1209231Sjchandra/* $NetBSD: strcmp.S,v 1.2 2009/12/14 00:39:00 matt Exp $ */ 2178580Simp 3178580Simp/*- 4178580Simp * Copyright (c) 1991, 1993 5178580Simp * The Regents of the University of California. All rights reserved. 6178580Simp * 7178580Simp * This code is derived from software contributed to Berkeley by 8178580Simp * Ralph Campbell. 9178580Simp * 10178580Simp * Redistribution and use in source and binary forms, with or without 11178580Simp * modification, are permitted provided that the following conditions 12178580Simp * are met: 13178580Simp * 1. Redistributions of source code must retain the above copyright 14178580Simp * notice, this list of conditions and the following disclaimer. 15178580Simp * 2. Redistributions in binary form must reproduce the above copyright 16178580Simp * notice, this list of conditions and the following disclaimer in the 17178580Simp * documentation and/or other materials provided with the distribution. 18178580Simp * 3. Neither the name of the University nor the names of its contributors 19178580Simp * may be used to endorse or promote products derived from this software 20178580Simp * without specific prior written permission. 21178580Simp * 22178580Simp * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23178580Simp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24178580Simp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25178580Simp * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26178580Simp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27178580Simp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28178580Simp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29178580Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30178580Simp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31178580Simp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32178580Simp * SUCH DAMAGE. 33178580Simp */ 34178580Simp 35178580Simp#include <machine/asm.h> 36178580Simp__FBSDID("$FreeBSD$"); 37178580Simp 38178580Simp#if defined(LIBC_SCCS) && !defined(lint) 39178580Simp ASMSTR("from: @(#)strcmp.s 8.1 (Berkeley) 6/4/93") 40209231Sjchandra ASMSTR("$NetBSD: strcmp.S,v 1.2 2009/12/14 00:39:00 matt Exp $") 41178580Simp#endif /* LIBC_SCCS and not lint */ 42178580Simp 43178580Simp#ifdef __ABICALLS__ 44178580Simp .abicalls 45178580Simp#endif 46178580Simp 47178580Simp/* 48178580Simp * NOTE: this version assumes unsigned chars in order to be "8 bit clean". 49178580Simp */ 50178580SimpLEAF(strcmp) 51178580Simp1: 52178580Simp lbu t0, 0(a0) # get two bytes and compare them 53178580Simp lbu t1, 0(a1) 54178580Simp beq t0, zero, LessOrEq # end of first string? 55178580Simp bne t0, t1, NotEq 56178580Simp lbu t0, 1(a0) # unroll loop 57178580Simp lbu t1, 1(a1) 58209231Sjchandra PTR_ADD a0, a0, 2 59178580Simp beq t0, zero, LessOrEq # end of first string? 60209231Sjchandra PTR_ADD a1, a1, 2 61178580Simp beq t0, t1, 1b 62178580SimpNotEq: 63178580Simp subu v0, t0, t1 64178580Simp j ra 65178580SimpLessOrEq: 66178580Simp subu v0, zero, t1 67178580Simp j ra 68178580SimpEND(strcmp) 69