[Bug middle-end/51895] New: [4.7 Regression] ICE in simplify_subreg

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51895

             Bug #: 51895
           Summary: [4.7 Regression] ICE in simplify_subreg
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jakub@gcc.gnu.org
                CC: bergner@gcc.gnu.org
            Target: powerpc64-linux


struct S
{
  long a;
  char b;
  S () : a (0), b (0) {}
  bool baz ();
};

__attribute__((noinline)) static bool
bar (S x, S y)
{
  y = x;
  return y.baz ();
}

bool
foo (S x)
{
  S y;
  return bar (x, y);
}

ICEs at -O2 -m64 with:
rh782868.ii: In function âbool foo(S)â:
rh782868.ii:20:19: internal compiler error: in simplify_subreg, at
simplify-rtx.c:5420
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.