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[Bug target/33604] [4.3/4.4 Regression] Revision 119502 causes significantly slower results with 4.3/4.4 compared to 4.2
- From: "bonzini at gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 2 Mar 2008 12:26:50 -0000
- Subject: [Bug target/33604] [4.3/4.4 Regression] Revision 119502 causes significantly slower results with 4.3/4.4 compared to 4.2
- References: <bug-33604-15171@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #39 from bonzini at gnu dot org 2008-03-02 12:26 -------
Subject: Re: [4.3/4.4 Regression] Revision 119502 causes
significantly slower results with 4.3/4.4 compared to 4.2
> The problem still exists for the first two test cases.
> As I noted in comment #8 there is a significant speedup from -O2 to -O3 for
> g++-4.2 (18s -> 5s)
> With the current g++-4.3 there is no difference between -O2 and -O3 (both 14s)
> "-fforce-addr" which produced significant speedup does not exist anymore.
So maybe we need to restore part of -fforce-addr's behavior, but not the
one that caused regressions.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33604