Hello Chip. I think Andy was going to offer following:


        DECF    LOW,F
        INCFSZ  LOW,W
        INCF    MID,F

        DECF    MID,F
        INCFSZ  MID,W
        INCF    HI,F

        DECF    HI,F

;       ..etc... Carry was not chenged

WBR Dmitry.


Chip Weller wrote:
>
> Andy:
>
> Opps. I should have said a test case of 0x00FFxx where xx is anything
> but 00. Using 0x00FF01 and your outline:
>
>                         ;HI MD LO
>                         ;
>                         ;00 FF 01
>         DECF    HI      ;FF FF 01
>         DECF    MID     ;FF FE 01
>         DECF    LO      ;FF FE 00
>
>         INCFSZ  LO,W    ;FF FE 00    W = 01
>         INCF    MID     ;FF FF FF    MID = 0xFF, so far so good.
>
>         INCFSZ  MID,W   ;FF FF FF    W = 00, thinks overflow occured.
>         INCF    HI      ;01 FF FF    result off by 0x010000 now.
>
> Chip