Home | History | Annotate | Line # | Download | only in string
strcmp.S revision 1.1.18.1 
      1 /*      $NetBSD: strcmp.S,v 1.1.18.1 2007/08/28 17:35:31 matt Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2002 ARM Ltd
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the company may not be used to endorse or promote
     16  *    products derived from this software without specific prior written
     17  *    permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
     20  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     22  * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
     24  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     25  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     26  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     27  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <machine/asm.h>
     32 
     33 RCSID("$NetBSD: strcmp.S,v 1.1.18.1 2007/08/28 17:35:31 matt Exp $")
     34 
     35 ENTRY(strcmp)
     36 #ifdef __thumb__
     37 	push	{r4}
     38 	mov	r4, #0
     39 1:
     40 	ldrb	r2, [r0, r4]
     41 	ldrb	r3, [r1, r4]
     42 	cmp	r2, #0
     43 	beq	2f
     44 	cmp	r2, r3
     45 	beq	2f
     46 	add	r4, r4, #1
     47 	b	1b
     48 2:	sub	r0, r2, r3
     49 	pop	{r4}
     50 	RET
     51 #else
     52 1:
     53 	ldrb    r2, [r0], #1
     54 	ldrb    r3, [r1], #1
     55 	cmp     r2, #1
     56 	cmpcs   r2, r3
     57 	beq     1b
     58 	sub     r0, r2, r3
     59 	RET
     60 #endif
     61 	END(strcmp)
     62