[Bug target/63502] ICE in s390_add_constant when building with g++ in S390x Linux

["bill.klees at teamquest dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63502

--- Comment #1 from Bill Klees <bill.klees at teamquest dot com> ---
Setting breakpoint at s390_add_constant

Breakpoint 5, s390_add_constant (pool=0x80da0880, val=0x20003889cc0,
mode=BLKmod
    at /home/bjk/gcc/gcc-4.9.1/./gcc/config/s390/s390.c:6400
6400      for (i = 0; i < NR_C_MODES; i++)
(gdb) list
6395    s390_add_constant (struct constant_pool *pool, rtx val, enum
machine_mode mode)
6396    {
6397      struct constant *c;
6398      int i;
6399
6400      for (i = 0; i < NR_C_MODES; i++)
6401        if (constant_modes[i] == mode)
6402          break;
6403      gcc_assert (i != NR_C_MODES);
6404
(gdb) print constant_modes
$4 = {TFmode, TImode, TDmode, DFmode, DImode, DDmode, SFmode, SImode, SDmode,
HImode, QImode}
(gdb) print mode
$5 = BLKmode
(gdb)

Failure occurs on the assert since BLKmode is not in the list.