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https://github.com/jart/cosmopolitan.git
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73 lines
2.7 KiB
ArmAsm
73 lines
2.7 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.h"
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/ Returns prefix length, consisting of chars not in reject.
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/ a.k.a. Return index of first byte that's in charset.
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/
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/ @param rdi is string
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/ @param rsi is reject nul-terminated character set
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/ @see strspn(), strtok_r()
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/ @asyncsignalsafe
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strcspn:
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push %rbp
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mov %rsp,%rbp
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sub $16,%rsp
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push %rdi
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mov %rsi,%rdi
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call strlen
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pop %rdi
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cmp $15,%rax
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ja 4f
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push %rdi
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mov %rax,%rdx
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pxor %xmm0,%xmm0
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lea -16(%rbp),%rdi
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movdqa %xmm0,(%rdi)
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call MemCpy
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movdqa (%rdi),%xmm1
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pop %rdi
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or $-1,%rax
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0: inc %rax
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movzbl (%rdi,%rax),%ecx
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movd %ecx,%xmm0
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punpcklbw %xmm0,%xmm0
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punpcklwd %xmm0,%xmm0
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pshufd $0,%xmm0,%xmm0
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pcmpeqb %xmm1,%xmm0
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pmovmskb %xmm0,%ecx
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test %ecx,%ecx
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jz 0b
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9: leave
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ret
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1: cmp %ch,%cl
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je 9b
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inc %edx
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2: mov (%rsi,%rdx),%ch
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test %ch,%ch
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jne 1b
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inc %rax
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3: mov (%rdi,%rax),%cl
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test %cl,%cl
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je 9b
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xor %edx,%edx
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jmp 2b
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4: xor %eax,%eax
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jmp 3b
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.endfn strcspn,globl
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