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        .file   "memmove.S"

        .section .text

        .global  _memmove

        .type    _memmove,@function

_memmove:

        mov     r1, r4          ; Save a copy of DEST

        cmp     r1, r2

        blt     2f              ; If SRC (r2) is less than DEST (r1) then copy backwards

        smovf

1:

        mov     r4, r1          ; Return DEST

        rts

2:

        add     r3, r1          ; The SMOVB instructions requires the DEST in r1 and the

        add     r3, r2          ; SRC in r2 but it needs them to point the last bytes of

        sub     #1, r2          ; the regions involved not the first bytes, hence these

        sub     #1, r1          ; additions and subtractions.

        smovb

        bra     1b