aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/m88k/m88110/add_n.S
blob: 3c906744836c43e04264446310d64636c8ae60d5 (plain)
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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
; mc88110 __mpn_add_n -- Add two limb vectors of the same length > 0 and store
; sum in a third limb vector.

; 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 Lesser General Public License as published by
; the Free Software Foundation; either version 2.1 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 Lesser General Public
; License for more details.

; You should have received a copy of the GNU Lesser 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
#define res_ptr	r2
#define s1_ptr	r3
#define s2_ptr	r4
#define size	r5

#include "sysdep.h"

	text
	align	16
	global	C_SYMBOL_NAME(__mpn_add_n)
C_SYMBOL_NAME(__mpn_add_n):
	addu.co	 r0,r0,r0		; clear cy flag
	xor	 r12,s2_ptr,res_ptr
	bb1	 2,r12,L1
; **  V1a  **
L0:	bb0	 2,res_ptr,L_v1		; branch if res_ptr is aligned?
/* Add least significant limb separately to align res_ptr and s2_ptr */
	ld	 r10,s1_ptr,0
	addu	 s1_ptr,s1_ptr,4
	ld	 r8,s2_ptr,0
	addu	 s2_ptr,s2_ptr,4
	subu	 size,size,1
	addu.co	 r6,r10,r8
	st	 r6,res_ptr,0
	addu	 res_ptr,res_ptr,4
L_v1:	cmp	 r12,size,2
	bb1	 lt,r12,Lend2

	ld	 r10,s1_ptr,0
	ld	 r12,s1_ptr,4
	ld.d	 r8,s2_ptr,0
	subu	 size,size,10
	bcnd	 lt0,size,Lfin1
/* Add blocks of 8 limbs until less than 8 limbs remain */
	align	 8
Loop1:	subu	 size,size,8
	addu.cio r6,r10,r8
	ld	 r10,s1_ptr,8
	addu.cio r7,r12,r9
	ld	 r12,s1_ptr,12
	ld.d	 r8,s2_ptr,8
	st.d	 r6,res_ptr,0
	addu.cio r6,r10,r8
	ld	 r10,s1_ptr,16
	addu.cio r7,r12,r9
	ld	 r12,s1_ptr,20
	ld.d	 r8,s2_ptr,16
	st.d	 r6,res_ptr,8
	addu.cio r6,r10,r8
	ld	 r10,s1_ptr,24
	addu.cio r7,r12,r9
	ld	 r12,s1_ptr,28
	ld.d	 r8,s2_ptr,24
	st.d	 r6,res_ptr,16
	addu.cio r6,r10,r8
	ld	 r10,s1_ptr,32
	addu.cio r7,r12,r9
	ld	 r12,s1_ptr,36
	addu	 s1_ptr,s1_ptr,32
	ld.d	 r8,s2_ptr,32
	addu	 s2_ptr,s2_ptr,32
	st.d	 r6,res_ptr,24
	addu	 res_ptr,res_ptr,32
	bcnd	 ge0,size,Loop1

Lfin1:	addu	 size,size,8-2
	bcnd	 lt0,size,Lend1
/* Add blocks of 2 limbs until less than 2 limbs remain */
Loope1:	addu.cio r6,r10,r8
	ld	 r10,s1_ptr,8
	addu.cio r7,r12,r9
	ld	 r12,s1_ptr,12
	ld.d	 r8,s2_ptr,8
	st.d	 r6,res_ptr,0
	subu	 size,size,2
	addu	 s1_ptr,s1_ptr,8
	addu	 s2_ptr,s2_ptr,8
	addu	 res_ptr,res_ptr,8
	bcnd	 ge0,size,Loope1
Lend1:	addu.cio r6,r10,r8
	addu.cio r7,r12,r9
	st.d	 r6,res_ptr,0

	bb0	 0,size,Lret1
/* Add last limb */
	ld	 r10,s1_ptr,8
	ld	 r8,s2_ptr,8
	addu.cio r6,r10,r8
	st	 r6,res_ptr,8

Lret1:	jmp.n	 r1
	addu.ci	 r2,r0,r0		; return carry-out from most sign. limb

L1:	xor	 r12,s1_ptr,res_ptr
	bb1	 2,r12,L2
; **  V1b  **
	or	 r12,r0,s2_ptr
	or	 s2_ptr,r0,s1_ptr
	or	 s1_ptr,r0,r12
	br	 L0

; **  V2  **
/* If we come here, the alignment of s1_ptr and res_ptr as well as the
   alignment of s2_ptr and res_ptr differ.  Since there are only two ways
   things can be aligned (that we care about) we now know that the alignment
   of s1_ptr and s2_ptr are the same.  */

L2:	cmp	 r12,size,1
	bb1	 eq,r12,Ljone
	bb0	 2,s1_ptr,L_v2		; branch if s1_ptr is aligned
/* Add least significant limb separately to align res_ptr and s2_ptr */
	ld	 r10,s1_ptr,0
	addu	 s1_ptr,s1_ptr,4
	ld	 r8,s2_ptr,0
	addu	 s2_ptr,s2_ptr,4
	subu	 size,size,1
	addu.co	 r6,r10,r8
	st	 r6,res_ptr,0
	addu	 res_ptr,res_ptr,4

L_v2:	subu	 size,size,8
	bcnd	 lt0,size,Lfin2
/* Add blocks of 8 limbs until less than 8 limbs remain */
	align	 8
Loop2:	subu	 size,size,8
	ld.d	 r8,s1_ptr,0
	ld.d	 r6,s2_ptr,0
	addu.cio r8,r8,r6
	st	 r8,res_ptr,0
	addu.cio r9,r9,r7
	st	 r9,res_ptr,4
	ld.d	 r8,s1_ptr,8
	ld.d	 r6,s2_ptr,8
	addu.cio r8,r8,r6
	st	 r8,res_ptr,8
	addu.cio r9,r9,r7
	st	 r9,res_ptr,12
	ld.d	 r8,s1_ptr,16
	ld.d	 r6,s2_ptr,16
	addu.cio r8,r8,r6
	st	 r8,res_ptr,16
	addu.cio r9,r9,r7
	st	 r9,res_ptr,20
	ld.d	 r8,s1_ptr,24
	ld.d	 r6,s2_ptr,24
	addu.cio r8,r8,r6
	st	 r8,res_ptr,24
	addu.cio r9,r9,r7
	st	 r9,res_ptr,28
	addu	 s1_ptr,s1_ptr,32
	addu	 s2_ptr,s2_ptr,32
	addu	 res_ptr,res_ptr,32
	bcnd	 ge0,size,Loop2

Lfin2:	addu	 size,size,8-2
	bcnd	 lt0,size,Lend2
Loope2:	ld.d	 r8,s1_ptr,0
	ld.d	 r6,s2_ptr,0
	addu.cio r8,r8,r6
	st	 r8,res_ptr,0
	addu.cio r9,r9,r7
	st	 r9,res_ptr,4
	subu	 size,size,2
	addu	 s1_ptr,s1_ptr,8
	addu	 s2_ptr,s2_ptr,8
	addu	 res_ptr,res_ptr,8
	bcnd	 ge0,size,Loope2
Lend2:	bb0	 0,size,Lret2
/* Add last limb */
Ljone:	ld	 r10,s1_ptr,0
	ld	 r8,s2_ptr,0
	addu.cio r6,r10,r8
	st	 r6,res_ptr,0

Lret2:	jmp.n	 r1
	addu.ci	 r2,r0,r0		; return carry-out from most sign. limb