[Bug tree-optimization/46886] New: [4.5/4.6 Regression] gfortran.dg/array_constructor_9.f90 FAILs with -ftree-parallelize-loops -fstrict-overflow -fno-tree-ch

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46886

           Summary: [4.5/4.6 Regression]
                    gfortran.dg/array_constructor_9.f90 FAILs with
                    -ftree-parallelize-loops -fstrict-overflow
                    -fno-tree-ch
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 22707
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22707
reduced testcase (hopefully correctly)

Output:
$ gfortran -O -ftree-parallelize-loops=2 -fstrict-overflow -fno-tree-ch
testcase.f90                                   
$ valgrind -q ./a.out 
==7049== Invalid read of size 4
==7049==    at 0x400D33: main (testcase.f90:12)
==7049==  Address 0x6174788 is 0 bytes after a block of size 1,320 alloc'd
==7049==    at 0x4C265BF: realloc (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==7049==    by 0x400C1A: main (testcase.f90:12)
==7049== 
==7049== Invalid write of size 4
==7049==    at 0x400D37: main (testcase.f90:12)
==7049==  Address 0x6174cf8 is 0 bytes after a block of size 1,320 alloc'd
==7049==    at 0x4C2648E: malloc (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==7049==    by 0x400CDD: main (testcase.f90:12)
==7049== 

Tested revisions: (for the reduced testcase)
r167643 - fail
4.5 r166509 - fail (original testcase passes)
4.4 r166509 - OK