[Bug c++/13776] [tree-ssa] Many C++ compile-time regression in 3.5-tree-ssa 040120

[dberlin at dberlin 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.



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13776