/* $NetBSD: strncmp.S,v 1.1 2002/12/08 09:48:38 scw Exp $ */ /* * Copyright 2002 Wasabi Systems, Inc. * All rights reserved. * * Written by Steve C. Woodford for Wasabi Systems, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project by * Wasabi Systems, Inc. * 4. The name of Wasabi Systems, Inc. may not be used to endorse * or promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include /* * int strncmp(const char *s1, const char *s2, size_t len) * * Note: * We assume that this routine is mostly called for short strings, and that * the overhead of aligning s1/s2 to permit long or quad comparisons is * just Not Worth The Effort. */ ENTRY(strncmp) #ifndef _LP64 add.l r2, r63, r5 add.l r3, r63, r3 addz.l r4, r63, r4 #else add r2, r63, r5 #endif pta/l 1f, tr1 ptabs/u r18, tr0 movi 0, r2 beq/u r4, r63, tr0 /* Bail out now if len == 0 */ movi 0, r6 1: ldx.ub r5, r6, r0 /* r0 = *s1 */ ldx.ub r3, r6, r1 /* r1 = *s2 */ addi r6, 1, r6 /* s1++, s2++ */ sub r0, r1, r2 /* r2 = r0 - r1 */ beq/u r4, r6, tr0 /* Return now if compared "len" bytes */ bne/u r0, r1, tr0 /* Return if no match */ bne/l r0, r63, tr1 /* Loop until *s1 == '\0' */ blink tr0, r63