[clang] [lld] [llvm] [mlir] [RFC][AMDGPU] Add BARRIER address space (PR #209746)

[Matt Arsenault via cfe-commits]

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@@ -3349,10 +3368,27 @@ bool AMDGPULegalizerInfo::legalizeGlobalValue(
   MachineFunction &MF = B.getMF();
   SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
 
+  if (AS == AMDGPUAS::BARRIER) {
+    const GlobalVariable *GVar = cast<GlobalVariable>(GV);
+    if (!AMDGPU::isNamedBarrier(*GVar)) {
+      const Function &Fn = MF.getFunction();
+      Fn.getContext().diagnose(DiagnosticInfoUnsupported(
+          Fn, "unsupported use of BARRIER address space", MI.getDebugLoc(),
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arsenm wrote:

This could be a more specific error message

https://github.com/llvm/llvm-project/pull/209746