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158 lines
3.3 KiB
NASM
158 lines
3.3 KiB
NASM
dnl AMD64 mpn_popcount, mpn_hamdist -- population count and hamming distance.
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dnl Copyright 2004, 2005, 2007 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 3 of the License, or (at
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dnl your option) any later version.
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
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include(`../config.m4')
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C popcount hamdist
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C cycles/limb cycles/limb
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C K8,K9: 6 7
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C K10: 6 7
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C P4: 12 14.3
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C P6-15: 7 8
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C TODO
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C * Tune. It should be possible to reach 5 c/l for popcount and 6 c/l for
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C hamdist for K8/K9.
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ifdef(`OPERATION_popcount',`
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define(`func',`mpn_popcount')
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define(`up', `%rdi')
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define(`n', `%rsi')
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define(`h55555555', `%r10')
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define(`h33333333', `%r11')
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define(`h0f0f0f0f', `%rcx')
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define(`h01010101', `%rdx')
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define(`HAM', `dnl')
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')
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ifdef(`OPERATION_hamdist',`
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define(`func',`mpn_hamdist')
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define(`up', `%rdi')
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define(`vp', `%rsi')
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define(`n', `%rdx')
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define(`h55555555', `%r10')
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define(`h33333333', `%r11')
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define(`h0f0f0f0f', `%rcx')
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define(`h01010101', `%r14')
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define(`HAM', `$1')
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')
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MULFUNC_PROLOGUE(mpn_popcount mpn_hamdist)
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ASM_START()
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TEXT
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ALIGN(32)
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PROLOGUE(func)
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pushq %r12
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pushq %r13
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HAM(` pushq %r14 ')
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movq $0x5555555555555555, h55555555
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movq $0x3333333333333333, h33333333
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movq $0x0f0f0f0f0f0f0f0f, h0f0f0f0f
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movq $0x0101010101010101, h01010101
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leaq (up,n,8), up
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HAM(` leaq (vp,n,8), vp ')
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negq n
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xorl %eax, %eax
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btq $0, n
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jnc L(oop)
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movq (up,n,8), %r8
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HAM(` xorq (vp,n,8), %r8 ')
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movq %r8, %r9
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shrq %r8
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andq h55555555, %r8
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subq %r8, %r9
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movq %r9, %r8
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shrq $2, %r9
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andq h33333333, %r8
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andq h33333333, %r9
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addq %r8, %r9 C 16 4-bit fields (0..4)
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movq %r9, %r8
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shrq $4, %r9
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andq h0f0f0f0f, %r8
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andq h0f0f0f0f, %r9
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addq %r8, %r9 C 8 8-bit fields (0..16)
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imulq h01010101, %r9 C sum the 8 fields in high 8 bits
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shrq $56, %r9
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addq %r9, %rax C add to total
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addq $1, n
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jz L(done)
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ALIGN(16)
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L(oop): movq (up,n,8), %r8
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movq 8(up,n,8), %r12
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HAM(` xorq (vp,n,8), %r8 ')
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HAM(` xorq 8(vp,n,8), %r12 ')
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movq %r8, %r9
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movq %r12, %r13
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shrq %r8
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shrq %r12
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andq h55555555, %r8
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andq h55555555, %r12
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subq %r8, %r9
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subq %r12, %r13
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movq %r9, %r8
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movq %r13, %r12
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shrq $2, %r9
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shrq $2, %r13
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andq h33333333, %r8
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andq h33333333, %r9
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andq h33333333, %r12
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andq h33333333, %r13
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addq %r8, %r9 C 16 4-bit fields (0..4)
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addq %r12, %r13 C 16 4-bit fields (0..4)
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addq %r13, %r9 C 16 4-bit fields (0..8)
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movq %r9, %r8
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shrq $4, %r9
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andq h0f0f0f0f, %r8
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andq h0f0f0f0f, %r9
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addq %r8, %r9 C 8 8-bit fields (0..16)
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imulq h01010101, %r9 C sum the 8 fields in high 8 bits
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shrq $56, %r9
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addq %r9, %rax C add to total
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addq $2, n
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jnc L(oop)
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L(done):
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HAM(` popq %r14 ')
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popq %r13
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popq %r12
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ret
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EPILOGUE()
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