Index: llvm/include/llvm/IR/InstrTypes.h
===================================================================
--- llvm/include/llvm/IR/InstrTypes.h
+++ llvm/include/llvm/IR/InstrTypes.h
@@ -154,6 +154,20 @@
   }
 #include "llvm/IR/Instruction.def"
 
+  static UnaryOperator *CreateWithCopiedFlags(UnaryOps Opc,
+                                              Value *V,
+                                              Instruction *CopyO,
+                                              const Twine &Name = "") {
+    UnaryOperator *UO = Create(Opc, V, Name);
+    UO->copyIRFlags(CopyO);
+    return UO;
+  }
+
+  static UnaryOperator *CreateFNegFMF(Value *Op, Instruction *FMFSource,
+                                      const Twine &Name = "") {
+    return CreateWithCopiedFlags(Instruction::FNeg, Op, FMFSource);
+  }
+
   UnaryOps getOpcode() const {
     return static_cast<UnaryOps>(Instruction::getOpcode());
   }
Index: llvm/unittests/IR/InstructionsTest.cpp
===================================================================
--- llvm/unittests/IR/InstructionsTest.cpp
+++ llvm/unittests/IR/InstructionsTest.cpp
@@ -1002,5 +1002,23 @@
   I->deleteValue();
 }
 
+TEST(InstructionsTest, FNegInstruction) {
+  LLVMContext Context;
+  Type *FltTy = Type::getFloatTy(Context);
+  Constant *One = ConstantFP::get(FltTy, 1.0);
+  BinaryOperator *FAdd = BinaryOperator::CreateFAdd(One, One);
+  FAdd->setHasNoNaNs(true);
+  UnaryOperator *FNeg = UnaryOperator::CreateFNegFMF(One, FAdd);
+  EXPECT_TRUE(FNeg->hasNoNaNs());
+  EXPECT_FALSE(FNeg->hasNoInfs());
+  EXPECT_FALSE(FNeg->hasNoSignedZeros());
+  EXPECT_FALSE(FNeg->hasAllowReciprocal());
+  EXPECT_FALSE(FNeg->hasAllowContract());
+  EXPECT_FALSE(FNeg->hasAllowReassoc());
+  EXPECT_FALSE(FNeg->hasApproxFunc());
+  FAdd->deleteValue();
+  FNeg->deleteValue();
+}
+
 } // end anonymous namespace
 } // end namespace llvm