mpir/mpn/x86_64w/nehalem/hamdist.asm

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; PROLOGUE(mpn_hamdist)
2012-11-25 17:13:44 -05:00
; AMD64 mpn_hamdist
; Copyright 2009 Jason Moxham
; This file is part of the MPIR Library.
; The MPIR Library is free software; you can redistribute it and/or modify
; it under the terms of the GNU Lesser General Public License as published
; by the Free Software Foundation; either verdxon 2.1 of the License, or (at
; your option) any later verdxon.
; The MPIR Library is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
; License for more details.
; You should have received a copy of the GNU Lesser General Public License
; along with the MPIR Library; see the file COPYING.LIB. If not, write
; to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
; Boston, MA 02110-1301, USA.
; mp_limb_t mpn_hamdist(mp_ptr, mp_ptr, mp_size_t)
; rax rdi, rsi, rdx
; rax rcx, rdx, r8
%include 'yasm_mac.inc'
CPU nehalem
BITS 64
LEAF_PROC mpn_hamdist
lea rdx, [rdx+r8*8-8]
lea r9, [rcx+r8*8-8]
mov rcx, 1
xor eax, eax
sub rcx, r8
jnc .1
xalign 16
.0: mov r10, [r9+rcx*8]
xor r10, [rdx+rcx*8]
popcnt r10, r10
mov r11, [r9+rcx*8+8]
xor r11, [rdx+rcx*8+8]
popcnt r11, r11
add rax, r10
add rax, r11
add rcx, 2
jnc .0
.1: jne .2
mov r10, [r9+rcx*8]
xor r10, [rdx+rcx*8]
popcnt r10, r10
add rax, r10
.2: ret
end