1 //===-- SparcISelDAGToDAG.cpp - A dag to dag inst selector for Sparc ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines an instruction selector for the SPARC target.
12 //===----------------------------------------------------------------------===//
14 #include "SparcTargetMachine.h"
15 #include "llvm/CodeGen/SelectionDAGISel.h"
16 #include "llvm/IR/Intrinsics.h"
17 #include "llvm/Support/Compiler.h"
18 #include "llvm/Support/Debug.h"
19 #include "llvm/Support/ErrorHandling.h"
20 #include "llvm/Support/raw_ostream.h"
23 //===----------------------------------------------------------------------===//
24 // Instruction Selector Implementation
25 //===----------------------------------------------------------------------===//
27 //===--------------------------------------------------------------------===//
28 /// SparcDAGToDAGISel - SPARC specific code to select SPARC machine
29 /// instructions for SelectionDAG operations.
32 class SparcDAGToDAGISel : public SelectionDAGISel {
33 /// Subtarget - Keep a pointer to the Sparc Subtarget around so that we can
34 /// make the right decision when generating code for different targets.
35 const SparcSubtarget *Subtarget;
37 explicit SparcDAGToDAGISel(SparcTargetMachine &tm) : SelectionDAGISel(tm) {}
39 bool runOnMachineFunction(MachineFunction &MF) override {
40 Subtarget = &MF.getSubtarget<SparcSubtarget>();
41 return SelectionDAGISel::runOnMachineFunction(MF);
44 SDNode *Select(SDNode *N) override;
46 // Complex Pattern Selectors.
47 bool SelectADDRrr(SDValue N, SDValue &R1, SDValue &R2);
48 bool SelectADDRri(SDValue N, SDValue &Base, SDValue &Offset);
50 /// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
51 /// inline asm expressions.
52 bool SelectInlineAsmMemoryOperand(const SDValue &Op,
53 unsigned ConstraintID,
54 std::vector<SDValue> &OutOps) override;
56 const char *getPassName() const override {
57 return "SPARC DAG->DAG Pattern Instruction Selection";
60 // Include the pieces autogenerated from the target description.
61 #include "SparcGenDAGISel.inc"
64 SDNode* getGlobalBaseReg();
66 } // end anonymous namespace
68 SDNode* SparcDAGToDAGISel::getGlobalBaseReg() {
69 unsigned GlobalBaseReg = Subtarget->getInstrInfo()->getGlobalBaseReg(MF);
70 return CurDAG->getRegister(GlobalBaseReg, TLI->getPointerTy()).getNode();
73 bool SparcDAGToDAGISel::SelectADDRri(SDValue Addr,
74 SDValue &Base, SDValue &Offset) {
75 if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
76 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), TLI->getPointerTy());
77 Offset = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
80 if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
81 Addr.getOpcode() == ISD::TargetGlobalAddress ||
82 Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
83 return false; // direct calls.
85 if (Addr.getOpcode() == ISD::ADD) {
86 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1))) {
87 if (isInt<13>(CN->getSExtValue())) {
88 if (FrameIndexSDNode *FIN =
89 dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
90 // Constant offset from frame ref.
92 CurDAG->getTargetFrameIndex(FIN->getIndex(), TLI->getPointerTy());
94 Base = Addr.getOperand(0);
96 Offset = CurDAG->getTargetConstant(CN->getZExtValue(), SDLoc(Addr),
101 if (Addr.getOperand(0).getOpcode() == SPISD::Lo) {
102 Base = Addr.getOperand(1);
103 Offset = Addr.getOperand(0).getOperand(0);
106 if (Addr.getOperand(1).getOpcode() == SPISD::Lo) {
107 Base = Addr.getOperand(0);
108 Offset = Addr.getOperand(1).getOperand(0);
113 Offset = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
117 bool SparcDAGToDAGISel::SelectADDRrr(SDValue Addr, SDValue &R1, SDValue &R2) {
118 if (Addr.getOpcode() == ISD::FrameIndex) return false;
119 if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
120 Addr.getOpcode() == ISD::TargetGlobalAddress ||
121 Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
122 return false; // direct calls.
