[LLVMdev] Passes calling

[Hanbing Li]

Hi, 

I know when a pass needs other passes, it will use something like this: "AU.addRequired<LoopInfo>();". But this is usually used for the analysis passes. 
When a pass needs another transform pass, can it call it automatically? 
For example: 
Some loop optimizations may need loop-simplify, I need add -loop-simplify before calling these passes manually, or they can call the pass -loop-simplify automatically? 


Thank you 
Regards, 

Hanbing LI 
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