llvm/llvm/include/llvm/CodeGen/TargetLowering.h

//===- llvm/CodeGen/TargetLowering.h - Target Lowering Info -----*- 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file describes how to lower LLVM code to machine code.  This has two
/// main components:
///
///  1. Which ValueTypes are natively supported by the target.
///  2. Which operations are supported for supported ValueTypes.
///  3. Cost thresholds for alternative implementations of certain operations.
///
/// In addition it has a few other components, like information about FP
/// immediates.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_TARGETLOWERING_H
#define LLVM_CODEGEN_TARGETLOWERING_H

#include "llvm/ADT/APInt.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/CodeGen/DAGCombine.h"
#include "llvm/CodeGen/ISDOpcodes.h"
#include "llvm/CodeGen/LowLevelTypeUtils.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RuntimeLibcallUtil.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/CodeGen/TargetCallingConv.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGenTypes/MachineValueType.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/RuntimeLibcalls.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/Alignment.h"
#include "llvm/Support/AtomicOrdering.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include <algorithm>
#include <cassert>
#include <climits>
#include <cstdint>
#include <iterator>
#include <map>
#include <string>
#include <utility>
#include <vector>

namespace llvm {

class AssumptionCache;
class CCState;
class CCValAssign;
enum class ComplexDeinterleavingOperation;
enum class ComplexDeinterleavingRotation;
class Constant;
class FastISel;
class FunctionLoweringInfo;
class GlobalValue;
class Loop;
class GISelKnownBits;
class IntrinsicInst;
class IRBuilderBase;
struct KnownBits;
class LLVMContext;
class MachineBasicBlock;
class MachineFunction;
class MachineInstr;
class MachineJumpTableInfo;
class MachineLoop;
class MachineRegisterInfo;
class MCContext;
class MCExpr;
class Module;
class ProfileSummaryInfo;
class TargetLibraryInfo;
class TargetMachine;
class TargetRegisterClass;
class TargetRegisterInfo;
class TargetTransformInfo;
class Value;

namespace Sched {

enum Preference : uint8_t { … };

} // end namespace Sched

// MemOp models a memory operation, either memset or memcpy/memmove.
struct MemOp { … };

/// This base class for TargetLowering contains the SelectionDAG-independent
/// parts that can be used from the rest of CodeGen.
class TargetLoweringBase { … };

/// This class defines information used to lower LLVM code to legal SelectionDAG
/// operators that the target instruction selector can accept natively.
///
/// This class also defines callbacks that targets must implement to lower
/// target-specific constructs to SelectionDAG operators.
class TargetLowering : public TargetLoweringBase { … };

/// Given an LLVM IR type and return type attributes, compute the return value
/// EVTs and flags, and optionally also the offsets, if the return value is
/// being lowered to memory.
void GetReturnInfo(CallingConv::ID CC, Type *ReturnType, AttributeList attr,
                   SmallVectorImpl<ISD::OutputArg> &Outs,
                   const TargetLowering &TLI, const DataLayout &DL);

} // end namespace llvm

#endif // LLVM_CODEGEN_TARGETLOWERING_H