summary refs log tree commit diff
path: root/sysdeps/sparc/submul_1.S
blob: ed67c99d296768a28c160e1b0fb5f12ade5d76db (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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
! SPARC __mpn_submul_1 -- Multiply a limb vector with a limb and subtract
! the result from a second limb vector.

! Copyright (C) 1992, 1993, 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA.


! INPUT PARAMETERS
! res_ptr	o0
! s1_ptr	o1
! size		o2
! s2_limb	o3

#include "sysdep.h"

.text
	.align 4
	.global	C_SYMBOL_NAME(__mpn_submul_1)
C_SYMBOL_NAME(__mpn_submul_1):
	! Make S1_PTR and RES_PTR point at the end of their blocks
	! and put (- 4 x SIZE) in index/loop counter.
	sll	%o2,2,%o2
	add	%o0,%o2,%o4	! RES_PTR in o4 since o0 is retval
	add	%o1,%o2,%o1
	sub	%g0,%o2,%o2

	cmp	%o3,0xfff
	bgu	Large
	nop

	ld	[%o1+%o2],%o5
	mov	0,%o0
	b	L0
	 add	%o4,-4,%o4
Loop0:
	subcc	%o5,%g1,%g1
	ld	[%o1+%o2],%o5
	addx	%o0,%g0,%o0
	st	%g1,[%o4+%o2]
L0:	wr	%g0,%o3,%y
	sra	%o5,31,%g2
	and	%o3,%g2,%g2
	andcc	%g1,0,%g1
	mulscc	%g1,%o5,%g1
 	mulscc	%g1,%o5,%g1
 	mulscc	%g1,%o5,%g1
 	mulscc	%g1,%o5,%g1
	mulscc	%g1,%o5,%g1
	mulscc	%g1,%o5,%g1
	mulscc	%g1,%o5,%g1
	mulscc	%g1,%o5,%g1
	mulscc	%g1,%o5,%g1
	mulscc	%g1,%o5,%g1
	mulscc	%g1,%o5,%g1
	mulscc	%g1,%o5,%g1
	mulscc	%g1,0,%g1
	sra	%g1,20,%g4
	sll	%g1,12,%g1
 	rd	%y,%g3
	srl	%g3,20,%g3
	or	%g1,%g3,%g1

	addcc	%g1,%o0,%g1
	addx	%g2,%g4,%o0	! add sign-compensation and cy to hi limb
	addcc	%o2,4,%o2	! loop counter
	bne	Loop0
	 ld	[%o4+%o2],%o5

	subcc	%o5,%g1,%g1
	addx	%o0,%g0,%o0
	retl
	st	%g1,[%o4+%o2]


Large:	ld	[%o1+%o2],%o5
	mov	0,%o0
	sra	%o3,31,%g4	! g4 = mask of ones iff S2_LIMB < 0
	b	L1
	 add	%o4,-4,%o4
Loop:
	subcc	%o5,%g3,%g3
	ld	[%o1+%o2],%o5
	addx	%o0,%g0,%o0
	st	%g3,[%o4+%o2]
L1:	wr	%g0,%o5,%y
	and	%o5,%g4,%g2
	andcc	%g0,%g0,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%o3,%g1
	mulscc	%g1,%g0,%g1
	rd	%y,%g3
	addcc	%g3,%o0,%g3
	addx	%g2,%g1,%o0
	addcc	%o2,4,%o2
	bne	Loop
	 ld	[%o4+%o2],%o5

	subcc	%o5,%g3,%g3
	addx	%o0,%g0,%o0
	retl
	st	%g3,[%o4+%o2]