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[Bug tree-optimization/54776] [4.8 Regression] tramp3d-v4: 20% performance regression using -O3
- From: "markus at trippelsdorf dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 04 Oct 2012 16:16:58 +0000
- Subject: [Bug tree-optimization/54776] [4.8 Regression] tramp3d-v4: 20% performance regression using -O3
- Auto-submitted: auto-generated
- References: <bug-54776-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54776
--- Comment #6 from Markus Trippelsdorf <markus at trippelsdorf dot de> 2012-10-04 16:16:58 UTC ---
(In reply to comment #5)
> I assume it is with linker plugin, right?
Yes.
> I assume you do see improvements with -O3 -fwhole-program? (it improves the
> scores in my setup, I would be curious to see how it compares to other numbers
> you report)
Yes, with -O3 -fwhole-program I get:
Time spent in iteration: 6.34161
(With -fprofile-use -Ofast -march=native:
Time spent in iteration: 2.75908 )