[llvm-branch-commits] [llvm] [AMDGPU] Physical register tracking in GCN trackers. (PR #184275)

[Matt Arsenault via llvm-branch-commits]

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@@ -471,6 +493,77 @@ LaneBitmask llvm::getLiveLaneMask(unsigned Reg, SlotIndex SI,
   return getLiveLaneMask(LIS.getInterval(Reg), SI, MRI, LaneMaskFilter);
 }
 
+bool GCNRPTracker::isUnitLiveAt(MCRegUnit Unit, SlotIndex SI) const {
+  const LiveRange *LR = LIS.getCachedRegUnit(Unit);
+  if (!LR)
+    return false;
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arsenm wrote:

If there's no liveness, it probably should conservatively assume it is live? 

https://github.com/llvm/llvm-project/pull/184275