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

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The 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: 
        !            20: #if defined(LIBC_SCCS) && !defined(lint)
        !            21:        .asciz "@(#)memcmp.s    5.1 (Berkeley) 5/15/90"
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: /* int memcmp(s1, s2, n) */
        !            25: 
        !            26: #include "DEFS.h"
        !            27: 
        !            28: ENTRY(memcmp, 0)
        !            29:        movl    4(ap),r1        /* r1 = s1 */
        !            30:        movq    8(ap),r3        /* r3 = s2; r4 = n */
        !            31:        movzwl  $65535,r5
        !            32: 0:
        !            33:        cmpl    r4,r5
        !            34:        jgtru   3f              /* handle stupid cmpc3 limitation */
        !            35:        cmpc3   r4,(r1),(r3)    /* compare */
        !            36:        beql    2f              /* done if same (r0 = 0) */
        !            37: 1:
        !            38:        movzbl  (r1),r0
        !            39:        movzbl  (r3),r2
        !            40:        subl2   r2,r0           /* return *s1 - *s2; s1,s2 unsigned chars */
        !            41: 2:
        !            42:        ret
        !            43: 3:
        !            44:        subl2   r5,r4           /* do 64K; adjust count */
        !            45:        cmpc3   r5,(r1),(r3)
        !            46:        jeql    0b              /* loop if same */
        !            47:        jbr     1b

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