1*b6cbf720SGianluca Guida/* $NetBSD: strcmp.S,v 1.2 2009/12/14 00:39:00 matt Exp $ */ 2*b6cbf720SGianluca Guida 3*b6cbf720SGianluca Guida/*- 4*b6cbf720SGianluca Guida * Copyright (c) 1991, 1993 5*b6cbf720SGianluca Guida * The Regents of the University of California. All rights reserved. 6*b6cbf720SGianluca Guida * 7*b6cbf720SGianluca Guida * This code is derived from software contributed to Berkeley by 8*b6cbf720SGianluca Guida * Ralph Campbell. 9*b6cbf720SGianluca Guida * 10*b6cbf720SGianluca Guida * Redistribution and use in source and binary forms, with or without 11*b6cbf720SGianluca Guida * modification, are permitted provided that the following conditions 12*b6cbf720SGianluca Guida * are met: 13*b6cbf720SGianluca Guida * 1. Redistributions of source code must retain the above copyright 14*b6cbf720SGianluca Guida * notice, this list of conditions and the following disclaimer. 15*b6cbf720SGianluca Guida * 2. Redistributions in binary form must reproduce the above copyright 16*b6cbf720SGianluca Guida * notice, this list of conditions and the following disclaimer in the 17*b6cbf720SGianluca Guida * documentation and/or other materials provided with the distribution. 18*b6cbf720SGianluca Guida * 3. Neither the name of the University nor the names of its contributors 19*b6cbf720SGianluca Guida * may be used to endorse or promote products derived from this software 20*b6cbf720SGianluca Guida * without specific prior written permission. 21*b6cbf720SGianluca Guida * 22*b6cbf720SGianluca Guida * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23*b6cbf720SGianluca Guida * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24*b6cbf720SGianluca Guida * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25*b6cbf720SGianluca Guida * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26*b6cbf720SGianluca Guida * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27*b6cbf720SGianluca Guida * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28*b6cbf720SGianluca Guida * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29*b6cbf720SGianluca Guida * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30*b6cbf720SGianluca Guida * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31*b6cbf720SGianluca Guida * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32*b6cbf720SGianluca Guida * SUCH DAMAGE. 33*b6cbf720SGianluca Guida */ 34*b6cbf720SGianluca Guida 35*b6cbf720SGianluca Guida#include <mips/asm.h> 36*b6cbf720SGianluca Guida 37*b6cbf720SGianluca Guida#if defined(LIBC_SCCS) && !defined(lint) 38*b6cbf720SGianluca Guida /* RCSID("from: @(#)strcmp.s 8.1 (Berkeley) 6/4/93") */ 39*b6cbf720SGianluca Guida RCSID("$NetBSD: strcmp.S,v 1.2 2009/12/14 00:39:00 matt Exp $") 40*b6cbf720SGianluca Guida#endif /* LIBC_SCCS and not lint */ 41*b6cbf720SGianluca Guida 42*b6cbf720SGianluca Guida/* 43*b6cbf720SGianluca Guida * NOTE: this version assumes unsigned chars in order to be "8 bit clean". 44*b6cbf720SGianluca Guida */ 45*b6cbf720SGianluca GuidaLEAF(strcmp) 46*b6cbf720SGianluca Guida1: 47*b6cbf720SGianluca Guida lbu t0, 0(a0) # get two bytes and compare them 48*b6cbf720SGianluca Guida lbu t1, 0(a1) 49*b6cbf720SGianluca Guida beq t0, zero, LessOrEq # end of first string? 50*b6cbf720SGianluca Guida bne t0, t1, NotEq 51*b6cbf720SGianluca Guida lbu t0, 1(a0) # unroll loop 52*b6cbf720SGianluca Guida lbu t1, 1(a1) 53*b6cbf720SGianluca Guida PTR_ADD a0, a0, 2 54*b6cbf720SGianluca Guida beq t0, zero, LessOrEq # end of first string? 55*b6cbf720SGianluca Guida PTR_ADD a1, a1, 2 56*b6cbf720SGianluca Guida beq t0, t1, 1b 57*b6cbf720SGianluca GuidaNotEq: 58*b6cbf720SGianluca Guida subu v0, t0, t1 59*b6cbf720SGianluca Guida j ra 60*b6cbf720SGianluca GuidaLessOrEq: 61*b6cbf720SGianluca Guida subu v0, zero, t1 62*b6cbf720SGianluca Guida j ra 63*b6cbf720SGianluca GuidaEND(strcmp) 64