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/* Add two limb vectors of the same length > 0 and store sum in a third
limb vector.
Copyright (C) 2001 Free Software Foundation, Inc.
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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 Library General Public License as published by
the Free Software Foundation; either version 2 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 Library General Public
License for more details.
You should have received a copy of the GNU Library 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
res_ptr %r2
s1_ptr %r3
s2_ptr %r4
size %r5
*/
#include "sysdep.h"
#include "asm-syntax.h"
.text
ENTRY(__mpn_add_n)
stg %r6,48(%r15) # save register 6
slgr %r1,%r1
lghi %r0,1 # cannot use ahi to add carry, use alr
.L0: lg %r6,0(%r1,%r3) # .L0 -> no carry from last add
alg %r6,0(%r1,%r4)
stg %r6,0(%r1,%r2)
la %r1,8(%r1)
brc 3,.L3
.L1: brct %r5,.L0
slgr %r2,%r2 # no last carry to return
j .Lexit
.L2: lg %r6,0(%r1,%r3) # .L2 -> carry from last add
alg %r6,0(%r1,%r4)
brc 3,.L4
algr %r6,%r0 # no carry yet, add carry from last add
stg %r6,0(%r1,%r2)
la %r1,8(%r1)
brc 12,.L1 # new carry ?
.L3: brct %r5,.L2
lgr %r2,%r0 # return last carry
j .Lexit
.L4: algr %r6,%r0 # already a carry, add carry from last add
stg %r6,0(%r1,%r2)
la %r1,8(%r1)
brct %r5,.L2
lgr %r2,%r0 # return last carry
.Lexit: lg %r6,48(%r15) # restore register 6
br %r14
END(__mpn_add_n)
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