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dnl AMD64 mpn_hamdist -- hamming distance.
dnl Copyright 2008, 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 cycles/limb
C AMD K8,K9 -
C AMD K10 2.0 =
C AMD bd1 ~4.4 =
C AMD bd2 ~4.4 =
C AMD bd3
C AMD bd4
C AMD bobcat 7.55 =
C AMD jaguar 2.52 -
C Intel P4 -
C Intel core2 -
C Intel NHM 2.03 +
C Intel SBR 2.01 +
C Intel IBR 1.96 +
C Intel HWL 1.64 =
C Intel BWL 1.56 -
C Intel SKL 1.52 =
C Intel atom
C Intel SLM 3.0 -
C VIA nano
define(`ap', `%rdi')
define(`bp', `%rsi')
define(`n', `%rdx')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
ASM_START()
TEXT
ALIGN(32)
PROLOGUE(mpn_hamdist)
FUNC_ENTRY(3)
mov (ap), %r8
xor (bp), %r8
lea (ap,n,8), ap C point at A operand end
lea (bp,n,8), bp C point at B operand end
neg n
test $1, R8(n)
jz L(2)
L(1): .byte 0xf3,0x49,0x0f,0xb8,0xc0 C popcnt %r8, %rax
xor R32(%r10), R32(%r10)
inc n
js L(top)
FUNC_EXIT()
ret
ALIGN(16)
L(2): mov 8(ap,n,8), %r9
.byte 0xf3,0x49,0x0f,0xb8,0xc0 C popcnt %r8, %rax
xor 8(bp,n,8), %r9
.byte 0xf3,0x4d,0x0f,0xb8,0xd1 C popcnt %r9, %r10
add $2, n
js L(top)
lea (%r10, %rax), %rax
FUNC_EXIT()
ret
ALIGN(16)
L(top): mov (ap,n,8), %r8
lea (%r10, %rax), %rax
mov 8(ap,n,8), %r9
xor (bp,n,8), %r8
xor 8(bp,n,8), %r9
.byte 0xf3,0x49,0x0f,0xb8,0xc8 C popcnt %r8, %rcx
lea (%rcx, %rax), %rax
.byte 0xf3,0x4d,0x0f,0xb8,0xd1 C popcnt %r9, %r10
add $2, n
js L(top)
lea (%r10, %rax), %rax
FUNC_EXIT()
ret
EPILOGUE()
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