1/* $NetBSD: strncmp.S,v 1.2 2008/04/28 20:22:52 martin 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#include <machine/asm.h> 34 35#if defined(LIBC_SCCS) && !defined(lint) 36 RCSID("$NetBSD: strncmp.S,v 1.2 2008/04/28 20:22:52 martin Exp $") 37#endif /* LIBC_SCCS and not lint */ 38 39ENTRY(strncmp) 40 movl %sp@(12),%d0 41 jeq L4 42 movl %sp@(4),%a0 43 movl %sp@(8),%a1 44L1: /* unroll by 4 for m680[23]0's */ 45 movb %a0@+,%d1 46 jeq L2 47 subb %a1@+,%d1 48 jne L3 49 subql #1,%d0 50 jeq L4 51 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 jne L1 72L4: rts 73 74L2: subb %a1@,%d1 75L3: scs %d0 76 EXTBL(%d0) 77 movb %d1,%d0 78 rts 79