Re: [avr-gcc-list] How to (efficeiently !!!) test a bit within amulti-byte integer ?

[Jurek Szczesiul]

>> 
>> unsigned char temp;
>> 
>> temp = (address >> 16) & 0xFF;
>> 
>> if(temp & 0x04)
> 
> 

Hi Vince !
You could also try to retrieve directly the 2. ( from 0) byte of ulong and check
the bit , something like this ( -Os) :

if( *((uchar*)&long1+2) & 0x4) PORTB = 0x1;
  8c: 80 91 65 00  lds r24, 0x0065
  90: 82 ff        sbrs r24, 2
  92: 02 c0        rjmp .+4       ; 0x98
  94: 81 e0        ldi r24, 0x01 ; 1
  96: 88 bb        out 0x18, r24 ; 24

(long1 located at 0x63-0x66 here - Atmega8)

HTH
Best regards Jurek S.