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63 lines
2.0 KiB
ArmAsm
63 lines
2.0 KiB
ArmAsm
/* __mpn_sub_n -- Add two limb vectors of the same length > 0 and store
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sum in a third limb vector.
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Copyright (C) 2000-2017 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 MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not,
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see <http://www.gnu.org/licenses/>. */
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/*
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INPUT PARAMETERS
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res_ptr %r2
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s1_ptr %r3
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s2_ptr %r4
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size %r5
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*/
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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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st %r6,24(%r15) # save register 6
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cfi_offset (%r6, -72)
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sr %r1,%r1
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lhi %r0,1 # cannot use ahi to add carry, use slr
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.L0: l %r6,0(%r1,%r3) # .L0 -> no carry from last sub
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sl %r6,0(%r1,%r4)
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st %r6,0(%r1,%r2)
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la %r1,4(0,%r1)
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brc 4,.L3
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.L1: brct %r5,.L0
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slr %r2,%r2 # no last carry to return
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j .Lexit
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.L2: l %r6,0(%r1,%r3) # .L2 -> carry from last sub
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sl %r6,0(%r1,%r4)
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brc 4,.L4
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slr %r6,%r0 # no carry yet, add carry from last sub
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st %r6,0(%r1,%r2)
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la %r1,4(0,%r1)
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brc 11,.L1 # new carry ?
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.L3: brct %r5,.L2
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lr %r2,%r0 # return last carry
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j .Lexit
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.L4: slr %r6,%r0 # already a carry, add carry from last sub
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st %r6,0(%r1,%r2)
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la %r1,4(0,%r1)
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brct %r5,.L2
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lr %r2,%r0 # return last carry
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.Lexit: l %r6,24(%r15) # restore register 6
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br %r14
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END(__mpn_sub_n)
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