================
@@ -205,8 +205,13 @@ BitVector HexagonRegisterInfo::getReservedRegs(const 
MachineFunction &MF)
   for (auto Reg : Hexagon_MC::GetVectRegRev())
     Reserved.set(Reg);
 
-  if (MF.getSubtarget<HexagonSubtarget>().hasReservedR19())
-    Reserved.set(Hexagon::R19);
+  static const MCPhysReg RRegs[] = {
----------------
quic-santdas wrote:

MCPhysReg has lesser storage requirements vs Register class. The LLVM 
convention is that for static tables with known physical registers, we use 
MCPhysReg. Functionally they should be same.

https://github.com/llvm/llvm-project/pull/197208
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