| //===- 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/FMF.h" |
| #include "llvm/IR/IRBuilderFolder.h" |
| #include "llvm/IR/InstrTypes.h" |
| #include "llvm/IR/Instruction.h" |
| #include "llvm/IR/Instructions.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 *FoldBinOp(Instruction::BinaryOps Opc, Value *LHS, |
| Value *RHS) const override { |
| return nullptr; |
| } |
| |
| Value *FoldExactBinOp(Instruction::BinaryOps Opc, Value *LHS, Value *RHS, |
| bool IsExact) const override { |
| return nullptr; |
| } |
| |
| Value *FoldNoWrapBinOp(Instruction::BinaryOps Opc, Value *LHS, Value *RHS, |
| bool HasNUW, bool HasNSW) const override { |
| return nullptr; |
| } |
| |
| Value *FoldBinOpFMF(Instruction::BinaryOps Opc, Value *LHS, Value *RHS, |
| FastMathFlags FMF) const override { |
| return nullptr; |
| } |
| |
| Value *FoldUnOpFMF(Instruction::UnaryOps Opc, Value *V, |
| FastMathFlags FMF) 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; |
| } |
| |
| Value *FoldExtractValue(Value *Agg, |
| ArrayRef<unsigned> IdxList) const override { |
| return nullptr; |
| } |
| |
| Value *FoldInsertValue(Value *Agg, Value *Val, |
| ArrayRef<unsigned> IdxList) const override { |
| return nullptr; |
| } |
| |
| Value *FoldExtractElement(Value *Vec, Value *Idx) const override { |
| return nullptr; |
| } |
| |
| Value *FoldInsertElement(Value *Vec, Value *NewElt, |
| Value *Idx) const override { |
| return nullptr; |
| } |
| |
| Value *FoldShuffleVector(Value *V1, Value *V2, |
| ArrayRef<int> Mask) const override { |
| return nullptr; |
| } |
| |
| //===--------------------------------------------------------------------===// |
| // 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); |
| } |
| }; |
| |
| } // end namespace llvm |
| |
| #endif // LLVM_IR_NOFOLDER_H |