diff options
Diffstat (limited to 'sysdeps/x86_64/strcmp.S')
| -rw-r--r-- | sysdeps/x86_64/strcmp.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/sysdeps/x86_64/strcmp.S b/sysdeps/x86_64/strcmp.S new file mode 100644 index 0000000000..6e6bdcbabd --- /dev/null +++ b/sysdeps/x86_64/strcmp.S @@ -0,0 +1,44 @@ +/* Highly optimized version for x86-64. + Copyright (C) 1999, 2000, 2002 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 <sysdep.h> +#include "asm-syntax.h" +#include "bp-sym.h" +#include "bp-asm.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) + + xorq %rax, %rax + ret + +L(neq): movl $1, %eax + movl $-1, %ecx + cmovbl %ecx, %eax + ret +END (BP_SYM (strcmp)) |