1 //===- AlphaInstrInfo.cpp - Alpha 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 Alpha implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
15 #include "AlphaInstrInfo.h"
16 #include "AlphaMachineFunctionInfo.h"
17 #include "AlphaGenInstrInfo.inc"
18 #include "llvm/CodeGen/MachineRegisterInfo.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/ADT/SmallVector.h"
21 #include "llvm/CodeGen/MachineInstrBuilder.h"
22 #include "llvm/Support/ErrorHandling.h"
25 AlphaInstrInfo::AlphaInstrInfo()
26 : TargetInstrInfoImpl(AlphaInsts, array_lengthof(AlphaInsts)),
30 bool AlphaInstrInfo::isMoveInstr(const MachineInstr& MI,
31 unsigned& sourceReg, unsigned& destReg,
32 unsigned& SrcSR, unsigned& DstSR) const {
33 unsigned oc = MI.getOpcode();
34 if (oc == Alpha::BISr ||
37 oc == Alpha::CPYSSt ||
38 oc == Alpha::CPYSTs) {
41 assert(MI.getNumOperands() >= 3 &&
42 MI.getOperand(0).isReg() &&
43 MI.getOperand(1).isReg() &&
44 MI.getOperand(2).isReg() &&
45 "invalid Alpha BIS instruction!");
46 if (MI.getOperand(1).getReg() == MI.getOperand(2).getReg()) {
47 sourceReg = MI.getOperand(1).getReg();
48 destReg = MI.getOperand(0).getReg();
57 AlphaInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
58 int &FrameIndex) const {
59 switch (MI->getOpcode()) {
66 if (MI->getOperand(1).isFI()) {
67 FrameIndex = MI->getOperand(1).getIndex();
68 return MI->getOperand(0).getReg();
76 AlphaInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
77 int &FrameIndex) const {
78 switch (MI->getOpcode()) {
85 if (MI->getOperand(1).isFI()) {
86 FrameIndex = MI->getOperand(1).getIndex();
87 return MI->getOperand(0).getReg();
94 static bool isAlphaIntCondCode(unsigned Opcode) {
110 unsigned AlphaInstrInfo::InsertBranch(MachineBasicBlock &MBB,
111 MachineBasicBlock *TBB,
112 MachineBasicBlock *FBB,
113 const SmallVectorImpl<MachineOperand> &Cond,
115 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
116 assert((Cond.size() == 2 || Cond.size() == 0) &&
117 "Alpha branch conditions have two components!");
121 if (Cond.empty()) // Unconditional branch
122 BuildMI(&MBB, DL, get(Alpha::BR)).addMBB(TBB);
123 else // Conditional branch
124 if (isAlphaIntCondCode(Cond[0].getImm()))
125 BuildMI(&MBB, DL, get(Alpha::COND_BRANCH_I))
126 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
128 BuildMI(&MBB, DL, get(Alpha::COND_BRANCH_F))
129 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
133 // Two-way Conditional Branch.
134 if (isAlphaIntCondCode(Cond[0].getImm()))
135 BuildMI(&MBB, DL, get(Alpha::COND_BRANCH_I))
136 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
138 BuildMI(&MBB, DL, get(Alpha::COND_BRANCH_F))
139 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
140 BuildMI(&MBB, DL, get(Alpha::BR)).addMBB(FBB);
144 void AlphaInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
145 MachineBasicBlock::iterator MI, DebugLoc DL,
146 unsigned DestReg, unsigned SrcReg,
147 bool KillSrc) const {
148 if (Alpha::GPRCRegClass.contains(DestReg, SrcReg)) {
149 BuildMI(MBB, MI, DL, get(Alpha::BISr), DestReg)
151 .addReg(SrcReg, getKillRegState(KillSrc));
152 } else if (Alpha::F4RCRegClass.contains(DestReg, SrcReg)) {
153 BuildMI(MBB, MI, DL, get(Alpha::CPYSS), DestReg)
155 .addReg(SrcReg, getKillRegState(KillSrc));
156 } else if (Alpha::F8RCRegClass.contains(DestReg, SrcReg)) {
157 BuildMI(MBB, MI, DL, get(Alpha::CPYST), DestReg)
159 .addReg(SrcReg, getKillRegState(KillSrc));
161 llvm_unreachable("Attempt to copy register that is not GPR or FPR");
166 AlphaInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
167 MachineBasicBlock::iterator MI,
168 unsigned SrcReg, bool isKill, int FrameIdx,
169 const TargetRegisterClass *RC,
