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Annotation of 43BSDReno/lib/libc/tahoe/string/memmove.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 provided
        !             6:  * that: (1) source distributions retain this entire copyright notice and
        !             7:  * comment, and (2) distributions including binaries display the following
        !             8:  * acknowledgement:  ``This product includes software developed by the
        !             9:  * University of California, Berkeley and its contributors'' in the
        !            10:  * documentation or other materials provided with the distribution and in
        !            11:  * all advertising materials mentioning features or use of this software.
        !            12:  * Neither the name of the University nor the names of its contributors may
        !            13:  * be used to endorse or promote products derived from this software without
        !            14:  * specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  *
        !            19:  * This code is derived from software contributed to Berkeley by
        !            20:  * Computer Consoles Inc.
        !            21:  */
        !            22: 
        !            23: #if defined(LIBC_SCCS) && !defined(lint)
        !            24:        .asciz "@(#)memmove.s   5.2 (Berkeley) 6/1/90"
        !            25: #endif /* LIBC_SCCS and not lint */
        !            26: 
        !            27: /* void *memmove(to, from, size) */
        !            28: #include "DEFS.h"
        !            29: 
        !            30: ENTRY(memmove, 0)
        !            31:        movl    4(fp),r1
        !            32:        movl    8(fp),r0
        !            33:        movl    12(fp),r2
        !            34:        cmpl    r0,r1
        !            35:        bgtru   1f              /* normal forward case */
        !            36:        beql    2f              /* equal, nothing to do */
        !            37:        addl2   r2,r0           /* may be overlapping */
        !            38:        cmpl    r0,r1
        !            39:        bgtru   3f
        !            40:        subl2   r2,r0           /* normal forward case */
        !            41: 1:
        !            42:        movblk
        !            43: 2:
        !            44:        movl    4(fp),r0        /* this can probably be optimised */
        !            45:        ret
        !            46: 3:
        !            47:        addl2   r2,r1           /* overlapping, must do backwards */
        !            48:        subl3   r0,r1,r3
        !            49:        movl    r2,r4
        !            50:        jbr     5f
        !            51: 4:
        !            52:        subl2   r3,r0
        !            53:        subl2   r3,r1
        !            54:        movl    r3,r2
        !            55:        movblk
        !            56:        subl2   r3,r0
        !            57:        subl2   r3,r1
        !            58:        subl2   r3,r4
        !            59: 5:
        !            60:        cmpl    r4,r3
        !            61:        jgtr    4b
        !            62:        movl    r4,r2
        !            63:        subl2   r2,r0
        !            64:        subl2   r2,r1
        !            65:        movblk
        !            66:        movl    4(fp),r0
        !            67:        ret

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