[llvm-branch-commits] [clang] clang/AMDGPU: Set noalias.addrspace metadata on atomicrmw (PR #102462)

[Matt Arsenault via llvm-branch-commits]

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@@ -550,6 +551,16 @@ AMDGPUTargetCodeGenInfo::getLLVMSyncScopeID(const LangOptions &LangOpts,
 
 void AMDGPUTargetCodeGenInfo::setTargetAtomicMetadata(
     CodeGenFunction &CGF, llvm::AtomicRMWInst &RMW) const {
+
+  if (RMW.getPointerAddressSpace() == llvm::AMDGPUAS::FLAT_ADDRESS &&
+      CGF.CGM.getLangOpts().threadPrivateMemoryAtomicsAreUndefined()) {
+    llvm::MDBuilder MDHelper(CGF.getLLVMContext());
+    llvm::MDNode *ASRange = MDHelper.createRange(
+        llvm::APInt(32, llvm::AMDGPUAS::PRIVATE_ADDRESS),
+        llvm::APInt(32, llvm::AMDGPUAS::PRIVATE_ADDRESS + 1));
+    RMW.setMetadata(llvm::LLVMContext::MD_noalias_addrspace, ASRange);
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arsenm wrote:

It's defined in the parent PR #102461. I haven't posted the patch to use it yet, but the primary use is the AtomicExpand hooks 

https://github.com/llvm/llvm-project/pull/102462