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dnl VAX mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
dnl store difference in a third limb vector.
dnl Copyright 1999, 2000, 2012 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
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 General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
ASM_START()
PROLOGUE(mpn_sub_n)
.word 0x0
movl 16(ap), r0
movl 12(ap), r1
movl 8(ap), r2
movl 4(ap), r3
mnegl r0, r5
addl2 $3, r0
ashl $-2, r0, r0 C unroll loop count
bicl2 $-4, r5 C mask out low 2 bits
movaq (r5)[r5], r5 C 9x
jmp L(top)[r5]
L(top): movl (r2)+, r4
sbwc (r1)+, r4
movl r4, (r3)+
movl (r2)+, r4
sbwc (r1)+, r4
movl r4, (r3)+
movl (r2)+, r4
sbwc (r1)+, r4
movl r4, (r3)+
movl (r2)+, r4
sbwc (r1)+, r4
movl r4, (r3)+
sobgtr r0, L(top)
adwc r0, r0
ret
EPILOGUE()
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