diff options
Diffstat (limited to 'sysdeps/s390/s390-64/add_n.S')
| -rw-r--r-- | sysdeps/s390/s390-64/add_n.S | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/sysdeps/s390/s390-64/add_n.S b/sysdeps/s390/s390-64/add_n.S new file mode 100644 index 0000000000..734b7736e5 --- /dev/null +++ b/sysdeps/s390/s390-64/add_n.S @@ -0,0 +1,63 @@ +/* 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) |