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

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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