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.
(This is a very stupid program).

byte PORTA,PORTB;

void interrupt ()
{}

void incPortA (byte a,byte b)
{
  PORTA+=a;
  if (PORTA)
      PORTA++;
    else
      PORTA+=10;
}

void main ()
{
  byte c1,c2;
  PORTA=12;
  PORTB=12;
  c1=0;
  c2=0;
  c1=c2+3+(c1-1);
  incPortA(c2,c1);
}

Output of compiler:
upt


interrupt:                                      ; Function definition
                retfie                  ; End Function definition: interrupt



incPortA:                                       ; Function definition
; Expression: PORTA+=a;
                movf    incPortA_a,0
                addwf   PORTA,0         ; Make: PORTA+=a
                movwf   PORTA
ifSt0:                                  ; if (PORTA)
                movf    PORTA,0
                sublw   d'0'            ; Test if condition
                btfsc   _z
                goto    ifSt0else
; Expression: PORTA++;
                movf    PORTA,0
                incf    PORTA,1         ; Make: PORTA++
                goto    ifSt0end
ifSt0else:
; Expression: PORTA+=10;
                movlw   d'10'
                addwf   PORTA,0         ; Make: PORTA+=10
                movwf   PORTA
ifSt0end:
                return                  ; End Function definition: incPortA



main:                                   ; Function definition
; Expression: PORTA=12;
                movlw   d'12'
                movwf   PORTA           ; Save result of: PORTA=12
; Expression: PORTB=12;
                movlw   d'12'
                movwf   PORTB           ; Save result of: PORTB=12
; Expression: c1=0;
                movlw   d'0'
                movwf   main_c1         ; Save result of: c1=0
; Expression: c2=0;
                movlw   d'0'
                movwf   main_c2         ; Save result of: c2=0
; Expression: c1=c2+3+(c1-1);
                movlw   d'3'
                addwf   main_c2,0               ; Make: c2+3
                movwf   __CCTemp1               ; Save result of: c2+3
                movlw   d'1'
                subwf   main_c1,0               ; Make: c1-1
                addwf   __CCTemp1,0             ; Make: c2+3+(c1-1)
                movwf   main_c1         ; Save result of: c1=c2+3+(c1-1)
; Expression: incPortA(c2,c1);
                movf    main_c2,0
                mowf    main_a
                movf    main_c1,0
                mowf    main_b
                call    incPortA                ; Make function call: incPortA(c
2,c1)
_endPrg         goto    _endPrg         ; End Function definition: main


If there is someone interested at this program, please contact me. It's free.
Thank's for your time.



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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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