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[Bug tree-optimization/32921] [4.3 Regression] Revision 126326 causes 12% slowdown
- From: "hjl at lucon dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 7 Oct 2007 15:19:38 -0000
- Subject: [Bug tree-optimization/32921] [4.3 Regression] Revision 126326 causes 12% slowdown
- References: <bug-32921-682@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #10 from hjl at lucon dot org 2007-10-07 15:19 -------
(In reply to comment #9)
> Gcc 4.3 revision 128885 is much slower than gcc 4.1 redhat revision 128771
> with -O2 -ffast-math on 64bit Linux/Core 2 Duo:
>
> 437.leslie3d -26.2%
>
The main difference between gcc 4.1 redhat and gcc 4.1 is the -mtune=generic
change. I believe gcc 4.3 will also be much slower than gcc 4.1 on Opteron.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32921