[Bug c/38510] New: Matrix.c from pymol 1.1r2 fails to compile with -O2 -fgraphite

["howarth at nitro dot med dot uc dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

The source file pymol-1.1/layer0/Matrix.c fails to compile under gcc trunk with
either '-O2 -fgraphite-identity' or '-O1 -fgraphite-identity'. In the first
case the failure is...

gcc-4 -fgraphite-identity -O2 -D_HAVE_LIBPNG -D_PYMOL_MODULE -D_PYMOL_NUMPY
-D_PYMOL_FINK  -c -o Matrix.o Matrix.iMatrix.c: In function
?pymol_rg_?:Matrix.c:3059: error: edge from 641 to 9 should be marked
irreducible
Matrix.c:3059: error: basic block 644 should be marked irreducible
Matrix.c:3059: error: edge from 644 to 642 should be marked irreducible
Matrix.c:3059: error: edge from 640 to 11 should be marked irreducible
Matrix.c:3059: internal compiler error: in verify_loop_structure, at
cfgloop.c:1569

In the second case, the failure is...

gcc-4 -fgraphite-identity -O1 -D_HAVE_LIBPNG -D_PYMOL_MODULE -D_PYMOL_NUMPY
-D_PYMOL_FINK -c -o Matrix.o Matrix.i
Matrix.c: In function ?MatrixFitRMSTTTf?:
Matrix.c:963: internal compiler error: in canonicalize_loop_ivs, at
tree-parloops.c:1385

Only '-O0 -fgraphite-identity' compiles this source file without compile time
errors.


-- 
           Summary: Matrix.c from pymol 1.1r2 fails to compile with -O2 -
                    fgraphite
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: howarth at nitro dot med dot uc dot edu
 GCC build triplet: i686-apple-darwin9
  GCC host triplet: i686-apple-darwin9
GCC target triplet: i686-apple-darwin9


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38510