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Annotation of sys/lib/libkern/arch/mips64/strcmp.S, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: strcmp.S,v 1.4 2004/10/08 14:42:09 pefo Exp $ */
        !             2: /*-
        !             3:  * Copyright (c) 1991, 1993
        !             4:  *      The Regents of the University of California.  All rights reserved.
        !             5:  *
        !             6:  * This code is derived from software contributed to Berkeley by
        !             7:  * Ralph Campbell.
        !             8:  *
        !             9:  * Redistribution and use in source and binary forms, with or without
        !            10:  * modification, are permitted provided that the following conditions
        !            11:  * are met:
        !            12:  * 1. Redistributions of source code must retain the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer.
        !            14:  * 2. Redistributions in binary form must reproduce the above copyright
        !            15:  *    notice, this list of conditions and the following disclaimer in the
        !            16:  *    documentation and/or other materials provided with the distribution.
        !            17:  * 3. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  */
        !            33:
        !            34: #include "DEFS.h"
        !            35:
        !            36:
        !            37: /*
        !            38:  * NOTE: this version assumes unsigned chars in order to be "8 bit clean".
        !            39:  */
        !            40: LEAF(strcmp, 0)
        !            41:        .set    noreorder
        !            42: 1:
        !            43:        lbu     t0, 0(a0)               # get two bytes and compare them
        !            44:        lbu     t1, 0(a1)
        !            45:        beq     t0, zero, LessOrEq      # end of first string?
        !            46:        nop
        !            47:        bne     t0, t1, NotEq
        !            48:        nop
        !            49:        lbu     t0, 1(a0)               # unroll loop
        !            50:        lbu     t1, 1(a1)
        !            51:        beq     t0, zero, LessOrEq      # end of first string?
        !            52:        PTR_ADDU a0, a0, 2
        !            53:        beq     t0, t1, 1b
        !            54:        PTR_ADDU a1, a1, 2
        !            55: NotEq:
        !            56:        j       ra
        !            57:        PTR_SUBU v0, t0, t1
        !            58: LessOrEq:
        !            59:        j       ra
        !            60:        PTR_SUBU v0, zero, t1
        !            61: END(strcmp)