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 1797748Sschweikh * derived from this software without 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 */ 301849Swollman 3185437Speter#include <machine/asm.h> 3293000Sobrien__FBSDID("$FreeBSD$"); 331849Swollman 341849Swollman/* 351849Swollman * strcmp(s1, s2) 361849Swollman * return an integer greater than, equal to, or less than 0, 371849Swollman * according as string s1 is greater than, equal to, or less 381849Swollman * than the string s2. 391849Swollman * 401849Swollman * %eax - pointer to s1 411849Swollman * %edx - pointer to s2 421849Swollman * 431849Swollman * Written by: 441849Swollman * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. 451849Swollman */ 461849Swollman 471849Swollman/* 481849Swollman * I've unrolled the loop eight times: large enough to make a 491849Swollman * significant difference, and small enough not to totally trash the 5091999Sbillf * cache. 511849Swollman */ 521849Swollman 531849SwollmanENTRY(strcmp) 541849Swollman movl 0x04(%esp),%eax 551849Swollman movl 0x08(%esp),%edx 561849Swollman jmp L2 /* Jump into the loop! */ 571849Swollman 581849Swollman .align 2,0x90 591849SwollmanL1: incl %eax 601849Swollman incl %edx 611849SwollmanL2: movb (%eax),%cl 621849Swollman testb %cl,%cl 631849Swollman je L3 641849Swollman cmpb %cl,(%edx) 651849Swollman jne L3 661849Swollman incl %eax 671849Swollman incl %edx 681849Swollman movb (%eax),%cl 691849Swollman testb %cl,%cl 701849Swollman je L3 711849Swollman cmpb %cl,(%edx) 721849Swollman jne L3 731849Swollman incl %eax 741849Swollman incl %edx 751849Swollman movb (%eax),%cl 761849Swollman testb %cl,%cl 771849Swollman je L3 781849Swollman cmpb %cl,(%edx) 791849Swollman jne L3 801849Swollman incl %eax 811849Swollman incl %edx 821849Swollman movb (%eax),%cl 831849Swollman testb %cl,%cl 841849Swollman je L3 851849Swollman cmpb %cl,(%edx) 861849Swollman jne L3 871849Swollman incl %eax 881849Swollman incl %edx 891849Swollman movb (%eax),%cl 901849Swollman testb %cl,%cl 911849Swollman je L3 921849Swollman cmpb %cl,(%edx) 931849Swollman jne L3 941849Swollman incl %eax 951849Swollman incl %edx 961849Swollman movb (%eax),%cl 971849Swollman testb %cl,%cl 981849Swollman je L3 991849Swollman cmpb %cl,(%edx) 1001849Swollman jne L3 1011849Swollman incl %eax 1021849Swollman incl %edx 1031849Swollman movb (%eax),%cl 1041849Swollman testb %cl,%cl 1051849Swollman je L3 1061849Swollman cmpb %cl,(%edx) 1071849Swollman jne L3 1081849Swollman incl %eax 1091849Swollman incl %edx 1101849Swollman movb (%eax),%cl 1111849Swollman testb %cl,%cl 1121849Swollman je L3 1131849Swollman cmpb %cl,(%edx) 1141849Swollman je L1 1151849Swollman .align 2, 0x90 1161849SwollmanL3: movzbl (%eax),%eax /* unsigned comparison */ 1171849Swollman movzbl (%edx),%edx 1181849Swollman subl %edx,%eax 1191849Swollman ret 120184548SpeterEND(strcmp) 121217106Skib 122217106Skib .section .note.GNU-stack,"",%progbits 123