1*8daf714eSmatt/* $NetBSD: strcmp.S,v 1.2 2009/12/14 00:39:00 matt Exp $ */ 237c9f0a6Schristos 337c9f0a6Schristos/*- 437c9f0a6Schristos * Copyright (c) 1991, 1993 537c9f0a6Schristos * The Regents of the University of California. All rights reserved. 637c9f0a6Schristos * 737c9f0a6Schristos * This code is derived from software contributed to Berkeley by 837c9f0a6Schristos * Ralph Campbell. 937c9f0a6Schristos * 1037c9f0a6Schristos * Redistribution and use in source and binary forms, with or without 1137c9f0a6Schristos * modification, are permitted provided that the following conditions 1237c9f0a6Schristos * are met: 1337c9f0a6Schristos * 1. Redistributions of source code must retain the above copyright 1437c9f0a6Schristos * notice, this list of conditions and the following disclaimer. 1537c9f0a6Schristos * 2. Redistributions in binary form must reproduce the above copyright 1637c9f0a6Schristos * notice, this list of conditions and the following disclaimer in the 1737c9f0a6Schristos * documentation and/or other materials provided with the distribution. 1837c9f0a6Schristos * 3. Neither the name of the University nor the names of its contributors 1937c9f0a6Schristos * may be used to endorse or promote products derived from this software 2037c9f0a6Schristos * without specific prior written permission. 2137c9f0a6Schristos * 2237c9f0a6Schristos * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2337c9f0a6Schristos * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2437c9f0a6Schristos * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2537c9f0a6Schristos * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2637c9f0a6Schristos * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2737c9f0a6Schristos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2837c9f0a6Schristos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2937c9f0a6Schristos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3037c9f0a6Schristos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3137c9f0a6Schristos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3237c9f0a6Schristos * SUCH DAMAGE. 3337c9f0a6Schristos */ 3437c9f0a6Schristos 3537c9f0a6Schristos#include <mips/asm.h> 3637c9f0a6Schristos 3737c9f0a6Schristos#if defined(LIBC_SCCS) && !defined(lint) 38*8daf714eSmatt /* RCSID("from: @(#)strcmp.s 8.1 (Berkeley) 6/4/93") */ 39*8daf714eSmatt RCSID("$NetBSD: strcmp.S,v 1.2 2009/12/14 00:39:00 matt Exp $") 4037c9f0a6Schristos#endif /* LIBC_SCCS and not lint */ 4137c9f0a6Schristos 4237c9f0a6Schristos/* 4337c9f0a6Schristos * NOTE: this version assumes unsigned chars in order to be "8 bit clean". 4437c9f0a6Schristos */ 4537c9f0a6SchristosLEAF(strcmp) 4637c9f0a6Schristos1: 4737c9f0a6Schristos lbu t0, 0(a0) # get two bytes and compare them 4837c9f0a6Schristos lbu t1, 0(a1) 4937c9f0a6Schristos beq t0, zero, LessOrEq # end of first string? 5037c9f0a6Schristos bne t0, t1, NotEq 5137c9f0a6Schristos lbu t0, 1(a0) # unroll loop 5237c9f0a6Schristos lbu t1, 1(a1) 53*8daf714eSmatt PTR_ADD a0, a0, 2 5437c9f0a6Schristos beq t0, zero, LessOrEq # end of first string? 55*8daf714eSmatt PTR_ADD a1, a1, 2 5637c9f0a6Schristos beq t0, t1, 1b 5737c9f0a6SchristosNotEq: 5837c9f0a6Schristos subu v0, t0, t1 5937c9f0a6Schristos j ra 6037c9f0a6SchristosLessOrEq: 6137c9f0a6Schristos subu v0, zero, t1 6237c9f0a6Schristos j ra 6337c9f0a6SchristosEND(strcmp) 64