[PATCH] D40183: [AMDGPU] Waitcnt pass. Add S_WAITCNT 0 if incomplete predecessor info

[Mark Searles via Phabricator via llvm-commits]

msearles created this revision.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, kzhuravl.

When merging waitcnt info from preds, add a S_WAITCNT 0 at the top of a block if a pred has not yet been visited (so incomplete info re: preds) and we're sure that we will not revisit the block.


https://reviews.llvm.org/D40183

Files:
  lib/Target/AMDGPU/SIInsertWaitcnts.cpp
  test/CodeGen/AMDGPU/waitcnt-no-preds.ll

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