> Question: that code doesn't appear to touch REG_DEAD notes at all. Is that > right? From the definition of REG_DEAD, it seems that rewriting a later > insns to use register x means that a preceding (REG_DEAD x) needs to be > deleted. Or moved to the later insn, perhaps.
If the pass doesn't consume REG_DEAD/REG_UNUSED notes, it doesn't have to keep them up-to-date. Instead, passes that consume them must df_note_add_problem() on entry. For the generic reorg (delay slot filling) pass, this is done in rest_of_pass_free_cfg. -- Eric Botcazou
