11.4Smatt/* $NetBSD: bcmp.S,v 1.4 2011/01/25 02:38:15 matt 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 351.4Smatt#ifdef LIBC_SCCS 361.4SmattRCSID("$NetBSD: bcmp.S,v 1.4 2011/01/25 02:38:15 matt Exp $") 371.4Smatt#endif 381.4Smatt 391.1Sragge/* Since "cmpc3" is not portable across VAXen, do it the hard way */ 401.1Sragge/* still, this is four times faster than the generic C version on a uvax2 */ 411.1Sragge 421.1SraggeENTRY(bcmp, 0) 431.2Smatt movl 12(%ap),%r0 # %r0 = n 441.1Sragge jeql 9f 451.2Smatt movq 4(%ap),%r1 # %r1 = s1, %r2 = s2 461.2Smatt ashl $-2,%r0,%r3 # convert len to # of long words 471.1Sragge jeql 2f 481.1Sragge1: 491.2Smatt cmpl (%r1)+,(%r2)+ # no "cmpq" alas, so four bytes at a time 501.1Sragge jneq 9f 511.2Smatt sobgtr %r3,1b 521.1Sragge2: 531.2Smatt bicl3 $-4,%r0,%r3 # handle at most 3 extra bytes 541.1Sragge jeql 8f 551.1Sragge3: 561.2Smatt cmpb (%r1)+,(%r2)+ 571.1Sragge jneq 9f 581.2Smatt sobgtr %r3,3b 591.1Sragge8: 601.2Smatt clrl %r0 # we have a match! 611.1Sragge9: 621.1Sragge ret 631.4SmattEND(bcmp) 64