add_n.s revision 1.1.1.1 
1@ ARM/Thumb mpn_add_n -- Add two limb vectors of the same length > 0 and store
2@ sum in a third limb vector.
3
4@ Copyright 1997, 2000 Free Software Foundation, Inc.
5
6@ This file is part of the GNU MP Library.
7
8@ The GNU MP Library is free software; you can redistribute it and/or modify
9@ it under the terms of the GNU Lesser General Public License as published by
10@ the Free Software Foundation; either version 3 of the License, or (at your
11@ option) any later version.
12
13@ The GNU MP Library is distributed in the hope that it will be useful, but
14@ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15@ or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
16@ License for more details.
17
18@ You should have received a copy of the GNU Lesser General Public License
19@ along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.
20
21
22@ INPUT PARAMETERS
23@ RES_ptr	r0
24@ S1_ptr	r1
25@ S2_ptr	r2
26@ SIZE		r3
27
28@ NOT TESTED CODE
29
30	.text
31	.thumb
32	.align	0
33	.global	___gmpn_add_n
34___gmpn_add_n:
35	push	{r4, r5, r6, lr}
36	mov	r6, #1			@ init carry save register
37
38Loop:	sub	r6, #1			@ restore carry (set iff r6 was 0)
39	ldmia	r1!, {r4}		@ load next limb from S1
40	ldmia	r2!, {r5}		@ load next limb from S2
41	adc	r4, r5
42	stmia	r0!, {r4}		@ store result limb to RES
43	sbc	r6, r6			@ save negated carry
44	sub	r3, #1
45	bge	Loop			@ loop back while remaining count >= 4
46
47	mov	r0, r6
48	pop	{r4, r5, r6, pc}
49