[LLVMdev] Pass Manager Question

[John Criswell]

Devang Patel wrote:
> On Mar 19, 2009, at 11:43 AM, John Criswell wrote:
>
>   
>> Dear All,
>>
>> If I have a ModulePass that requires a FunctionPass, and I include a
>> line like the following:
>>
>> <variable> = &getAnalysis<TheFunctionPass>(*Function);
>>
>> ... will the PassManager blindly re-run the FunctionPass each time the
>> ModulePass requests it, or does it use the Pass dependency information
>> to re-run the FunctionPass only when necessary.
>>     
>
> Normally the pass manager runs pass only when necessary, but in this  
> special case you mentioned the pass manager will always re-run the  
> function pass.
>   
Thanks everyone.  This helped clarify things.

-- John T.

> -
> Devang
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