[llvm-branch-commits] [llvm] [2/3][AMDGPU] Physical register tracking in GCN trackers. (PR #184275)

[Dhruva Chakrabarti via llvm-branch-commits]

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@@ -596,11 +709,33 @@ void GCNUpwardRPTracker::recede(const MachineInstr &MI) {
     CurPressure.inc(U.VRegOrUnit.asVirtualReg(), PrevMask, LiveMask, *MRI);
   }
 
+  if (TrackPhysRegs) {
+    // Physical register handling needs the register directly to avoid aliasing,
+    // so we need to iterate over all uses.
+    for (const MachineOperand &MO : MI.all_uses()) {
+      if (!MO.isReg() || !MO.getReg().isPhysical() || !MO.readsReg())
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dhruvachak wrote:

Done.

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