strcpy.S revision 5790
11849Swollman/* 21849Swollman * Copyright (c) 1993 Winning Strategies, Inc. 31849Swollman * All rights reserved. 41849Swollman * 51849Swollman * Redistribution and use in source and binary forms, with or without 61849Swollman * modification, are permitted provided that the following conditions 71849Swollman * are met: 81849Swollman * 1. Redistributions of source code must retain the above copyright 91849Swollman * notice, this list of conditions and the following disclaimer. 101849Swollman * 2. Redistributions in binary form must reproduce the above copyright 111849Swollman * notice, this list of conditions and the following disclaimer in the 121849Swollman * documentation and/or other materials provided with the distribution. 131849Swollman * 3. All advertising materials mentioning features or use of this software 141849Swollman * must display the following acknowledgement: 151849Swollman * This product includes software developed by Winning Strategies, Inc. 161849Swollman * 4. The name of the author may not be used to endorse or promote products 171849Swollman * derived from this software withough specific prior written permission 181849Swollman * 191849Swollman * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 201849Swollman * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 211849Swollman * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 221849Swollman * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 231849Swollman * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 241849Swollman * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 251849Swollman * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 261849Swollman * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 271849Swollman * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 281849Swollman * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 291849Swollman * 305790Sdg * $Id: strcpy.S,v 1.1 1994/08/05 01:18:34 wollman Exp $ 311849Swollman */ 321849Swollman 331849Swollman#if defined(LIBC_RCS) && !defined(lint) 345790Sdg .text 355790Sdg .asciz "$Id: strcpy.S,v 1.1 1994/08/05 01:18:34 wollman Exp $" 361849Swollman#endif /* LIBC_RCS and not lint */ 371849Swollman 381849Swollman#include "DEFS.h" 391849Swollman 401849Swollman/* 411849Swollman * strcpy (dst, src) 421849Swollman * copy the string src to dst. 431849Swollman * 441849Swollman * Written by: 451849Swollman * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. 461849Swollman */ 471849Swollman 481849Swollman/* 491849Swollman * I've unrolled the loop eight times: large enough to make a 501849Swollman * significant difference, and small enough not to totally trash the 511849Swollman * cashe. 521849Swollman */ 531849Swollman 541849SwollmanENTRY(strcpy) 551849Swollman movl 4(%esp),%ecx /* dst address */ 561849Swollman movl 8(%esp),%edx /* src address */ 571849Swollman pushl %ecx /* push dst address */ 581849Swollman 591849Swollman .align 2,0x90 601849SwollmanL1: movb (%edx),%al /* unroll loop, but not too much */ 611849Swollman movb %al,(%ecx) 621849Swollman testb %al,%al 631849Swollman je L2 641849Swollman movb 1(%edx),%al 651849Swollman movb %al,1(%ecx) 661849Swollman testb %al,%al 671849Swollman je L2 681849Swollman movb 2(%edx),%al 691849Swollman movb %al,2(%ecx) 701849Swollman testb %al,%al 711849Swollman je L2 721849Swollman movb 3(%edx),%al 731849Swollman movb %al,3(%ecx) 741849Swollman testb %al,%al 751849Swollman je L2 761849Swollman movb 4(%edx),%al 771849Swollman movb %al,4(%ecx) 781849Swollman testb %al,%al 791849Swollman je L2 801849Swollman movb 5(%edx),%al 811849Swollman movb %al,5(%ecx) 821849Swollman testb %al,%al 831849Swollman je L2 841849Swollman movb 6(%edx),%al 851849Swollman movb %al,6(%ecx) 861849Swollman testb %al,%al 871849Swollman je L2 881849Swollman movb 7(%edx),%al 891849Swollman movb %al,7(%ecx) 901849Swollman addl $8,%edx 911849Swollman addl $8,%ecx 921849Swollman testb %al,%al 931849Swollman jne L1 941849SwollmanL2: popl %eax /* pop dst address */ 951849Swollman ret 96