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[Bug tree-optimization/46172] New: ICE: in expand_widen_pattern_expr, at optabs.c:522 with -ftree-vectorize -fno-tree-dce


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46172

           Summary: ICE: in expand_widen_pattern_expr, at optabs.c:522
                    with -ftree-vectorize -fno-tree-dce
           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 22152
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22152
reduced testcase

Output - 4.6 (trunk):
$ gcc -ftree-vectorize -O -fno-tree-dce pr46172.c  
pr46172.c: In function 'foo':
pr46172.c:3:5: internal compiler error: in expand_widen_pattern_expr, at
optabs.c:522
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Output - 4.5:
$ gcc -ftree-vectorize -O -fno-tree-dce pr46172.c 
pr46172.c: In function 'foo':
pr46172.c:3:5: internal compiler error: in expand_expr_real_2, at expr.c:8275
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Output - 4.4:
$ gcc -ftree-vectorize -O -fno-tree-dce pr46172.c 
pr46172.c: In function 'foo':
pr46172.c:3: internal compiler error: in c_expand_expr, at c-common.c:5015
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r165915 - crash
4.5 r165781 - crash
4.4 r165781 - crash
4.4 r149995 - crash


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