[LLVMdev] dynamic passes

[Chuck Zhao]

In this case, you can specialize a few pass manager objects, each for a 
specific sub target type.

E.g.
PassManager pm0 = .. ; // for mips32;
PassManager pm1 = .. ; // for mips16;

...
if(function needs to run on mips32)
   pm0.run();
else
if(function needs to run on mips16)
pm1.run();
...

Of course, you have to figure out the suitable sets of functions for 
each sub target.

Hope it helps.

Chuck

On 3/29/2013 4:28 PM, reed kotler wrote:
> not in this case.
>
> the architecture is changing on a per function pass.
>
> mips32->mips16->mips16....
>
> same issue would be for
>
> arm->thumb1->arm
>
> On 03/29/2013 04:26 PM, Chuck Zhao wrote:
>> Can you do this instead:
>>
>> PassManager pm = ...;
>> pm.add(other needed passes);
>> ...
>> if(arch you are interested)
>>   pm.add(your pass);
>> ...
>> pm.run();
>>
>>
>> Chuck
>>
>>
>> On 3/29/2013 4:15 PM, Reed Kotler wrote:
>>> This is what I'm doing right now and the only issues that came up in 
>>> internal review is that we have to create the pass object now for 
>>> things
>>> that we are unlikely to need.
>>>
>>> On 03/29/2013 04:05 PM, Chuck Zhao wrote:
>>>> I think you will have to add the passes anyway before asking the pass
>>>> manager object to run.
>>>> In addition, you can specify some dependency, so that that non 
>>>> relevant
>>>> pass will not have a chance to run. The PassManager should be able to
>>>> figure that out given the runtime conditions.
>>>>
>>>> Chuck
>>>>
>>>> On 3/29/2013 3:38 PM, reed kotler wrote:
>>>>> Is it possible to dynamically add and remove passes once llc 
>>>>> starts to
>>>>> run?
>>>>>
>>>>> Currently I have to add some machine function passes and only once
>>>>> they are running, I have them return right away because they are not
>>>>> relevant at that time. For example, mips16 does not use the delay 
>>>>> slot
>>>>> optimizer but now I would need to add the pass all the time just in
>>>>> case someone specified that a particular function be compiled as 
>>>>> mips32.
>>>>>
>>>>> It seems from the pass manager that you can add and subtract passes
>>>>> but I was unclear as to whether this was something you have to do
>>>>> before the pass manager starts to run passes.
>>>>>
>>>>> Tia.
>>>>>
>>>>> Reed
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> LLVM Developers mailing list
>>>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>>>
>>>
>>>
>>>
>>
>
>
>