[PATCH] D62058: [AMDGPU] gfx1010 Avoid SMEM WAR hazard for some s_waitcnt values

[Carl Ritson via Phabricator via llvm-commits]

critson created this revision.
critson added reviewers: nhaehnle, rampitec.
Herald added subscribers: llvm-commits, t-tye, tpr, dstuttard, yaxunl, wdng, jvesely, kzhuravl, arsenm.
Herald added a project: LLVM.

Avoid introducing hazard mitigation when lgkmcnt is reduced to 0.
Clarify code comments to explain assumptions made for this hazard
mitigation.  Expand and correct test cases to cover variants of
s_waitcnt.


Repository:
  rL LLVM

https://reviews.llvm.org/D62058

Files:
  lib/Target/AMDGPU/GCNHazardRecognizer.cpp
  test/CodeGen/AMDGPU/smem-war-hazard.mir

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