2020-06-15 14:18:57 +00:00
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/*-*- mode:asm; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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/ Creates bit mask of which bytes are the same.
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/
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/ @param %rdi points to bit mask (write-only)
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/ @param %rsi points to first buffer (read-only)
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/ @param %rdx points to second buffer (read-only)
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/ @param %rcx is byte length of both %rsi and %rdx
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/ @return %rax is set to %rdi
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/ @note buffers should be 128-byte aligned
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memeqmask:
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.leafprologue
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xor %eax,%eax
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test %ecx,%ecx
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jz 1f
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shr $3,%ecx
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0: movdqa (%rsi,%rax,8),%xmm0
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movdqa 16(%rsi,%rax,8),%xmm1
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pcmpeqb (%rdx,%rax,8),%xmm0
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pcmpeqb 16(%rdx,%rax,8),%xmm1
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vpmovmskb %xmm0,%r8d
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vpmovmskb %xmm1,%r9d
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mov %r8w,(%rdi,%rax)
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mov %r9w,2(%rdi,%rax)
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add $4,%eax
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cmp %ecx,%eax
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jb 0b
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1: mov %rdi,%rax
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.leafepilogue
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.endfn memeqmask,globl
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2020-06-16 02:01:28 +00:00
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.source __FILE__
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