1# I960 __gmpn_sub_n -- Subtract two limb vectors of the same length > 0 and
2# store difference in a third limb vector.
3
4# Copyright 1995, 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.text
22	.align 4
23	.globl ___gmpn_sub_n
24___gmpn_sub_n:
25	mov	1,g6		# set carry-save register
26	cmpo	1,0		# clear cy
27
28Loop:	subo	1,g3,g3		# update loop counter
29	ld	(g1),g5		# load from s1_ptr
30	addo	4,g1,g1		# s1_ptr++
31	ld	(g2),g4		# load from s2_ptr
32	addo	4,g2,g2		# s2_ptr++
33	cmpo	g6,1		# restore cy from g6, relies on cy being 0
34	subc	g4,g5,g4	# main subtract
35	subc	0,0,g6		# save cy in g6
36	st	g4,(g0)		# store result to res_ptr
37	addo	4,g0,g0		# res_ptr++
38	cmpobne	0,g3,Loop	# when branch is taken, cy will be 0
39
40	mov	g6,g0
41	ret
42