,word_type b)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);
33