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[Bug target/38824] [4.4 regression] performance regression of sse code from 4.2/4.3
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 13 Jan 2009 15:07:19 -0000
- Subject: [Bug target/38824] [4.4 regression] performance regression of sse code from 4.2/4.3
- References: <bug-38824-12873@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #1 from rguenth at gcc dot gnu dot org 2009-01-13 15:07 -------
I don't see how this changes could cause more branch misses. If you do the
same .palign for the 4.4 code does the regression vanish? I would suspect
that the loop-stream detector catches one but not the other form for some
reason. Maybe the Intel folks can properly analyze this - HJ?
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
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CC| |hjl at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38824