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Annotation of sys/lib/libkern/arch/mips64/strcmp.S, Revision 1.1.1.1

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)