aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libgmp/mpn/sparc32/lshift.S
blob: 4f0595f2fb63715f2d09f7b81d993a823c99394d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
! sparc __mpn_lshift --

! Copyright (C) 1995, 1996 Free Software Foundation, Inc.

! This file is part of the GNU MP Library.

! The GNU MP Library is free software; you can redistribute it and/or modify
! it under the terms of the GNU Library General Public License as published by
! the Free Software Foundation; either version 2 of the License, or (at your
! option) any later version.

! The GNU MP Library is distributed in the hope that it will be useful, but
! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
! License for more details.

! You should have received a copy of the GNU Library General Public License
! along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
! the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
! MA 02111-1307, USA.


! INPUT PARAMETERS
! res_ptr	%o0
! src_ptr	%o1
! size		%o2
! cnt		%o3

#include "sysdep.h"

	.text
	.align	4
	.global	C_SYMBOL_NAME(__mpn_lshift)
C_SYMBOL_NAME(__mpn_lshift):
	sll	%o2,2,%g1
	add	%o1,%g1,%o1	! make %o1 point at end of src
	ld	[%o1-4],%g2	! load first limb
	sub	%g0,%o3,%o5	! negate shift count
	add	%o0,%g1,%o0	! make %o0 point at end of res
	add	%o2,-1,%o2
	andcc	%o2,4-1,%g4	! number of limbs in first loop
	srl	%g2,%o5,%g1	! compute function result
	be	L0		! if multiple of 4 limbs, skip first loop
	st	%g1,[%sp+80]

	sub	%o2,%g4,%o2	! adjust count for main loop

Loop0:	ld	[%o1-8],%g3
	add	%o0,-4,%o0
	add	%o1,-4,%o1
	addcc	%g4,-1,%g4
	sll	%g2,%o3,%o4
	srl	%g3,%o5,%g1
	mov	%g3,%g2
	or	%o4,%g1,%o4
	bne	Loop0
	 st	%o4,[%o0+0]

L0:	tst	%o2
	be	Lend
	 nop

Loop:	ld	[%o1-8],%g3
	add	%o0,-16,%o0
	addcc	%o2,-4,%o2
	sll	%g2,%o3,%o4
	srl	%g3,%o5,%g1

	ld	[%o1-12],%g2
	sll	%g3,%o3,%g4
	or	%o4,%g1,%o4
	st	%o4,[%o0+12]
	srl	%g2,%o5,%g1

	ld	[%o1-16],%g3
	sll	%g2,%o3,%o4
	or	%g4,%g1,%g4
	st	%g4,[%o0+8]
	srl	%g3,%o5,%g1

	ld	[%o1-20],%g2
	sll	%g3,%o3,%g4
	or	%o4,%g1,%o4
	st	%o4,[%o0+4]
	srl	%g2,%o5,%g1

	add	%o1,-16,%o1
	or	%g4,%g1,%g4
	bne	Loop
	 st	%g4,[%o0+0]

Lend:	sll	%g2,%o3,%g2
	st	%g2,[%o0-4]
	retl
	ld	[%sp+80],%o0