[opaque pointer types] Update CallInst creation APIs to consistently accept a callee-type argument.

[jyknight]

Summary

Note: this also adds a new C API and soft-deprecates the old C API.

[jyknight]

(Ran clang format; forgot to do before uploading before)

[whitequark]

llvm/lib/IR/Core.cpp

3600

Please add NameLen as this is the convention for all new C APIs.

[whitequark]

llvm/lib/IR/Core.cpp

3600

Actually, now that I think about it, making sure that every Name argument has a NameLen accompanying would involve deprecating hundreds of functions and will probably never get done. Maybe it's OK to not have NameLen in IRBuilder bindings.

@deadalnix @echristo your opinion on this?

[jyknight]

llvm/lib/IR/Core.cpp

3600

Why do we have this convention now? I missed that discussion.

I actually think we should consistently NOT have a NameLen argument for these APIs creating internal IR names. There's no reason to ever need a zero byte in them -- the names are entirely optional anyways! And having inconsistent APIs is just annoying here.

I see that a couple new functions were _just_ added with a NameLen argument (LLVMBuildIntCast2, LLVMCreateBasicBlockInContext) -- and for both of those, I think that argument should be _removed_ from both, ASAP (especially before the branch, which is this week).

[whitequark]

llvm/lib/IR/Core.cpp

3600

The discussion happened a while ago (maybe a year?). The point of convention is to make use of LLVM-C through FFI easier, since this is, to my best knowledge, the majority of use of LLVM-C.

I actually think we should consistently NOT have a NameLen argument for these APIs creating internal IR names. There's no reason to ever need a zero byte in them -- the names are entirely optional anyways! And having inconsistent APIs is just annoying here.

I agree. Applying it to IR names was an oversight. Absolutely nothing is gained by IR names with embedded zeroes.

[jyknight]

llvm/lib/IR/Core.cpp

3600

OK, I'll send a separate patch to remove NameLen from those two APIs.

Are you OK with this patch as it stands, then?

[whitequark]

llvm/lib/IR/Core.cpp

3600

OK, I'll send a separate patch to remove NameLen from those two APIs.

Thank you!

Are you OK with this patch as it stands, then?

Yes, this and the other one are fine.

[jyknight]

llvm/lib/IR/Core.cpp

3600

OK, I'm treating that as an "accepted" for this and D56557 (InvokeInst).

I'm not sure if you missed them in the flood of emails or just haven't had time to look, but there's also two more similar commits: D56558 (for LoadInst) and D56559 (for GetElementPtrInst).

[whitequark]

llvm/lib/IR/Core.cpp

3600

I have not missed them. I just didn't use "Accept" in phab since it appears to treat an accept from any single reviewer as a global accept, and it feels misleading for these patches. The C API changes look good to me in all four now.

[echristo]

If whitequark is happy I am :)

[niravd]

LGTM

llvm/include/llvm-c/Core.h

LLVMAttributeRef LLVMGetCallSiteStringAttribute(LLVMValueRef C,
                                                 LLVMAttributeIndex Idx,
                                                 const char *K, unsigned KLen);
 void LLVMRemoveCallSiteEnumAttribute(LLVMValueRef C, LLVMAttributeIndex Idx,
                                      unsigned KindID);
 void LLVMRemoveCallSiteStringAttribute(LLVMValueRef C, LLVMAttributeIndex Idx,
                                        const char *K, unsigned KLen);
 
 /**
+ * Obtain the function type called by this instruction.
+ *
+ * @see llvm::CallBase::getFunctionType()
+ */
+LLVMTypeRef LLVMGetCalledFunctionType(LLVMValueRef C);
+
+/**
  * Obtain the pointer to the function invoked by this instruction.
  *
  * This expects an LLVMValueRef that corresponds to a llvm::CallInst or
  * llvm::InvokeInst.
  *
  * @see llvm::CallInst::getCalledValue()
  * @see llvm::InvokeInst::getCalledValue()
  */
LLVMValueRef LLVMBuildICmp(LLVMBuilderRef, LLVMIntPredicate Op,
                            LLVMValueRef LHS, LLVMValueRef RHS,
                            const char *Name);
 LLVMValueRef LLVMBuildFCmp(LLVMBuilderRef, LLVMRealPredicate Op,
                            LLVMValueRef LHS, LLVMValueRef RHS,
                            const char *Name);
 
