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Annotation of 43BSDTahoe/lib/libc/gen/gen.vax/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 the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #if defined(LIBC_SCCS) && !defined(lint)
                     19:        .asciz "@(#)bcopy.s     5.5 (Berkeley) 6/27/88"
                     20: #endif /* LIBC_SCCS and not lint */
                     21: 
                     22: /* bcopy(from, to, size) */
                     23: 
                     24: #include "DEFS.h"
                     25: 
                     26: ENTRY(bcopy, R6)
                     27:        movl    4(ap),r1
                     28:        movl    8(ap),r3
                     29:        movl    12(ap),r6
                     30:        cmpl    r1,r3
                     31:        bgtr    2f              # normal forward case
                     32:        blss    3f              # overlapping, must do backwards
                     33:        ret                     # equal, nothing to do
                     34: 1:
                     35:        subl2   r0,r6
                     36:        movc3   r0,(r1),(r3)
                     37: 2:
                     38:        movzwl  $65535,r0
                     39:        cmpl    r6,r0
                     40:        jgtr    1b
                     41:        movc3   r6,(r1),(r3)
                     42:        ret
                     43: 3:
                     44:        addl2   r6,r1
                     45:        addl2   r6,r3
                     46:        movzwl  $65535,r0
                     47:        jbr     5f
                     48: 4:
                     49:        subl2   r0,r6
                     50:        subl2   r0,r1
                     51:        subl2   r0,r3
                     52:        movc3   r0,(r1),(r3)
                     53:        movzwl  $65535,r0
                     54:        subl2   r0,r1
                     55:        subl2   r0,r3
                     56: 5:
                     57:        cmpl    r6,r0
                     58:        jgtr    4b
                     59:        subl2   r6,r1
                     60:        subl2   r6,r3
                     61:        movc3   r6,(r1),(r3)
                     62:        ret

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