[Bug tree-optimization/45120] New: [4.6 Regression] -fipa-pta causes FAIL: gcc.c-torture/execute/pta-field-2.c execution

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

With -fipa-pta in flags, pta-field-2.c FAILs:

FAIL: gcc.c-torture/execute/pta-field-2.c execution,  -O2 
FAIL: gcc.c-torture/execute/pta-field-2.c execution,  -O3 -fomit-frame-pointer 
FAIL: gcc.c-torture/execute/pta-field-2.c execution,  -O3 -g 
FAIL: gcc.c-torture/execute/pta-field-2.c execution,  -Os 
FAIL: gcc.c-torture/execute/pta-field-2.c execution,  -O2 -flto 

Command line:
$ gcc -O2 -fipa-pta pta-field-2.i
$ ./a.out
Aborted

The code might be undefined, but even -fno-strict-aliasing doesn't help:
$ gcc -O2 -fipa-pta pta-field-2.i -fno-strict-aliasing
$ ./a.out
Aborted

Tested revisions:
r162653 - fail
r161659 - fail
r161170 - OK


-- 
           Summary: [4.6 Regression] -fipa-pta causes FAIL: gcc.c-
                    torture/execute/pta-field-2.c execution
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-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=45120