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dnl ARM/Thumb mpn_sub_n.
dnl Copyright 1997, 2000, 2012 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 3 of the License, or (at
dnl your option) any later version.
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
dnl License for more details.
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see https://www.gnu.org/licenses/.
include(`../config.m4')
C INPUT PARAMETERS
define(`rp', r0)
define(`up', r1)
define(`vp', r2)
define(`n', r3)
ASM_START()
.thumb
PROLOGUE(mpn_sub_nc)
push {r4, r5, r6}
ldr r6, [sp, #12] C init carry save register
neg r6, r6
b L(top)
EPILOGUE()
PROLOGUE(mpn_sub_n)
push {r4, r5, r6}
mov r6, n C init carry save register
L(top): ldmia up!, {r4} C load next limb from S1
cmp n, r6 C tricky carry restore
ldmia vp!, {r5} C load next limb from S2
sbc r4, r5
stmia rp!, {r4} C store result limb to RES
sbc r6, r6 C save negated carry
sub n, #1
bne L(top)
neg r0, r6
pop {r4, r5, r6}
bx lr
EPILOGUE()
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