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dnl Intel Pentium mpn_copyd -- copy limb vector, decrementing.
dnl
dnl P5: 1.25 cycles/limb
dnl Copyright 1996, 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., 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 See comments in copyi.asm.
defframe(PARAM_SIZE,12)
defframe(PARAM_SRC, 8)
defframe(PARAM_DST, 4)
PROLOGUE(mpn_copyd)
deflit(`FRAME',0)
movl PARAM_SRC, %eax
movl PARAM_SIZE, %ecx
pushl %esi FRAME_pushl()
pushl %edi FRAME_pushl()
leal -4(%eax,%ecx,4), %eax C &src[size-1]
movl PARAM_DST, %edx
subl $7, %ecx C size-7
jle L(end)
movl 28-4(%edx,%ecx,4), %esi C prefetch cache, dst[size-1]
nop
L(top):
C eax src, decrementing
C ebx
C ecx counter, limbs
C edx dst
C esi scratch
C edi scratch
C ebp
movl 28-32(%edx,%ecx,4), %esi C prefetch dst cache line
subl $8, %ecx
movl (%eax), %esi C read words pairwise
movl -4(%eax), %edi
movl %esi, 56(%edx,%ecx,4) C store words pairwise
movl %edi, 52(%edx,%ecx,4)
movl -8(%eax), %esi
movl -12(%eax), %edi
movl %esi, 48(%edx,%ecx,4)
movl %edi, 44(%edx,%ecx,4)
movl -16(%eax), %esi
movl -20(%eax), %edi
movl %esi, 40(%edx,%ecx,4)
movl %edi, 36(%edx,%ecx,4)
movl -24(%eax), %esi
movl -28(%eax), %edi
movl %esi, 32(%edx,%ecx,4)
movl %edi, 28(%edx,%ecx,4)
leal -32(%eax), %eax
jg L(top)
L(end):
C ecx -7 to 0, representing respectively 0 to 7 limbs remaining
C eax src end
C edx dst, next location to store
addl $4, %ecx
jle L(no4)
movl (%eax), %esi
movl -4(%eax), %edi
movl %esi, 8(%edx,%ecx,4)
movl %edi, 4(%edx,%ecx,4)
movl -8(%eax), %esi
movl -12(%eax), %edi
movl %esi, (%edx,%ecx,4)
movl %edi, -4(%edx,%ecx,4)
subl $16, %eax
subl $4, %ecx
L(no4):
addl $2, %ecx
jle L(no2)
movl (%eax), %esi
movl -4(%eax), %edi
movl %esi, (%edx,%ecx,4)
movl %edi, -4(%edx,%ecx,4)
subl $8, %eax
subl $2, %ecx
L(no2):
jnz L(done)
movl (%eax), %ecx
movl %ecx, (%edx) C risk of cache bank clash here
L(done):
popl %edi
popl %esi
ret
EPILOGUE()
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