[Bug c/56246] New: [4.8 regression] ICE in assign_by_spills, at lra-assigns.c:1262

["ppluzhnikov at google dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56246

             Bug #: 56246
           Summary: [4.8 regression] ICE in assign_by_spills, at
                    lra-assigns.c:1262
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ppluzhnikov@google.com


Test case:

void NoBarrier_AtomicExchange (long long *ptr) {
  while (__sync_val_compare_and_swap (ptr, 1, 0) );
}

Using g++ (GCC) 4.8.0 20130205 (experimental):

g++ -c -m32 -O2 -fPIC -fno-omit-frame-pointer test.ii

test.ii: In function 'void NoBarrier_AtomicExchange(long long int*)':
test.ii:3:1: internal compiler error: in assign_by_spills, at
lra-assigns.c:1262
 }
 ^
0x995de3 assign_by_spills
        ../../gcc/lra-assigns.c:1262
0x996a93 lra_assign()
        ../../gcc/lra-assigns.c:1419
0x992d11 lra(_IO_FILE*)
        ../../gcc/lra.c:2308
0x95ae78 do_reload
        ../../gcc/ira.c:4623
0x95ae78 rest_of_handle_reload
        ../../gcc/ira.c:4736
Please submit a full bug report,
with preprocessed source if appropriate.


Same crash after update to r195864.