1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
//===- InstrEmitter.h - Emit MachineInstrs for the SelectionDAG -*- 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 declares the Emit routines for the SelectionDAG class, which creates
// MachineInstrs based on the decisions of the SelectionDAG instruction
// selection.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_SELECTIONDAG_INSTREMITTER_H
#define LLVM_LIB_CODEGEN_SELECTIONDAG_INSTREMITTER_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
namespace llvm {
class MachineInstrBuilder;
class MCInstrDesc;
class SDDbgLabel;
class SDDbgValue;
class TargetLowering;
class TargetMachine;
class LLVM_LIBRARY_VISIBILITY InstrEmitter {
MachineFunction *MF;
MachineRegisterInfo *MRI;
const TargetInstrInfo *TII;
const TargetRegisterInfo *TRI;
const TargetLowering *TLI;
MachineBasicBlock *MBB;
MachineBasicBlock::iterator InsertPos;
/// Should we try to produce DBG_INSTR_REF instructions?
bool EmitDebugInstrRefs;
/// EmitCopyFromReg - Generate machine code for an CopyFromReg node or an
/// implicit physical register output.
void EmitCopyFromReg(SDNode *Node, unsigned ResNo,
bool IsClone, bool IsCloned,
Register SrcReg,
DenseMap<SDValue, Register> &VRBaseMap);
void CreateVirtualRegisters(SDNode *Node,
MachineInstrBuilder &MIB,
const MCInstrDesc &II,
bool IsClone, bool IsCloned,
DenseMap<SDValue, Register> &VRBaseMap);
/// getVR - Return the virtual register corresponding to the specified result
/// of the specified node.
Register getVR(SDValue Op,
DenseMap<SDValue, Register> &VRBaseMap);
/// AddRegisterOperand - Add the specified register as an operand to the
/// specified machine instr. Insert register copies if the register is
/// not in the required register class.
void AddRegisterOperand(MachineInstrBuilder &MIB,
SDValue Op,
unsigned IIOpNum,
const MCInstrDesc *II,
DenseMap<SDValue, Register> &VRBaseMap,
bool IsDebug, bool IsClone, bool IsCloned);
/// AddOperand - Add the specified operand to the specified machine instr. II
/// specifies the instruction information for the node, and IIOpNum is the
/// operand number (in the II) that we are adding. IIOpNum and II are used for
/// assertions only.
void AddOperand(MachineInstrBuilder &MIB,
SDValue Op,
unsigned IIOpNum,
const MCInstrDesc *II,
DenseMap<SDValue, Register> &VRBaseMap,
bool IsDebug, bool IsClone, bool IsCloned);
/// ConstrainForSubReg - Try to constrain VReg to a register class that
/// supports SubIdx sub-registers. Emit a copy if that isn't possible.
/// Return the virtual register to use.
Register ConstrainForSubReg(Register VReg, unsigned SubIdx, MVT VT,
bool isDivergent, const DebugLoc &DL);
/// EmitSubregNode - Generate machine code for subreg nodes.
///
void EmitSubregNode(SDNode *Node, DenseMap<SDValue, Register> &VRBaseMap,
bool IsClone, bool IsCloned);
/// EmitCopyToRegClassNode - Generate machine code for COPY_TO_REGCLASS nodes.
/// COPY_TO_REGCLASS is just a normal copy, except that the destination
/// register is constrained to be in a particular register class.
///
void EmitCopyToRegClassNode(SDNode *Node,
DenseMap<SDValue, Register> &VRBaseMap);
/// EmitRegSequence - Generate machine code for REG_SEQUENCE nodes.
///
void EmitRegSequence(SDNode *Node, DenseMap<SDValue, Register> &VRBaseMap,
bool IsClone, bool IsCloned);
public:
/// CountResults - The results of target nodes have register or immediate
/// operands first, then an optional chain, and optional flag operands
/// (which do not go into the machine instrs.)
static unsigned CountResults(SDNode *Node);
/// EmitDbgValue - Generate machine instruction for a dbg_value node.
///
MachineInstr *EmitDbgValue(SDDbgValue *SD,
DenseMap<SDValue, Register> &VRBaseMap);
/// Attempt to emit a dbg_value as a DBG_INSTR_REF. May fail and return
/// nullptr, in which case we fall back to plain EmitDbgValue.
MachineInstr *EmitDbgInstrRef(SDDbgValue *SD,
DenseMap<SDValue, Register> &VRBaseMap);
/// Generate machine instruction for a dbg_label node.
MachineInstr *EmitDbgLabel(SDDbgLabel *SD);
/// EmitNode - Generate machine code for a node and needed dependencies.
///
void EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
DenseMap<SDValue, Register> &VRBaseMap) {
if (Node->isMachineOpcode())
EmitMachineNode(Node, IsClone, IsCloned, VRBaseMap);
else
EmitSpecialNode(Node, IsClone, IsCloned, VRBaseMap);
}
/// getBlock - Return the current basic block.
MachineBasicBlock *getBlock() { return MBB; }
/// getInsertPos - Return the current insertion position.
MachineBasicBlock::iterator getInsertPos() { return InsertPos; }
/// InstrEmitter - Construct an InstrEmitter and set it to start inserting
/// at the given position in the given block.
InstrEmitter(const TargetMachine &TM, MachineBasicBlock *mbb,
MachineBasicBlock::iterator insertpos);
private:
void EmitMachineNode(SDNode *Node, bool IsClone, bool IsCloned,
DenseMap<SDValue, Register> &VRBaseMap);
void EmitSpecialNode(SDNode *Node, bool IsClone, bool IsCloned,
DenseMap<SDValue, Register> &VRBaseMap);
};
}
#endif
|
