2013-08-04 18:17:37 -04:00
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; PROLOGUE(mpn_hamdist)
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2012-11-25 17:13:44 -05:00
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;
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; Copyright 2008 Jason Moxham
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;
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; Windows Conversion Copyright 2008 Brian Gladman
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;
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; This file is part of the MPIR Library.
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; The MPIR Library is free software; you can redistribute it and/or modify
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; it under the terms of the GNU Lesser General Public License as published
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; by the Free Software Foundation; either version 2.1 of the License, or (at
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; your option) any later version.
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; The MPIR Library is distributed in the hope that it will be useful, but
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; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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; License for more details.
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; You should have received a copy of the GNU Lesser General Public License
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; along with the MPIR Library; see the file COPYING.LIB. If not, write
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; to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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; Boston, MA 02110-1301, USA.
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; mp_limb_t mpn_hamdist(mp_ptr, mp_ptr, mp_size_t)
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; rax rdi, rdx, rdx
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; rax rcx, rdx, r8
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%include "yasm_mac.inc"
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CPU SSE4.2
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BITS 64
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FRAME_PROC mpn_hamdist, 0, rdi
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xor eax, eax
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lea rdi, [rcx+r8*8-24]
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lea rdx, [rdx+r8*8-24]
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mov rcx, 3
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sub rcx, r8
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jnc .1
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xalign 16
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.0: mov r8, [rdi+rcx*8]
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mov r9, [rdi+rcx*8+8]
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xor r8, [rdx+rcx*8]
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mov r10, [rdi+rcx*8+16]
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popcnt r8, r8
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xor r9, [rdx+rcx*8+8]
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xor r10, [rdx+rcx*8+16]
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popcnt r9, r9
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mov r11, [rdi+rcx*8+24]
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add rax, r8
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popcnt r10, r10
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xor r11, [rdx+rcx*8+24]
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add rax, r9
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popcnt r11, r11
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add rax, r10
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add rax, r11
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add rcx, 4
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jnc .0
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.1:
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cmp rcx, 2
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ja .5
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je .4
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jp .3
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.2: mov r8, [rdi]
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xor r8, [rdx]
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popcnt r8, r8
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add rax, r8
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.3: mov r8, [rdi+8]
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xor r8, [rdx+8]
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popcnt r8, r8
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add rax, r8
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.4: mov r8, [rdi+16]
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xor r8, [rdx+16]
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popcnt r8, r8
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add rax, r8
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.5: END_PROC rdi
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end
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