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

[rth at gcc dot gnu.org]

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

Richard Henderson <rth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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  Attachment #25430|0                           |1
        is obsolete|                            |
             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at gcc dot       |rth at gcc dot gnu.org
                   |gnu.org                     |

--- Comment #7 from Richard Henderson <rth at gcc dot gnu.org> 2011-10-06 
21:59:22 UTC ---
Created attachment 25435
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25435
workaround for live-register update

I think this patch proves I have no idea how the df interfaces work.
In particular, why the call to df_analyze is required *after* doing
the work.  Seems like for a simple problem like liveness, this ought
to be kept up-to-date without extra help...