diff --git a/llvm/lib/Analysis/IPA/CallGraph.cpp b/llvm/lib/Analysis/IPA/CallGraph.cpp
index caec2534691a..dfabb0ad063d 100644
--- a/llvm/lib/Analysis/IPA/CallGraph.cpp
+++ b/llvm/lib/Analysis/IPA/CallGraph.cpp
@@ -267,7 +267,7 @@ INITIALIZE_PASS(CallGraphWrapperPass, "basiccg", "CallGraph Construction",
 
 char CallGraphWrapperPass::ID = 0;
 
-void CallGraphWrapperPass::releaseMemory() { G.reset(nullptr); }
+void CallGraphWrapperPass::releaseMemory() { G.reset(); }
 
 void CallGraphWrapperPass::print(raw_ostream &OS, const Module *) const {
   if (!G) {
diff --git a/llvm/lib/CodeGen/RegAllocBasic.cpp b/llvm/lib/CodeGen/RegAllocBasic.cpp
index b722098c5c75..6bc678e85211 100644
--- a/llvm/lib/CodeGen/RegAllocBasic.cpp
+++ b/llvm/lib/CodeGen/RegAllocBasic.cpp
@@ -157,7 +157,7 @@ void RABasic::getAnalysisUsage(AnalysisUsage &AU) const {
 }
 
 void RABasic::releaseMemory() {
-  SpillerInstance.reset(nullptr);
+  SpillerInstance.reset();
 }
 
 
diff --git a/llvm/lib/CodeGen/RegAllocGreedy.cpp b/llvm/lib/CodeGen/RegAllocGreedy.cpp
index 901b993eea80..dee990c2eb5f 100644
--- a/llvm/lib/CodeGen/RegAllocGreedy.cpp
+++ b/llvm/lib/CodeGen/RegAllocGreedy.cpp
@@ -486,7 +486,7 @@ void RAGreedy::LRE_DidCloneVirtReg(unsigned New, unsigned Old) {
 }
 
 void RAGreedy::releaseMemory() {
-  SpillerInstance.reset(nullptr);
+  SpillerInstance.reset();
   ExtraRegInfo.clear();
   GlobalCand.clear();
 }
diff --git a/llvm/lib/Support/FileOutputBuffer.cpp b/llvm/lib/Support/FileOutputBuffer.cpp
index 2e740ca04518..94bcdc58a806 100644
--- a/llvm/lib/Support/FileOutputBuffer.cpp
+++ b/llvm/lib/Support/FileOutputBuffer.cpp
@@ -87,7 +87,7 @@ FileOutputBuffer::create(StringRef FilePath, size_t Size,
 
 std::error_code FileOutputBuffer::commit(int64_t NewSmallerSize) {
   // Unmap buffer, letting OS flush dirty pages to file on disk.
-  Region.reset(nullptr);
+  Region.reset();
 
   // If requested, resize file as part of commit.
   if ( NewSmallerSize != -1 ) {
diff --git a/llvm/utils/TableGen/DAGISelMatcherOpt.cpp b/llvm/utils/TableGen/DAGISelMatcherOpt.cpp
index 0b117eb37c9c..da6a9577a770 100644
--- a/llvm/utils/TableGen/DAGISelMatcherOpt.cpp
+++ b/llvm/utils/TableGen/DAGISelMatcherOpt.cpp
@@ -400,7 +400,7 @@ static void FactorNodes(std::unique_ptr<Matcher> &MatcherPtr) {
   }
   
   if (NewOptionsToMatch.empty()) {
-    MatcherPtr.reset(nullptr);
+    MatcherPtr.reset();
     return;
   }