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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