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Re: Fix DCE for GVN-PRE
- From: Diego Novillo <dnovillo at redhat dot com>
- To: Steven Bosscher <stevenb at suse dot de>
- Cc: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Date: Thu, 10 Jun 2004 20:09:04 -0400
- Subject: Re: Fix DCE for GVN-PRE
- Organization: Red Hat Canada
- References: <200406110147.48613.stevenb@suse.de>
On Thu, 2004-06-10 at 19:47, Steven Bosscher wrote:
> * tree-ssa-dce.c (mark_control_dependent_edges_necessary):
> Don't try to mark anything control dependent on the entry or
> exit blocks.
>
Hmm, why did we think that the successor of ENTRY is control dependent
on ENTRY? After all, it does postdominate ENTRY. Aren't you papering
over a bug in the computation of control depenencies?
Diego.