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Annotation of 43BSDReno/lib/libc/hp300/string/strcmp.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:  * This code is derived from software contributed to Berkeley by
                      6:  * the Systems Programming Group of the University of Utah Computer
                      7:  * Science Department.
                      8:  *
                      9:  * Redistribution and use in source and binary forms are permitted
                     10:  * provided that: (1) source distributions retain this entire copyright
                     11:  * notice and comment, and (2) distributions including binaries display
                     12:  * the following acknowledgement:  ``This product includes software
                     13:  * developed by the University of California, Berkeley and its contributors''
                     14:  * in the documentation or other materials provided with the distribution
                     15:  * and in all advertising materials mentioning features or use of this
                     16:  * software. Neither the name of the University nor the names of its
                     17:  * contributors may be used to endorse or promote products derived
                     18:  * from this software without specific prior written permission.
                     19:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     20:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     21:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     22:  */
                     23: 
                     24: #if defined(LIBC_SCCS) && !defined(lint)
                     25:        .asciz "@(#)strcmp.s    5.1 (Berkeley) 5/12/90"
                     26: #endif /* LIBC_SCCS and not lint */
                     27: 
                     28: #include "DEFS.h"
                     29: 
                     30: /*
                     31:  * NOTE: this guy returns result compatible with the VAX assembly version.
                     32:  * The C version on the portable gen directory returns different results
                     33:  * (different signs!) when comparing chars with the high bit on.  Who is
                     34:  * right??
                     35:  */
                     36: ENTRY(strcmp)
                     37:        movl    sp@(4),a0       /* a0 = string1 */
                     38:        movl    sp@(8),a1       /* a1 = string2 */
                     39: scloop:
                     40:        movb    a0@+,d0         /* get *string1 */
                     41:        cmpb    a1@+,d0         /* compare a byte */
                     42:        jne     scexit          /* not equal, break out */
                     43:        tstb    d0              /* at end of string1? */
                     44:        jne     scloop          /* no, keep going */
                     45:        moveq   #0,d0           /* strings are equal */
                     46:        rts
                     47: scexit:
                     48:        subb    a1@-,d0         /* *string1 - *string2 */
                     49:        extbl   d0
                     50:        rts

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