86 lines
2.1 KiB
NASM
86 lines
2.1 KiB
NASM
|
dnl Pentium-4 mpn_copyi -- copy limb vector, incrementing.
|
||
|
|
dnl
|
||
|
|
|
||
|
|
dnl Copyright 1999, 2000, 2001 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., 51 Franklin Street,
|
||
|
|
dnl Fifth Floor, Boston, MA 02110-1301, USA.
|
||
|
|
|
||
|
|
|
||
|
|
dnl The rep/movsl is very slow for small blocks on pentium4. Its startup
|
||
|
|
dnl time seems to be about 110 cycles. It then copies at a rate of one
|
||
|
|
dnl limb per cycle. We therefore fall back to an open-coded 2 c/l copying
|
||
|
|
dnl loop for smaller sizes.
|
||
|
|
|
||
|
|
dnl Ultimately, we may want to use 64-bit movd or 128-bit movdqu in some
|
||
|
|
dnl nifty unrolled arrangement. Clearly, that could reach much higher
|
||
|
|
dnl speeds, at least for large blocks.
|
||
|
|
|
||
|
|
include(`../config.m4')
|
||
|
|
|
||
|
|
|
||
|
|
defframe(PARAM_SIZE, 12)
|
||
|
|
defframe(PARAM_SRC, 8)
|
||
|
|
defframe(PARAM_DST, 4)
|
||
|
|
|
||
|
|
TEXT
|
||
|
|
ALIGN(8)
|
||
|
|
|
||
|
|
PROLOGUE(mpn_copyi)
|
||
|
|
deflit(`FRAME',0)
|
||
|
|
|
||
|
|
movl PARAM_SIZE, %ecx
|
||
|
|
cmpl $150, %ecx
|
||
|
|
jg L(replmovs)
|
||
|
|
|
||
|
|
movl PARAM_SRC, %eax
|
||
|
|
movl PARAM_DST, %edx
|
||
|
|
movl %ebx, PARAM_SIZE
|
||
|
|
testl %ecx, %ecx
|
||
|
|
jz L(end)
|
||
|
|
|
||
|
|
L(loop):
|
||
|
|
movl (%eax), %ebx
|
||
|
|
leal 4(%eax), %eax
|
||
|
|
addl $-1, %ecx
|
||
|
|
movl %ebx, (%edx)
|
||
|
|
leal 4(%edx), %edx
|
||
|
|
|
||
|
|
jnz L(loop)
|
||
|
|
|
||
|
|
L(end):
|
||
|
|
movl PARAM_SIZE, %ebx
|
||
|
|
ret
|
||
|
|
|
||
|
|
L(replmovs):
|
||
|
|
cld C better safe than sorry, see mpn/x86/README
|
||
|
|
|
||
|
|
movl %esi, %eax
|
||
|
|
movl PARAM_SRC, %esi
|
||
|
|
movl %edi, %edx
|
||
|
|
movl PARAM_DST, %edi
|
||
|
|
|
||
|
|
rep
|
||
|
|
movsl
|
||
|
|
|
||
|
|
movl %eax, %esi
|
||
|
|
movl %edx, %edi
|
||
|
|
|
||
|
|
ret
|
||
|
|
|
||
|
|
EPILOGUE()
|