xref: /OK3568_Linux_fs/kernel/arch/h8300/lib/lshrdi3.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include "libgcc.h"
3*4882a593Smuzhiyun 
__lshrdi3(DWtype u,word_type b)4*4882a593Smuzhiyun DWtype __lshrdi3(DWtype u, word_type b)
5*4882a593Smuzhiyun {
6*4882a593Smuzhiyun 	const DWunion uu = {.ll = u};
7*4882a593Smuzhiyun 	const word_type bm = (sizeof (Wtype) * BITS_PER_UNIT) - b;
8*4882a593Smuzhiyun 	DWunion w;
9*4882a593Smuzhiyun 
10*4882a593Smuzhiyun 	if (b == 0)
11*4882a593Smuzhiyun 		return u;
12*4882a593Smuzhiyun 
13*4882a593Smuzhiyun 	if (bm <= 0) {
14*4882a593Smuzhiyun 		w.s.high = 0;
15*4882a593Smuzhiyun 		w.s.low = (UWtype) uu.s.high >> -bm;
16*4882a593Smuzhiyun 	} else {
17*4882a593Smuzhiyun 		const UWtype carries = (UWtype) uu.s.high << bm;
18*4882a593Smuzhiyun 
19*4882a593Smuzhiyun 		w.s.high = (UWtype) uu.s.high >> b;
20*4882a593Smuzhiyun 		w.s.low = ((UWtype) uu.s.low >> b) | carries;
21*4882a593Smuzhiyun 	}
22*4882a593Smuzhiyun 
23*4882a593Smuzhiyun 	return w.ll;
24*4882a593Smuzhiyun }
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