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42 lines
2.4 KiB
ArmAsm
42 lines
2.4 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 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/pcmpstr.inc"
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#include "libc/nexgen32e/strstr.inc"
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// TODO(jart): Fix me.
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strstr_sse42:
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.leafprologue
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mov %rdi,%rax
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xor %ecx,%ecx
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0: mov $-16,%rdx
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1: add $16,%rdx
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movaps (%rsi,%rdx),%xmm0
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2: add %rcx,%rax
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lea (%rax,%rdx),%rdi
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pcmpistri $.Lequalordered,(%rdi),%xmm0
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3: ja 2b # !CF (no match) && !ZF (need NUL-term)
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jnc 4f # !CF (no match) && ZF (NUL-terminator)
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jno 0b # !OF ← CF && CX!=0 (matched at offset)
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jns 1b # !SF ← NUL ∉ XMM1 (need to match more)
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jmp 5f # youtu.be/nVk1DjMtLWs
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4: xor %eax,%eax
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5: .leafepilogue
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.endfn strstr_sse42,globl,hidden
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.source __FILE__
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