[llvm-dev] Prioritizing an SDNode for scheduling

[Ehsan Amiri via llvm-dev]

I probably misunderstood the question. You probably want to do this in
SelectionDAG.

On Fri, Oct 21, 2016 at 10:29 AM, Ehsan Amiri <ehsanamiri at gmail.com> wrote:

> You can do this by changing instruction scheduling heuristics. I think the
> more important question is if this correct always for all platforms.
>
> I don't know which scheduler you use. We use GenericScheduler and
> PostGenericScheduler before and after RA. These classes have a
> ::tryCandidate method which compares two instructions that can be legally
> scheduled and decide which of the two should be scheduled. Currently these
> method are target independent.
>
> The correctness question still remains open for me.
>
>
> On Thu, Oct 20, 2016 at 8:08 PM, Alex Susu via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>>   Hello.
>>     Is there a way to specify in the back end an (ISD::INLINEASM) SDNode
>> to be scheduled first under all circumstances? I need to specify something
>> like node priority to schedule the node before all other nodes in the
>> SelectionDAG of the basic block.
>>     (Using chain or glue edges in order to make a node first is not a
>> good idea, since I am doing this at instruction selection time, on
>> individual nodes.)
>>
>>   Thank you,
>>     Alex
>> _______________________________________________
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>> llvm-dev at lists.llvm.org
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>>
>
>
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