1 //===- SparcInstrInfo.cpp - Sparc Instruction Information -------*- C++ -*-===//
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 contains the Sparc implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "SparcInstrInfo.h"
15 #include "SparcSubtarget.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/CodeGen/MachineInstrBuilder.h"
20 #include "llvm/CodeGen/MachineRegisterInfo.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "SparcGenInstrInfo.inc"
23 #include "SparcMachineFunctionInfo.h"
26 SparcInstrInfo::SparcInstrInfo(SparcSubtarget &ST)
27 : TargetInstrInfoImpl(SparcInsts, array_lengthof(SparcInsts)),
28 RI(ST, *this), Subtarget(ST) {
31 static bool isZeroImm(const MachineOperand &op) {
32 return op.isImm() && op.getImm() == 0;
35 /// Return true if the instruction is a register to register move and
36 /// leave the source and dest operands in the passed parameters.
38 bool SparcInstrInfo::isMoveInstr(const MachineInstr &MI,
39 unsigned &SrcReg, unsigned &DstReg,
40 unsigned &SrcSR, unsigned &DstSR) const {
41 SrcSR = DstSR = 0; // No sub-registers.
43 // We look for 3 kinds of patterns here:
46 // fmovs or FpMOVD (pseudo double move).
47 if (MI.getOpcode() == SP::ORrr || MI.getOpcode() == SP::ADDrr) {
48 if (MI.getOperand(1).getReg() == SP::G0) {
49 DstReg = MI.getOperand(0).getReg();
50 SrcReg = MI.getOperand(2).getReg();
52 } else if (MI.getOperand(2).getReg() == SP::G0) {
53 DstReg = MI.getOperand(0).getReg();
54 SrcReg = MI.getOperand(1).getReg();
57 } else if ((MI.getOpcode() == SP::ORri || MI.getOpcode() == SP::ADDri) &&
58 isZeroImm(MI.getOperand(2)) && MI.getOperand(1).isReg()) {
59 DstReg = MI.getOperand(0).getReg();
60 SrcReg = MI.getOperand(1).getReg();
62 } else if (MI.getOpcode() == SP::FMOVS || MI.getOpcode() == SP::FpMOVD ||
63 MI.getOpcode() == SP::FMOVD) {
64 SrcReg = MI.getOperand(1).getReg();
65 DstReg = MI.getOperand(0).getReg();
71 /// isLoadFromStackSlot - If the specified machine instruction is a direct
72 /// load from a stack slot, return the virtual or physical register number of
73 /// the destination along with the FrameIndex of the loaded stack slot. If
74 /// not, return 0. This predicate must return 0 if the instruction has
75 /// any side effects other than loading from the stack slot.
76 unsigned SparcInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
77 int &FrameIndex) const {
78 if (MI->getOpcode() == SP::LDri ||
79 MI->getOpcode() == SP::LDFri ||
80 MI->getOpcode() == SP::LDDFri) {
81 if (MI->getOperand(1).isFI() && MI->getOperand(2).isImm() &&
82 MI->getOperand(2).getImm() == 0) {
83 FrameIndex = MI->getOperand(1).getIndex();
84 return MI->getOperand(0).getReg();
90 /// isStoreToStackSlot - If the specified machine instruction is a direct
91 /// store to a stack slot, return the virtual or physical register number of
92 /// the source reg along with the FrameIndex of the loaded stack slot. If
93 /// not, return 0. This predicate must return 0 if the instruction has
94 /// any side effects other than storing to the stack slot.
95 unsigned SparcInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
96 int &FrameIndex) const {
97 if (MI->getOpcode() == SP::STri ||
98 MI->getOpcode() == SP::STFri ||
99 MI->getOpcode() == SP::STDFri) {
100 if (MI->getOperand(0).isFI() && MI->getOperand(1).isImm() &&
101 MI->getOperand(1).getImm() == 0) {
102 FrameIndex = MI->getOperand(0).getIndex();
103 return MI->getOperand(2).getReg();
110 SparcInstrInfo::InsertBranch(MachineBasicBlock &MBB,MachineBasicBlock *TBB,
111 MachineBasicBlock *FBB,
112 const SmallVectorImpl<MachineOperand> &Cond)const{
113 // FIXME this should probably take a DebugLoc argument
115 // Can only insert uncond branches so far.
116 assert(Cond.empty() && !FBB && TBB && "Can only handle uncond branches!");
117 BuildMI(&MBB, dl, get(SP::BA)).addMBB(TBB);
121 bool SparcInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
122 MachineBasicBlock::iterator I,
123 unsigned DestReg, unsigned SrcReg,
124 const TargetRegisterClass *DestRC,
125 const TargetRegisterClass *SrcRC) const {
126 if (DestRC != SrcRC) {
127 // Not yet supported!
