[Bug rtl-optimization/51040] New: ICE: RTL check: access of elt 1 of 'not' with last elt 0 in gen_rtx_fmt_ee_stat, at ./genrtl.h:33 with __atomic_nand_fetch()

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51040

             Bug #: 51040
           Summary: ICE: RTL check: access of elt 1 of 'not' with last elt
                    0 in gen_rtx_fmt_ee_stat, at ./genrtl.h:33 with
                    __atomic_nand_fetch()
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 25759
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25759
reduced testcase

Compiler output:
$ gcc testcase.c 
testcase.c: In function 'foo':
testcase.c:6:30: internal compiler error: RTL check: access of elt 1 of 'not'
with last elt 0 in gen_rtx_fmt_ee_stat, at ./genrtl.h:33
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

RTL checking might be needed to reproduce this.

Tested revisions:
r181174 - crash