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Re: Loop optimizer issues
- From: Gerald Pfeifer <gerald at pfeifer dot com>
- To: Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>
- Cc: Diego Novillo <dnovillo at redhat dot com>,"gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>,Richard Henderson <rth at redhat dot com>, Jason Merrill <jason at redhat dot com>,pop at gauvain dot u-strasbg dot fr, Jan Hubicka <jh at suse dot cz>,Daniel Berlin <dberlin at dberlin dot org>
- Date: Wed, 30 Jul 2003 00:02:07 +0200 (CEST)
- Subject: Re: Loop optimizer issues
- References: <20030530183552.GA27110@atrey.karlin.mff.cuni.cz><1054585449.9789.146.camel@frodo.toronto.redhat.com><20030727224601.GA5476@atrey.karlin.mff.cuni.cz>
On Mon, 28 Jul 2003, Zdenek Dvorak wrote:
> I am basically done with the work on rtl-level optimizer. [...] I have
> done some testing (it bootstraps now on x86, powerpc and ia64) and
> benchmarking (there are a few regressions to investigate, see attached
> results of SPECs).
Just a note: today I compared mainline against tree-ssa, and the code
generated by tree-ssa with -O3 is 25% slower, so merging something else
which may cause performance regressions doesn't seem like a good idea.
Gerald