================
@@ -2245,6 +2245,36 @@ bool SemaHLSL::CheckBuiltinFunctionCall(unsigned 
BuiltinID, CallExpr *TheCall) {
 
     break;
   }
+  case Builtin::BI__builtin_hlsl_and: {
+    if (SemaRef.checkArgCount(TheCall, 2))
+      return true;
+    if (CheckVectorElementCallArgs(&SemaRef, TheCall))
+      return true;
+
+    // CheckVectorElementCallArgs(...) guarantees both args are the same type.
+    assert(TheCall->getArg(0)->getType() == TheCall->getArg(1)->getType() &&
+           "Both args must be of the same type");
+
+    // check that the arguments are bools or, if vectors,
+    // vectors of bools
+    QualType ArgTy = TheCall->getArg(0)->getType();
+    if (const auto *VecTy = ArgTy->getAs<VectorType>()) {
+      ArgTy = VecTy->getElementType();
+    }
+    if (!getASTContext().hasSameUnqualifiedType(ArgTy,
----------------
llvm-beanz wrote:

> We can talk about it Monday. But as is and builtin will be inconsistent with 
> the errors we are using for all other hls builtins that do this same check.

There are no builtins doing this same check. `and`'s arguments _must_ be bool 
or vector of bool.

There probably is a valid criticism that the diagnostic in the current change 
is less than ideal because it uses the same diagnostic that 
`CheckFloatOrHalfRepresentation` does. Instead it should probably use language 
more like `err_typecheck_expect_scalar_or_vector` to emit a diagnostic that 
clearly denotes parameters should be `bool` or vector of `bool`.

https://github.com/llvm/llvm-project/pull/127098
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