[IR] Add UnaryOperator::CreateFNegFMF(...)

[cameron.mcinally]

Summary

I'm not sure if InstructionsTest.cpp is the correct place for this test, but it seems like the best fit.

[cameron.mcinally]

Ping...

[spatel]

LGTM

[spatel]

llvm/include/llvm/IR/InstrTypes.h

168

Sorry, I missed this on 1st glance: we should be passing the "Name" parameter through here.

[cameron.mcinally]

llvm/include/llvm/IR/InstrTypes.h

168

Good catch. I copied that from BinaryOperator::CreateFNegFMF(...). I'll update both if there are no objections.

[spatel]

llvm/include/llvm/IR/InstrTypes.h

168

Yes, please fix both.

llvm/include/llvm/IR/InstrTypes.h

 #include "llvm/IR/Instruction.def"
 #define HANDLE_UNARY_INST(N, OPC, CLASS) \
   static UnaryOperator *Create##OPC(Value *V, const Twine &Name, \
                                     Instruction *I) {\
     return Create(Instruction::OPC, V, Name, I);\
   }
 #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());
   }
 
   // Methods for support type inquiry through isa, cast, and dyn_cast:
   static bool classof(const Instruction *I) {
     return I->isUnaryOp();
   }

llvm/unittests/IR/InstructionsTest.cpp

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();
 }
 
+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