/*      $NetBSD: strncmp.S,v 1.7 2013/09/07 19:06:29 chs Exp $  */

/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Hiroshi Horimoto <[email protected]> and
* by J.T. Conklin <[email protected]>.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 THE FOUNDATION OR CONTRIBUTORS
* 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>

#if defined(LIBC_SCCS) && !defined(lint)
       RCSID("$NetBSD: strncmp.S,v 1.7 2013/09/07 19:06:29 chs Exp $")
#endif /* LIBC_SCCS and not lint */


#ifdef __mcoldfire__
#define GETC(a,b)       mvsb    a,b
#define SUBC(a,b)       mvsb    a,%d2; subl %d2,b
#else
#define GETC(a,b)       movb    a,b
#define SUBC(a,b)       subb    a,b
#endif

ENTRY(strncmp)
       movl    12(%sp),%d0
       jeq     .L4
       movl    4(%sp),%a0
       movl    8(%sp),%a1
#ifdef __coldfire__
       movl    %d2,-(%sp)      | save temp
#endif
L1:                             /* unroll by 4 for m680[23]0's */
       GETC((%a0)+,%d1)
       jeq     .L2
       SUBC((%a1)+,%d1)
       jne     .L3
       subql   #1,%d0
       jeq     .L4

       GETC((%a0)+,%d1)
       jeq     .L2
       SUBC((%a1)+,%d1)
       jne     .L3
       subql   #1,%d0
       jeq     .L4

       GETC((%a0)+,%d1)
       jeq     .L2
       SUBC((%a1)+,%d1)
       jne     .L3
       subql   #1,%d0
       jeq     .L4

       GETC((%a0)+,%d1)
       jeq     .L2
       SUBC((%a1)+,%d1)
       jne     .L3
       subql   #1,%d0
       jne     .L1
#ifdef __mcoldfire__
       movl    (%sp)+,%d2              | restore temp
#endif
L4:     rts

L2:     SUBC((%a1),%d1)
L3:
#ifdef __mcoldfire__
       movl    (%sp)+,%d2              | restore temp
       movl    %d1,%d0
#else
       scs     %d0
       EXTBL(%d0)
       moveb   %d1,%d0
#endif
       rts
END(strncmp)

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