 /* Miscellaneous instructions */
 LLVMValueRef LLVMBuildPhi(LLVMBuilderRef, LLVMTypeRef Ty, const char *Name);
+// LLVMBuildCall is deprecated in favor of LLVMBuildCall2, in preparation for
+// opaque pointer types.
 LLVMValueRef LLVMBuildCall(LLVMBuilderRef, LLVMValueRef Fn,
                            LLVMValueRef *Args, unsigned NumArgs,
                            const char *Name);
+LLVMValueRef LLVMBuildCall2(LLVMBuilderRef, LLVMTypeRef, LLVMValueRef Fn,
+                            LLVMValueRef *Args, unsigned NumArgs,
+                            const char *Name);
 LLVMValueRef LLVMBuildSelect(LLVMBuilderRef, LLVMValueRef If,
                              LLVMValueRef Then, LLVMValueRef Else,
                              const char *Name);
 LLVMValueRef LLVMBuildVAArg(LLVMBuilderRef, LLVMValueRef List, LLVMTypeRef Ty,
                             const char *Name);
 LLVMValueRef LLVMBuildExtractElement(LLVMBuilderRef, LLVMValueRef VecVal,
                                      LLVMValueRef Index, const char *Name);
 LLVMValueRef LLVMBuildInsertElement(LLVMBuilderRef, LLVMValueRef VecVal,

llvm/include/llvm/IR/IRBuilder.h

public:
   // Instruction creation methods: Other Instructions
   //===--------------------------------------------------------------------===//
 
   PHINode *CreatePHI(Type *Ty, unsigned NumReservedValues,
                      const Twine &Name = "") {
     return Insert(PHINode::Create(Ty, NumReservedValues), Name);
   }
 
-  CallInst *CreateCall(Value *Callee, ArrayRef<Value *> Args = None,
-                       const Twine &Name = "", MDNode *FPMathTag = nullptr) {
-    auto *PTy = cast<PointerType>(Callee->getType());
-    auto *FTy = cast<FunctionType>(PTy->getElementType());
-    return CreateCall(FTy, Callee, Args, Name, FPMathTag);
-  }
-
   CallInst *CreateCall(FunctionType *FTy, Value *Callee,
-                       ArrayRef<Value *> Args, const Twine &Name = "",
+                       ArrayRef<Value *> Args = None, const Twine &Name = "",
                        MDNode *FPMathTag = nullptr) {
     CallInst *CI = CallInst::Create(FTy, Callee, Args, DefaultOperandBundles);
     if (isa<FPMathOperator>(CI))
       CI = cast<CallInst>(setFPAttrs(CI, FPMathTag, FMF));
     return Insert(CI, Name);
   }
 
-  CallInst *CreateCall(Value *Callee, ArrayRef<Value *> Args,
+  CallInst *CreateCall(FunctionType *FTy, Value *Callee, ArrayRef<Value *> Args,
                        ArrayRef<OperandBundleDef> OpBundles,
                        const Twine &Name = "", MDNode *FPMathTag = nullptr) {
-    CallInst *CI = CallInst::Create(Callee, Args, OpBundles);
+    CallInst *CI = CallInst::Create(FTy, Callee, Args, OpBundles);
     if (isa<FPMathOperator>(CI))
       CI = cast<CallInst>(setFPAttrs(CI, FPMathTag, FMF));
     return Insert(CI, Name);
   }
 
-  CallInst *CreateCall(Function *Callee, ArrayRef<Value *> Args,
+  CallInst *CreateCall(Function *Callee, ArrayRef<Value *> Args = None,
                        const Twine &Name = "", MDNode *FPMathTag = nullptr) {
     return CreateCall(Callee->getFunctionType(), Callee, Args, Name, FPMathTag);
   }
 
