70 lines
1.7 KiB
NASM
70 lines
1.7 KiB
NASM
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dnl mpn_hamdist
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dnl Copyright 2010 The Code Cavern
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dnl This file is part of the MPIR Library.
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dnl The MPIR Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The MPIR 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 Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the MPIR Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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ASM_START()
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PROLOGUE(mpn_hamdist)
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xor %eax,%eax
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lea -24(%rdi,%rdx,8),%rdi
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lea -24(%rsi,%rdx,8),%rsi
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mov $3,%rcx
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sub %rdx,%rcx
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jnc skiplp
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ALIGN(16)
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lp: mov (%rdi,%rcx,8),%r8
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mov 8(%rdi,%rcx,8),%r9
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xor (%rsi,%rcx,8),%r8
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mov 16(%rdi,%rcx,8),%r10
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popcnt %r8,%r8
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xor 8(%rsi,%rcx,8),%r9
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xor 16(%rsi,%rcx,8),%r10
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popcnt %r9,%r9
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mov 24(%rdi,%rcx,8),%r11
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add %r8,%rax
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popcnt %r10,%r10
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xor 24(%rsi,%rcx,8),%r11
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add %r9,%rax
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popcnt %r11,%r11
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add %r10,%rax
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add %r11,%rax
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add $4,%rcx
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jnc lp
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skiplp:
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cmp $2,%rcx
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ja case0
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je case1
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jp case2
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case3: mov (%rdi),%r8
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xor (%rsi),%r8
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popcnt %r8,%r8
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add %r8,%rax
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case2: mov 8(%rdi),%r8
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xor 8(%rsi),%r8
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popcnt %r8,%r8
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add %r8,%rax
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case1: mov 16(%rdi),%r8
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xor 16(%rsi),%r8
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popcnt %r8,%r8
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add %r8,%rax
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case0: ret
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EPILOGUE()
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