This is a common mistake.
Just declare ticks as volatile.
~d
On Tuesday 22 October 2002 20:37, Paul Burke wrote:
> I'm having a lot of trouble with the way GCC treats various objects. In
> particular, if I want to pass falgs about in my program, unless I'm very
> pernickety it optimeses them out, assuming they aren't wanted. For
> example: (ticks is incremented by an interrupt)
>
> void wait_ticks( unsigned int nticks)
> {
> unsigned int t;
>
> t = ticks;
>
> while( (ticks-t) < nticks)
> ;
> }
>
> If I don't declare ticks as volatile, I get this:
>
> 000047d4 <wait_ticks>:
> 47d4: 0e 43 clr r14 ;
> 47d6: 0e 9f cmp r15, r14 ;
> 47d8: fe 2b jnc $-2 ;abs dst addr
> 0x47d6
> 47da: 30 41 ret
>
> which just hangs.
>
> Is there any way of forcing the compiler to assume everything is
> volatile? Why does it do this anyway?
>
> Paul Burke
>
>
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