1*9b9d2a55Sguenther/* $OpenBSD: strcmp.S,v 1.5 2015/08/31 02:53:56 guenther Exp $ */ 20eea0d08Spefo/*- 30eea0d08Spefo * Copyright (c) 1991, 1993 40eea0d08Spefo * The Regents of the University of California. All rights reserved. 50eea0d08Spefo * 60eea0d08Spefo * This code is derived from software contributed to Berkeley by 70eea0d08Spefo * Ralph Campbell. 80eea0d08Spefo * 90eea0d08Spefo * Redistribution and use in source and binary forms, with or without 100eea0d08Spefo * modification, are permitted provided that the following conditions 110eea0d08Spefo * are met: 120eea0d08Spefo * 1. Redistributions of source code must retain the above copyright 130eea0d08Spefo * notice, this list of conditions and the following disclaimer. 140eea0d08Spefo * 2. Redistributions in binary form must reproduce the above copyright 150eea0d08Spefo * notice, this list of conditions and the following disclaimer in the 160eea0d08Spefo * documentation and/or other materials provided with the distribution. 170eea0d08Spefo * 3. Neither the name of the University nor the names of its contributors 180eea0d08Spefo * may be used to endorse or promote products derived from this software 190eea0d08Spefo * without specific prior written permission. 200eea0d08Spefo * 210eea0d08Spefo * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 220eea0d08Spefo * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 230eea0d08Spefo * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 240eea0d08Spefo * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 250eea0d08Spefo * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 260eea0d08Spefo * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 270eea0d08Spefo * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 280eea0d08Spefo * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 290eea0d08Spefo * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 300eea0d08Spefo * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 310eea0d08Spefo * SUCH DAMAGE. 320eea0d08Spefo */ 330eea0d08Spefo 34*9b9d2a55Sguenther#include "SYS.h" 350eea0d08Spefo 360eea0d08Spefo/* 370eea0d08Spefo * NOTE: this version assumes unsigned chars in order to be "8 bit clean". 380eea0d08Spefo */ 395738bc62SpefoLEAF(strcmp, 0) 400eea0d08Spefo .set reorder 410eea0d08Spefo1: 420eea0d08Spefo lbu t0, 0(a0) # get two bytes and compare them 430eea0d08Spefo lbu t1, 0(a1) 440eea0d08Spefo beq t0, zero, LessOrEq # end of first string? 450eea0d08Spefo bne t0, t1, NotEq 460eea0d08Spefo lbu t0, 1(a0) # unroll loop 470eea0d08Spefo lbu t1, 1(a1) 4850027fe1Smiod dadd a0, a0, 2 490eea0d08Spefo beq t0, zero, LessOrEq # end of first string? 5050027fe1Smiod dadd a1, a1, 2 510eea0d08Spefo beq t0, t1, 1b 520eea0d08SpefoNotEq: 5350027fe1Smiod dsubu v0, t0, t1 540eea0d08Spefo j ra 550eea0d08SpefoLessOrEq: 5650027fe1Smiod dsubu v0, zero, t1 570eea0d08Spefo j ra 58*9b9d2a55SguentherEND_STRONG(strcmp) 59