1! sparc __mpn_rshift --
2!
3! Copyright (C) 1995-2021 Free Software Foundation, Inc.
4!
5! This file is part of the GNU MP Library.
6!
7! The GNU MP Library is free software; you can redistribute it and/or modify
8! it under the terms of the GNU Lesser General Public License as published by
9! the Free Software Foundation; either version 2.1 of the License, or (at your
10! option) any later version.
11!
12! The GNU MP Library is distributed in the hope that it will be useful, but
13! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14! or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
15! License for more details.
16!
17! You should have received a copy of the GNU Lesser General Public License
18! along with the GNU MP Library; see the file COPYING.LIB.  If not,
19! see <https://www.gnu.org/licenses/>.
20
21
22! INPUT PARAMETERS
23! RES_PTR	%o0
24! SRC_PTR	%o1
25! SIZE		%o2
26! CNT		%o3
27
28#include <sysdep.h>
29
30ENTRY(__mpn_rshift)
31	ld	[%o1],%g2	! load first limb
32	sub	%g0,%o3,%o5	! negate shift count
33	add	%o2,-1,%o2
34	andcc	%o2,4-1,%g4	! number of limbs in first loop
35	sll	%g2,%o5,%g1	! compute function result
36	be	LOC(0)		! if multiple of 4 limbs, skip first loop
37	st	%g1,[%sp+80]
38
39	sub	%o2,%g4,%o2	! adjust count for main loop
40
41LOC(loop0):
42	ld	[%o1+4],%g3
43	add	%o0,4,%o0
44	add	%o1,4,%o1
45	addcc	%g4,-1,%g4
46	srl	%g2,%o3,%o4
47	sll	%g3,%o5,%g1
48	mov	%g3,%g2
49	or	%o4,%g1,%o4
50	bne	LOC(loop0)
51	 st	%o4,[%o0-4]
52
53LOC(0):	tst	%o2
54	be	LOC(end)
55	 nop
56
57LOC(loop):
58	ld	[%o1+4],%g3
59	add	%o0,16,%o0
60	addcc	%o2,-4,%o2
61	srl	%g2,%o3,%o4
62	sll	%g3,%o5,%g1
63
64	ld	[%o1+8],%g2
65	srl	%g3,%o3,%g4
66	or	%o4,%g1,%o4
67	st	%o4,[%o0-16]
68	sll	%g2,%o5,%g1
69
70	ld	[%o1+12],%g3
71	srl	%g2,%o3,%o4
72	or	%g4,%g1,%g4
73	st	%g4,[%o0-12]
74	sll	%g3,%o5,%g1
75
76	ld	[%o1+16],%g2
77	srl	%g3,%o3,%g4
78	or	%o4,%g1,%o4
79	st	%o4,[%o0-8]
80	sll	%g2,%o5,%g1
81
82	add	%o1,16,%o1
83	or	%g4,%g1,%g4
84	bne	LOC(loop)
85	 st	%g4,[%o0-4]
86
87LOC(end):
88	srl	%g2,%o3,%g2
89	st	%g2,[%o0-0]
90	retl
91	ld	[%sp+80],%o0
92
93END(__mpn_rshift)
94