71 lines
2.0 KiB
ArmAsm
71 lines
2.0 KiB
ArmAsm
/* Highly optimized version for ix86, x>=6.
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Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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#include "asm-syntax.h"
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#include "bp-sym.h"
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#include "bp-asm.h"
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#define PARMS LINKAGE /* no space for saved regs */
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#define STR1 PARMS
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#define STR2 STR1+PTR_SIZE
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.text
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ENTRY (BP_SYM (strcmp))
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ENTER
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movl STR1(%esp), %ecx
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movl STR2(%esp), %edx
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CHECK_BOUNDS_LOW (%ecx, STR1(%esp))
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CHECK_BOUNDS_LOW (%edx, STR2(%esp))
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L(oop): movb (%ecx), %al
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cmpb (%edx), %al
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jne L(neq)
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incl %ecx
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incl %edx
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testb %al, %al
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jnz L(oop)
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xorl %eax, %eax
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/* when strings are equal, pointers rest one beyond
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the end of the NUL terminators. */
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CHECK_BOUNDS_HIGH (%ecx, STR1(%esp), jbe)
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CHECK_BOUNDS_HIGH (%edx, STR2(%esp), jbe)
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jmp L(out)
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#ifndef __BOUNDED_POINTERS__
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L(neq): movl $1, %eax
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movl $-1, %ecx
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cmovbl %ecx, %eax
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#else
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L(neq): movl $1, %eax
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ja L(chk)
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negl %eax
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/* When strings differ, pointers rest on
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the unequal characters. */
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L(chk): CHECK_BOUNDS_HIGH (%ecx, STR1(%esp), jb)
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CHECK_BOUNDS_HIGH (%edx, STR2(%esp), jb)
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#endif
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L(out): LEAVE
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ret
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END (BP_SYM (strcmp))
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