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Justine Tunney
2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/nexgen32e/tinystrcmp.S Normal file
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/*-*- mode:asm; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.h"
/ Compares NUL-terminated strings w/o heavy-lifting.
/
/ @param rdi is first non-null NUL-terminated string pointer
/ @param rsi is second non-null NUL-terminated string pointer
/ @return rax is <0, 0, or >0 based on uint8_t comparison
/ @clob flags only
/ @asyncsignalsafe
tinystrcmp:
.leafprologue
push %rcx
push %rdx
xor %ecx,%ecx
0: movzbl (%rdi,%rcx,1),%eax
movzbl (%rsi,%rcx,1),%edx
test %al,%al
jz 1f
cmp %dl,%al
jne 1f
inc %rcx
jmp 0b
1: sub %edx,%eax
pop %rdx
pop %rcx
.leafepilogue
.endfn tinystrcmp,globl
.yoink __FILE__