diff --git a/llvm/include/llvm/ADT/APFloat.h b/llvm/include/llvm/ADT/APFloat.h
--- a/llvm/include/llvm/ADT/APFloat.h
+++ b/llvm/include/llvm/ADT/APFloat.h
@@ -1243,12 +1243,6 @@
   return X;
 }
 
-/// Returns the negated value of the argument.
-inline APFloat neg(APFloat X) {
-  X.changeSign();
-  return X;
-}
-
 /// Implements IEEE minNum semantics. Returns the smaller of the 2 arguments if
 /// both are not NaN. If either argument is a NaN, returns the other argument.
 LLVM_READONLY
diff --git a/llvm/unittests/ADT/APFloatTest.cpp b/llvm/unittests/ADT/APFloatTest.cpp
--- a/llvm/unittests/ADT/APFloatTest.cpp
+++ b/llvm/unittests/ADT/APFloatTest.cpp
@@ -2980,17 +2980,6 @@
   APFloat QNaN = APFloat::getNaN(APFloat::IEEEsingle(), false);
   APFloat NegQNaN = APFloat::getNaN(APFloat::IEEEsingle(), true);
 
-  EXPECT_TRUE(NegOne.bitwiseIsEqual(neg(One)));
-  EXPECT_TRUE(One.bitwiseIsEqual(neg(NegOne)));
-  EXPECT_TRUE(NegZero.bitwiseIsEqual(neg(Zero)));
-  EXPECT_TRUE(Zero.bitwiseIsEqual(neg(NegZero)));
-  EXPECT_TRUE(NegInf.bitwiseIsEqual(neg(Inf)));
-  EXPECT_TRUE(Inf.bitwiseIsEqual(neg(NegInf)));
-  EXPECT_TRUE(NegInf.bitwiseIsEqual(neg(Inf)));
-  EXPECT_TRUE(Inf.bitwiseIsEqual(neg(NegInf)));
-  EXPECT_TRUE(NegQNaN.bitwiseIsEqual(neg(QNaN)));
-  EXPECT_TRUE(QNaN.bitwiseIsEqual(neg(NegQNaN)));
-
   EXPECT_TRUE(NegOne.bitwiseIsEqual(-One));
   EXPECT_TRUE(One.bitwiseIsEqual(-NegOne));
   EXPECT_TRUE(NegZero.bitwiseIsEqual(-Zero));