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Re: PR c++/5504: Optimization breaks wei-ku-1 from blitz
- From: Richard Henderson <rth at redhat dot com>
- To: Jan Hubicka <jh at suse dot cz>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Tue, 16 Apr 2002 09:27:40 -0700
- Subject: Re: PR c++/5504: Optimization breaks wei-ku-1 from blitz
- References: <20020326050034.GA29663@tornado.toronto.redhat.com> <wvlhempwz9b.fsf@prospero.cambridge.redhat.com> <20020409000042.A7972@redhat.com> <20020409140208.A8797@redhat.com> <20020416155448.GD23898@atrey.karlin.mff.cuni.cz>
On Tue, Apr 16, 2002 at 05:54:48PM +0200, Jan Hubicka wrote:
> Zdenek has patch to kill the BASIC_BLOCK array that will hopefully
> handle this once forever.
Yep.
> Similar problem lies in crossjumping and other cfg_cleanup
> simplifications that can run into similar quadratic cases.
Maybe. I think the very first delete_unreachable_blocks call
is pretty much always going to get the worst of it.
r~