1 files changed, 14 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 3e0e9bb..dca9d6e 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -15944,6 +15944,20 @@ ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
             return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
                              << resultType << Input.get()->getSourceRange());
         }
+      } else if (Context.getLangOpts().HLSL && resultType->isVectorType() &&
+                 !resultType->hasBooleanRepresentation()) {
+        // HLSL unary logical 'not' behaves like C++, which states that the
+        // operand is converted to bool and the result is bool, however HLSL
+        // extends this property to vectors.
+        const VectorType *VTy = resultType->castAs<VectorType>();
+        resultType =
+            Context.getExtVectorType(Context.BoolTy, VTy->getNumElements());
+
+        Input = ImpCastExprToType(
+                    Input.get(), resultType,
+                    ScalarTypeToBooleanCastKind(VTy->getElementType()))
+                    .get();
+        break;
       } else if (resultType->isExtVectorType()) {
         if (Context.getLangOpts().OpenCL &&
             Context.getLangOpts().getOpenCLCompatibleVersion() < 120) {