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4c74403188
Change-Id: Iae65e95cfa0d92091b8b0a424ae36d88efa76aa9 Reviewed-on: https://review.haiku-os.org/c/buildtools/+/3020 Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
164 lines
3.6 KiB
NASM
164 lines
3.6 KiB
NASM
dnl AMD64 mpn_popcount, mpn_hamdist -- population count and hamming distance.
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dnl Copyright 2004, 2005, 2007, 2010-2012, 2017 Free Software Foundation, Inc.
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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 modify
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dnl it under the terms of either:
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dnl
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dnl * the GNU Lesser General Public License as published by the Free
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dnl Software Foundation; either version 3 of the License, or (at your
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dnl option) any later version.
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dnl
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dnl or
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dnl
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dnl * the GNU General Public License as published by the Free Software
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dnl Foundation; either version 2 of the License, or (at your option) any
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dnl later version.
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dnl
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dnl or both in parallel, as here.
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dnl
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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 General Public License
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dnl for more details.
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dnl
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dnl You should have received copies of the GNU General Public License and the
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dnl GNU Lesser General Public License along with the GNU MP Library. If not,
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dnl see https://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 AMD K8,K9 6 7
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C AMD K10 6 7
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C Intel P4 12 14.3
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C Intel core2 7 8
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C Intel corei ? 7.3
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C Intel atom 16.5 17.5
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C VIA nano 8.75 10.4
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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(`POP', `$1')
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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', `%r12')
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define(`POP', `dnl')
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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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ABI_SUPPORT(DOS64)
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ABI_SUPPORT(STD64)
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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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POP(` FUNC_ENTRY(2) ')
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HAM(` FUNC_ENTRY(3) ')
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push %rbx
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mov $0x5555555555555555, h55555555
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push %rbp
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mov $0x3333333333333333, h33333333
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HAM(` push %r12 ')
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lea (up,n,8), up
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mov $0x0f0f0f0f0f0f0f0f, h0f0f0f0f
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HAM(` lea (vp,n,8), vp ')
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neg n
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mov $0x0101010101010101, h01010101
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xor R32(%rax), R32(%rax)
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test $1, R8(n)
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jz L(top)
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mov (up,n,8), %r8
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HAM(` xor (vp,n,8), %r8 ')
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mov %r8, %r9
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shr %r8
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and h55555555, %r8
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sub %r8, %r9
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mov %r9, %r8
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shr $2, %r9
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and h33333333, %r8
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and h33333333, %r9
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add %r8, %r9 C 16 4-bit fields (0..4)
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dec n
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jmp L(mid)
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ALIGN(16)
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L(top): mov (up,n,8), %r8
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mov 8(up,n,8), %rbx
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HAM(` xor (vp,n,8), %r8 ')
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HAM(` xor 8(vp,n,8), %rbx ')
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mov %r8, %r9
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mov %rbx, %rbp
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shr %r8
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shr %rbx
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and h55555555, %r8
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and h55555555, %rbx
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sub %r8, %r9
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sub %rbx, %rbp
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mov %r9, %r8
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mov %rbp, %rbx
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shr $2, %r9
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shr $2, %rbp
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and h33333333, %r8
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and h33333333, %r9
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and h33333333, %rbx
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and h33333333, %rbp
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add %r8, %r9 C 16 4-bit fields (0..4)
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add %rbx, %rbp C 16 4-bit fields (0..4)
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add %rbp, %r9 C 16 4-bit fields (0..8)
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L(mid): mov %r9, %r8
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shr $4, %r9
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and h0f0f0f0f, %r8
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and h0f0f0f0f, %r9
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add %r8, %r9 C 8 8-bit fields (0..16)
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imul h01010101, %r9 C sum the 8 fields in high 8 bits
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shr $56, %r9
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add %r9, %rax C add to total
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add $2, n
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jnc L(top)
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L(end):
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HAM(` pop %r12 ')
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pop %rbp
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pop %rbx
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FUNC_EXIT()
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ret
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EPILOGUE()
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