49 lines
1.4 KiB
ArmAsm
49 lines
1.4 KiB
ArmAsm
; Clipper __gmpn_sub_n -- Subtract two limb vectors of the same length > 0 and
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; store difference in a third limb vector.
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; Copyright 1995, 2000 Free Software Foundation, Inc.
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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, write to
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; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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; MA 02110-1301, USA.
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.text
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.align 16
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.globl ___gmpn_sub_n
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___gmpn_sub_n:
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subq $8,sp
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storw r6,(sp)
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loadw 12(sp),r2
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loadw 16(sp),r3
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loadq $0,r6 ; clear carry-save register
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.Loop: loadw (r1),r4
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loadw (r2),r5
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addwc r6,r6 ; restore carry from r6
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subwc r5,r4
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storw r4,(r0)
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subwc r6,r6 ; save carry in r6
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addq $4,r0
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addq $4,r1
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addq $4,r2
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subq $1,r3
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brne .Loop
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negw r6,r0
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loadw (sp),r6
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addq $8,sp
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ret sp
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