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Annotation of 43BSD/lib/libc/vax/gen/bcopy.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifdef LIBC_SCCS
        !             8:        .asciz  "@(#)bcopy.s    5.3 (Berkeley) 3/9/86"
        !             9: #endif LIBC_SCCS
        !            10: 
        !            11: /* bcopy(from, to, size) */
        !            12: 
        !            13: #include "DEFS.h"
        !            14: 
        !            15: ENTRY(bcopy, R6)
        !            16:        movl    4(ap),r1
        !            17:        movl    8(ap),r3
        !            18:        movl    12(ap),r6
        !            19:        cmpl    r1,r3
        !            20:        bgtr    2f              # normal forward case
        !            21:        blss    3f              # overlapping, must do backwards
        !            22:        ret                     # equal, nothing to do
        !            23: 1:
        !            24:        subl2   r0,r6
        !            25:        movc3   r0,(r1),(r3)
        !            26: 2:
        !            27:        movzwl  $65535,r0
        !            28:        cmpl    r6,r0
        !            29:        jgtr    1b
        !            30:        movc3   r6,(r1),(r3)
        !            31:        ret
        !            32: 3:
        !            33:        addl2   r6,r1
        !            34:        addl2   r6,r3
        !            35:        movzwl  $65535,r0
        !            36:        jbr     5f
        !            37: 4:
        !            38:        subl2   r0,r6
        !            39:        subl2   r0,r1
        !            40:        subl2   r0,r3
        !            41:        movc3   r0,(r1),(r3)
        !            42:        movzwl  $65535,r0
        !            43:        subl2   r0,r1
        !            44:        subl2   r0,r3
        !            45: 5:
        !            46:        cmpl    r6,r0
        !            47:        jgtr    4b
        !            48:        subl2   r6,r1
        !            49:        subl2   r6,r3
        !            50:        movc3   r6,(r1),(r3)
        !            51:        ret

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