132 if (I != MBB.end()) DL = I->getDebugLoc();
134 if (DestRC == SP::IntRegsRegisterClass)
135 BuildMI(MBB, I, DL, get(SP::ORrr), DestReg).addReg(SP::G0).addReg(SrcReg);
136 else if (DestRC == SP::FPRegsRegisterClass)
137 BuildMI(MBB, I, DL, get(SP::FMOVS), DestReg).addReg(SrcReg);
138 else if (DestRC == SP::DFPRegsRegisterClass)
139 BuildMI(MBB, I, DL, get(Subtarget.isV9() ? SP::FMOVD : SP::FpMOVD),DestReg)
142 // Can't copy this register
148 void SparcInstrInfo::
149 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
150 unsigned SrcReg, bool isKill, int FI,
151 const TargetRegisterClass *RC,
152 const TargetRegisterInfo *TRI) const {
154 if (I != MBB.end()) DL = I->getDebugLoc();
156 // On the order of operands here: think "[FrameIdx + 0] = SrcReg".
157 if (RC == SP::IntRegsRegisterClass)
158 BuildMI(MBB, I, DL, get(SP::STri)).addFrameIndex(FI).addImm(0)
159 .addReg(SrcReg, getKillRegState(isKill));
160 else if (RC == SP::FPRegsRegisterClass)
161 BuildMI(MBB, I, DL, get(SP::STFri)).addFrameIndex(FI).addImm(0)
162 .addReg(SrcReg, getKillRegState(isKill));
163 else if (RC == SP::DFPRegsRegisterClass)
164 BuildMI(MBB, I, DL, get(SP::STDFri)).addFrameIndex(FI).addImm(0)
165 .addReg(SrcReg, getKillRegState(isKill));
167 llvm_unreachable("Can't store this register to stack slot");
170 void SparcInstrInfo::
171 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
172 unsigned DestReg, int FI,
173 const TargetRegisterClass *RC,
174 const TargetRegisterInfo *TRI) const {
176 if (I != MBB.end()) DL = I->getDebugLoc();
178 if (RC == SP::IntRegsRegisterClass)
179 BuildMI(MBB, I, DL, get(SP::LDri), DestReg).addFrameIndex(FI).addImm(0);
180 else if (RC == SP::FPRegsRegisterClass)
181 BuildMI(MBB, I, DL, get(SP::LDFri), DestReg).addFrameIndex(FI).addImm(0);
182 else if (RC == SP::DFPRegsRegisterClass)
183 BuildMI(MBB, I, DL, get(SP::LDDFri), DestReg).addFrameIndex(FI).addImm(0);
185 llvm_unreachable("Can't load this register from stack slot");
188 MachineInstr *SparcInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
190 const SmallVectorImpl<unsigned> &Ops,
192 if (Ops.size() != 1) return NULL;
194 unsigned OpNum = Ops[0];
195 bool isFloat = false;
196 MachineInstr *NewMI = NULL;
197 switch (MI->getOpcode()) {
199 if (MI->getOperand(1).isReg() && MI->getOperand(1).getReg() == SP::G0&&
200 MI->getOperand(0).isReg() && MI->getOperand(2).isReg()) {
201 if (OpNum == 0) // COPY -> STORE
202 NewMI = BuildMI(MF, MI->getDebugLoc(), get(SP::STri))
205 .addReg(MI->getOperand(2).getReg());
207 NewMI = BuildMI(MF, MI->getDebugLoc(), get(SP::LDri),
208 MI->getOperand(0).getReg())
217 if (OpNum == 0) { // COPY -> STORE
218 unsigned SrcReg = MI->getOperand(1).getReg();
219 bool isKill = MI->getOperand(1).isKill();
220 bool isUndef = MI->getOperand(1).isUndef();
221 NewMI = BuildMI(MF, MI->getDebugLoc(),
222 get(isFloat ? SP::STFri : SP::STDFri))
225 .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef));
226 } else { // COPY -> LOAD
227 unsigned DstReg = MI->getOperand(0).getReg();
228 bool isDead = MI->getOperand(0).isDead();
229 bool isUndef = MI->getOperand(0).isUndef();
230 NewMI = BuildMI(MF, MI->getDebugLoc(),
231 get(isFloat ? SP::LDFri : SP::LDDFri))
232 .addReg(DstReg, RegState::Define |
233 getDeadRegState(isDead) | getUndefRegState(isUndef))
243 unsigned SparcInstrInfo::getGlobalBaseReg(MachineFunction *MF) const
245 SparcMachineFunctionInfo *SparcFI = MF->getInfo<SparcMachineFunctionInfo>();
246 unsigned GlobalBaseReg = SparcFI->getGlobalBaseReg();
247 if (GlobalBaseReg != 0)
248 return GlobalBaseReg;
250 // Insert the set of GlobalBaseReg into the first MBB of the function
251 MachineBasicBlock &FirstMBB = MF->front();
252 MachineBasicBlock::iterator MBBI = FirstMBB.begin();
253 MachineRegisterInfo &RegInfo = MF->getRegInfo();
255 GlobalBaseReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
260 BuildMI(FirstMBB, MBBI, dl, get(SP::GETPCX), GlobalBaseReg);
261 SparcFI->setGlobalBaseReg(GlobalBaseReg);
262 return GlobalBaseReg;