Mike Harrison escreveu:
> (posted before but forgot tag....)
>
> WTF is going on with the Hi-Tech compiler that ships with MPLAB....
> A few samples below  (all vars are global chars)., target 16F818
>
> Can anyone think of any explanation for such poor code generation other t=
han deliberately making it
> slow to make their paid-for compiler look better ? =

>
> It can't be doing Microchip any favours shipping such a poor performing c=
ompiler with MPLAB as it
> makes their chips look slow and inefficient.  =

>   =


Well, now Hi-Tech belongs to Microchip...


>
> 365:               irrxsum1+=3Dirbyte1;
>    115    087A     MOVF 0x7a, W
>    116    00C3     MOVWF 0x43
>    117    0843     MOVF 0x43, W
>    118    07F4     ADDWF 0x74, F
>
> Should be 2 instructions
>
> 366:               ircnt1=3D0;
>    119    1003     BCF 0x3, 0
>    11A    3000     MOVLW 0
>    11B    1803     BTFSC 0x3, 0
>    11C    3001     MOVLW 0x1
>    11D    00FB     MOVWF 0x7b
>
> This is especially bizarre - should be 1 CLRF instruction
>
> 349:               irtmr1+=3Dbittime2; // bittime2 is a constant
>    0DF    300E     MOVLW 0xe
>    0E0    00C3     MOVWF 0x43
>    0E1    0843     MOVF 0x43, W
>    0E2    07F5     ADDWF 0x75, F
>
> Should be 2 instructions
>
>
> 350:               ircnt1++;
>    0E3    3001     MOVLW 0x1
>    0E4    00C3     MOVWF 0x43
>    0E5    0843     MOVF 0x43, W
>    0E6    07FB     ADDWF 0x7b, F
>
> Should be 1 INCF instruction
>
> 322:               irin=3DPORTA;
>    090    0805     MOVF 0x5, W
>    091    00C3     MOVWF 0x43
>    092    0843     MOVF 0x43, W
>    093    00FC     MOVWF 0x7c
>
> Why is it storing in two places?
>   =



Some time ago I pointed this out, but some people think it is perfectly
normal.


Regards,

Isaac

__________________________________________________
Fa=E7a liga=E7=F5es para outros computadores com o novo Yahoo! Messenger =

http://br.beta.messenger.yahoo.com/ =


-- =

http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist