[clang] [aarch64] Add more MSVC intrinsics (PR #194632)

[Adhemerval Zanella via cfe-commits]

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@@ -5244,6 +5293,26 @@ Value *CodeGenFunction::EmitAArch64BuiltinExpr(unsigned BuiltinID,
     return Builder.CreateCall(F, {Address, RW, Locality, Data});
   }
 
+  if (BuiltinID == AArch64::BI__prefetch2) {
+    Value *Address = EmitScalarExpr(E->getArg(0));
+    llvm::APSInt PrfOp = E->getArg(1)->EvaluateKnownConstInt(CGM.getContext());
+    // Decode 5-bit PRFM encoding: bits[4:3]=type, bits[2:1]=target,
+    // bit[0]=policy
+    //   type: PLD=0(load), PLI=1(instr), PST=2(store)
+    //   target: L1=0, L2=1, L3=2
+    //   policy: KEEP=0, STRM=1
+    uint64_t Op = PrfOp.getZExtValue();
+    uint64_t Type = (Op >> 3) & 0x3;
+    uint64_t Target = (Op >> 1) & 0x3;
+    uint64_t Policy = Op & 0x1;
+    Value *RW = ConstantInt::get(Int32Ty, Type == 2 ? 1 : 0);
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zatrazz wrote:

Ack.

https://github.com/llvm/llvm-project/pull/194632