http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46590
--- Comment #32 from Steven Bosscher <steven at gcc dot gnu.org> 2012-08-23 13:44:53 UTC --- (In reply to comment #31) > which helps reducing the time spent in computing dominance frontiers. But > as we no longer have bitmaps but bitmap_heads in dfs it's hard to verify > we only ever access dfs for entries we computed ... but we should, > looking at how compute_idf works(?). I don't understand this comment. You can still always do: bitmap_empty_p (&dfs[bb->index]) to see if something was computed for bb.