+  CallInst *CreateCall(Function *Callee, ArrayRef<Value *> Args,
+                       ArrayRef<OperandBundleDef> OpBundles,
+                       const Twine &Name = "", MDNode *FPMathTag = nullptr) {
+    return CreateCall(Callee->getFunctionType(), Callee, Args, OpBundles, Name,
+                      FPMathTag);
+  }
+
+  // Deprecated [opaque pointer types]
+  CallInst *CreateCall(Value *Callee, ArrayRef<Value *> Args = None,
+                       const Twine &Name = "", MDNode *FPMathTag = nullptr) {
+    return CreateCall(
+        cast<FunctionType>(Callee->getType()->getPointerElementType()), Callee,
+        Args, Name, FPMathTag);
+  }
+
+  // Deprecated [opaque pointer types]
+  CallInst *CreateCall(Value *Callee, ArrayRef<Value *> Args,
+                       ArrayRef<OperandBundleDef> OpBundles,
+                       const Twine &Name = "", MDNode *FPMathTag = nullptr) {
+    return CreateCall(
+        cast<FunctionType>(Callee->getType()->getPointerElementType()), Callee,
+        Args, OpBundles, Name, FPMathTag);
+  }
+
   Value *CreateSelect(Value *C, Value *True, Value *False,
                       const Twine &Name = "", Instruction *MDFrom = nullptr) {
     if (auto *CC = dyn_cast<Constant>(C))
       if (auto *TC = dyn_cast<Constant>(True))
         if (auto *FC = dyn_cast<Constant>(False))
           return Insert(Folder.CreateSelect(CC, TC, FC), Name);
 
     SelectInst *Sel = SelectInst::Create(C, True, False);

llvm/include/llvm/IR/Instructions.h

class CallInst : public CallBase {
   CallInst(const CallInst &CI);
 
   /// Construct a CallInst given a range of arguments.
   /// Construct a CallInst from a range of arguments
   inline CallInst(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args,
                   ArrayRef<OperandBundleDef> Bundles, const Twine &NameStr,
                   Instruction *InsertBefore);
 
-  inline CallInst(Value *Func, ArrayRef<Value *> Args,
-                  ArrayRef<OperandBundleDef> Bundles, const Twine &NameStr,
-                  Instruction *InsertBefore)
-      : CallInst(cast<FunctionType>(
-                     cast<PointerType>(Func->getType())->getElementType()),
-                 Func, Args, Bundles, NameStr, InsertBefore) {}
-
-  inline CallInst(Value *Func, ArrayRef<Value *> Args, const Twine &NameStr,
-                  Instruction *InsertBefore)
-      : CallInst(Func, Args, None, NameStr, InsertBefore) {}
+  inline CallInst(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args,
+                  const Twine &NameStr, Instruction *InsertBefore)
+      : CallInst(Ty, Func, Args, None, NameStr, InsertBefore) {}
 
   /// Construct a CallInst given a range of arguments.
   /// Construct a CallInst from a range of arguments
-  inline CallInst(Value *Func, ArrayRef<Value *> Args,
+  inline CallInst(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args,
                   ArrayRef<OperandBundleDef> Bundles, const Twine &NameStr,
                   BasicBlock *InsertAtEnd);
 
-  explicit CallInst(Value *F, const Twine &NameStr, Instruction *InsertBefore);
+  explicit CallInst(FunctionType *Ty, Value *F, const Twine &NameStr,
+                    Instruction *InsertBefore);
 
-  CallInst(Value *F, const Twine &NameStr, BasicBlock *InsertAtEnd);
+  CallInst(FunctionType *ty, Value *F, const Twine &NameStr,
+           BasicBlock *InsertAtEnd);
 
