1*787e823fSmatt/* $NetBSD: memcmp.S,v 1.4 2011/01/25 02:38:15 matt Exp $ */ 292a955a8Sragge/*- 392a955a8Sragge * Copyright (c) 1990, 1993 492a955a8Sragge * The Regents of the University of California. All rights reserved. 592a955a8Sragge * 692a955a8Sragge * Redistribution and use in source and binary forms, with or without 792a955a8Sragge * modification, are permitted provided that the following conditions 892a955a8Sragge * are met: 992a955a8Sragge * 1. Redistributions of source code must retain the above copyright 1092a955a8Sragge * notice, this list of conditions and the following disclaimer. 1192a955a8Sragge * 2. Redistributions in binary form must reproduce the above copyright 1292a955a8Sragge * notice, this list of conditions and the following disclaimer in the 1392a955a8Sragge * documentation and/or other materials provided with the distribution. 14eb7c1594Sagc * 3. Neither the name of the University nor the names of its contributors 1592a955a8Sragge * may be used to endorse or promote products derived from this software 1692a955a8Sragge * without specific prior written permission. 1792a955a8Sragge * 1892a955a8Sragge * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1992a955a8Sragge * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2092a955a8Sragge * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2192a955a8Sragge * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2292a955a8Sragge * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2392a955a8Sragge * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2492a955a8Sragge * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2592a955a8Sragge * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2692a955a8Sragge * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2792a955a8Sragge * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2892a955a8Sragge * SUCH DAMAGE. 2992a955a8Sragge */ 3092a955a8Sragge 3192a955a8Sragge/* int memcmp(s1, s2, n) */ 3292a955a8Sragge 3392a955a8Sragge#include "DEFS.h" 3492a955a8Sragge 35*787e823fSmatt#ifdef LIBC_SCCS 36*787e823fSmattRCSID("$NetBSD: memcmp.S,v 1.4 2011/01/25 02:38:15 matt Exp $") 37*787e823fSmatt#endif 38*787e823fSmatt 3992a955a8SraggeENTRY(memcmp, 0) 400ce5ca14Smatt movl 12(%ap),%r0 4192a955a8Sragge jeql 9f 420ce5ca14Smatt movq 4(%ap),%r1 430ce5ca14Smatt ashl $-2,%r0,%r3 # convert len to long words 4492a955a8Sragge jeql 2f 4592a955a8Sragge1: 460ce5ca14Smatt cmpl (%r1)+,(%r2)+ # no "cmpq" alas 4792a955a8Sragge jneq 7f 480ce5ca14Smatt sobgtr %r3,1b 4992a955a8Sragge2: 500ce5ca14Smatt bicl3 $-4,%r0,%r3 # handle at most 3 extra bytes 5192a955a8Sragge jeql 4f 5292a955a8Sragge3: 530ce5ca14Smatt cmpb (%r1)+,(%r2)+ 5492a955a8Sragge jneq 8f 550ce5ca14Smatt sobgtr %r3,3b 5692a955a8Sragge4: 570ce5ca14Smatt clrl %r0 # we had a match 5892a955a8Sragge ret 5992a955a8Sragge7: # backup, and do a byte compare 600ce5ca14Smatt tstl -(%r1) 610ce5ca14Smatt tstl -(%r2) 620ce5ca14Smatt movl $4,%r3 6392a955a8Sragge jbr 3b 6492a955a8Sragge8: 650ce5ca14Smatt movzbl -(%r1),%r3 660ce5ca14Smatt movzbl -(%r2),%r4 670ce5ca14Smatt subl3 %r4,%r3,%r0 6892a955a8Sragge9: 6992a955a8Sragge ret 70*787e823fSmattEND(memcmp) 71