1992-05-13 10:52:32 +08:00
|
|
|
/*-
|
|
|
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
|
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
|
|
|
* must display the following acknowledgement:
|
|
|
|
|
* This product includes software developed by the University of
|
|
|
|
|
* California, Berkeley and its contributors.
|
|
|
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
|
|
|
* may be used to endorse or promote products derived from this software
|
|
|
|
|
* without specific prior written permission.
|
|
|
|
|
*
|
|
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
|
|
|
.asciz "@(#)memcmp.s 5.1 (Berkeley) 5/15/90"
|
|
|
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
|
|
|
|
|
|
/* int memcmp(s1, s2, n) */
|
|
|
|
|
|
|
|
|
|
#include "DEFS.h"
|
|
|
|
|
|
|
|
|
|
ENTRY(memcmp, 0)
|
|
|
|
|
movl 4(ap),r1 /* r1 = s1 */
|
|
|
|
|
movq 8(ap),r3 /* r3 = s2; r4 = n */
|
|
|
|
|
movzwl $65535,r5
|
|
|
|
|
0:
|
|
|
|
|
cmpl r4,r5
|
|
|
|
|
jgtru 3f /* handle stupid cmpc3 limitation */
|
|
|
|
|
cmpc3 r4,(r1),(r3) /* compare */
|
|
|
|
|
beql 2f /* done if same (r0 = 0) */
|
|
|
|
|
1:
|
|
|
|
|
movzbl (r1),r0
|
|
|
|
|
movzbl (r3),r2
|
|
|
|
|
subl2 r2,r0 /* return *s1 - *s2; s1,s2 unsigned chars */
|
|
|
|
|
2:
|
|
|
|
|
ret
|
|
|
|
|
3:
|
|
|
|
|
subl2 r5,r4 /* do 64K; adjust count */
|
|
|
|
|
cmpc3 r5,(r1),(r3)
|
|
|
|
|
jeql 0b /* loop if same */
|
|
|
|
|
jbr 1b
|
1996-09-10 09:59:36 +08:00
|
|
|
|
|
|
|
|
weak_alias (memcmp, bcmp)
|
