[Bug tree-optimization/45965] New: [4.6 Regression] ICE on powerpc-apple-darwin9: gfortran.dg/subref_array_pointer_4.f90

["dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45965

           Summary: [4.6 Regression] ICE on powerpc-apple-darwin9:
                    gfortran.dg/subref_array_pointer_4.f90
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dominiq@lps.ens.fr
                CC: spop@gcc.gnu.org, irar@il.ibm.com
              Host: powerpc-apple-darwin9
            Target: powerpc-apple-darwin9
             Build: powerpc-apple-darwin9


On powerpc-apple-darwin9, between revisions 164750 and 164814 the following
failures

FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer 
(internal compiler error)
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer  (test
for excess errors)
WARNING: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer 
compilation failed to produce executable
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer
-funroll-loops  (internal compiler error)
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer
-funroll-loops  (test for excess errors)
WARNING: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer
-funroll-loops  compilation failed to produce executable
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer
-funroll-all-loops -finline-functions  (internal compiler error)
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer
-funroll-all-loops -finline-functions  (test for excess errors)
WARNING: gfortran.dg/subref_array_pointer_4.f90  -O3 -fomit-frame-pointer
-funroll-all-loops -finline-functions  compilation failed to produce executable
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -g  (internal compiler error)
FAIL: gfortran.dg/subref_array_pointer_4.f90  -O3 -g  (test for excess errors)
WARNING: gfortran.dg/subref_array_pointer_4.f90  -O3 -g  compilation failed to
produce executable

appeared (see http://gcc.gnu.org/ml/gcc-testresults/2010-09/msg02570.html and
http://gcc.gnu.org/ml/gcc-testresults/2010-10/msg00006.html ). These ICEs
disappear with -m64 and the minimal options are '-O1 -ftree-vectorize':

[karma] f90/bug% gfc -O1 -ftree-vectorize
/opt/gcc/_gcc_clean/gcc/testsuite/gfortran.dg/subref_array_pointer_4.f90
/opt/gcc/_gcc_clean/gcc/testsuite/gfortran.dg/subref_array_pointer_4.f90: In
function 'main':
/opt/gcc/_gcc_clean/gcc/testsuite/gfortran.dg/subref_array_pointer_4.f90:21:0:
internal compiler error: Bus error

The ICE disappears when using gdb.

I have had a quick look to the commits in the range and most of the significant
ones are related to graphite (I am trying to reduce the range).