1 /* __mpn_sub_n -- Add two limb vectors of the same length > 0 and store
2 sum in a third limb vector. 64 bit S/390 version.
3 Copyright (C) 2001 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 C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public License as
9 published by the Free Software Foundation; either version 2.1 of the
10 License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; see the file COPYING.LIB. If not,
19 see <http://www.gnu.org/licenses/>. */
28 #include "asm-syntax.h"
31 stg %r6,48(%r15) # save register 6
34 lghi %r0,1 # cannot use ahi to add carry, use slr
35 .L0: lg %r6,0(%r1,%r3) # .L0 -> no carry from last sub
41 slgr %r2,%r2 # no last carry to return
43 .L2: lg %r6,0(%r1,%r3) # .L2 -> carry from last sub
46 slgr %r6,%r0 # no carry yet, add carry from last sub
49 brc 11,.L1 # new carry ?
51 lgr %r2,%r0 # return last carry
53 .L4: slgr %r6,%r0 # already a carry, add carry from last sub
57 lgr %r2,%r0 # return last carry
58 .Lexit: lg %r6,48(%r15) # restore register 6