-  void init(Value *Func, ArrayRef<Value *> Args,
-            ArrayRef<OperandBundleDef> Bundles, const Twine &NameStr) {
-    init(cast<FunctionType>(
-             cast<PointerType>(Func->getType())->getElementType()),
-         Func, Args, Bundles, NameStr);
-  }
   void init(FunctionType *FTy, Value *Func, ArrayRef<Value *> Args,
             ArrayRef<OperandBundleDef> Bundles, const Twine &NameStr);
-  void init(Value *Func, const Twine &NameStr);
+  void init(FunctionType *FTy, Value *Func, const Twine &NameStr);
 
   /// Compute the number of operands to allocate.
   static int ComputeNumOperands(int NumArgs, int NumBundleInputs = 0) {
     // We need one operand for the called function, plus the input operand
     // counts provided.
     return 1 + NumArgs + NumBundleInputs;
   }
 
 protected:
   // Note: Instruction needs to be a friend here to call cloneImpl.
   friend class Instruction;
 
   CallInst *cloneImpl() const;
 
 public:
-  static CallInst *Create(Value *Func, ArrayRef<Value *> Args,
-                          ArrayRef<OperandBundleDef> Bundles = None,
-                          const Twine &NameStr = "",
-                          Instruction *InsertBefore = nullptr) {
-    return Create(cast<FunctionType>(
-                      cast<PointerType>(Func->getType())->getElementType()),
-                  Func, Args, Bundles, NameStr, InsertBefore);
-  }
-
-  static CallInst *Create(Value *Func, ArrayRef<Value *> Args,
-                          const Twine &NameStr,
+  static CallInst *Create(FunctionType *Ty, Value *F, const Twine &NameStr = "",
                           Instruction *InsertBefore = nullptr) {
-    return Create(cast<FunctionType>(
-                      cast<PointerType>(Func->getType())->getElementType()),
-                  Func, Args, None, NameStr, InsertBefore);
+    return new (ComputeNumOperands(0)) CallInst(Ty, F, NameStr, InsertBefore);
   }
 
   static CallInst *Create(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args,
                           const Twine &NameStr,
                           Instruction *InsertBefore = nullptr) {
     return new (ComputeNumOperands(Args.size()))
         CallInst(Ty, Func, Args, None, NameStr, InsertBefore);
   }
 
   static CallInst *Create(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args,
                           ArrayRef<OperandBundleDef> Bundles = None,
                           const Twine &NameStr = "",
                           Instruction *InsertBefore = nullptr) {
     const int NumOperands =
         ComputeNumOperands(Args.size(), CountBundleInputs(Bundles));
     const unsigned DescriptorBytes = Bundles.size() * sizeof(BundleOpInfo);
 
     return new (NumOperands, DescriptorBytes)
         CallInst(Ty, Func, Args, Bundles, NameStr, InsertBefore);
   }
 
-  static CallInst *Create(Value *Func, ArrayRef<Value *> Args,
+  static CallInst *Create(FunctionType *Ty, Value *F, const Twine &NameStr,
+                          BasicBlock *InsertAtEnd) {
+    return new (ComputeNumOperands(0)) CallInst(Ty, F, NameStr, InsertAtEnd);
+  }
+
+  static CallInst *Create(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args,
+                          const Twine &NameStr, BasicBlock *InsertAtEnd) {
+    return new (ComputeNumOperands(Args.size()))
+        CallInst(Ty, Func, Args, None, NameStr, InsertAtEnd);
+  }
+
+  static CallInst *Create(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args,
                           ArrayRef<OperandBundleDef> Bundles,
                           const Twine &NameStr, BasicBlock *InsertAtEnd) {
     const int NumOperands =
         ComputeNumOperands(Args.size(), CountBundleInputs(Bundles));
     const unsigned DescriptorBytes = Bundles.size() * sizeof(BundleOpInfo);
 
     return new (NumOperands, DescriptorBytes)
-        CallInst(Func, Args, Bundles, NameStr, InsertAtEnd);
+        CallInst(Ty, Func, Args, Bundles, NameStr, InsertAtEnd);
   }
 
