diff --git a/include/llvm/ADT/APFloat.h b/include/llvm/ADT/APFloat.h
index 4ccb96ab765..7e71dd33931 100644
--- a/include/llvm/ADT/APFloat.h
+++ b/include/llvm/ADT/APFloat.h
@@ -191,6 +191,7 @@ public:
   APFloat(const fltSemantics &); // Default construct to 0.0
   APFloat(const fltSemantics &, StringRef);
   APFloat(const fltSemantics &, integerPart);
+  APFloat(const fltSemantics &, fltCategory, bool negative);
   APFloat(const fltSemantics &, uninitializedTag);
   APFloat(const fltSemantics &, const APInt &);
   explicit APFloat(double d);
diff --git a/lib/Support/APFloat.cpp b/lib/Support/APFloat.cpp
index a7ff9f68cf7..2eaf2b56bd5 100644
--- a/lib/Support/APFloat.cpp
+++ b/lib/Support/APFloat.cpp
@@ -795,6 +795,17 @@ APFloat::APFloat(const fltSemantics &ourSemantics, uninitializedTag tag) {
   initialize(&ourSemantics);
 }
 
+APFloat::APFloat(const fltSemantics &ourSemantics,
+                 fltCategory ourCategory, bool negative) {
+  initialize(&ourSemantics);
+  category = ourCategory;
+  sign = negative;
+  if (isFiniteNonZero())
+    category = fcZero;
+  else if (ourCategory == fcNaN)
+    makeNaN();
+}
+
 APFloat::APFloat(const fltSemantics &ourSemantics, StringRef text) {
   initialize(&ourSemantics);
   convertFromString(text, rmNearestTiesToEven);
@@ -2395,8 +2406,8 @@ APFloat::roundSignificandWithExponent(const integerPart *decSigParts,
     excessPrecision = calcSemantics.precision - semantics->precision;
     truncatedBits = excessPrecision;
 
-    APFloat decSig = APFloat::getZero(calcSemantics, sign);
-    APFloat pow5(calcSemantics);
+    APFloat decSig(calcSemantics, fcZero, sign);
+    APFloat pow5(calcSemantics, fcZero, false);
 
     sigStatus = decSig.convertFromUnsignedParts(decSigParts, sigPartCount,
                                                 rmNearestTiesToEven);
@@ -3377,16 +3388,15 @@ APFloat APFloat::getSmallest(const fltSemantics &Sem, bool Negative) {
 }
 
 APFloat APFloat::getSmallestNormalized(const fltSemantics &Sem, bool Negative) {
-  APFloat Val(Sem, uninitialized);
+  APFloat Val(Sem, fcNormal, Negative);
 
   // We want (in interchange format):
   //   sign = {Negative}
   //   exponent = 0..0
   //   significand = 10..0
 
-  Val.zeroSignificand();
-  Val.sign = Negative;
   Val.exponent = Sem.minExponent;
+  Val.zeroSignificand();
   Val.significandParts()[partCountForBits(Sem.precision)-1] |=
     (((integerPart) 1) << ((Sem.precision - 1) % integerPartWidth));
 
diff --git a/lib/Transforms/InstCombine/InstCombineCompares.cpp b/lib/Transforms/InstCombine/InstCombineCompares.cpp
index 617d8e7a5c1..af8a479f295 100644
--- a/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -2888,7 +2888,7 @@ Instruction *InstCombiner::FoldFCmp_IntToFP_Cst(FCmpInst &I,
   if (!LHSUnsigned) {
     // If the RHS value is > SignedMax, fold the comparison.  This handles +INF
     // and large values.
-    APFloat SMax(RHS.getSemantics());
+    APFloat SMax(RHS.getSemantics(), APFloat::fcZero, false);
     SMax.convertFromAPInt(APInt::getSignedMaxValue(IntWidth), true,
                           APFloat::rmNearestTiesToEven);
     if (SMax.compare(RHS) == APFloat::cmpLessThan) {  // smax < 13123.0
@@ -2900,7 +2900,7 @@ Instruction *InstCombiner::FoldFCmp_IntToFP_Cst(FCmpInst &I,
   } else {
     // If the RHS value is > UnsignedMax, fold the comparison. This handles
     // +INF and large values.
-    APFloat UMax(RHS.getSemantics());
+    APFloat UMax(RHS.getSemantics(), APFloat::fcZero, false);
     UMax.convertFromAPInt(APInt::getMaxValue(IntWidth), false,
                           APFloat::rmNearestTiesToEven);
     if (UMax.compare(RHS) == APFloat::cmpLessThan) {  // umax < 13123.0
@@ -2913,7 +2913,7 @@ Instruction *InstCombiner::FoldFCmp_IntToFP_Cst(FCmpInst &I,
 
   if (!LHSUnsigned) {
     // See if the RHS value is < SignedMin.
-    APFloat SMin(RHS.getSemantics());
+    APFloat SMin(RHS.getSemantics(), APFloat::fcZero, false);
     SMin.convertFromAPInt(APInt::getSignedMinValue(IntWidth), true,
                           APFloat::rmNearestTiesToEven);
     if (SMin.compare(RHS) == APFloat::cmpGreaterThan) { // smin > 12312.0
@@ -2924,7 +2924,7 @@ Instruction *InstCombiner::FoldFCmp_IntToFP_Cst(FCmpInst &I,
     }
   } else {
     // See if the RHS value is < UnsignedMin.
-    APFloat SMin(RHS.getSemantics());
+    APFloat SMin(RHS.getSemantics(), APFloat::fcZero, false);
     SMin.convertFromAPInt(APInt::getMinValue(IntWidth), true,
                           APFloat::rmNearestTiesToEven);
     if (SMin.compare(RHS) == APFloat::cmpGreaterThan) { // umin > 12312.0