[clang] [llvm] Adding splitdouble HLSL function (PR #109331)

[Chris B via cfe-commits]

================
@@ -1992,6 +2001,37 @@ bool SemaHLSL::CheckBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
       return true;
     break;
   }
+  case Builtin::BI__builtin_hlsl_splitdouble: {
+    if (SemaRef.checkArgCount(TheCall, 3))
+      return true;
+
+    Expr *Op0 = TheCall->getArg(0);
+
+    auto CheckIsNotDouble = [](clang::QualType PassedType) -> bool {
+      return !PassedType->hasFloatingRepresentation();
+    };
+
+    if (CheckArgTypeIsIncorrect(&SemaRef, Op0, SemaRef.Context.DoubleTy,
+                                CheckIsNotDouble)) {
+      return true;
+    }
----------------
llvm-beanz wrote:

nit: https://llvm.org/docs/CodingStandards.html#don-t-use-braces-on-simple-single-statement-bodies-of-if-else-loop-statements

https://github.com/llvm/llvm-project/pull/109331