[PATCH] Fix PR59471

[Jakub Jelinek]

On Tue, Jan 07, 2014 at 04:12:57PM +0100, Richard Biener wrote:
> > What about if something post gimplification creates VCE(BFR(VCE())) or
> > similar and tries to force_gimple_operand_gsi or similar, then without
> > making the above invalid in the predicates we'd still not try to gimplify it
> > at all (because it would pass the predicate), and then hit the verification
> > ICE.
> 
> I don't think it passes any predicate, certainly not is_gimple_val,
> so we enter gimplification anyway.  Or am I missing something?

It isn't is_gimple_val, sure, I was thinking about whatever predicate we
have for say the RHS of a load, is that is_gimple_addressable?  There is
is_gimple_lvalue too.  Apparently we are calling force_gimple_operand_1*
with just is_gimple_condexpr if it is not is_gimple_val or
is_gimple_reg_rhs, so perhaps we are fine.

	Jakub