libffi & powerpc

[Mike Stump]

On May 15, 2007, at 2:20 AM, Patrick Olinet wrote:
> Finally, I've tried it the dirty way, ie by commenting out all the  
> "stfd" instructions at the beginning of the ppc_closure.S file and  
> things seem to work !!!

Wonderful.  If you could, would you submit the patch to gcc- 
patches...  I suspect it is better than nothing, and it might be  
trivial enough to go in without paperwork.  Additionally, it might  
provide a basis for another contributor to build upon, as they then  
only have to do half the work.

Thanks.

> What worries me a bit is that "stfd" instructions are used to save  
> fpu registers states before the call (it's my guess) and I would  
> expect them to be restored afterwards, probably with "lfd" assembly  
> instructions (that I would need to comment out as well). But I  
> can't see such instructions...

> Any thoughts about that ?

Sure, don't worry about it, there is no matching instruction.  You  
just can't do functions that return float/double/long double from my  
quick reading.

> And should I report a new bug for this libffi/powerpc problem ?

We prefer to have a bug report for each bug...  :-)