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Annotation of 43BSDReno/lib/libc/vax/string/memcmp.s, revision 1.1.1.1

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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