[LLVMdev] How to disable pass grouping(scheduling)

[Michael Ilseman]

You could also use the API, e.g.

RunPass(Pass* p) {
  PassManager pm;
  pm.add(p);
  pm.run(M)
}

...
RunPass(createAPass());
RunPass(createBPass());
RunPass(createCPass());
...

Is your goal just to see the performance lost from having to recompute
analyses that would otherwise be preserved and reused?


On Wed, Jun 29, 2011 at 10:33 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.
>
> 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
>>>
>>>
>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>>
>
>
>
>
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