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[Bug target/37367] [4.4 Regression] gcc-4.4 speed regression
- 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: 31 Jan 2009 14:33:08 -0000
- Subject: [Bug target/37367] [4.4 Regression] gcc-4.4 speed regression
- References: <bug-37367-12873@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from rguenth at gcc dot gnu dot org 2009-01-31 14:33 -------
I would say this needs a much more detailed pipeline description. (btw, what
is diffed against what? i.e. which variant is faster? ;))
As we have %r9 and %r9d access I would say this may be some artifacts in
HW register renaming. What exact CPU are you using btw? Is this maybe
fixed if you specify that exact CPU with -mtune= ?
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Priority|P2 |P3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37367