1/* $NetBSD: strncmp.S,v 1.1 2005/12/20 19:28:49 christos Exp $ */ 2 3/*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Hiroshi Horimoto <horimoto@cs-aoi.cs.sist.ac.jp> and 9 * by J.T. Conklin <jtc@NetBSD.org>. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40#include <machine/asm.h> 41 42#if defined(LIBC_SCCS) && !defined(lint) 43 RCSID("$NetBSD: strncmp.S,v 1.1 2005/12/20 19:28:49 christos Exp $") 44#endif /* LIBC_SCCS and not lint */ 45 46ENTRY(strncmp) 47 movl %sp@(12),%d0 48 jeq L4 49 movl %sp@(4),%a0 50 movl %sp@(8),%a1 51L1: /* unroll by 4 for m680[23]0's */ 52 movb %a0@+,%d1 53 jeq L2 54 subb %a1@+,%d1 55 jne L3 56 subql #1,%d0 57 jeq L4 58 59 movb %a0@+,%d1 60 jeq L2 61 subb %a1@+,%d1 62 jne L3 63 subql #1,%d0 64 jeq L4 65 66 movb %a0@+,%d1 67 jeq L2 68 subb %a1@+,%d1 69 jne L3 70 subql #1,%d0 71 jeq L4 72 73 movb %a0@+,%d1 74 jeq L2 75 subb %a1@+,%d1 76 jne L3 77 subql #1,%d0 78 jne L1 79L4: rts 80 81L2: subb %a1@,%d1 82L3: scs %d0 83 EXTBL(%d0) 84 movb %d1,%d0 85 rts 86