[llvm-dev] [Newbie Question] Compute a schedule region's scheduled cycles.

[陳韋任 via llvm-dev]

Also you might need to check use PostRASchedulerList or
PostMachineScheduler,
PostRASchedulerList is considered deprecated as mentioned in [1].

[1] http://lists.llvm.org/pipermail/llvm-dev/2017-April/112348.html

HTH,
chenwj


2017-06-10 4:03 GMT+08:00 陳韋任 <chenwj.cs97g at g2.nctu.edu.tw>:

> Not saying I am totally understand how thing works, but I think you're
> misleading
> by the DAG in the class name ScheduleDAGInstrs. I only see MachineInstrs
> there, no SDNode. And the comment of ScheduleDAGInstrs says,
>
>   /// A ScheduleDAG for scheduling lists of MachineInstr.
>
> One place mentioning DAG is relate to constructing the dependency of SUnit,
> i.e., Value2SUsMap.
>
> Regards,
> chenwj
>
>
>
> 2017-06-09 23:34 GMT+08:00 Xunhao Li (Alan, CRC) via llvm-dev <
> llvm-dev at lists.llvm.org>:
>
>> Hi All,
>>
>>
>>
>> I am trying to construct a small optimization based on ScheduleDAGInstrs
>> that does the following:
>>
>> 1.      Find candidate nodes in the DAG, and speculatively modify the
>> node (nodes).
>>
>> 2.      After modification, try to compute the scheduled cycles of the
>> region.
>>
>> 3.      If the cycle number improves, go back to 1. to find the next
>> candidate node.
>>
>>
>>
>> I am thinking using SchedulePostRATDList’s top-down algorithm to
>> calculate the cycles needed for the region’s execution. However, it
>> decomposes the schedule DAG while calculating the cycles --- In my case I
>> want to keep the DAG so that we don’t need to construct it again in the
>> following steps.
>>
>>
>>
>> So my question is: is there a way (or API) to calculate the scheduled
>> cycles needed for the region, without touching the DAG? Or is there a
>> better way to do so in a ScheduleDAG? Did I missed something?
>>
>>
>>
>> Thanks in advance. Much appreciated.
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>>
>
>
> --
> Wei-Ren Chen (陳韋任)
> Homepage: https://people.cs.nctu.edu.tw/~chenwj
>



-- 
Wei-Ren Chen (陳韋任)
Homepage: https://people.cs.nctu.edu.tw/~chenwj
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