[atom]: PATCH: reg_mentioned_by_mem_p with DF

[Ye, Joey]

Jakub Jelinek wrote on Monday, March 30, 2009 3:08 PM:
>> Reimplement reg_mentioned_by_mem_p with DF, after Steven's
>> comments.
>> 
>> Thanks - Joey
>> 
>>     * rtlanal.c (reg_mentioned_by_mem_p_1): Removed.
>>     (reg_mentioned_by_mem_p): Re-implement with DF.
>
> As it is used by insn splitter and splitting can also happen during final
> when DF isn't available, I don't see how this is a safe thing to do.
Good question. What's the live range of DF? If its live range can't cover
splitter's, it means this checkin has to be reverted?

Thanks - Joey