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

[Matt Arsenault via llvm-branch-commits]

================
@@ -3839,3 +3839,14 @@ SIRegisterInfo::getSubRegAlignmentNumBits(const 
TargetRegisterClass *RC,
   }
   return 0;
 }
+
+SmallVector<SmallString<8>>
+SIRegisterInfo::getVRegFlagsOfReg(Register Reg,
+                                  const MachineFunction &MF) const {
+  SmallVector<SmallString<8>> RegFlags;
+  const SIMachineFunctionInfo *FuncInfo = MF.getInfo<SIMachineFunctionInfo>();
+  if (FuncInfo->checkFlag(Reg, AMDGPU::VirtRegFlag::WWM_REG)) {
+    RegFlags.push_back(SmallString<8>("WWM_REG"));
+  }
----------------
arsenm wrote:

I mean the interface could change from SmallString to StringLiteral 

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