http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51505
--- Comment #5 from Andrey Belevantsev <abel at gcc dot gnu.org> 2012-01-17 16:05:26 UTC --- Created attachment 26353 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26353 untested patch I've tried to implement what Paolo suggests, the attached patch bootstraps but otherwise untested. The code is somewhat ugly as we need to purge all registers reffered to from the note we delete also from EQ_USES list (or we get verification errors). I've never tried to dig deeply in DF core so sorry if the patch is completely in the wrong direction.