Index: include/llvm/IR/Operator.h
===================================================================
--- include/llvm/IR/Operator.h
+++ include/llvm/IR/Operator.h
@@ -379,6 +379,7 @@
     case Instruction::ExtractElement:
     case Instruction::ShuffleVector:
     case Instruction::InsertElement:
+    case Instruction::PHI:
       return false;
     default:
       return V->getType()->isFPOrFPVectorTy();
Index: unittests/IR/InstructionsTest.cpp
===================================================================
--- unittests/IR/InstructionsTest.cpp
+++ unittests/IR/InstructionsTest.cpp
@@ -993,5 +993,14 @@
   EXPECT_EQ(nullptr, Term->getNextNonDebugInstruction());
 }
 
+TEST(InstructionsTest, PhiIsNotFPMathOperator) {
+  LLVMContext Context;
+  IRBuilder<> Builder(Context);
+  MDBuilder MDHelper(Context);
+  Instruction *I = Builder.CreatePHI(Builder.getDoubleTy(), 0);
+  EXPECT_FALSE(isa<FPMathOperator>(I));
+  I->deleteValue();
+}
+
 } // end anonymous namespace
 } // end namespace llvm