-  static CallInst *Create(Value *Func, ArrayRef<Value *> Args,
+  static CallInst *Create(Function *Func, const Twine &NameStr = "",
+                          Instruction *InsertBefore = nullptr) {
+    return Create(Func->getFunctionType(), Func, NameStr, InsertBefore);
+  }
+
+  static CallInst *Create(Function *Func, ArrayRef<Value *> Args,
+                          const Twine &NameStr = "",
+                          Instruction *InsertBefore = nullptr) {
+    return Create(Func->getFunctionType(), Func, Args, NameStr, InsertBefore);
+  }
+
+  static CallInst *Create(Function *Func, const Twine &NameStr,
+                          BasicBlock *InsertAtEnd) {
+    return Create(Func->getFunctionType(), Func, NameStr, InsertAtEnd);
+  }
+
+  static CallInst *Create(Function *Func, ArrayRef<Value *> Args,
                           const Twine &NameStr, BasicBlock *InsertAtEnd) {
-    return new (ComputeNumOperands(Args.size()))
-        CallInst(Func, Args, None, NameStr, InsertAtEnd);
+    return Create(Func->getFunctionType(), Func, Args, NameStr, InsertAtEnd);
+  }
+
+  // Deprecated [opaque pointer types]
+  static CallInst *Create(Value *Func, const Twine &NameStr = "",
+                          Instruction *InsertBefore = nullptr) {
+    return Create(cast<FunctionType>(
+                      cast<PointerType>(Func->getType())->getElementType()),
+                  Func, NameStr, InsertBefore);
+  }
+
+  // Deprecated [opaque pointer types]
+  static CallInst *Create(Value *Func, ArrayRef<Value *> Args,
+                          const Twine &NameStr,
+                          Instruction *InsertBefore = nullptr) {
+    return Create(cast<FunctionType>(
+                      cast<PointerType>(Func->getType())->getElementType()),
+                  Func, Args, NameStr, InsertBefore);
   }
 
-  static CallInst *Create(Value *F, const Twine &NameStr = "",
+  // Deprecated [opaque pointer types]
+  static CallInst *Create(Value *Func, ArrayRef<Value *> Args,
+                          ArrayRef<OperandBundleDef> Bundles = None,
+                          const Twine &NameStr = "",
                           Instruction *InsertBefore = nullptr) {
-    return new (ComputeNumOperands(0)) CallInst(F, NameStr, InsertBefore);
+    return Create(cast<FunctionType>(
+                      cast<PointerType>(Func->getType())->getElementType()),
+                  Func, Args, Bundles, NameStr, InsertBefore);
   }
 
-  static CallInst *Create(Value *F, const Twine &NameStr,
+  // Deprecated [opaque pointer types]
+  static CallInst *Create(Value *Func, const Twine &NameStr,
                           BasicBlock *InsertAtEnd) {
-    return new (ComputeNumOperands(0)) CallInst(F, NameStr, InsertAtEnd);
+    return Create(cast<FunctionType>(
+                      cast<PointerType>(Func->getType())->getElementType()),
+                  Func, NameStr, InsertAtEnd);
+  }
+
+  // Deprecated [opaque pointer types]
+  static CallInst *Create(Value *Func, ArrayRef<Value *> Args,
+                          const Twine &NameStr, BasicBlock *InsertAtEnd) {
+    return Create(cast<FunctionType>(
+                      cast<PointerType>(Func->getType())->getElementType()),
+                  Func, Args, NameStr, InsertAtEnd);
+  }
+
+  // Deprecated [opaque pointer types]
+  static CallInst *Create(Value *Func, ArrayRef<Value *> Args,
+                          ArrayRef<OperandBundleDef> Bundles,
+                          const Twine &NameStr, BasicBlock *InsertAtEnd) {
+    return Create(cast<FunctionType>(
+                      cast<PointerType>(Func->getType())->getElementType()),
+                  Func, Args, Bundles, NameStr, InsertAtEnd);
   }
 
