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[Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression
- From: "rakdver at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 8 Feb 2005 00:29:27 -0000
- Subject: [Bug tree-optimization/18687] [4.0 Regression] ~50% compile time regression
- References: <20041127043006.18687.belyshev@depni.sinp.msu.ru>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From rakdver at gcc dot gnu dot org 2005-02-08 00:29 -------
Out of the time spent in ivopts:
-- this patch saves some 25%:
http://gcc.gnu.org/ml/gcc-patches/2004-10/msg00136.html
-- another 25% are caused by inefficient use of # of iterations analysis;
I am thinking about solution
-- yet another 25% are spent in scalar evolutions analysis; I am working on
speeding this up
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18687