[LLVMdev] How to disable pass grouping(scheduling)
John Criswell
criswell at illinois.edu
Wed Jun 29 09:44:39 PDT 2011
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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>>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
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>>
>>
>
>
>
>
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