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Annotation of 43BSDTahoe/lib/libc/gen/gen.vax/bcopy.s, revision 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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