mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 17:11:06 +00:00
dbda6079a6
2000-06-30 Ulrich Drepper <drepper@redhat.com> * sysdeps/i386/i686/strcmp.S: Little optimization in non-BP case.
71 lines
2.0 KiB
ArmAsm
71 lines
2.0 KiB
ArmAsm
/* Highly optimized version for ix86, x>=6.
|
|
Copyright (C) 1999, 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. 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"
|
|
|
|
#define PARMS LINKAGE /* no space for saved regs */
|
|
#define STR1 PARMS
|
|
#define STR2 STR1+PTR_SIZE
|
|
|
|
.text
|
|
ENTRY (BP_SYM (strcmp))
|
|
ENTER
|
|
|
|
movl STR1(%esp), %ecx
|
|
movl STR2(%esp), %edx
|
|
CHECK_BOUNDS_LOW (%ecx, STR1(%esp))
|
|
CHECK_BOUNDS_LOW (%edx, STR2(%esp))
|
|
|
|
L(oop): movb (%ecx), %al
|
|
cmpb (%edx), %al
|
|
jne L(neq)
|
|
incl %ecx
|
|
incl %edx
|
|
testb %al, %al
|
|
jnz L(oop)
|
|
|
|
xorl %eax, %eax
|
|
/* when strings are equal, pointers rest one beyond
|
|
the end of the NUL terminators. */
|
|
CHECK_BOUNDS_HIGH (%ecx, STR1(%esp), jbe)
|
|
CHECK_BOUNDS_HIGH (%edx, STR2(%esp), jbe)
|
|
jmp L(out)
|
|
|
|
#ifndef __BOUNDED_POINTERS__
|
|
L(neq): movl $1, %eax
|
|
movl $-1, %ecx
|
|
cmovbl %ecx, %eax
|
|
#else
|
|
L(neq): movl $1, %eax
|
|
ja L(chk)
|
|
negl %eax
|
|
/* When strings differ, pointers rest on
|
|
the unequal characters. */
|
|
L(chk): CHECK_BOUNDS_HIGH (%ecx, STR1(%esp), jb)
|
|
CHECK_BOUNDS_HIGH (%edx, STR2(%esp), jb)
|
|
#endif
|
|
|
|
L(out): LEAVE
|
|
ret
|
|
END (BP_SYM (strcmp))
|