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      1 /*      $NetBSD: strcmp.S,v 1.2 2013/08/19 00:56:12 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 1.2 2013/08/19 00:56:12 matt Exp $")
     34 
     35 ENTRY(strcmp)
     36 #if !defined(__thumb__)
     37 1:	ldrb	r2, [r0], #1
     38 	ldrb	r3, [r1], #1
     39 	cmp	r2, #1
     40 	cmpcs	r2, r3
     41 #else
     42 	subs	r1, r1, r0	/* this allows us to only one increment */
     43 1:	ldrb	r2, [r0]
     44 	ldrb	r3, [r1, r0]
     45 	adds	r0, r0, #1	/* increment */
     46 	cmp	r2, #1
     47 	bcc	2f
     48 	cmp	r2, r3
     49 #endif
     50 	beq	1b
     51 2:	subs	r0, r2, r3
     52 	RET
     53 END(strcmp)
     54