------- Comment #17 from steven at gcc dot gnu dot org 2010-01-28 18:05 ------- How does this address the 30ish calls to df_set_bb_dirty from the rest of the compiler? See cfgcleanup, cfgrtl, emit-rtl, ifcvt, and modulo-sched. Each of them could result in a DCE run if someone adds DF_LR_RUN_DCE. At least in ifcvt we already have this problem even now (i.e. directly from ifcvt.c). The others could trigger a DCE run via one of the CFG manipulation functions in cfg* and emit-rtl.
-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42889
