[Bug tree-optimization/43026] New: ICE in sese.c with -fgraphite-identity in 447.dealII

[janis at gcc dot gnu dot org]

GCC trunk gets an internal compiler error when building SPEC CPU2006 test
447.dealII on powerpc64-linux with "-O2 -fgraphite-identity" or "-O2
-floop-parallelize-all" for either -m32 or -m64, as demonstrated by a minimized
testcase that I'll attach to this PR.  Perhaps someone else will be able to
minimize it more.

elm3b149% /home/janis/tools/gcc-trunk-anonsvn/bin/g++ -c -O2
-fgraphite-identity bug.cc
bug.cc: In member function ‘void Base<dim>::getf2d(vector<Tensor<2, dim> >&)
const [with int dim = 3]Â’:
bug.cc:38:6: internal compiler error: in expand_scalar_variables_expr, at
sese.c:907
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

The testcase and dealII compile correctly with GCC 4.4.2 using "-O2
-fgraphite-identity".  The failure starts with this patch:

    http://gcc.gnu.org/viewcvs?view=rev&rev=155739

    r155739 | spop | 2010-01-08 16:07:18 +0000 (Fri, 08 Jan 2010)


-- 
           Summary: ICE in sese.c with -fgraphite-identity in 447.dealII
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: janis at gcc dot gnu dot org
GCC target triplet: powerpc64-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43026