[Bug rtl-optimization/45728] New: ICE: in gen_lowpart_general, at rtlhooks.c:59 at -O1 when comparing union members

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

PR33380 and PR40199 look similiar, but this might be different.

Compiler output:
$ gcc -O testcase.c
testcase.c: In function 'foo':
testcase.c:13:11: internal compiler error: in gen_lowpart_general, at
rtlhooks.c:59
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r164287 - crash
r153685 - crash
4.5 r163761 - crash
4.4 r160770 - crash
4.4 r149995 - crash


-- 
           Summary: ICE: in gen_lowpart_general, at rtlhooks.c:59 at -O1
                    when comparing union members
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zsojka at seznam dot cz
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45728