RE: [avr-gcc-list] Compile Error

[Trampas]

Yeap it is correct... 

a=a+1 is the same as a=a-(-1) and when using fixed point math with an 8 bit
value 255 is a -1. 


Regards,
Trampas 
  
 

-----Original Message-----
From: address@hidden [mailto:address@hidden
On Behalf Of lgp
Sent: Saturday, January 22, 2005 3:46 AM
To: avr-gcc-list
Subject: [avr-gcc-list] Compile Error

Source file is:

int main( void ){
        unsigned char a;
        a++;
        while(1);
}


List file is:

int main( void ){
  8e:   ce e5           ldi     r28, 0x5E       ; 94
  90:   d4 e0           ldi     r29, 0x04       ; 4
  92:   de bf           out     0x3e, r29       ; 62
  94:   cd bf           out     0x3d, r28       ; 61
        unsigned char a;
        a++;
  96:   89 81           ldd     r24, Y+1        ; 0x01
  98:   8f 5f           subi    r24, 0xFF       ; 255
  9a:   89 83           std     Y+1, r24        ; 0x01
        while(1);
  9c:   ff cf           rjmp    .-2             ; 0x9c




Is it right??

        a++;
  96:   89 81           ldd     r24, Y+1        ; 0x01
>>  98: 8f 5f           subi    r24, 0xFF       ; 255 ??????
  9a:   89 83           std     Y+1, r24        ; 0x01



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