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//===- NoFolder.h - Constant folding helper ---------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the NoFolder class, a helper for IRBuilder. It provides
// IRBuilder with a set of methods for creating unfolded constants. This is
// useful for learners trying to understand how LLVM IR works, and who don't
// want details to be hidden by the constant folder. For general constant
// creation and folding, use ConstantExpr and the routines in
// llvm/Analysis/ConstantFolding.h.
//
// Note: since it is not actually possible to create unfolded constants, this
// class returns instructions rather than constants.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_NOFOLDER_H
#define LLVM_IR_NOFOLDER_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IRBuilderFolder.h"
namespace llvm {
/// NoFolder - Create "constants" (actually, instructions) with no folding.
class NoFolder final : public IRBuilderFolder {
virtual void anchor();
public:
explicit NoFolder() = default;
//===--------------------------------------------------------------------===//
// Value-based folders.
//
// Return an existing value or a constant if the operation can be simplified.
// Otherwise return nullptr.
//===--------------------------------------------------------------------===//
Value *FoldAdd(Value *LHS, Value *RHS, bool HasNUW = false,
bool HasNSW = false) const override {
return nullptr;
}
Value *FoldAnd(Value *LHS, Value *RHS) const override { return nullptr; }
Value *FoldOr(Value *LHS, Value *RHS) const override { return nullptr; }
Value *FoldICmp(CmpInst::Predicate P, Value *LHS, Value *RHS) const override {
return nullptr;
}
Value *FoldGEP(Type *Ty, Value *Ptr, ArrayRef<Value *> IdxList,
bool IsInBounds = false) const override {
return nullptr;
}
Value *FoldSelect(Value *C, Value *True, Value *False) const override {
return nullptr;
}
//===--------------------------------------------------------------------===//
// Binary Operators
//===--------------------------------------------------------------------===//
Instruction *CreateFAdd(Constant *LHS, Constant *RHS) const override {
return BinaryOperator::CreateFAdd(LHS, RHS);
}
Instruction *CreateSub(Constant *LHS, Constant *RHS,
bool HasNUW = false,
bool HasNSW = false) const override {
BinaryOperator *BO = BinaryOperator::CreateSub(LHS, RHS);
if (HasNUW) BO->setHasNoUnsignedWrap();
if (HasNSW) BO->setHasNoSignedWrap();
return BO;
}
Instruction *CreateFSub(Constant *LHS, Constant *RHS) const override {
return BinaryOperator::CreateFSub(LHS, RHS);
}
Instruction *CreateMul(Constant *LHS, Constant *RHS,
bool HasNUW = false,
bool HasNSW = false) const override {
BinaryOperator *BO = BinaryOperator::CreateMul(LHS, RHS);
if (HasNUW) BO->setHasNoUnsignedWrap();
if (HasNSW) BO->setHasNoSignedWrap();
return BO;
}
Instruction *CreateFMul(Constant *LHS, Constant *RHS) const override {
return BinaryOperator::CreateFMul(LHS, RHS);
}
Instruction *CreateUDiv(Constant *LHS, Constant *RHS,
bool isExact = false) const override {
if (!isExact)
return BinaryOperator::CreateUDiv(LHS, RHS);
return BinaryOperator::CreateExactUDiv(LHS, RHS);
}
Instruction *CreateSDiv(Constant *LHS, Constant *RHS,
bool isExact = false) const override {
if (!isExact)
return BinaryOperator::CreateSDiv(LHS, RHS);
return BinaryOperator::CreateExactSDiv(LHS, RHS);
}
Instruction *CreateFDiv(Constant *LHS, Constant *RHS) const override {
return BinaryOperator::CreateFDiv(LHS, RHS);
}
Instruction *CreateURem(Constant *LHS, Constant *RHS) const override {
return BinaryOperator::CreateURem(LHS, RHS);
}
Instruction *CreateSRem(Constant *LHS, Constant *RHS) const override {
return BinaryOperator::CreateSRem(LHS, RHS);
}
Instruction *CreateFRem(Constant *LHS, Constant *RHS) const override {
return BinaryOperator::CreateFRem(LHS, RHS);
}
Instruction *CreateShl(Constant *LHS, Constant *RHS, bool HasNUW = false,
bool HasNSW = false) const override {
BinaryOperator *BO = BinaryOperator::CreateShl(LHS, RHS);
if (HasNUW) BO->setHasNoUnsignedWrap();
if (HasNSW) BO->setHasNoSignedWrap();
return BO;
}
Instruction *CreateLShr(Constant *LHS, Constant *RHS,
bool isExact = false) const override {
if (!isExact)
