/*      $NetBSD: strncmp.S,v 1.2 2013/08/19 00:57:25 matt Exp $ */

/*
* Copyright (c) 2002 ARM Ltd
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. The name of the company may not be used to endorse or promote
*    products derived from this software without specific prior written
*    permission.
*
* THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <machine/asm.h>

RCSID("$NetBSD: strncmp.S,v 1.2 2013/08/19 00:57:25 matt Exp $")

ENTRY(strncmp)
/* if ((len - 1) < 0) return 0 */
       subs    r2, r2, #1
#ifdef __thumb__
       bmi     5f
#else
       movmi   r0, #0
       RETc(mi)
#endif

/* ip == last src address to compare */
#ifdef __thumb__
       adds    r3, r0, r2
       mov     ip, r3
       subs    r1, r1, r0
#else
       add     ip, r0, r2
#endif
1:
#ifdef __thumb__
       ldrb    r2, [r0]
       ldrb    r3, [r1, r0]
       adds    r0, r0, #1
       cmp     ip, r0          /* exhausted length? */
       bcc     4f              /*   yes, we're done */
       cmp     r2, #1          /* NUL? */
       bcc     4f              /*   yes, we're done */
       cmp     r2, r3          /* different? */
#else
       ldrb    r2, [r0], #1
       ldrb    r3, [r1], #1
       cmp     ip, r0
       cmpcs   r2, #1
       cmpcs   r2, r3
#endif
       beq     1b
4:      subs    r0, r2, r3
       RET
#ifdef __thumb__
5:      movs    r0, #0
       RET
#endif
END(strncmp)

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