[PATCH] D69661: [AMDGPU] Fix vccz after v_readlane/v_readfirstlane to vcc_lo/hi

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added inline comments.


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Comment at: llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp:1415
+        VCCZCorrect = false;
+      else if (Inst.definesRegister(AMDGPU::VCC))
+        VCCZCorrect = true;
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Can you just check modifiesRegister(VCC) instead of trying all the subregs?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D69661/new/

https://reviews.llvm.org/D69661