[clang] [llvm] [AArch64] Implement the atomic store with hint intrinsic (PR #198316)

[via cfe-commits]

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@@ -320,6 +321,94 @@ bool SemaARM::BuiltinARMSpecialReg(unsigned BuiltinID, CallExpr *TheCall,
   return false;
 }
 
+bool SemaARM::BuiltinARMAtomicStoreHintCall(unsigned BuiltinID,
+                                            CallExpr *TheCall) {
+  if (SemaRef.checkArgCount(TheCall, 4))
+    return true;
+
+  // Arg 0 should be the pointer type. The pointee type must be a
+  // scalar integral or floating-point type of 8, 16, 32 or 64 bits.
+  ASTContext &Context = getASTContext();
+  Expr *PtrArg = TheCall->getArg(0);
+  auto PtrArgRes = SemaRef.DefaultFunctionArrayLvalueConversion(PtrArg);
+  if (PtrArgRes.isInvalid())
+    return true;
+  auto *PtrTy = PtrArg->getType()->getAs<PointerType>();
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Lukacma wrote:

I meant we could use PtrArgRes here since we already have it available. I don't think it's going to affect much, but it seems more accurate to me. 

https://github.com/llvm/llvm-project/pull/198316