Re: [avr-gcc-list] Optimization bug in AVRGCC 3.3 compiler

[Marek Michalkiewicz]

On Fri, Apr 04, 2003 at 10:25:44PM +0400, Alexei Semenov wrote:
> Following C code produces inapplicable assembler code with
> WinAVR-20030312:
> 
> #include <avr/io.h>
> 
> int main(void)
> {
>    unsigned char v= 0;
>    for(;;)
>    {
>       if ((PIND ^ v) & 1) // do wrong compiling
>       {
>           v= ~v;
>           PORTB= v;
>       }
>    }
> }

Thanks.  Looks like PORTB write optimized away as if there was no
"volatile".  I couldn't reproduce this with avr-gcc 3.3 20030405
from CVS.  So, the bug should be gone with a new WinAVR release...

Marek