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[Bug c++/13776] [tree-ssa] Many C++ compile-time regression in 3.5-tree-ssa 040120
- From: "dberlin at dberlin dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 13 Mar 2004 02:08:33 -0000
- Subject: [Bug c++/13776] [tree-ssa] Many C++ compile-time regression in 3.5-tree-ssa 040120
- References: <20040120183908.13776.kgardas@objectsecurity.com>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From dberlin at dberlin dot org 2004-03-13 02:08 -------
Subject: Re: [tree-ssa] Many C++ compile-time regression in 3.5-tree-ssa 040120
> You must have an incredibly large number of basic blocks or something,
> or a very weird flowgraph.
> How many BB's are we talking about?
>
> I can't fix the algorithmic properties of the SSAPRE algorithm we use,
> which is what you are running into, i'm betting.
>
> I'm working on a new PRE implementation that is O(n^2) memory usage in
> the number of phi nodes, but should be a bit faster overall.
>
Regardless, i'll see if i can find a machine with enough memory to look
at these.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13776