[LLVMdev] How to disable pass grouping(scheduling)

[John Criswell]

On 6/29/11 11:33 AM, kecheng at cecs.pdx.edu wrote:
> Thanks John, this is an easy way to achieve this goal, but I'm 
> wondering if this is the only way? I have around 100 passes.

You might be able to do this by writing a program that uses multiple 
Pass Manager objects to run the passes, but I'm not sure if that will 
work; perhaps someone more knowledgeable on PassManager internals can 
comment.

Just out of curiosity, why are you trying to do this?  The 
doInitialization() and doFinalization() methods, I believe, are 
typically used for some global setup/cleanup for a FunctionPass (e.g., 
to add a function declaration so that the FunctionPass can add calls to 
that function); as such, they usually don't do much, and their relative 
order of execution shouldn't really matter.

-- John T.
>
> Quoting John Criswell <criswell at illinois.edu>:
>
>> On 6/28/11 11:35 PM, kecheng at cecs.pdx.edu wrote:
>>> Hi all,
>>>
>>> Llvm can automatically group a list passes. I want to do some
>>> experiment to see the difference between grouping and non-grouping
>>> execution.
>>> Considering the following example, if I want to apply transformation
>>> A, B and C. The execution order is:
>>>    A.doInitialization();
>>>    B.doInitialization();
>>>    C.doInitialization();
>>>    A.runOnFunction();
>>>    B.runOnFunction();
>>>    C.runOnFunction();
>>>    A.doInitialization();
>>>    B.doInitialization();
>>>    C.doInitialization();
>>>
>>> Is it possible to disable the grouping? Make it execute as:
>>>
>>>    A.doInitialization();
>>>    A.runOnFunction();
>>>    A.doInitialization();
>>>    B.doInitialization();
>>>    B.runOnFunction();
>>>    B.doInitialization();
>>>    C.doInitialization();
>>>    C.runOnFunction();
>>>    C.doInitialization();
>>>
>>> Thanks,
>>
>> You can run opt three times (one for each pass A, B, and C), piping 
>> them together so that the output of one is the input to the next.
>>
>> -- John T.
>>
>>> Kecheng
>>>
>>>
>>>
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>>
>>
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