[Bug c/49801] df_live_verify_transfer_functions fails with to use of CC_REGNUM and checking enabled in rx backend

[Paulo.Matos at csr dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49801

--- Comment #1 from Paulo J. Matos <Paulo.Matos at csr dot com> 2011-07-21 09:03:06 UTC ---
I pinpointed this issue to the bitmaps computed in
df_live_verify_transfer_functions (df-problems.c).

bitmap saved_gen has no bit set while bb_info->gen has bit 16 set
(corresponding to the CC reg). Something seems to be confusing function
computing these values but I haven't been able yet to pinpoint the problem.