[Bug optimization/11846] New: [3.3 regression] mozilla/amd64 miscompilation

["gbeauchesne at mandrakesoft dot com" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11846

           Summary: [3.3 regression] mozilla/amd64 miscompilation
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: gbeauchesne at mandrakesoft dot com
                CC: aj at suse dot de,gcc-bugs at gcc dot gnu dot org,jakub
                    at redhat dot com
  GCC host triplet: x86_64-unknown-linux-gnu

Hi,

mozilla 1.4 is miscompiled on AMD64 with gcc 3.3.1 at -O2. Building
modules/libpr0n/decoders/gif/imgContainerGIF.cpp without GCSE solves the
problem. This is a regression from 3.2.3 available on all 3.3 branches.

I failed to reduce to a simple testcase yet. But I am pretty sure it lies in
imgContainerGIF.cpp (imgContainerGIF::Notify) at first call to inlinedGetFrameAt().