135 lines
2.9 KiB
NASM
135 lines
2.9 KiB
NASM
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dnl Intel P5 mpn_hamdist -- mpn hamming distance.
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dnl Copyright 2001, 2002 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: 14.0 cycles/limb
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C unsigned long mpn_hamdist (mp_srcptr src1, mp_srcptr src2, mp_size_t size);
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C
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C It might be possible to shave 1 cycle from the loop, and hence 2
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C cycles/limb. The xorb is taking 2 cycles, but a separate load and xor
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C would be 1, if the right schedule could be found (not found so far).
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C Wanting to avoid potential cache bank clashes makes it tricky.
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C The slightly strange quoting here helps the renaming done by tune/many.pl.
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deflit(TABLE_NAME,
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m4_assert_defined(`GSYM_PREFIX')
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GSYM_PREFIX`'mpn_popcount``'_table')
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defframe(PARAM_SIZE,12)
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defframe(PARAM_SRC2, 8)
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defframe(PARAM_SRC1, 4)
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TEXT
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ALIGN(8)
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PROLOGUE(mpn_hamdist)
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deflit(`FRAME',0)
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movl PARAM_SIZE, %ecx
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pushl %esi FRAME_pushl()
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shll %ecx C size in byte pairs
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pushl %edi FRAME_pushl()
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ifdef(`PIC',`
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pushl %ebx FRAME_pushl()
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pushl %ebp FRAME_pushl()
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call L(here) FRAME_pushl()
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L(here):
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movl PARAM_SRC1, %esi
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popl %ebp FRAME_popl()
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movl PARAM_SRC2, %edi
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addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ebp
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xorl %ebx, %ebx C byte
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xorl %edx, %edx C byte
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movl TABLE_NAME@GOT(%ebp), %ebp
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xorl %eax, %eax C total
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define(TABLE,`(%ebp,$1)')
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',`
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dnl non-PIC
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movl PARAM_SRC1, %esi
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movl PARAM_SRC2, %edi
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xorl %eax, %eax C total
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pushl %ebx FRAME_pushl()
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xorl %edx, %edx C byte
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xorl %ebx, %ebx C byte
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define(TABLE,`TABLE_NAME($1)')
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')
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C The nop after the xorb seems necessary. Although a movb might be
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C expected to go down the V pipe in the second cycle of the xorb, it
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C doesn't and costs an extra 2 cycles.
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L(top):
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C eax total
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C ebx byte
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C ecx counter, 2*size to 2
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C edx byte
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C esi src1
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C edi src2
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C ebp [PIC] table
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addl %ebx, %eax
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movb -1(%esi,%ecx,2), %bl
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addl %edx, %eax
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movb -1(%edi,%ecx,2), %dl
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xorb %dl, %bl
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movb -2(%esi,%ecx,2), %dl
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xorb -2(%edi,%ecx,2), %dl
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nop
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movb TABLE(%ebx), %bl
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decl %ecx
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movb TABLE(%edx), %dl
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jnz L(top)
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ifdef(`PIC',`
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popl %ebp
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')
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addl %ebx, %eax
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popl %ebx
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addl %edx, %eax
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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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