xref: /OK3568_Linux_fs/u-boot/arch/sh/lib/ashrdi3.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun #include "libgcc.h"
2*4882a593Smuzhiyun 
__ashrdi3(long long u,word_type b)3*4882a593Smuzhiyun long long __ashrdi3(long long u, word_type b)
4*4882a593Smuzhiyun {
5*4882a593Smuzhiyun 	DWunion uu, w;
6*4882a593Smuzhiyun 	word_type bm;
7*4882a593Smuzhiyun 
8*4882a593Smuzhiyun 	if (b == 0)
9*4882a593Smuzhiyun 		return u;
10*4882a593Smuzhiyun 
11*4882a593Smuzhiyun 	uu.ll = u;
12*4882a593Smuzhiyun 	bm = 32 - b;
13*4882a593Smuzhiyun 
14*4882a593Smuzhiyun 	if (bm <= 0) {
15*4882a593Smuzhiyun 		/* w.s.high = 1..1 or 0..0 */
16*4882a593Smuzhiyun 		w.s.high =
17*4882a593Smuzhiyun 		    uu.s.high >> 31;
18*4882a593Smuzhiyun 		w.s.low = uu.s.high >> -bm;
19*4882a593Smuzhiyun 	} else {
20*4882a593Smuzhiyun 		const unsigned int carries = (unsigned int) uu.s.high << bm;
21*4882a593Smuzhiyun 
22*4882a593Smuzhiyun 		w.s.high = uu.s.high >> b;
23*4882a593Smuzhiyun 		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
24*4882a593Smuzhiyun 	}
25*4882a593Smuzhiyun 
26*4882a593Smuzhiyun 	return w.ll;
27*4882a593Smuzhiyun }
28