At 16.35 22/01/98 EST, you wrote:
>
>On Thu, 22 Jan 1998 18:02:20 +0100 Giorgio Alboni
><rac1337@PROVINCIA.RA.IT> writes:
>>I'm writing a C compiler fo microchip 16C84. The output is a full
>>commented
>>MPLAB assembler file. I just made the parser and a part of compiler.
>>Give a look at this code (c -> asm) and tell me what do you think.
>
>
>       That looks pretty neat!  The case where you're setting a variable
>to zero could be a special case.  Instead of using movlw 0, movwf
>variable, you could just do clrf variable.

This can be made in a optimization fase.

>  Also, where is the variable
>memory allocation being done?  In writing asm code, I tend to do it
>inside the subroutine using cbank and endc.  If no address is given for
>the cbank, it uses the next available address.

Your right, I don't now how but in my letter I forget the begin of asm
file, it's:

LIST   P=PIC16C84
        include <p16c84.inc>
        include "16Cxx.h"

CBLOCK  0x0C
                incPortA_b
                incPortA_a
                main_c2
                main_c1
                __CCTemp1
                main_c2
                main_c1
                PORTB
                PORTA
ENDC
                ORG     0
                goto    main
                nop
                nop
                nop
                goto    interrupt


> Then there's the issue of
>ram re-use.  I generally haven't dealt with it, but local automatic
>variables could be released from ram on exit of the subroutine (easy with
>a stack... but we don't have one unless you want to build one using FSR).

This is a big problem. I think that PIc have a lot of ram location. I want
to make a C compiler thats help in writing asm code. The pic programmer
must know what the C compiler do so he can write a simple mix of C and asm
code (with asm {} primitive).
The pics are too small for support a run time C support and in the most
case it's no necessary.

>       I'd like to see the compiler.  Is it available on the web?  If
>not, you can email it to me at harold@hallikainen.com  .
>

For now no, in the next day (i think 26-1).
Bye.
Giorgio Alboni.


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Alboni Giorgio
Faenza (Ra) ITALY
E-Mail: rac1337@racine.ravenna.it

http://www.geocities.com/SiliconValley/Heights/5444
(Last Update: 29/09/97)
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