return BinaryOperator::CreateLShr(LHS, RHS);
return BinaryOperator::CreateExactLShr(LHS, RHS);
}
Instruction *CreateAShr(Constant *LHS, Constant *RHS,
bool isExact = false) const override {
if (!isExact)
return BinaryOperator::CreateAShr(LHS, RHS);
return BinaryOperator::CreateExactAShr(LHS, RHS);
}
Instruction *CreateXor(Constant *LHS, Constant *RHS) const override {
return BinaryOperator::CreateXor(LHS, RHS);
}
Instruction *CreateBinOp(Instruction::BinaryOps Opc,
Constant *LHS, Constant *RHS) const override {
return BinaryOperator::Create(Opc, LHS, RHS);
}
//===--------------------------------------------------------------------===//
// Unary Operators
//===--------------------------------------------------------------------===//
Instruction *CreateNeg(Constant *C,
bool HasNUW = false,
bool HasNSW = false) const override {
BinaryOperator *BO = BinaryOperator::CreateNeg(C);
if (HasNUW) BO->setHasNoUnsignedWrap();
if (HasNSW) BO->setHasNoSignedWrap();
return BO;
}
Instruction *CreateFNeg(Constant *C) const override {
return UnaryOperator::CreateFNeg(C);
}
Instruction *CreateNot(Constant *C) const override {
return BinaryOperator::CreateNot(C);
}
Instruction *CreateUnOp(Instruction::UnaryOps Opc,
Constant *C) const override {
return UnaryOperator::Create(Opc, C);
}
//===--------------------------------------------------------------------===//
// Cast/Conversion Operators
//===--------------------------------------------------------------------===//
Instruction *CreateCast(Instruction::CastOps Op, Constant *C,
Type *DestTy) const override {
return CastInst::Create(Op, C, DestTy);
}
Instruction *CreatePointerCast(Constant *C, Type *DestTy) const override {
return CastInst::CreatePointerCast(C, DestTy);
}
Instruction *CreatePointerBitCastOrAddrSpaceCast(
Constant *C, Type *DestTy) const override {
return CastInst::CreatePointerBitCastOrAddrSpaceCast(C, DestTy);
}
Instruction *CreateIntCast(Constant *C, Type *DestTy,
bool isSigned) const override {
return CastInst::CreateIntegerCast(C, DestTy, isSigned);
}
Instruction *CreateFPCast(Constant *C, Type *DestTy) const override {
return CastInst::CreateFPCast(C, DestTy);
}
Instruction *CreateBitCast(Constant *C, Type *DestTy) const override {
return CreateCast(Instruction::BitCast, C, DestTy);
}
Instruction *CreateIntToPtr(Constant *C, Type *DestTy) const override {
return CreateCast(Instruction::IntToPtr, C, DestTy);
}
Instruction *CreatePtrToInt(Constant *C, Type *DestTy) const override {
return CreateCast(Instruction::PtrToInt, C, DestTy);
}
Instruction *CreateZExtOrBitCast(Constant *C, Type *DestTy) const override {
return CastInst::CreateZExtOrBitCast(C, DestTy);
}
Instruction *CreateSExtOrBitCast(Constant *C, Type *DestTy) const override {
return CastInst::CreateSExtOrBitCast(C, DestTy);
}
Instruction *CreateTruncOrBitCast(Constant *C, Type *DestTy) const override {
return CastInst::CreateTruncOrBitCast(C, DestTy);
}
//===--------------------------------------------------------------------===//
// Compare Instructions
//===--------------------------------------------------------------------===//
Instruction *CreateFCmp(CmpInst::Predicate P,
Constant *LHS, Constant *RHS) const override {
return new FCmpInst(P, LHS, RHS);
}
//===--------------------------------------------------------------------===//
// Other Instructions
//===--------------------------------------------------------------------===//
Instruction *CreateExtractElement(Constant *Vec,
Constant *Idx) const override {
return ExtractElementInst::Create(Vec, Idx);
}
Instruction *CreateInsertElement(Constant *Vec, Constant *NewElt,
Constant *Idx) const override {
return InsertElementInst::Create(Vec, NewElt, Idx);
}
Instruction *CreateShuffleVector(Constant *V1, Constant *V2,
ArrayRef<int> Mask) const override {
return new ShuffleVectorInst(V1, V2, Mask);
}
Instruction *CreateExtractValue(Constant *Agg,
ArrayRef<unsigned> IdxList) const override {
return ExtractValueInst::Create(Agg, IdxList);
}
Instruction *CreateInsertValue(Constant *Agg, Constant *Val,
ArrayRef<unsigned> IdxList) const override {
return InsertValueInst::Create(Agg, Val, IdxList);
}
};
} // end namespace llvm
#endif // LLVM_IR_NOFOLDER_H
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