1//===- ARCISelLowering.h - ARC DAG Lowering Interface -----------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines the interfaces that ARC uses to lower LLVM code into a
10// selection DAG.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_LIB_TARGET_ARC_ARCISELLOWERING_H
15#define LLVM_LIB_TARGET_ARC_ARCISELLOWERING_H
16
17#include "ARC.h"
18#include "llvm/CodeGen/SelectionDAG.h"
19#include "llvm/CodeGen/TargetLowering.h"
20
21namespace llvm {
22
23// Forward delcarations
24class ARCSubtarget;
25class ARCTargetMachine;
26
27namespace ARCISD {
28
29enum NodeType : unsigned {
30 // Start the numbering where the builtin ops and target ops leave off.
31 FIRST_NUMBER = ISD::BUILTIN_OP_END,
32
33 // Branch and link (call)
34 BL,
35
36 // Jump and link (indirect call)
37 JL,
38
39 // CMP
40 CMP,
41
42 // CMOV
43 CMOV,
44
45 // BRcc
46 BRcc,
47
48 // Global Address Wrapper
49 GAWRAPPER,
50
51 // return, (j_s [blink])
52 RET
53};
54
55} // end namespace ARCISD
56
57//===--------------------------------------------------------------------===//
58// TargetLowering Implementation
59//===--------------------------------------------------------------------===//
60class ARCTargetLowering : public TargetLowering {
61public:
62 explicit ARCTargetLowering(const TargetMachine &TM,
63 const ARCSubtarget &Subtarget);
64
65 /// Provide custom lowering hooks for some operations.
66 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
67
68 /// This method returns the name of a target specific DAG node.
69 const char *getTargetNodeName(unsigned Opcode) const override;
70
71 /// Return true if the addressing mode represented by AM is legal for this
72 /// target, for a load/store of the specified type.
73 bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
74 unsigned AS,
75 Instruction *I = nullptr) const override;
76
77private:
78 const ARCSubtarget &Subtarget;
79
80 void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue> &Results,
81 SelectionDAG &DAG) const override;
82
83 // Lower Operand helpers
84 SDValue LowerCallArguments(SDValue Chain, CallingConv::ID CallConv,
85 bool isVarArg,
86 const SmallVectorImpl<ISD::InputArg> &Ins,
87 SDLoc dl, SelectionDAG &DAG,
88 SmallVectorImpl<SDValue> &InVals) const;
89 // Lower Operand specifics
90 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
91 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
92 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
93 SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
94 SDValue LowerSIGN_EXTEND_INREG(SDValue Op, SelectionDAG &DAG) const;
95 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
96 SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
97
98 SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
99 bool isVarArg,
100 const SmallVectorImpl<ISD::InputArg> &Ins,
101 const SDLoc &dl, SelectionDAG &DAG,
102 SmallVectorImpl<SDValue> &InVals) const override;
103
104 SDValue LowerCall(TargetLowering::CallLoweringInfo &CLI,
105 SmallVectorImpl<SDValue> &InVals) const override;
106
107 SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
108 const SmallVectorImpl<ISD::OutputArg> &Outs,
109 const SmallVectorImpl<SDValue> &OutVals, const SDLoc &dl,
110 SelectionDAG &DAG) const override;
111
112 bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
113 bool isVarArg,
114 const SmallVectorImpl<ISD::OutputArg> &ArgsFlags,
115 LLVMContext &Context) const override;
116
117 bool mayBeEmittedAsTailCall(const CallInst *CI) const override;
118};
119
120} // end namespace llvm
121
122#endif // LLVM_LIB_TARGET_ARC_ARCISELLOWERING_H
123

source code of llvm/lib/Target/ARC/ARCISelLowering.h