51 lines
1.5 KiB
ArmAsm
51 lines
1.5 KiB
ArmAsm
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@ ARM/Thumb mpn_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 1997, 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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@ INPUT PARAMETERS
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@ RES_ptr r0
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@ S1_ptr r1
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@ S2_ptr r2
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@ SIZE r3
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@ NOT TESTED CODE
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.text
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.thumb
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.align 0
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.global ___gmpn_sub_n
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___gmpn_sub_n:
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push {r4, r5, r6, lr}
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mov r6, #1 @ init carry save register
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Loop: sub r6, #1 @ restore carry (set iff r6 was 0)
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ldmia r1!, {r4} @ load next limb from S1
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ldmia r2!, {r5} @ load next limb from S2
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sbc r4, r5
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stmia r0!, {r4} @ store result limb to RES
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sbc r6, r6 @ save negated carry
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sub r3, #1
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bge Loop @ loop back while remaining count >= 4
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mov r0, r6
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pop {r4, r5, r6, pc}
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