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- /*-
- * 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
-