Index: llvm/include/llvm/ADT/APFloat.h
===================================================================
--- llvm/include/llvm/ADT/APFloat.h
+++ llvm/include/llvm/ADT/APFloat.h
@@ -851,6 +851,9 @@
   APFloat(const fltSemantics &Semantics) : U(Semantics) {}
   APFloat(const fltSemantics &Semantics, StringRef S);
   APFloat(const fltSemantics &Semantics, integerPart I) : U(Semantics, I) {}
+  template <typename T, typename = typename std::enable_if<
+                            std::is_floating_point<T>::value>::type>
+  APFloat(const fltSemantics &Semantics, T V) = delete;
   // TODO: Remove this constructor. This isn't faster than the first one.
   APFloat(const fltSemantics &Semantics, uninitializedTag)
       : U(Semantics, uninitialized) {}
Index: llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -3358,7 +3358,7 @@
 
     if (const ConstantFP *C = dyn_cast<ConstantFP>(Src)) {
       const APFloat &ArgVal = C->getValueAPF();
-      APFloat Val(ArgVal.getSemantics(), 1.0);
+      APFloat Val(ArgVal.getSemantics(), 1);
       APFloat::opStatus Status = Val.divide(ArgVal,
                                             APFloat::rmNearestTiesToEven);
       // Only do this if it was exact and therefore not dependent on the
Index: llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
===================================================================
--- llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -1696,7 +1696,7 @@
     // TODO: This whole transformation should be backend specific (e.g. some
     //       backends might prefer libcalls or the limit for the exponent might
     //       be different) and it should also consider optimizing for size.
-    APFloat LimF(ExpoF->getSemantics(), 33.0),
+    APFloat LimF(ExpoF->getSemantics(), 33),
             ExpoA(abs(*ExpoF));
     if (ExpoA.compare(LimF) == APFloat::cmpLessThan) {
       // This transformation applies to integer or integer+0.5 exponents only.
Index: llvm/unittests/ADT/APFloatTest.cpp
===================================================================
--- llvm/unittests/ADT/APFloatTest.cpp
+++ llvm/unittests/ADT/APFloatTest.cpp
@@ -520,9 +520,9 @@
 
   // Test x87 extended precision case from http://llvm.org/PR20728.
   {
-    APFloat M1(APFloat::x87DoubleExtended(), 1.0);
-    APFloat M2(APFloat::x87DoubleExtended(), 1.0);
-    APFloat A(APFloat::x87DoubleExtended(), 3.0);
+    APFloat M1(APFloat::x87DoubleExtended(), 1);
+    APFloat M2(APFloat::x87DoubleExtended(), 1);
+    APFloat A(APFloat::x87DoubleExtended(), 3);
 
     bool losesInfo = false;
     M1.fusedMultiplyAdd(M1, A, APFloat::rmNearestTiesToEven);
@@ -591,9 +591,9 @@
   {
     const char *MinNormalStr = "1.17549435082228750797e-38";
     EXPECT_FALSE(APFloat(APFloat::IEEEsingle(), MinNormalStr).isDenormal());
-    EXPECT_FALSE(APFloat(APFloat::IEEEsingle(), 0.0).isDenormal());
+    EXPECT_FALSE(APFloat(APFloat::IEEEsingle(), 0).isDenormal());
 
-    APFloat Val2(APFloat::IEEEsingle(), 2.0e0);
+    APFloat Val2(APFloat::IEEEsingle(), 2);
     APFloat T(APFloat::IEEEsingle(), MinNormalStr);
     T.divide(Val2, rdmd);
     EXPECT_TRUE(T.isDenormal());
@@ -603,9 +603,9 @@
   {
     const char *MinNormalStr = "2.22507385850720138309e-308";
     EXPECT_FALSE(APFloat(APFloat::IEEEdouble(), MinNormalStr).isDenormal());
-    EXPECT_FALSE(APFloat(APFloat::IEEEdouble(), 0.0).isDenormal());
+    EXPECT_FALSE(APFloat(APFloat::IEEEdouble(), 0).isDenormal());
 
-    APFloat Val2(APFloat::IEEEdouble(), 2.0e0);
+    APFloat Val2(APFloat::IEEEdouble(), 2);
     APFloat T(APFloat::IEEEdouble(), MinNormalStr);
     T.divide(Val2, rdmd);
     EXPECT_TRUE(T.isDenormal());
@@ -615,9 +615,9 @@
   {
     const char *MinNormalStr = "3.36210314311209350626e-4932";
     EXPECT_FALSE(APFloat(APFloat::x87DoubleExtended(), MinNormalStr).isDenormal());
-    EXPECT_FALSE(APFloat(APFloat::x87DoubleExtended(), 0.0).isDenormal());
+    EXPECT_FALSE(APFloat(APFloat::x87DoubleExtended(), 0).isDenormal());
 
-    APFloat Val2(APFloat::x87DoubleExtended(), 2.0e0);
+    APFloat Val2(APFloat::x87DoubleExtended(), 2);
     APFloat T(APFloat::x87DoubleExtended(), MinNormalStr);
     T.divide(Val2, rdmd);
     EXPECT_TRUE(T.isDenormal());
@@ -627,9 +627,9 @@
   {
     const char *MinNormalStr = "3.36210314311209350626267781732175260e-4932";
     EXPECT_FALSE(APFloat(APFloat::IEEEquad(), MinNormalStr).isDenormal());
-    EXPECT_FALSE(APFloat(APFloat::IEEEquad(), 0.0).isDenormal());
+    EXPECT_FALSE(APFloat(APFloat::IEEEquad(), 0).isDenormal());
 
-    APFloat Val2(APFloat::IEEEquad(), 2.0e0);
+    APFloat Val2(APFloat::IEEEquad(), 2);
     APFloat T(APFloat::IEEEquad(), MinNormalStr);
     T.divide(Val2, rdmd);
     EXPECT_TRUE(T.isDenormal());
@@ -1144,8 +1144,8 @@
 #ifdef GTEST_HAS_DEATH_TEST
 #ifndef NDEBUG
 TEST(APFloatTest, SemanticsDeath) {
-  EXPECT_DEATH(APFloat(APFloat::IEEEsingle(), 0.0f).convertToDouble(), "Float semantics are not IEEEdouble");
-  EXPECT_DEATH(APFloat(APFloat::IEEEdouble(), 0.0 ).convertToFloat(),  "Float semantics are not IEEEsingle");
+  EXPECT_DEATH(APFloat(APFloat::IEEEsingle(), 0).convertToDouble(), "Float semantics are not IEEEdouble");
+  EXPECT_DEATH(APFloat(APFloat::IEEEdouble(), 0).convertToFloat(),  "Float semantics are not IEEEsingle");
 }
 
 TEST(APFloatTest, StringDecimalDeath) {