1 /* __mpn_sub_n -- Add two limb vectors of the same length > 0 and store
2 sum in a third limb vector.
3 Copyright (C) 2000-2015 Free Software Foundation, Inc.
4 Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
5 This file is part of the GNU MP Library.
7 The GNU MP Library is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 2.1 of the License, or (at your
10 option) any later version.
12 The GNU MP Library is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15 License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with the GNU MP Library; see the file COPYING.LIB. If not,
19 see <http://www.gnu.org/licenses/>. */
30 #include "asm-syntax.h"
33 st %r6,24(%r15) # save register 6
36 lhi %r0,1 # cannot use ahi to add carry, use slr
37 .L0: l %r6,0(%r1,%r3) # .L0 -> no carry from last sub
43 slr %r2,%r2 # no last carry to return
45 .L2: l %r6,0(%r1,%r3) # .L2 -> carry from last sub
48 slr %r6,%r0 # no carry yet, add carry from last sub
51 brc 11,.L1 # new carry ?
53 lr %r2,%r0 # return last carry
55 .L4: slr %r6,%r0 # already a carry, add carry from last sub
59 lr %r2,%r0 # return last carry
60 .Lexit: l %r6,24(%r15) # restore register 6