diff options
Diffstat (limited to 'libc/string/x86_64/strcmp.S')
| -rw-r--r-- | libc/string/x86_64/strcmp.S | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/libc/string/x86_64/strcmp.S b/libc/string/x86_64/strcmp.S new file mode 100644 index 000000000..0b401a773 --- /dev/null +++ b/libc/string/x86_64/strcmp.S @@ -0,0 +1,41 @@ +/* Highly optimized version for x86-64. + Copyright (C) 1999, 2000, 2002, 2003, 2005 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Based on i686 version contributed by Ulrich Drepper + <drepper@cygnus.com>, 1999. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include "_glibc_inc.h" + + .text +ENTRY (BP_SYM (strcmp)) +L(oop): movb (%rdi), %al + cmpb (%rsi), %al + jne L(neq) + incq %rdi + incq %rsi + testb %al, %al + jnz L(oop) + + xorl %eax, %eax + ret + +L(neq): movl $1, %eax + movl $-1, %ecx + cmovbl %ecx, %eax + ret +END (BP_SYM (strcmp)) |