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61 lines
2.1 KiB
ArmAsm
61 lines
2.1 KiB
ArmAsm
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/* __mpn_sub_n -- Add two limb vectors of the same length > 0 and store
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sum in a third limb vector. 64 bit S/390 version.
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Copyright (C) 2001 Free Software Foundation, Inc.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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This file is part of the GNU MP Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* INPUT PARAMETERS
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%r2 = res_ptr
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%r3 = s1_ptr
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%r4 = s2_ptr
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%r5 = size. */
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#include "sysdep.h"
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#include "asm-syntax.h"
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ENTRY(__mpn_sub_n)
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stg %r6,48(%r15) # save register 6
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sgr %r1,%r1
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lghi %r0,1 # cannot use ahi to add carry, use slr
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.L0: lg %r6,0(%r1,%r3) # .L0 -> no carry from last sub
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slg %r6,0(%r1,%r4)
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stg %r6,0(%r1,%r2)
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la %r1,8(%r1)
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brc 4,.L3
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.L1: brct %r5,.L0
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slgr %r2,%r2 # no last carry to return
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j .Lexit
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.L2: lg %r6,0(%r1,%r3) # .L2 -> carry from last sub
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slg %r6,0(%r1,%r4)
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brc 4,.L4
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slgr %r6,%r0 # no carry yet, add carry from last sub
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stg %r6,0(%r1,%r2)
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la %r1,8(%r1)
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brc 11,.L1 # new carry ?
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.L3: brct %r5,.L2
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lgr %r2,%r0 # return last carry
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j .Lexit
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.L4: slgr %r6,%r0 # already a carry, add carry from last sub
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stg %r6,0(%r1,%r2)
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la %r1,8(%r1)
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brct %r5,.L2
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lgr %r2,%r0 # return last carry
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.Lexit: lg %r6,48(%r15) # restore register 6
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br %r14
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END(__mpn_sub_n)
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