51 lines
2.5 KiB
ArmAsm
51 lines
2.5 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 sw=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/nexgen32e/x86feature.h"
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#include "libc/dce.h"
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#include "libc/macros.h"
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/ Dispatches to fastest memcmp() implementation.
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/
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/ @param edi first string
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/ @param esi second string
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/ @param edx byte size
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/ @return unsigned char subtraction at stop index
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/ @asyncsignalsafe
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.initbss 300,_init_memcmp
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__memcmp:
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.quad 0
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.endobj __memcmp,globl,hidden
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.previous
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.init.start 300,_init_memcmp
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#if !IsTiny()
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ezlea memcmp$avx2,ax
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#if !X86_NEED(AVX2)
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ezlea memcmp$sse2,dx
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testb X86_HAVE(AVX2)+kCpuids(%rip)
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cmovz %rdx,%rax
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#endif /* AVX */
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#else
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ezlea memcmp$sse2,ax
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#endif /* TINY */
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stosq
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.init.end 300,_init_memcmp
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.source __FILE__
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