[llvm-branch-commits] [llvm] [AMDGPU] Serialize WWM_REG vreg flag (PR #110229)

[Christudasan Devadasan via llvm-branch-commits]

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@@ -684,8 +684,8 @@ class SIMachineFunctionInfo final : public AMDGPUMachineFunction,
 
   void setFlag(Register Reg, uint8_t Flag) {
     assert(Reg.isVirtual());
-    if (VRegFlags.inBounds(Reg))
-      VRegFlags[Reg] |= Flag;
+    VRegFlags.grow(Reg);
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cdevadas wrote:

This change doesn't make sense to me. What will happen to the regular flow when it reaches from MRI createVirtualRegister? Isn't duplicating the size?
https://github.com/llvm/llvm-project/blob/main/llvm/lib/CodeGen/MachineRegisterInfo.cpp#L166

https://github.com/llvm/llvm-project/pull/110229