New development branch: ia64-fp-model-branch

[Paolo Bonzini]

 > > > Implementation of #pragma _USE_SF will definitely require front-end
 > > > changes, as GCC currently has no support for lexically-scoped 
#pragma.
 > > > (This feature is desirable for C99 and OpenMP support as well.)

>>This is slightly different from OpenMP, where all the lowering is done
>>way before the backend are reached.
>>    
>>
>No, Zack is right, it's exactly the same problem.  We don't have support 
>for lexically scoped #pragmas right now, and we do need to propagate this
>knowledge through the front end.
>  
>
I agree that from the front-end perspective this is the same.  But his 
project has added complexity, because gomp would localize everything 
into a lowering pass: he wrote

> > > Assuming some mechanism for propagating the information all the way
> > > through the tree optimizers, the backend needs only check the state of
> > > the #pragma in expanders and choose the appropriate pattern.

No such propagation mechanism is needed for gomp.

>Hail to the new parser.
>  
>
Yeah! :-)

Paolo