[clang] [llvm] [AArch64] Add __hvc, __svc and _InterlockedCompareExchangePointer_nf MS intrinsics (PR #202582)

[Eli Friedman via cfe-commits]

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@@ -5263,6 +5263,18 @@ Value *CodeGenFunction::EmitAArch64BuiltinExpr(unsigned BuiltinID,
     return ConstantInt::get(Builder.getInt32Ty(), 0);
   }
 
+  if (BuiltinID == AArch64::BI__hvc) {
+    Function *F = CGM.getIntrinsic(Intrinsic::aarch64_hvc);
+    Builder.CreateCall(F, {EmitScalarExpr(E->getArg(0))});
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efriedma-quic wrote:

If it's easier, maybe consider making clang generate inline asm.  I don't really want to think about the mechanics of an intrinsic with a variable number of arguments, and the optimizer can't do anything interesting with the intrinsic anyway.

https://github.com/llvm/llvm-project/pull/202582