1/* 2 * Copyright (c) 1993 Winning Strategies, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Winning Strategies, Inc. 16 * 4. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 33#if defined(LIBC_RCS) && !defined(lint) 34 .text 35 .asciz "$FreeBSD$" 36#endif /* LIBC_RCS and not lint */ 37 38#include "DEFS.h" 39 40/* 41 * memcmp (void *b1, void *b2, size_t len) 42 * 43 * Written by: 44 * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. 45 */ 46 47ENTRY(memcmp) 48 pushl %edi 49 pushl %esi 50 movl 12(%esp),%edi 51 movl 16(%esp),%esi 52 cld /* set compare direction forward */ 53 54 movl 20(%esp),%ecx /* compare by words */ 55 shrl $2,%ecx 56 repe 57 cmpsl 58 jne L5 /* do we match so far? */ 59 60 movl 20(%esp),%ecx /* compare remainder by bytes */ 61 andl $3,%ecx 62 repe 63 cmpsb 64 jne L6 /* do we match? */ 65 66 xorl %eax,%eax /* we match, return zero */ 67 popl %esi 68 popl %edi 69 ret 70 71L5: movl $4,%ecx /* We know that one of the next */ 72 subl %ecx,%edi /* four pairs of bytes do not */ 73 subl %ecx,%esi /* match. */ 74 repe 75 cmpsb 76L6: movzbl -1(%edi),%eax /* Perform unsigned comparison */ 77 movzbl -1(%esi),%edx 78 subl %edx,%eax 79 popl %esi 80 popl %edi 81 ret 82