bcmp.S revision 1.4
1 1.1 cgd /* 2 1.1 cgd * Copyright (c) 1993 Winning Strategies, Inc. 3 1.1 cgd * All rights reserved. 4 1.1 cgd * 5 1.1 cgd * Redistribution and use in source and binary forms, with or without 6 1.1 cgd * modification, are permitted provided that the following conditions 7 1.1 cgd * are met: 8 1.1 cgd * 1. Redistributions of source code must retain the above copyright 9 1.1 cgd * notice, this list of conditions and the following disclaimer. 10 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 11 1.1 cgd * notice, this list of conditions and the following disclaimer in the 12 1.1 cgd * documentation and/or other materials provided with the distribution. 13 1.1 cgd * 3. All advertising materials mentioning features or use of this software 14 1.1 cgd * must display the following acknowledgement: 15 1.1 cgd * This product includes software developed by Winning Strategies, Inc. 16 1.1 cgd * 4. The name of the author may not be used to endorse or promote products 17 1.3 jtc * derived from this software without specific prior written permission 18 1.1 cgd * 19 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 1.1 cgd * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 1.1 cgd * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 1.1 cgd * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 1.1 cgd * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 1.1 cgd * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 1.1 cgd * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 1.1 cgd * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 1.1 cgd * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 1.1 cgd * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 1.1 cgd * 30 1.4 jtc * $Id: bcmp.S,v 1.4 1994/03/12 01:39:55 jtc Exp $ 31 1.1 cgd */ 32 1.1 cgd 33 1.4 jtc #include <machine/asm.h> 34 1.4 jtc 35 1.2 jtc #if defined(LIBC_SCCS) 36 1.4 jtc RCSID("$Id: bcmp.S,v 1.4 1994/03/12 01:39:55 jtc Exp $") 37 1.2 jtc #endif 38 1.1 cgd 39 1.1 cgd /* 40 1.1 cgd * bcmp (void *b1, void *b2, size_t len) 41 1.1 cgd * 42 1.1 cgd * Written by: 43 1.1 cgd * J.T. Conklin (jtc (at) wimsey.com), Winning Strategies, Inc. 44 1.1 cgd */ 45 1.1 cgd 46 1.1 cgd ENTRY(bcmp) 47 1.1 cgd pushl %edi 48 1.1 cgd pushl %esi 49 1.1 cgd movl 12(%esp),%edi 50 1.1 cgd movl 16(%esp),%esi 51 1.1 cgd movl 20(%esp),%edx 52 1.1 cgd xorl %eax,%eax /* clear return value */ 53 1.1 cgd cld /* set compare direction forward */ 54 1.1 cgd 55 1.1 cgd movl %edx,%ecx /* compare by words */ 56 1.1 cgd shrl $2,%ecx 57 1.1 cgd repe 58 1.1 cgd cmpsl 59 1.1 cgd jne L1 60 1.1 cgd 61 1.1 cgd movl %edx,%ecx /* compare remainder by bytes */ 62 1.1 cgd andl $3,%ecx 63 1.1 cgd repe 64 1.1 cgd cmpsb 65 1.1 cgd je L2 66 1.1 cgd 67 1.1 cgd L1: incl %eax 68 1.1 cgd L2: popl %esi 69 1.1 cgd popl %edi 70 1.1 cgd ret 71
Indexes created Mon Sep 22 21:09:42 GMT 2025