[PATCH] D156679: [WIP][AMDGPU][SIInsertWaitcnts] Do not add s_waitcnt when the counters are known to be 0 already

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

> I'm currently trying to find a way to distinguish between waitcnt instructions coming from the memory-legalizer and the rest.
> But I'm far less familiar with the MachineInstruction API than with LLVM-IR.
> Is there something like Metadata or Flags that we can turn on/off to indiciate that an instruction is coming from the legalizer?

I think you should probably use different opcodes for this, e.g. invent something like S_SOFT_WAITCNT or S_WAITCNT_PSEUDO for the ones inserted by SIMemoryLegalizer.


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  https://reviews.llvm.org/D156679/new/

https://reviews.llvm.org/D156679