170 const TargetRegisterInfo *TRI) const {
171 //cerr << "Trying to store " << getPrettyName(SrcReg) << " to "
172 // << FrameIdx << "\n";
173 //BuildMI(MBB, MI, Alpha::WTF, 0).addReg(SrcReg);
176 if (MI != MBB.end()) DL = MI->getDebugLoc();
178 if (RC == Alpha::F4RCRegisterClass)
179 BuildMI(MBB, MI, DL, get(Alpha::STS))
180 .addReg(SrcReg, getKillRegState(isKill))
181 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
182 else if (RC == Alpha::F8RCRegisterClass)
183 BuildMI(MBB, MI, DL, get(Alpha::STT))
184 .addReg(SrcReg, getKillRegState(isKill))
185 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
186 else if (RC == Alpha::GPRCRegisterClass)
187 BuildMI(MBB, MI, DL, get(Alpha::STQ))
188 .addReg(SrcReg, getKillRegState(isKill))
189 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
191 llvm_unreachable("Unhandled register class");
195 AlphaInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
196 MachineBasicBlock::iterator MI,
197 unsigned DestReg, int FrameIdx,
198 const TargetRegisterClass *RC,
199 const TargetRegisterInfo *TRI) const {
200 //cerr << "Trying to load " << getPrettyName(DestReg) << " to "
201 // << FrameIdx << "\n";
203 if (MI != MBB.end()) DL = MI->getDebugLoc();
205 if (RC == Alpha::F4RCRegisterClass)
206 BuildMI(MBB, MI, DL, get(Alpha::LDS), DestReg)
207 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
208 else if (RC == Alpha::F8RCRegisterClass)
209 BuildMI(MBB, MI, DL, get(Alpha::LDT), DestReg)
210 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
211 else if (RC == Alpha::GPRCRegisterClass)
212 BuildMI(MBB, MI, DL, get(Alpha::LDQ), DestReg)
213 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
215 llvm_unreachable("Unhandled register class");
218 static unsigned AlphaRevCondCode(unsigned Opcode) {
220 case Alpha::BEQ: return Alpha::BNE;
221 case Alpha::BNE: return Alpha::BEQ;
222 case Alpha::BGE: return Alpha::BLT;
223 case Alpha::BGT: return Alpha::BLE;
224 case Alpha::BLE: return Alpha::BGT;
225 case Alpha::BLT: return Alpha::BGE;
226 case Alpha::BLBC: return Alpha::BLBS;
227 case Alpha::BLBS: return Alpha::BLBC;
228 case Alpha::FBEQ: return Alpha::FBNE;
229 case Alpha::FBNE: return Alpha::FBEQ;
230 case Alpha::FBGE: return Alpha::FBLT;
231 case Alpha::FBGT: return Alpha::FBLE;
232 case Alpha::FBLE: return Alpha::FBGT;
233 case Alpha::FBLT: return Alpha::FBGE;
235 llvm_unreachable("Unknown opcode");
237 return 0; // Not reached
241 bool AlphaInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
242 MachineBasicBlock *&FBB,
243 SmallVectorImpl<MachineOperand> &Cond,
244 bool AllowModify) const {
245 // If the block has no terminators, it just falls into the block after it.
246 MachineBasicBlock::iterator I = MBB.end();
247 if (I == MBB.begin())
250 while (I->isDebugValue()) {
251 if (I == MBB.begin())
255 if (!isUnpredicatedTerminator(I))
258 // Get the last instruction in the block.
259 MachineInstr *LastInst = I;
261 // If there is only one terminator instruction, process it.
262 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
263 if (LastInst->getOpcode() == Alpha::BR) {
264 TBB = LastInst->getOperand(0).getMBB();
266 } else if (LastInst->getOpcode() == Alpha::COND_BRANCH_I ||
267 LastInst->getOpcode() == Alpha::COND_BRANCH_F) {
268 // Block ends with fall-through condbranch.
269 TBB = LastInst->getOperand(2).getMBB();
270 Cond.push_back(LastInst->getOperand(0));
271 Cond.push_back(LastInst->getOperand(1));
274 // Otherwise, don't know what this is.
278 // Get the instruction before it if it's a terminator.
279 MachineInstr *SecondLastInst = I;
281 // If there are three terminators, we don't know what sort of block this is.
