On May 13, 2011, at 4:57 PM, Eric Botcazou wrote:
>> 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.
rest_of_pass_free_cfg calls df_analyze but it doesn't call df_note_add_problem.
Is that the issue? I see that some other passes (like regrename) do a
sequence of df_xyz calls.
paul
