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Annotation of 43BSDReno/lib/libc/tahoe/string/memcmp.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  *
        !            19:  * This code is derived from software contributed to Berkeley by
        !            20:  * Computer Consoles Inc.
        !            21:  */
        !            22: 
        !            23: #if defined(LIBC_SCCS) && !defined(lint)
        !            24:        .asciz "@(#)memcmp.s    5.2 (Berkeley) 6/1/90"
        !            25: #endif /* LIBC_SCCS and not lint */
        !            26: 
        !            27: /*
        !            28:  * int
        !            29:  * memcmp(s1, s2, n)
        !            30:  *     void const *s1, const *s2;
        !            31:  *     size_t n;
        !            32:  *
        !            33:  * Compare up to n bytes from s1/s2.
        !            34:  * Return
        !            35:  *     = 0 if s1 == s2
        !            36:  *     < 0 if s1 < s2          (unsigned character comparison)
        !            37:  *     > 0 if s1 > s2
        !            38:  */
        !            39: #include "DEFS.h"
        !            40: 
        !            41: ENTRY(memcmp, 0)
        !            42:        movl    4(fp),r0
        !            43:        movl    8(fp),r1
        !            44:        mnegl   12(fp),r2
        !            45:        jeql    2f
        !            46: 1:
        !            47:        cmpb    (r0),(r1)
        !            48:        jneq    3f
        !            49:        incl    r0
        !            50:        incl    r1
        !            51:        aoblss  $0,r2,1b
        !            52: 2:
        !            53:        clrl    r0
        !            54:        ret
        !            55: 3:
        !            56:        jlssu   4f
        !            57:        movl    $1,r0
        !            58:        ret
        !            59: 4:
        !            60:        mnegl   $1,r0
        !            61:        ret

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