[llvm-branch-commits] [llvm] [AMDGPU] Implement "non-av" semantics using metadata (PR #199489)

[Fabian Ritter via llvm-branch-commits]

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@@ -733,6 +737,13 @@ getSynchronizeAddrSpaceMD(const MachineInstr &MI) {
   return Result;
 }
 
+static bool hasAVNoneMMRA(const MachineInstr &MI) {
+  auto MMRA = MMRAMetadata(MI.getMMRAMetadata());
+  if (!MMRA)
+    return false;
+  return MMRA.hasTag("amdgcn-av", "none");
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ritter-x2a wrote:

Also: should we diagnose values other than `"none"`? There is no case where we want to make use of the happens-before-breaking semantics of incompatible MMRAs, right?

https://github.com/llvm/llvm-project/pull/199489