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[Bug target/77468] [7 Regression] C-ray regression on Aarch64
- From: "jgreenhalgh at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 14 Feb 2017 18:07:05 +0000
- Subject: [Bug target/77468] [7 Regression] C-ray regression on Aarch64
- Auto-submitted: auto-generated
- References: <bug-77468-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77468
James Greenhalgh <jgreenhalgh at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
--- Comment #23 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
I see a 13% performance improvement between trunk with ktkachov's patch applied
and yesterday's trunk when compiling with -mcpu=cortex-a53 . In my tests
-mcpu=cortex-a53 is equivalent to -mcpu=thunderx (-mcpu=cortex-a53 comes out
slightly ahead, but not in a significant way, and not in a way I'd expect to
reproduce across platforms).
My only guess (from the magnitude of the difference you still see, and the
improvement expected from ktkachov's patch) is that you didn't pick up the
changes (perhaps they were not in the 20170214 snapshot you used?). We're going
to be at an impasse here, as I can't validate your toolchain or environment,
but everything I can see, and our analysis of the bug to this point, suggests
that this can be considered fixed on trunk.