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dnl AMD64 mpn_popcount, mpn_hamdist -- population count and hamming distance.
dnl Copyright 2004, 2005, 2007, 2010-2012, 2017 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C popcount hamdist
C cycles/limb cycles/limb
C AMD K8,K9 6 7
C AMD K10 6 7
C Intel P4 12 14.3
C Intel core2 7 8
C Intel corei ? 7.3
C Intel atom 16.5 17.5
C VIA nano 8.75 10.4
C TODO
C * Tune. It should be possible to reach 5 c/l for popcount and 6 c/l for
C hamdist for K8/K9.
ifdef(`OPERATION_popcount',`
define(`func',`mpn_popcount')
define(`up', `%rdi')
define(`n', `%rsi')
define(`h55555555', `%r10')
define(`h33333333', `%r11')
define(`h0f0f0f0f', `%rcx')
define(`h01010101', `%rdx')
define(`POP', `$1')
define(`HAM', `dnl')
')
ifdef(`OPERATION_hamdist',`
define(`func',`mpn_hamdist')
define(`up', `%rdi')
define(`vp', `%rsi')
define(`n', `%rdx')
define(`h55555555', `%r10')
define(`h33333333', `%r11')
define(`h0f0f0f0f', `%rcx')
define(`h01010101', `%r12')
define(`POP', `dnl')
define(`HAM', `$1')
')
MULFUNC_PROLOGUE(mpn_popcount mpn_hamdist)
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
ASM_START()
TEXT
ALIGN(32)
PROLOGUE(func)
POP(` FUNC_ENTRY(2) ')
HAM(` FUNC_ENTRY(3) ')
push %rbx
mov $0x5555555555555555, h55555555
push %rbp
mov $0x3333333333333333, h33333333
HAM(` push %r12 ')
lea (up,n,8), up
mov $0x0f0f0f0f0f0f0f0f, h0f0f0f0f
HAM(` lea (vp,n,8), vp ')
neg n
mov $0x0101010101010101, h01010101
xor R32(%rax), R32(%rax)
test $1, R8(n)
jz L(top)
mov (up,n,8), %r8
HAM(` xor (vp,n,8), %r8 ')
mov %r8, %r9
shr %r8
and h55555555, %r8
sub %r8, %r9
mov %r9, %r8
shr $2, %r9
and h33333333, %r8
and h33333333, %r9
add %r8, %r9 C 16 4-bit fields (0..4)
dec n
jmp L(mid)
ALIGN(16)
L(top): mov (up,n,8), %r8
mov 8(up,n,8), %rbx
HAM(` xor (vp,n,8), %r8 ')
HAM(` xor 8(vp,n,8), %rbx ')
mov %r8, %r9
mov %rbx, %rbp
shr %r8
shr %rbx
and h55555555, %r8
and h55555555, %rbx
sub %r8, %r9
sub %rbx, %rbp
mov %r9, %r8
mov %rbp, %rbx
shr $2, %r9
shr $2, %rbp
and h33333333, %r8
and h33333333, %r9
and h33333333, %rbx
and h33333333, %rbp
add %r8, %r9 C 16 4-bit fields (0..4)
add %rbx, %rbp C 16 4-bit fields (0..4)
add %rbp, %r9 C 16 4-bit fields (0..8)
L(mid): mov %r9, %r8
shr $4, %r9
and h0f0f0f0f, %r8
and h0f0f0f0f, %r9
add %r8, %r9 C 8 8-bit fields (0..16)
imul h01010101, %r9 C sum the 8 fields in high 8 bits
shr $56, %r9
add %r9, %rax C add to total
add $2, n
jnc L(top)
L(end):
HAM(` pop %r12 ')
pop %rbp
pop %rbx
FUNC_EXIT()
ret
EPILOGUE()
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