124 if (Addr.getOpcode() == ISD::ADD) {
125 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))
126 if (isInt<13>(CN->getSExtValue()))
127 return false; // Let the reg+imm pattern catch this!
128 if (Addr.getOperand(0).getOpcode() == SPISD::Lo ||
129 Addr.getOperand(1).getOpcode() == SPISD::Lo)
130 return false; // Let the reg+imm pattern catch this!
131 R1 = Addr.getOperand(0);
132 R2 = Addr.getOperand(1);
137 R2 = CurDAG->getRegister(SP::G0, TLI->getPointerTy());
141 SDNode *SparcDAGToDAGISel::Select(SDNode *N) {
143 if (N->isMachineOpcode()) {
145 return nullptr; // Already selected.
148 switch (N->getOpcode()) {
150 case SPISD::GLOBAL_BASE_REG:
151 return getGlobalBaseReg();
155 // sdivx / udivx handle 64-bit divides.
156 if (N->getValueType(0) == MVT::i64)
158 // FIXME: should use a custom expander to expose the SRA to the dag.
159 SDValue DivLHS = N->getOperand(0);
160 SDValue DivRHS = N->getOperand(1);
162 // Set the Y register to the high-part.
164 if (N->getOpcode() == ISD::SDIV) {
165 TopPart = SDValue(CurDAG->getMachineNode(SP::SRAri, dl, MVT::i32, DivLHS,
166 CurDAG->getTargetConstant(31, dl, MVT::i32)),
169 TopPart = CurDAG->getRegister(SP::G0, MVT::i32);
171 TopPart = SDValue(CurDAG->getMachineNode(SP::WRASRrr, dl, MVT::i32,
173 CurDAG->getRegister(SP::G0, MVT::i32)), 0);
174 TopPart = CurDAG->getCopyToReg(TopPart, dl, SP::Y, TopPart, SDValue()).getValue(1);
176 // FIXME: Handle div by immediate.
177 unsigned Opcode = N->getOpcode() == ISD::SDIV ? SP::SDIVrr : SP::UDIVrr;
178 return CurDAG->SelectNodeTo(N, Opcode, MVT::i32, DivLHS, DivRHS,
183 // FIXME: Handle mul by immediate.
184 SDValue MulLHS = N->getOperand(0);
185 SDValue MulRHS = N->getOperand(1);
186 unsigned Opcode = N->getOpcode() == ISD::MULHU ? SP::UMULrr : SP::SMULrr;
187 SDNode *Mul = CurDAG->getMachineNode(Opcode, dl, MVT::i32, MVT::Glue,
189 // The high part is in the Y register.
190 return CurDAG->SelectNodeTo(N, SP::RDASR, MVT::i32,
191 CurDAG->getRegister(SP::Y, MVT::i32),
196 return SelectCode(N);
200 /// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
201 /// inline asm expressions.
203 SparcDAGToDAGISel::SelectInlineAsmMemoryOperand(const SDValue &Op,
204 unsigned ConstraintID,
205 std::vector<SDValue> &OutOps) {
207 switch (ConstraintID) {
208 default: return true;
209 case InlineAsm::Constraint_i:
210 case InlineAsm::Constraint_m: // memory
211 if (!SelectADDRrr(Op, Op0, Op1))
212 SelectADDRri(Op, Op0, Op1);
216 OutOps.push_back(Op0);
217 OutOps.push_back(Op1);
221 /// createSparcISelDag - This pass converts a legalized DAG into a
222 /// SPARC-specific DAG, ready for instruction scheduling.
224 FunctionPass *llvm::createSparcISelDag(SparcTargetMachine &TM) {
225 return new SparcDAGToDAGISel(TM);