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Re: [tree-ssa] COND_EXPR lowering.
On Fri, 2003-10-24 at 13:03, Diego Novillo wrote:
> On Fri, 2003-10-24 at 12:57, Andrew MacLeod wrote:
>
> > We dont always use stmt replacement do we?
> >
> > the insert_on_edge routines update the COND and THEN parts directly, so
> > it has to be changed there. Perhaps it would be limited to those 2
> > places, Im not sure.
> >
> The important thing is: will the statement iterators stop only at
> COND_EXPR? Or will they also stop at THEN_CLAUSE and ELSE_CLAUSE? If
> the latter is true, then both THEN_CLAUSE and ELSE_CLAUSE need to have
> their BB set and we need to keep that in sync with the COND_EXPR.
>
> Perhaps we ought to change the semantics of COND_EXPR completely and not
> consider its clauses separate statements. If we are going to do this,
> we need to make sure that the iterators never stop at the clauses, only
> at the parent COND_EXPR.
>
Thats what Zdenek saying... they aren't stmts.
And iterators never did look at the clauses... I guess someone iterating
over everything may have decended into the clauses as part of their
processing, but thats all part of the patch. Besides, no one does it now
anyway. Its only an issue when we have the CFG, and then we use block
iterators
Adnrew