Index: clang/lib/CodeGen/CGOpenMPRuntime.cpp
===================================================================
--- clang/lib/CodeGen/CGOpenMPRuntime.cpp
+++ clang/lib/CodeGen/CGOpenMPRuntime.cpp
@@ -3871,11 +3871,16 @@
 
 void CGOpenMPRuntime::emitFlush(CodeGenFunction &CGF, ArrayRef<const Expr *>,
                                 SourceLocation Loc) {
-  if (!CGF.HaveInsertPoint())
-    return;
-  // Build call void __kmpc_flush(ident_t *loc)
-  CGF.EmitRuntimeCall(createRuntimeFunction(OMPRTL__kmpc_flush),
-                      emitUpdateLocation(CGF, Loc));
+  llvm::OpenMPIRBuilder *OMPBuilder = CGF.CGM.getOpenMPIRBuilder();
+  if (OMPBuilder) {
+    OMPBuilder->CreateFlush(CGF.Builder);
+  } else {
+    if (!CGF.HaveInsertPoint())
+      return;
+    // Build call void __kmpc_flush(ident_t *loc)
+    CGF.EmitRuntimeCall(createRuntimeFunction(OMPRTL__kmpc_flush),
+                        emitUpdateLocation(CGF, Loc));
+  }
 }
 
 namespace {
Index: clang/test/OpenMP/flush_codegen.cpp
===================================================================
--- clang/test/OpenMP/flush_codegen.cpp
+++ clang/test/OpenMP/flush_codegen.cpp
@@ -1,6 +1,9 @@
 // RUN: %clang_cc1 -verify -fopenmp -x c++ -emit-llvm %s -fexceptions -fcxx-exceptions -o - | FileCheck %s
 // RUN: %clang_cc1 -fopenmp -x c++ -std=c++11 -triple x86_64-unknown-unknown -fexceptions -fcxx-exceptions -emit-pch -o %t %s
 // RUN: %clang_cc1 -fopenmp -x c++ -triple x86_64-unknown-unknown -fexceptions -fcxx-exceptions -debug-info-kind=limited -std=c++11 -include-pch %t -verify %s -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 -verify -fopenmp -fopenmp-enable-irbuilder -x c++ -emit-llvm %s -fexceptions -fcxx-exceptions -o - | FileCheck %s
+// RUN: %clang_cc1 -fopenmp -fopenmp-enable-irbuilder -x c++ -std=c++11 -triple x86_64-unknown-unknown -fexceptions -fcxx-exceptions -emit-pch -o %t %s
+// RUN: %clang_cc1 -fopenmp -fopenmp-enable-irbuilder -x c++ -triple x86_64-unknown-unknown -fexceptions -fcxx-exceptions -debug-info-kind=limited -std=c++11 -include-pch %t -verify %s -emit-llvm -o - | FileCheck %s
 
 // RUN: %clang_cc1 -verify -fopenmp-simd -x c++ -emit-llvm %s -fexceptions -fcxx-exceptions -o - | FileCheck --check-prefix SIMD-ONLY0 %s
 // RUN: %clang_cc1 -fopenmp-simd -x c++ -std=c++11 -triple x86_64-unknown-unknown -fexceptions -fcxx-exceptions -emit-pch -o %t %s
Index: llvm/include/llvm/Frontend/OpenMPKinds.def
===================================================================
--- llvm/include/llvm/Frontend/OpenMPKinds.def
+++ llvm/include/llvm/Frontend/OpenMPKinds.def
@@ -164,6 +164,7 @@
 
 __OMP_RTL(__kmpc_barrier, false, Void, IdentPtr, Int32)
 __OMP_RTL(__kmpc_cancel_barrier, false, Int32, IdentPtr, Int32)
+__OMP_RTL(__kmpc_flush, false, Void, IdentPtr)
 __OMP_RTL(__kmpc_global_thread_num, false, Int32, IdentPtr)
 __OMP_RTL(__kmpc_fork_call, true, Void, IdentPtr, Int32, ParallelTaskPtr)
 __OMP_RTL(omp_get_thread_num, false, Int32, )
Index: llvm/include/llvm/Transforms/Utils/OpenMPIRBuilder.h
===================================================================
--- llvm/include/llvm/Transforms/Utils/OpenMPIRBuilder.h
+++ llvm/include/llvm/Transforms/Utils/OpenMPIRBuilder.h
@@ -75,6 +75,12 @@
 
   ///}
 
+  /// Generator for '#omp flush'
+  ///
+  /// \param Loc The location where the flush directive was encountered
+  void CreateFlush(const LocationDescription &Loc);
+
+
 private:
   /// Update the internal location to \p Loc.
   bool updateToLocation(const LocationDescription &Loc) {
@@ -112,6 +118,11 @@
                                 omp::Directive DK, bool ForceSimpleCall,
                                 bool CheckCancelFlag);
 
+  /// Generate a flush runtime call.
+  ///
+  /// \param Loc The location at which the request originated and is fulfilled.
+  void emitFlush(const LocationDescription &Loc);
+
   /// Return the current thread ID.
   ///
   /// \param Ident The ident (ident_t*) describing the query origin.
Index: llvm/lib/Frontend/OpenMPIRBuilder.cpp
===================================================================
--- llvm/lib/Frontend/OpenMPIRBuilder.cpp
+++ llvm/lib/Frontend/OpenMPIRBuilder.cpp
@@ -243,3 +243,19 @@
 
   return Builder.saveIP();
 }
+
+void OpenMPIRBuilder::emitFlush(const LocationDescription &Loc)
+{
+  // Build call void __kmpc_flush(ident_t *loc)
+  Constant *SrcLocStr = getOrCreateSrcLocStr(Loc);
+  Value *Args[] = {getOrCreateIdent(SrcLocStr)};
+
+  Builder.CreateCall(getOrCreateRuntimeFunction(OMPRTL___kmpc_flush), Args);
+}
+
+void OpenMPIRBuilder::CreateFlush(const LocationDescription &Loc)
+{
+  if (!updateToLocation(Loc))
+   return;
+  emitFlush(Loc);
+}