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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
//===-- SparcISelDAGToDAG.cpp - A dag to dag inst selector for Sparc ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines an instruction selector for the SPARC target.
//
//===----------------------------------------------------------------------===//
#include "SparcTargetMachine.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// Instruction Selector Implementation
//===----------------------------------------------------------------------===//
//===--------------------------------------------------------------------===//
/// SparcDAGToDAGISel - SPARC specific code to select SPARC machine
/// instructions for SelectionDAG operations.
///
namespace {
class SparcDAGToDAGISel : public SelectionDAGISel {
/// Subtarget - Keep a pointer to the Sparc Subtarget around so that we can
/// make the right decision when generating code for different targets.
const SparcSubtarget *Subtarget;
public:
explicit SparcDAGToDAGISel(SparcTargetMachine &tm) : SelectionDAGISel(tm) {}
bool runOnMachineFunction(MachineFunction &MF) override {
Subtarget = &MF.getSubtarget<SparcSubtarget>();
return SelectionDAGISel::runOnMachineFunction(MF);
}
SDNode *Select(SDNode *N) override;
// Complex Pattern Selectors.
bool SelectADDRrr(SDValue N, SDValue &R1, SDValue &R2);
bool SelectADDRri(SDValue N, SDValue &Base, SDValue &Offset);
/// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
/// inline asm expressions.
bool SelectInlineAsmMemoryOperand(const SDValue &Op,
unsigned ConstraintID,
std::vector<SDValue> &OutOps) override;
const char *getPassName() const override {
return "SPARC DAG->DAG Pattern Instruction Selection";
}
// Include the pieces autogenerated from the target description.
#include "SparcGenDAGISel.inc"
private:
SDNode* getGlobalBaseReg();
};
} // end anonymous namespace
SDNode* SparcDAGToDAGISel::getGlobalBaseReg() {
unsigned GlobalBaseReg = Subtarget->getInstrInfo()->getGlobalBaseReg(MF);
return CurDAG->getRegister(GlobalBaseReg, TLI->getPointerTy()).getNode();
}
bool SparcDAGToDAGISel::SelectADDRri(SDValue Addr,
SDValue &Base, SDValue &Offset) {
if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), TLI->getPointerTy());
Offset = CurDAG->getTargetConstant(0, MVT::i32);
return true;
}
if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
Addr.getOpcode() == ISD::TargetGlobalAddress ||
Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
return false; // direct calls.
if (Addr.getOpcode() == ISD::ADD) {
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1))) {
if (isInt<13>(CN->getSExtValue())) {
if (FrameIndexSDNode *FIN =
dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
// Constant offset from frame ref.
Base =
CurDAG->getTargetFrameIndex(FIN->getIndex(), TLI->getPointerTy());
} else {
Base = Addr.getOperand(0);
}
Offset = CurDAG->getTargetConstant(CN->getZExtValue(), MVT::i32);
return true;
}
}
if (Addr.getOperand(0).getOpcode() == SPISD::Lo) {
Base = Addr.getOperand(1);
Offset = Addr.getOperand(0).getOperand(0);
return true;
}
if (Addr.getOperand(1).getOpcode() == SPISD::Lo) {
Base = Addr.getOperand(0);
Offset = Addr.getOperand(1).getOperand(0);
return true;
}
}
Base = Addr;
Offset = CurDAG->getTargetConstant(0, MVT::i32);
return true;
}
bool SparcDAGToDAGISel::SelectADDRrr(SDValue Addr, SDValue &R1, SDValue &R2) {
if (Addr.getOpcode() == ISD::FrameIndex) return false;
if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
Addr.getOpcode() == ISD::TargetGlobalAddress ||
Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
return false; // direct calls.
if (Addr.getOpcode() == ISD::ADD) {
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))
if (isInt<13>(CN->getSExtValue()))
return false; // Let the reg+imm pattern catch this!
if (Addr.getOperand(0).getOpcode() == SPISD::Lo ||
Addr.getOperand(1).getOpcode() == SPISD::Lo)
return false; // Let the reg+imm pattern catch this!
R1 = Addr.getOperand(0);
R2 = Addr.getOperand(1);
return true;
}
R1 = Addr;
R2 = CurDAG->getRegister(SP::G0, TLI->getPointerTy());
return true;
}
SDNode *SparcDAGToDAGISel::Select(SDNode *N) {
SDLoc dl(N);
if (N->isMachineOpcode()) {
N->setNodeId(-1);
return nullptr; // Already selected.
}
switch (N->getOpcode()) {
default: break;
case SPISD::GLOBAL_BASE_REG:
return getGlobalBaseReg();
case ISD::SDIV:
case ISD::UDIV: {
// sdivx / udivx handle 64-bit divides.
if (N->getValueType(0) == MVT::i64)
break;
// FIXME: should use a custom expander to expose the SRA to the dag.
SDValue DivLHS = N->getOperand(0);
SDValue DivRHS = N->getOperand(1);
// Set the Y register to the high-part.
SDValue TopPart;
if (N->getOpcode() == ISD::SDIV) {
TopPart = SDValue(CurDAG->getMachineNode(SP::SRAri, dl, MVT::i32, DivLHS,
CurDAG->getTargetConstant(31, MVT::i32)), 0);
} else {
TopPart = CurDAG->getRegister(SP::G0, MVT::i32);
}
TopPart = SDValue(CurDAG->getMachineNode(SP::WRYrr, dl, MVT::Glue, TopPart,
CurDAG->getRegister(SP::G0, MVT::i32)), 0);
// FIXME: Handle div by immediate.
unsigned Opcode = N->getOpcode() == ISD::SDIV ? SP::SDIVrr : SP::UDIVrr;
return CurDAG->SelectNodeTo(N, Opcode, MVT::i32, DivLHS, DivRHS,
TopPart);
}
case ISD::MULHU:
case ISD::MULHS: {
// FIXME: Handle mul by immediate.
SDValue MulLHS = N->getOperand(0);
SDValue MulRHS = N->getOperand(1);
unsigned Opcode = N->getOpcode() == ISD::MULHU ? SP::UMULrr : SP::SMULrr;
SDNode *Mul = CurDAG->getMachineNode(Opcode, dl, MVT::i32, MVT::Glue,
MulLHS, MulRHS);
// The high part is in the Y register.
return CurDAG->SelectNodeTo(N, SP::RDY, MVT::i32, SDValue(Mul, 1));
}
}
return SelectCode(N);
}
/// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
/// inline asm expressions.
bool
SparcDAGToDAGISel::SelectInlineAsmMemoryOperand(const SDValue &Op,
unsigned ConstraintID,
std::vector<SDValue> &OutOps) {
SDValue Op0, Op1;
switch (ConstraintID) {
default: return true;
case InlineAsm::Constraint_i:
case InlineAsm::Constraint_m: // memory
if (!SelectADDRrr(Op, Op0, Op1))
SelectADDRri(Op, Op0, Op1);
break;
}
OutOps.push_back(Op0);
OutOps.push_back(Op1);
return false;
}
/// createSparcISelDag - This pass converts a legalized DAG into a
/// SPARC-specific DAG, ready for instruction scheduling.
///
FunctionPass *llvm::createSparcISelDag(SparcTargetMachine &TM) {
return new SparcDAGToDAGISel(TM);
}
|
