diff --git a/llvm/include/llvm/Support/Parallel.h b/llvm/include/llvm/Support/Parallel.h
--- a/llvm/include/llvm/Support/Parallel.h
+++ b/llvm/include/llvm/Support/Parallel.h
@@ -18,14 +18,6 @@
 #include <functional>
 #include <mutex>
 
-#if defined(_MSC_VER) && LLVM_ENABLE_THREADS
-#pragma warning(push)
-#pragma warning(disable : 4530)
-#include <concrt.h>
-#include <ppl.h>
-#pragma warning(pop)
-#endif
-
 namespace llvm {
 
 namespace parallel {
@@ -84,23 +76,6 @@
   void sync() const { L.sync(); }
 };
 
-#if defined(_MSC_VER)
-template <class RandomAccessIterator, class Comparator>
-void parallel_sort(RandomAccessIterator Start, RandomAccessIterator End,
-                   const Comparator &Comp) {
-  concurrency::parallel_sort(Start, End, Comp);
-}
-template <class IterTy, class FuncTy>
-void parallel_for_each(IterTy Begin, IterTy End, FuncTy Fn) {
-  concurrency::parallel_for_each(Begin, End, Fn);
-}
-
-template <class IndexTy, class FuncTy>
-void parallel_for_each_n(IndexTy Begin, IndexTy End, FuncTy Fn) {
-  concurrency::parallel_for(Begin, End, Fn);
-}
-
-#else
 const ptrdiff_t MinParallelSize = 1024;
 
 /// Inclusive median.
@@ -188,8 +163,6 @@
 
 #endif
 
-#endif
-
 template <typename Iter>
 using DefComparator =
     std::less<typename std::iterator_traits<Iter>::value_type>;
diff --git a/llvm/lib/Support/Parallel.cpp b/llvm/lib/Support/Parallel.cpp
--- a/llvm/lib/Support/Parallel.cpp
+++ b/llvm/lib/Support/Parallel.cpp
@@ -32,34 +32,6 @@
   static Executor *getDefaultExecutor();
 };
 
-#if defined(_MSC_VER)
-/// An Executor that runs tasks via ConcRT.
-class ConcRTExecutor : public Executor {
-  struct Taskish {
-    Taskish(std::function<void()> Task) : Task(Task) {}
-
-    std::function<void()> Task;
-
-    static void run(void *P) {
-      Taskish *Self = static_cast<Taskish *>(P);
-      Self->Task();
-      concurrency::Free(Self);
-    }
-  };
-
-public:
-  virtual void add(std::function<void()> F) {
-    Concurrency::CurrentScheduler::ScheduleTask(
-        Taskish::run, new (concurrency::Alloc(sizeof(Taskish))) Taskish(F));
-  }
-};
-
-Executor *Executor::getDefaultExecutor() {
-  static ConcRTExecutor exec;
-  return &exec;
-}
-
-#else
 /// An implementation of an Executor that runs closures on a thread pool
 ///   in filo order.
 class ThreadPoolExecutor : public Executor {
@@ -117,8 +89,7 @@
   static ThreadPoolExecutor exec;
   return &exec;
 }
-#endif
-}
+} // namespace
 
 static std::atomic<int> TaskGroupInstances;