138 lines
2.8 KiB
NASM
138 lines
2.8 KiB
NASM
dnl Intel Pentium mpn_copyd -- copy limb vector, decrementing.
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dnl Copyright 1996, 2001, 2002, 2006 Free Software Foundation, Inc.
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dnl
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or
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dnl modify it under the terms of the GNU Lesser General Public License as
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dnl published by the Free Software Foundation; either version 2.1 of the
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dnl License, or (at your option) any later version.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful,
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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dnl Lesser General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU Lesser General Public
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dnl License along with the GNU MP Library; see the file COPYING.LIB. If
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dnl not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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dnl Fifth Floor, Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C P5: 1.25 cycles/limb
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C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size);
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C
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C See comments in copyi.asm.
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defframe(PARAM_SIZE,12)
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defframe(PARAM_SRC, 8)
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defframe(PARAM_DST, 4)
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TEXT
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ALIGN(8)
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PROLOGUE(mpn_copyd)
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deflit(`FRAME',0)
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movl PARAM_SRC, %eax
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movl PARAM_SIZE, %ecx
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pushl %esi FRAME_pushl()
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pushl %edi FRAME_pushl()
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leal -4(%eax,%ecx,4), %eax C &src[size-1]
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movl PARAM_DST, %edx
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subl $7, %ecx C size-7
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jle L(end)
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movl 28-4(%edx,%ecx,4), %esi C prefetch cache, dst[size-1]
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nop
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L(top):
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C eax src, decrementing
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C ebx
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C ecx counter, limbs
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C edx dst
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C esi scratch
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C edi scratch
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C ebp
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movl 28-32(%edx,%ecx,4), %esi C prefetch dst cache line
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subl $8, %ecx
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movl (%eax), %esi C read words pairwise
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movl -4(%eax), %edi
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movl %esi, 56(%edx,%ecx,4) C store words pairwise
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movl %edi, 52(%edx,%ecx,4)
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movl -8(%eax), %esi
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movl -12(%eax), %edi
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movl %esi, 48(%edx,%ecx,4)
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movl %edi, 44(%edx,%ecx,4)
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movl -16(%eax), %esi
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movl -20(%eax), %edi
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movl %esi, 40(%edx,%ecx,4)
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movl %edi, 36(%edx,%ecx,4)
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movl -24(%eax), %esi
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movl -28(%eax), %edi
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movl %esi, 32(%edx,%ecx,4)
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movl %edi, 28(%edx,%ecx,4)
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leal -32(%eax), %eax
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jg L(top)
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L(end):
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C ecx -7 to 0, representing respectively 0 to 7 limbs remaining
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C eax src end
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C edx dst, next location to store
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addl $4, %ecx
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jle L(no4)
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movl (%eax), %esi
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movl -4(%eax), %edi
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movl %esi, 8(%edx,%ecx,4)
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movl %edi, 4(%edx,%ecx,4)
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movl -8(%eax), %esi
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movl -12(%eax), %edi
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movl %esi, (%edx,%ecx,4)
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movl %edi, -4(%edx,%ecx,4)
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subl $16, %eax
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subl $4, %ecx
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L(no4):
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addl $2, %ecx
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jle L(no2)
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movl (%eax), %esi
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movl -4(%eax), %edi
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movl %esi, (%edx,%ecx,4)
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movl %edi, -4(%edx,%ecx,4)
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subl $8, %eax
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subl $2, %ecx
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L(no2):
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jnz L(done)
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movl (%eax), %ecx
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movl %ecx, (%edx) C risk of cache bank clash here
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L(done):
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popl %edi
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popl %esi
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ret
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EPILOGUE()
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