189 lines
3.9 KiB
NASM
189 lines
3.9 KiB
NASM
dnl Intel Pentium 4 mpn_popcount, mpn_hamdist -- population count and
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dnl hamming distance.
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dnl Copyright 2000, 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 P4: popcount 8.5 cycles/limb
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C hamdist 9.5 cycles/limb
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C unsigned long mpn_popcount (mp_srcptr src, mp_size_t size);
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C unsigned long mpn_hamdist (mp_srcptr src, mp_srcptr src2, mp_size_t size);
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C
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C Loading with unaligned movq's costs an extra 1 c/l and hence is avoided.
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C Two movd's and a punpckldq seems to be the same speed as an aligned movq,
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C and using them saves fiddling about with alignment testing on entry.
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C
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C For popcount there's 13 mmx instructions in the loop, so perhaps 6.5 c/l
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C might be possible, but 8.5 c/l relying on out-of-order execution is
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C already quite reasonable.
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define(OPERATION_popcount,1)
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ifdef(`OPERATION_popcount',,
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`ifdef(`OPERATION_hamdist',,
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`m4_error(`Need OPERATION_popcount or OPERATION_hamdist defined
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')')')
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define(HAM,
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m4_assert_numargs(1)
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`ifdef(`OPERATION_hamdist',`$1')')
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define(POP,
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m4_assert_numargs(1)
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`ifdef(`OPERATION_popcount',`$1')')
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HAM(`
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defframe(PARAM_SIZE, 12)
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defframe(PARAM_SRC2, 8)
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defframe(PARAM_SRC, 4)
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define(M4_function,mpn_hamdist)
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')
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POP(`
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defframe(PARAM_SIZE, 8)
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defframe(PARAM_SRC, 4)
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define(M4_function,mpn_popcount)
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')
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ifdef(`PIC',,`
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dnl non-PIC
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RODATA
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ALIGN(8)
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L(rodata_AAAAAAAAAAAAAAAA):
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.long 0xAAAAAAAA
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.long 0xAAAAAAAA
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L(rodata_3333333333333333):
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.long 0x33333333
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.long 0x33333333
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L(rodata_0F0F0F0F0F0F0F0F):
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.long 0x0F0F0F0F
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.long 0x0F0F0F0F
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')
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TEXT
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ALIGN(16)
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PROLOGUE(M4_function)
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deflit(`FRAME',0)
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movl PARAM_SIZE, %ecx
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movl PARAM_SRC, %eax
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ifdef(`PIC',`
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movl $0xAAAAAAAA, %edx
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movd %edx, %mm7
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punpckldq %mm7, %mm7
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movl $0x33333333, %edx
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movd %edx, %mm6
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punpckldq %mm6, %mm6
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movl $0x0F0F0F0F, %edx
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movd %edx, %mm5
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punpckldq %mm5, %mm5
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HAM(` movl PARAM_SRC2, %edx')
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',`
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dnl non-PIC
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HAM(` movl PARAM_SRC2, %edx')
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movq L(rodata_AAAAAAAAAAAAAAAA), %mm7
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movq L(rodata_3333333333333333), %mm6
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movq L(rodata_0F0F0F0F0F0F0F0F), %mm5
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')
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pxor %mm4, %mm4 C zero
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pxor %mm0, %mm0 C total
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subl $1, %ecx
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ja L(top)
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L(last):
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movd (%eax,%ecx,4), %mm1 C src high limb
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HAM(` movd (%edx,%ecx,4), %mm2
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pxor %mm2, %mm1
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')
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jmp L(loaded)
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L(top):
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C eax src
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C ebx
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C ecx counter, size-1 to 2 or 1, inclusive
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C edx [hamdist] src2
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C
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C mm0 total (low dword)
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C mm1 (scratch)
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C mm2 (scratch)
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C mm3
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C mm4 0x0000000000000000
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C mm5 0x0F0F0F0F0F0F0F0F
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C mm6 0x3333333333333333
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C mm7 0xAAAAAAAAAAAAAAAA
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movd (%eax), %mm1
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movd 4(%eax), %mm2
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punpckldq %mm2, %mm1
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addl $8, %eax
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HAM(` movd (%edx), %mm2
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movd 4(%edx), %mm3
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punpckldq %mm3, %mm2
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pxor %mm2, %mm1
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addl $8, %edx
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')
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L(loaded):
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movq %mm7, %mm2
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pand %mm1, %mm2
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psrlq $1, %mm2
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psubd %mm2, %mm1 C bit pairs
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movq %mm6, %mm2
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pand %mm1, %mm2
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psrlq $2, %mm1
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pand %mm6, %mm1
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paddd %mm2, %mm1 C nibbles
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movq %mm5, %mm2
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pand %mm1, %mm2
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psrlq $4, %mm1
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pand %mm5, %mm1
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paddd %mm2, %mm1 C bytes
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psadbw( %mm4, %mm1)
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paddd %mm1, %mm0 C to total
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subl $2, %ecx
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jg L(top)
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C ecx is 0 or -1 representing respectively 1 or 0 further limbs
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jz L(last)
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movd %mm0, %eax
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emms
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ret
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EPILOGUE()
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