diff --git a/include/llvm/ADT/StringMap.h b/include/llvm/ADT/StringMap.h
index ecac5dd5f66..5b186818798 100644
--- a/include/llvm/ADT/StringMap.h
+++ b/include/llvm/ADT/StringMap.h
@@ -139,10 +139,10 @@ public:
   /// Create - Create a StringMapEntry for the specified key and default
   /// construct the value.
   template<typename AllocatorTy, typename InitType>
-  static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd,
+  static StringMapEntry *Create(StringRef Key,
                                 AllocatorTy &Allocator,
                                 InitType InitVal) {
-    unsigned KeyLength = static_cast<unsigned>(KeyEnd-KeyStart);
+    unsigned KeyLength = Key.size();
 
     // Allocate a new item with space for the string at the end and a null
     // terminator.
@@ -158,27 +158,25 @@ public:
 
     // Copy the string information.
     char *StrBuffer = const_cast<char*>(NewItem->getKeyData());
-    memcpy(StrBuffer, KeyStart, KeyLength);
+    memcpy(StrBuffer, Key.data(), KeyLength);
     StrBuffer[KeyLength] = 0;  // Null terminate for convenience of clients.
     return NewItem;
   }
 
   template<typename AllocatorTy>
-  static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd,
-                                AllocatorTy &Allocator) {
-    return Create(KeyStart, KeyEnd, Allocator, 0);
+  static StringMapEntry *Create(StringRef Key, AllocatorTy &Allocator) {
+    return Create(Key, Allocator, ValueTy());
   }
 
   /// Create - Create a StringMapEntry with normal malloc/free.
   template<typename InitType>
-  static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd,
-                                InitType InitVal) {
+  static StringMapEntry *Create(StringRef Key, InitType InitVal) {
     MallocAllocator A;
-    return Create(KeyStart, KeyEnd, A, std::move(InitVal));
+    return Create(Key, A, std::move(InitVal));
   }
 
-  static StringMapEntry *Create(const char *KeyStart, const char *KeyEnd) {
-    return Create(KeyStart, KeyEnd, ValueTy());
+  static StringMapEntry *Create(StringRef Key) {
+    return Create(Key, ValueTy());
   }
 
   /// GetStringMapEntryFromValue - Given a value that is known to be embedded
@@ -353,8 +351,7 @@ public:
     if (Bucket && Bucket != getTombstoneVal())
       return *static_cast<MapEntryTy*>(Bucket);
 
-    MapEntryTy *NewItem =
-        MapEntryTy::Create(Key.begin(), Key.end(), Allocator, std::move(Val));
+    MapEntryTy *NewItem = MapEntryTy::Create(Key, Allocator, std::move(Val));
 
     if (Bucket == getTombstoneVal())
       --NumTombstones;
diff --git a/lib/IR/Value.cpp b/lib/IR/Value.cpp
index f392512c3e9..463024a28c7 100644
--- a/lib/IR/Value.cpp
+++ b/lib/IR/Value.cpp
@@ -213,7 +213,7 @@ void Value::setName(const Twine &NewName) {
     // then reallocated.
 
     // Create the new name.
-    Name = ValueName::Create(NameRef.begin(), NameRef.end());
+    Name = ValueName::Create(NameRef);
     Name->setValue(this);
     return;
   }
diff --git a/lib/Support/StringPool.cpp b/lib/Support/StringPool.cpp
index ff607cf8c4a..76faabc92bb 100644
--- a/lib/Support/StringPool.cpp
+++ b/lib/Support/StringPool.cpp
@@ -27,7 +27,7 @@ PooledStringPtr StringPool::intern(StringRef Key) {
   if (I != InternTable.end())
     return PooledStringPtr(&*I);
   
-  entry_t *S = entry_t::Create(Key.begin(), Key.end());
+  entry_t *S = entry_t::Create(Key);
   S->getValue().Pool = this;
   InternTable.insert(S);
   
diff --git a/unittests/ADT/StringMapTest.cpp b/unittests/ADT/StringMapTest.cpp
index de18e07f386..70eec873ed2 100644
--- a/unittests/ADT/StringMapTest.cpp
+++ b/unittests/ADT/StringMapTest.cpp
@@ -187,7 +187,7 @@ TEST_F(StringMapTest, IterationTest) {
 TEST_F(StringMapTest, StringMapEntryTest) {
   StringMap<uint32_t>::value_type* entry =
       StringMap<uint32_t>::value_type::Create(
-          testKeyFirst, testKeyFirst + testKeyLength, 1u);
+          StringRef(testKeyFirst, testKeyLength), 1u);
   EXPECT_STREQ(testKey, entry->first().data());
   EXPECT_EQ(1u, entry->second);
   free(entry);
@@ -198,7 +198,7 @@ TEST_F(StringMapTest, InsertTest) {
   SCOPED_TRACE("InsertTest");
   testMap.insert(
       StringMap<uint32_t>::value_type::Create(
-          testKeyFirst, testKeyFirst + testKeyLength, 
+          StringRef(testKeyFirst, testKeyLength),
           testMap.getAllocator(), 1u));
   assertSingleItemMap();
 }
@@ -236,7 +236,7 @@ TEST_F(StringMapTest, MoveOnlyKey) {
   StringMap<MoveOnly> t;
   t.GetOrCreateValue("Test", MoveOnly(42));
   StringRef Key = "Test";
-  StringMapEntry<MoveOnly>::Create(Key.begin(), Key.end(), MoveOnly(42))
+  StringMapEntry<MoveOnly>::Create(Key, MoveOnly(42))
       ->Destroy();
 }