bcmp.S revision 1.3
11.3Sagc/* $NetBSD: bcmp.S,v 1.3 2003/08/07 16:42:32 agc Exp $ */ 21.1Sragge/* 31.1Sragge * Copyright (c) 1983, 1993 41.1Sragge * The Regents of the University of California. All rights reserved. 51.1Sragge * 61.1Sragge * Redistribution and use in source and binary forms, with or without 71.1Sragge * modification, are permitted provided that the following conditions 81.1Sragge * are met: 91.1Sragge * 1. Redistributions of source code must retain the above copyright 101.1Sragge * notice, this list of conditions and the following disclaimer. 111.1Sragge * 2. Redistributions in binary form must reproduce the above copyright 121.1Sragge * notice, this list of conditions and the following disclaimer in the 131.1Sragge * documentation and/or other materials provided with the distribution. 141.3Sagc * 3. Neither the name of the University nor the names of its contributors 151.1Sragge * may be used to endorse or promote products derived from this software 161.1Sragge * without specific prior written permission. 171.1Sragge * 181.1Sragge * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 191.1Sragge * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 201.1Sragge * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 211.1Sragge * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 221.1Sragge * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 231.1Sragge * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 241.1Sragge * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 251.1Sragge * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 261.1Sragge * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 271.1Sragge * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 281.1Sragge * SUCH DAMAGE. 291.1Sragge */ 301.1Sragge 311.1Sragge/* bcmp(s1, s2, n) */ 321.1Sragge 331.1Sragge#include "DEFS.h" 341.1Sragge 351.1Sragge/* Since "cmpc3" is not portable across VAXen, do it the hard way */ 361.1Sragge/* still, this is four times faster than the generic C version on a uvax2 */ 371.1Sragge 381.1SraggeENTRY(bcmp, 0) 391.2Smatt movl 12(%ap),%r0 # %r0 = n 401.1Sragge jeql 9f 411.2Smatt movq 4(%ap),%r1 # %r1 = s1, %r2 = s2 421.2Smatt ashl $-2,%r0,%r3 # convert len to # of long words 431.1Sragge jeql 2f 441.1Sragge1: 451.2Smatt cmpl (%r1)+,(%r2)+ # no "cmpq" alas, so four bytes at a time 461.1Sragge jneq 9f 471.2Smatt sobgtr %r3,1b 481.1Sragge2: 491.2Smatt bicl3 $-4,%r0,%r3 # handle at most 3 extra bytes 501.1Sragge jeql 8f 511.1Sragge3: 521.2Smatt cmpb (%r1)+,(%r2)+ 531.1Sragge jneq 9f 541.2Smatt sobgtr %r3,3b 551.1Sragge8: 561.2Smatt clrl %r0 # we have a match! 571.1Sragge9: 581.1Sragge ret 59