--- Comment #8 from rguenther at suse dot de 2010-03-22 10:01 ---
Subject: Re: [4.4/4.5 Regression] gcc-4.4/4.5 speed
regression
On Sun, 21 Mar 2010, hjl dot tools at gmail dot com wrote:
--- Comment #7 from hjl dot tools at gmail dot com 2010-03-21 16:20
---
(In reply
--- Comment #9 from jakub at gcc dot gnu dot org 2010-03-22 10:47 ---
From the numbers Vladimir posted for SPEC2k, x86_64 -mtune=generic vs.
-mtune=core2 has the same rate for SPECint, with core2 slightly smaller code
size, for SPECfp -mtune=core2 has 0.4% worse rate due to 10% drop on
--- Comment #10 from jakub at gcc dot gnu dot org 2010-03-22 10:49 ---
Created an attachment (id=20157)
-- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20157action=view)
gcc-minimal-tune=core2.patch
Here is a minimal (and untested too) patch for that.
A bigger patch would drop all
--- Comment #5 from steven at gcc dot gnu dot org 2010-03-21 12:20 ---
Bug in WAITING for a long time, no feedback. Very small, hard-to-catch code
difference. It's been noted before that the core2 scheduler description
(contributed by Intel itself!) often results in worse code than the
--- Comment #6 from howarth at nitro dot med dot uc dot edu 2010-03-21
14:44 ---
Shouldn't there be a PR about the suboptimal performance from the core2 tuning
(in hopes that original contributors from Intel will revisit these issues)?
--
--- Comment #7 from hjl dot tools at gmail dot com 2010-03-21 16:20 ---
(In reply to comment #6)
Shouldn't there be a PR about the suboptimal performance from the core2 tuning
(in hopes that original contributors from Intel will revisit these issues)?
Intel didn't contribute
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jakub at gcc dot gnu dot org changed:
What|Removed |Added
Target Milestone|4.4.3 |4.4.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37367
--
jakub at gcc dot gnu dot org changed:
What|Removed |Added
Target Milestone|4.4.2 |4.4.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37367
--
jakub at gcc dot gnu dot org changed:
What|Removed |Added
Target Milestone|4.4.1 |4.4.2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37367
--
jakub at gcc dot gnu dot org changed:
What|Removed |Added
Target Milestone|4.4.0 |4.4.1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37367
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