1/* $NetBSD: strcmp.S,v 1.7 2013/09/07 19:06:29 chs 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: strcmp.S,v 1.7 2013/09/07 19:06:29 chs Exp $") 37#endif /* LIBC_SCCS and not lint */ 38 39#ifdef __mcoldfire__ 40#define GETC(a,b) mvsb a,b 41#define SUBC(a,b) mvsb a,%d0; subl %d0,b 42#else 43#define GETC(a,b) movb a,b 44#define SUBC(a,b) subb a,b 45#endif 46 47ENTRY(strcmp) 48 movl 4(%sp),%a0 49 movl 8(%sp),%a1 50.L1: /* unrolled by 4 for 680[23]0's */ 51 GETC((%a0)+,%d1) 52 jeq .L2 53 SUBC((%a1)+,%d1) 54 jne .L3 55 56 GETC((%a0)+,%d1) 57 jeq .L2 58 SUBC((%a1)+,%d1) 59 jne .L3 60 61 GETC((%a0)+,%d1) 62 jeq .L2 63 SUBC((%a1)+,%d1) 64 jne .L3 65 66 GETC((%a0)+,%d1) 67 jeq .L2 68 SUBC((%a1)+,%d1) 69 jeq .L1 70 71.L3: 72#ifdef __mcoldfire__ 73 movl %d1,%d0 74#else 75 scs %d0 76 EXTBL(%d0) 77 movb %d1,%d0 78#endif 79 rts 80 81.L2: movq #0,%d0 82 movb (%a1),%d0 83 negl %d0 84 rts 85END(strcmp) 86