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

1.1       root        1: /*
                      2:  * Copyright (c) 1983 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 "@(#)bcopy.s     5.6 (Berkeley) 6/1/90"
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: /* bcopy(from, to, size) */
                     25: 
                     26: #include "DEFS.h"
                     27: 
                     28: ENTRY(bcopy, R6)
                     29:        movl    4(ap),r1
                     30:        movl    8(ap),r3
                     31:        movl    12(ap),r6
                     32:        cmpl    r1,r3
                     33:        bgtr    2f              # normal forward case
                     34:        blss    3f              # overlapping, must do backwards
                     35:        ret                     # equal, nothing to do
                     36: 1:
                     37:        subl2   r0,r6
                     38:        movc3   r0,(r1),(r3)
                     39: 2:
                     40:        movzwl  $65535,r0
                     41:        cmpl    r6,r0
                     42:        jgtr    1b
                     43:        movc3   r6,(r1),(r3)
                     44:        ret
                     45: 3:
                     46:        addl2   r6,r1
                     47:        addl2   r6,r3
                     48:        movzwl  $65535,r0
                     49:        jbr     5f
                     50: 4:
                     51:        subl2   r0,r6
                     52:        subl2   r0,r1
                     53:        subl2   r0,r3
                     54:        movc3   r0,(r1),(r3)
                     55:        movzwl  $65535,r0
                     56:        subl2   r0,r1
                     57:        subl2   r0,r3
                     58: 5:
                     59:        cmpl    r6,r0
                     60:        jgtr    4b
                     61:        subl2   r6,r1
                     62:        subl2   r6,r3
                     63:        movc3   r6,(r1),(r3)
                     64:        ret

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