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Re: [PATCH] Fix PR54489 - FRE needing AVAIL_OUT
- From: Steven Bosscher <stevenb dot gcc at gmail dot com>
- To: Richard Guenther <rguenther at suse dot de>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Wed, 12 Sep 2012 16:52:27 +0200
- Subject: Re: [PATCH] Fix PR54489 - FRE needing AVAIL_OUT
- References: <alpine.LNX.2.00.1209121556390.28649@zhemvz.fhfr.qr>
On Wed, Sep 12, 2012 at 4:02 PM, Richard Guenther wrote:
> for a followup (and I bet sth else than PRE blows up at -O2 as well).
Actually, the only thing that really blows up is that enemy of scalability, VRP.
With -O2 -fno-tree-{pre,fre,vrp}, the slowest part of the compiler on
this test case are dominance computation, dominator-based
optimization, and tree CFG cleanup, but they all scale linearly with
the number of X'es in the test case :-)
Ciao!
Steven