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dnl x86 mpn_copyd -- copy limb vector, decrementing.
dnl
dnl Future: On P6 an MMX loop should be able to go faster than this code.
dnl Copyright (C) 1999, 2000 Free Software Foundation, Inc.
dnl
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
dnl modify it under the terms of the GNU Lesser General Public License as
dnl published by the Free Software Foundation; either version 2.1 of the
dnl License, or (at your option) any later version.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
dnl Lesser General Public License for more details.
dnl
dnl You should have received a copy of the GNU Lesser General Public
dnl License along with the GNU MP Library; see the file COPYING.LIB. If
dnl not, write to the Free Software Foundation, Inc., 59 Temple Place -
dnl Suite 330, Boston, MA 02111-1307, USA.
include(`../config.m4')
C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size);
C
C Copy src,size to dst,size, working from high to low addresses.
C
C The code here is very generic and can be expected to be reasonable on all
C the x86 family.
C
C P5 - 1.0 cycles/limb.
C
C P6 - 2.4 cycles/limb, approx 40 cycles startup.
defframe(PARAM_SIZE,12)
defframe(PARAM_SRC, 8)
defframe(PARAM_DST, 4)
deflit(`FRAME',0)
.text
ALIGN(32)
PROLOGUE(mpn_copyd)
C eax saved esi
C ebx
C ecx counter
C edx saved edi
C esi src
C edi dst
C ebp
movl PARAM_SIZE, %ecx
movl %esi, %eax
movl PARAM_SRC, %esi
movl %edi, %edx
movl PARAM_DST, %edi
leal -4(%esi,%ecx,4), %esi
leal -4(%edi,%ecx,4), %edi
std
rep
movsl
cld
movl %eax, %esi
movl %edx, %edi
ret
EPILOGUE()
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