[Bug tree-optimization/46099] New: [4.5/4.6 Regression] ICE: in replace_ssa_name, at tree-cfg.c:5643 with -ftree-parallelize-loops -g

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46099

           Summary: [4.5/4.6 Regression] ICE: in replace_ssa_name, at
                    tree-cfg.c:5643 with -ftree-parallelize-loops -g
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Created attachment 22096
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22096
reduced testcase

Compiler output:
$ gcc -ftree-parallelize-loops=2 -g -O pr46099.c 
pr46099.c: In function 'foo':
pr46099.c:7:1: internal compiler error: in replace_ssa_name, at tree-cfg.c:5643
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r165719 - crash
r158095 - crash
r153685 - OK
4.5 r163761 - crash
4.4 r160770 - OK