Re: [avr-libc-dev] LPM instructions in optimized code causes unintended behavior in execution

[Wouter van Gulik]

On 17/06/10 10:15, Thomas Carsten Franke wrote:
> Am 17.06.2010 09:38, schrieb Wouter van Gulik:
>    
> > Wouter van Gulik schreef:
> >      
> > > Joerg Wunsch schreef:
> > >        
> > > > As Wouter van Gulik wrote:
> > > >
> > > >          
> > > > > > IMHO, the respective code is hand-crafted asm code in avr-libc.
> > > > > >              
> > > > > Are you sure? The code is about a jump table, is that in avr-libc?
> > > > >            
> > > > Errm, you are right...
> > > >          
> > > We should probably file a bug report at binutils as well. gas is
> > > excepting an 'illegal' instruction. This could mean gcc/gas also
> > > happily generates the undefined LD files?
> > >
> > >        
> Just right now I added a problem report to gcc 4.3.3 version describing
> the problem.

Just for the record the gcc bug id is:44564  
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44564
I think this is a nasty bug, but it is hard to recreate the problem. I 
did a quick scan of GCC but I can't find a reference to a lpm r?, Z+ 
other than those to __temp_reg__.

HTH,

Wouter