RFA (fold): PATCH for c++/49290 (folding *(T*)(ar+10))

[Richard Guenther]

On Mon, 13 Jun 2011, Jason Merrill wrote:

> On 06/13/2011 06:51 AM, Richard Guenther wrote:
> > But I suppose you want the array-ref be folded to a constant eventually?
> 
> Right.
> 
> I'm not going to keep arguing about VIEW_CONVERT_EXPR, but that brings me back
> to my original question: is it OK to add a permissive mode to the function, or
> should I copy the whole thing into the front end?

I think you should copy the whole thing into the front end for now.

Note that we want to arrive at a point where our constant folding
can handle the MEM_REF case for arbitrary constant constructors.
See fold_const_aggregate_ref in gimple-fold.c - probably not usable
from the frontend directly though.  And it doesn't yet handle
non-array constructors without having a component-ref tree.
But if we eventually have all the code in that routine you might
switch to it instead.

Richard.