diff --git a/include/llvm/CompilerDriver/Common.td b/include/llvm/CompilerDriver/Common.td
index 914249e7d90..2ea1f4a3f0c 100644
--- a/include/llvm/CompilerDriver/Common.td
+++ b/include/llvm/CompilerDriver/Common.td
@@ -59,6 +59,7 @@ def false;
 // Boolean operators.
 def and;
 def or;
+def not;
 
 // Primitive tests.
 def switch_on;
diff --git a/utils/TableGen/LLVMCConfigurationEmitter.cpp b/utils/TableGen/LLVMCConfigurationEmitter.cpp
index 6bade9bc6e4..8a5b36acd58 100644
--- a/utils/TableGen/LLVMCConfigurationEmitter.cpp
+++ b/utils/TableGen/LLVMCConfigurationEmitter.cpp
@@ -1074,6 +1074,16 @@ void EmitLogicalOperationTest(const DagInit& d, const char* LogicOp,
   }
 }
 
+void EmitLogicalNot(const DagInit& d, const char* IndentLevel,
+                    const OptionDescriptions& OptDescs, raw_ostream& O)
+{
+  checkNumberOfArguments(&d, 1);
+  const DagInit& InnerTest = InitPtrToDag(d.getArg(0));
+  O << "! (";
+  EmitCaseTest(InnerTest, IndentLevel, OptDescs, O);
+  O << ")";
+}
+
 /// EmitCaseTest - Helper function used by EmitCaseConstructHandler.
 void EmitCaseTest(const DagInit& d, const char* IndentLevel,
                   const OptionDescriptions& OptDescs,
@@ -1084,6 +1094,8 @@ void EmitCaseTest(const DagInit& d, const char* IndentLevel,
     EmitLogicalOperationTest(d, "&&", IndentLevel, OptDescs, O);
   else if (TestName == "or")
     EmitLogicalOperationTest(d, "||", IndentLevel, OptDescs, O);
+  else if (TestName == "not")
+    EmitLogicalNot(d, IndentLevel, OptDescs, O);
   else if (EmitCaseTest1Arg(TestName, d, OptDescs, O))
     return;
   else if (EmitCaseTest2Args(TestName, d, IndentLevel, OptDescs, O))