Viewing file:  NoFolder.h (4.3 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
//===- 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 *FoldCmp(CmpInst::Predicate P, Value *LHS, Value *RHS) const override {
return nullptr;
}
Value *FoldGEP(Type *Ty, Value *Ptr, ArrayRef<Value *> IdxList,
GEPNoWrapFlags NW) 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;
}
Value *FoldCast(Instruction::CastOps Op, Value *V,
Type *DestTy) const override {
return nullptr;
}
Value *FoldBinaryIntrinsic(Intrinsic::ID ID, Value *LHS, Value *RHS, Type *Ty,
Instruction *FMFSource) const override {
return nullptr;
}
//===--------------------------------------------------------------------===//
// Cast/Conversion Operators
//===--------------------------------------------------------------------===//
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);
}
};
} // end namespace llvm
#endif // LLVM_IR_NOFOLDER_H
|