Re: New development branch: ia64-fp-model-branch

[Paolo Bonzini <bonzini at gnu dot org>]

> > > 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