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[Bug target/34163] 10% performance regression since Nov 1 on Polyhedron's "NF" on AMD64
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 22 Apr 2008 16:43:16 -0000
- Subject: [Bug target/34163] 10% performance regression since Nov 1 on Polyhedron's "NF" on AMD64
- References: <bug-34163-13404@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from ubizjak at gmail dot com 2008-04-22 16:43 -------
(In reply to comment #2)
> Well, this bug needs proper analysis and a testcase, but yes, I also see this
> slowdown.
Richi, the only difference in generated code is by backing out your patch [1]
[1] http://gcc.gnu.org/viewcvs?view=rev&revision=129796
Other suspected patches have no effect on generated code for "gfortran
-march=opteron -ffast-math -funroll-loops -ftree-loop-linear -ftree-vectorize
-msse3 -O3"
I will check execution times, but since I have Core2, perhaps there will be no
slowdown. Can you try to benchmark on your target with [1] backed out?
--
ubizjak at gmail dot com changed:
What |Removed |Added
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34163