[Bug tree-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast

[ebotcazou at gcc dot gnu.org]

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.