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[Bug tree-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast
- From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 05 Dec 2011 10:26:52 +0000
- Subject: [Bug tree-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast
- Auto-submitted: auto-generated
- References: <bug-50904-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50904
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |NEW
Component|rtl-optimization |tree-optimization
AssignedTo|ebotcazou at gcc dot |unassigned at gcc dot
|gnu.org |gnu.org
--- Comment #43 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-12-05 10:26:52 UTC ---
> Argh. It seems LIM didn't get proper lifting both at tuplification and
> alias-improvements time. So it's memory handling (everything it does
> with VOPs) is a little very much conservative (read: it doesn't really work).
OK, re-recategorizing for further investigation.