   /// Create a clone of \p CI with a different set of operand bundles and
   /// insert it before \p InsertPt.
   ///
   /// The returned call instruction is identical \p CI in every way except that
   /// the operand bundles for the new instruction are set to the operand bundles
   /// in \p Bundles.

 private:
   // Shadow Instruction::setInstructionSubclassData with a private forwarding
   // method so that subclasses cannot accidentally use it.
   void setInstructionSubclassData(unsigned short D) {
     Instruction::setInstructionSubclassData(D);
   }
 };
 
-CallInst::CallInst(Value *Func, ArrayRef<Value *> Args,
+CallInst::CallInst(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args,
                    ArrayRef<OperandBundleDef> Bundles, const Twine &NameStr,
                    BasicBlock *InsertAtEnd)
-    : CallBase(cast<FunctionType>(
-                   cast<PointerType>(Func->getType())->getElementType())
-                   ->getReturnType(),
-               Instruction::Call,
+    : CallBase(Ty->getReturnType(), Instruction::Call,
                OperandTraits<CallBase>::op_end(this) -
                    (Args.size() + CountBundleInputs(Bundles) + 1),
                unsigned(Args.size() + CountBundleInputs(Bundles) + 1),
                InsertAtEnd) {
-  init(Func, Args, Bundles, NameStr);
+  init(Ty, Func, Args, Bundles, NameStr);
 }
 
 CallInst::CallInst(FunctionType *Ty, Value *Func, ArrayRef<Value *> Args,
                    ArrayRef<OperandBundleDef> Bundles, const Twine &NameStr,
                    Instruction *InsertBefore)
     : CallBase(Ty->getReturnType(), Instruction::Call,
                OperandTraits<CallBase>::op_end(this) -
                    (Args.size() + CountBundleInputs(Bundles) + 1),

llvm/include/llvm/IR/Module.h

/// @{
   }
 
   /// Same as above, but without the attributes.
   template<typename... ArgsTy>
   Constant *getOrInsertFunction(StringRef Name, Type *RetTy, ArgsTy... Args) {
     return getOrInsertFunction(Name, AttributeList{}, RetTy, Args...);
   }
 
+  // Avoid an incorrect ordering that'd otherwise compile incorrectly.
+  template <typename... ArgsTy>
+  Constant *getOrInsertFunction(StringRef Name, AttributeList AttributeList,
+                                FunctionType *Invalid, ArgsTy... Args) = delete;
+
   /// Look up the specified function in the module symbol table. If it does not
   /// exist, return null.
   Function *getFunction(StringRef Name) const;
 
 /// @}
 /// @name Global Variable Accessors
 /// @{
 

llvm/lib/IR/Core.cpp

void LLVMRemoveCallSiteStringAttribute(LLVMValueRef C, LLVMAttributeIndex Idx,
                                        const char *K, unsigned KLen) {
   unwrap<CallBase>(C)->removeAttribute(Idx, StringRef(K, KLen));
 }
 
 LLVMValueRef LLVMGetCalledValue(LLVMValueRef Instr) {
   return wrap(unwrap<CallBase>(Instr)->getCalledValue());
 }
 
+LLVMTypeRef LLVMGetCalledFunctionType(LLVMValueRef Instr) {
+  return wrap(unwrap<CallBase>(Instr)->getFunctionType());
+}
+
 /*--.. Operations on call instructions (only) ..............................--*/
 
 LLVMBool LLVMIsTailCall(LLVMValueRef Call) {
   return unwrap<CallInst>(Call)->isTailCall();
 }
 
 void LLVMSetTailCall(LLVMValueRef Call, LLVMBool isTailCall) {
   unwrap<CallInst>(Call)->setTailCall(isTailCall);

 
 LLVMValueRef LLVMBuildPhi(LLVMBuilderRef B, LLVMTypeRef Ty, const char *Name) {
   return wrap(unwrap(B)->CreatePHI(unwrap(Ty), 0, Name));
 }
 
