1dnl  SPARC mpn_rshift -- Shift a number right.
2
3dnl  Copyright 1995, 1996, 2000 Free Software Foundation, Inc.
4
5dnl  This file is part of the GNU MP Library.
6
7dnl  The GNU MP Library is free software; you can redistribute it and/or modify
8dnl  it under the terms of the GNU Lesser General Public License as published
9dnl  by the Free Software Foundation; either version 3 of the License, or (at
10dnl  your option) any later version.
11
12dnl  The GNU MP Library is distributed in the hope that it will be useful, but
13dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
15dnl  License for more details.
16
17dnl  You should have received a copy of the GNU Lesser General Public License
18dnl  along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.
19
20
21include(`../config.m4')
22
23C INPUT PARAMETERS
24C res_ptr	%o0
25C src_ptr	%o1
26C size		%o2
27C cnt		%o3
28
29ASM_START()
30PROLOGUE(mpn_rshift)
31	ld	[%o1],%g2	C load first limb
32	sub	%g0,%o3,%o5	C negate shift count
33	add	%o2,-1,%o2
34	andcc	%o2,4-1,%g4	C number of limbs in first loop
35	sll	%g2,%o5,%g1	C compute function result
36	be	L(0)		C if multiple of 4 limbs, skip first loop
37	st	%g1,[%sp+80]
38
39	sub	%o2,%g4,%o2	C adjust count for main loop
40
41L(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	L(loop0)
51	 st	%o4,[%o0-4]
52
53L(0):	tst	%o2
54	be	L(end)
55	 nop
56
57L(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	L(loop)
85	 st	%g4,[%o0-4]
86
87L(end):	srl	%g2,%o3,%g2
88	st	%g2,[%o0-0]
89	retl
90	ld	[%sp+80],%o0
91EPILOGUE(mpn_rshift)
92