[clang] [AMDGPU] Add sema check for global_atomic_fadd_v2f16 builtin (PR #158145)

[Matt Arsenault via cfe-commits]

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@@ -436,4 +440,32 @@ void SemaAMDGPU::handleAMDGPUMaxNumWorkGroupsAttr(Decl *D,
   addAMDGPUMaxNumWorkGroupsAttr(D, AL, AL.getArgAsExpr(0), YExpr, ZExpr);
 }
 
+
+bool SemaAMDGPU::checkAMDGCNAtomicFaddV2F16Type(CallExpr *TheCall) {
+  // Check that the pointer argument is a pointer to v2f16
+
+  Expr *Arg = TheCall->getArg(1);
+  QualType ArgType = Arg->getType();
+
+  // Check if it's a vector type
+  if (!ArgType->isVectorType()) {
+    Diag(Arg->getBeginLoc(), diag::err_typecheck_call_different_arg_types)
+        << "expected _Float16 vector of length 2" << ArgType
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arsenm wrote:

This shouldn't require a custom message 

https://github.com/llvm/llvm-project/pull/158145