 LLVMValueRef LLVMBuildCall(LLVMBuilderRef B, LLVMValueRef Fn,
                            LLVMValueRef *Args, unsigned NumArgs,
                            const char *Name) {
-  return wrap(unwrap(B)->CreateCall(unwrap(Fn),
-                                    makeArrayRef(unwrap(Args), NumArgs),
-                                    Name));
+  Value *V = unwrap(Fn);
+  FunctionType *FnT =
+      cast<FunctionType>(cast<PointerType>(V->getType())->getElementType());
+
+  return wrap(unwrap(B)->CreateCall(FnT, unwrap(Fn),
+                                    makeArrayRef(unwrap(Args), NumArgs), Name));
+}
+
+LLVMValueRef LLVMBuildCall2(LLVMBuilderRef B, LLVMTypeRef Ty, LLVMValueRef Fn,
+                            LLVMValueRef *Args, unsigned NumArgs,
+                            const char *Name) {
+  FunctionType *FTy = unwrap<FunctionType>(Ty);
+  return wrap(unwrap(B)->CreateCall(FTy, unwrap(Fn),
+                                    makeArrayRef(unwrap(Args), NumArgs), Name));
 }
 
 LLVMValueRef LLVMBuildSelect(LLVMBuilderRef B, LLVMValueRef If,
                              LLVMValueRef Then, LLVMValueRef Else,
                              const char *Name) {
   return wrap(unwrap(B)->CreateSelect(unwrap(If), unwrap(Then), unwrap(Else),
                                       Name));
 }

llvm/lib/IR/Instructions.cpp

#endif
 
   auto It = populateBundleOperandInfos(Bundles, Args.size());
   (void)It;
   assert(It + 1 == op_end() && "Should add up!");
 
   setName(NameStr);
 }
 
-void CallInst::init(Value *Func, const Twine &NameStr) {
-  FTy =
-      cast<FunctionType>(cast<PointerType>(Func->getType())->getElementType());
+void CallInst::init(FunctionType *FTy, Value *Func, const Twine &NameStr) {
+  this->FTy = FTy;
   assert(getNumOperands() == 1 && "NumOperands not set up?");
   setCalledOperand(Func);
 
   assert(FTy->getNumParams() == 0 && "Calling a function with bad signature");
 
   setName(NameStr);
 }
 
-CallInst::CallInst(Value *Func, const Twine &Name, Instruction *InsertBefore)
-    : CallBase(cast<FunctionType>(
-                   cast<PointerType>(Func->getType())->getElementType())
-                   ->getReturnType(),
-               Instruction::Call, OperandTraits<CallBase>::op_end(this) - 1, 1,
-               InsertBefore) {
-  init(Func, Name);
+CallInst::CallInst(FunctionType *Ty, Value *Func, const Twine &Name,
+                   Instruction *InsertBefore)
+    : CallBase(Ty->getReturnType(), Instruction::Call,
+               OperandTraits<CallBase>::op_end(this) - 1, 1, InsertBefore) {
+  init(Ty, Func, Name);
 }
 
-CallInst::CallInst(Value *Func, const Twine &Name, BasicBlock *InsertAtEnd)
-    : CallBase(cast<FunctionType>(
-                   cast<PointerType>(Func->getType())->getElementType())
-                   ->getReturnType(),
-               Instruction::Call, OperandTraits<CallBase>::op_end(this) - 1, 1,
-               InsertAtEnd) {
-  init(Func, Name);
+CallInst::CallInst(FunctionType *Ty, Value *Func, const Twine &Name,
+                   BasicBlock *InsertAtEnd)
+    : CallBase(Ty->getReturnType(), Instruction::Call,
+               OperandTraits<CallBase>::op_end(this) - 1, 1, InsertAtEnd) {
+  init(Ty, Func, Name);
 }
 
 CallInst::CallInst(const CallInst &CI)
     : CallBase(CI.Attrs, CI.FTy, CI.getType(), Instruction::Call,
                OperandTraits<CallBase>::op_end(this) - CI.getNumOperands(),
                CI.getNumOperands()) {
   setTailCallKind(CI.getTailCallKind());
   setCallingConv(CI.getCallingConv());