C nebo ASM?

[Andrej Jancura]

----- Original Message ----- 
From: "Jan Waclawek" <konfera@efton.sk>
To: "HW-news" <hw-list@list.hw.cz>
Sent: Friday, May 22, 2009 11:32 AM
Subject: Re: C nebo ASM?

...
Zaver: toto zda sa ziadny jednocipovy kompilator neriesi ako
(auto)inkrementovany pointer.

wek

---
Jano, zda sa ze ano. Tu je zdrojak a asm. Dolezity je riadok 24 v listingu. 
movf 4 je adresovy register RAM a movf 0,w su data. decf 76,f a addlw 44 je 
prave ta autodekrementacia...

A.


unsigned char sum2()
{
    Number_of_Bytes = 32;    // 0...31
    Sum = 0;

    do {
    Sum += Array[--Number_of_Bytes];
    } while(Number_of_Bytes != 0);

    return(Sum);
}


 psect text23
 file "test.c"
 line 17
_sum2:
 opt stack 7
 line 18
; Regs used in _sum2: [wreg-fsr0h+status,2+status,0]
;test.c: 18: Number_of_Bytes = 32;
 movlw 32
 movwf 76
 line 19
;test.c: 19: Sum = 0;
 clrf 77
 line 21
;test.c: 21: do {
l4:
 line 24
;test.c: 24: Sum += Array[--Number_of_Bytes];
 decf 76,f
 movf 76,w
 addlw 44
 movwf 4
 movf 0,w
 addwf 77,f
 line 26
;test.c: 26: } while(Number_of_Bytes != 0);
 movf 76,f
 btfss 3,2
 goto l4
 line 28
;test.c: 28: return(Sum);
 movf 77,w
 line 29
;test.c: 29: }
 return


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