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Annotation of 43BSDTahoe/lib/libc/gen/gen.tahoe/bcopy.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 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:  * This code is derived from software contributed to Berkeley by
        !            18:  * Computer Consoles Inc.
        !            19:  */
        !            20: 
        !            21: #if defined(LIBC_SCCS) && !defined(lint)
        !            22:        .asciz "@(#)bcopy.s     1.3 (Berkeley) 6/27/88"
        !            23: #endif /* LIBC_SCCS and not lint */
        !            24: 
        !            25: /* bcopy(from, to, size) */
        !            26: #include "DEFS.h"
        !            27: 
        !            28: ENTRY(bcopy, 0)
        !            29:        movl    4(fp),r0
        !            30:        movl    8(fp),r1
        !            31:        movl    12(fp),r2
        !            32:        cmpl    r0,r1
        !            33:        bgtru   1f              # normal forward case
        !            34:        beql    2f              # equal, nothing to do
        !            35:        addl2   r2,r0           # may be overlapping
        !            36:        cmpl    r0,r1
        !            37:        bgtru   3f
        !            38:        subl2   r2,r0           # normal forward case
        !            39: 1:
        !            40:        movblk
        !            41: 2:
        !            42:        ret
        !            43: 3:
        !            44:        addl2   r2,r1           # overlapping, must do backwards
        !            45:        subl3   r0,r1,r3
        !            46:        movl    r2,r4
        !            47:        jbr     5f
        !            48: 4:
        !            49:        subl2   r3,r0
        !            50:        subl2   r3,r1
        !            51:        movl    r3,r2
        !            52:        movblk
        !            53:        subl2   r3,r0
        !            54:        subl2   r3,r1
        !            55:        subl2   r3,r4
        !            56: 5:
        !            57:        cmpl    r4,r3
        !            58:        jgtr    4b
        !            59:        movl    r4,r2
        !            60:        subl2   r2,r0
        !            61:        subl2   r2,r1
        !            62:        movblk
        !            63:        ret

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