282 if (SecondLastInst && I != MBB.begin() &&
283 isUnpredicatedTerminator(--I))
286 // If the block ends with Alpha::BR and Alpha::COND_BRANCH_*, handle it.
287 if ((SecondLastInst->getOpcode() == Alpha::COND_BRANCH_I ||
288 SecondLastInst->getOpcode() == Alpha::COND_BRANCH_F) &&
289 LastInst->getOpcode() == Alpha::BR) {
290 TBB = SecondLastInst->getOperand(2).getMBB();
291 Cond.push_back(SecondLastInst->getOperand(0));
292 Cond.push_back(SecondLastInst->getOperand(1));
293 FBB = LastInst->getOperand(0).getMBB();
297 // If the block ends with two Alpha::BRs, handle it. The second one is not
298 // executed, so remove it.
299 if (SecondLastInst->getOpcode() == Alpha::BR &&
300 LastInst->getOpcode() == Alpha::BR) {
301 TBB = SecondLastInst->getOperand(0).getMBB();
304 I->eraseFromParent();
308 // Otherwise, can't handle this.
312 unsigned AlphaInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
313 MachineBasicBlock::iterator I = MBB.end();
314 if (I == MBB.begin()) return 0;
316 while (I->isDebugValue()) {
317 if (I == MBB.begin())
321 if (I->getOpcode() != Alpha::BR &&
322 I->getOpcode() != Alpha::COND_BRANCH_I &&
323 I->getOpcode() != Alpha::COND_BRANCH_F)
326 // Remove the branch.
327 I->eraseFromParent();
331 if (I == MBB.begin()) return 1;
333 if (I->getOpcode() != Alpha::COND_BRANCH_I &&
334 I->getOpcode() != Alpha::COND_BRANCH_F)
337 // Remove the branch.
338 I->eraseFromParent();
342 void AlphaInstrInfo::insertNoop(MachineBasicBlock &MBB,
343 MachineBasicBlock::iterator MI) const {
345 BuildMI(MBB, MI, DL, get(Alpha::BISr), Alpha::R31)
350 bool AlphaInstrInfo::
351 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
352 assert(Cond.size() == 2 && "Invalid Alpha branch opcode!");
353 Cond[0].setImm(AlphaRevCondCode(Cond[0].getImm()));
357 /// getGlobalBaseReg - Return a virtual register initialized with the
358 /// the global base register value. Output instructions required to
359 /// initialize the register in the function entry block, if necessary.
361 unsigned AlphaInstrInfo::getGlobalBaseReg(MachineFunction *MF) const {
362 AlphaMachineFunctionInfo *AlphaFI = MF->getInfo<AlphaMachineFunctionInfo>();
363 unsigned GlobalBaseReg = AlphaFI->getGlobalBaseReg();
364 if (GlobalBaseReg != 0)
365 return GlobalBaseReg;
367 // Insert the set of GlobalBaseReg into the first MBB of the function
368 MachineBasicBlock &FirstMBB = MF->front();
369 MachineBasicBlock::iterator MBBI = FirstMBB.begin();
370 MachineRegisterInfo &RegInfo = MF->getRegInfo();
371 const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
373 GlobalBaseReg = RegInfo.createVirtualRegister(&Alpha::GPRCRegClass);
374 BuildMI(FirstMBB, MBBI, DebugLoc(), TII->get(TargetOpcode::COPY),
375 GlobalBaseReg).addReg(Alpha::R29);
376 RegInfo.addLiveIn(Alpha::R29);
378 AlphaFI->setGlobalBaseReg(GlobalBaseReg);
379 return GlobalBaseReg;
382 /// getGlobalRetAddr - Return a virtual register initialized with the
383 /// the global base register value. Output instructions required to
384 /// initialize the register in the function entry block, if necessary.
386 unsigned AlphaInstrInfo::getGlobalRetAddr(MachineFunction *MF) const {
387 AlphaMachineFunctionInfo *AlphaFI = MF->getInfo<AlphaMachineFunctionInfo>();
388 unsigned GlobalRetAddr = AlphaFI->getGlobalRetAddr();
389 if (GlobalRetAddr != 0)
390 return GlobalRetAddr;
392 // Insert the set of GlobalRetAddr into the first MBB of the function
393 MachineBasicBlock &FirstMBB = MF->front();
394 MachineBasicBlock::iterator MBBI = FirstMBB.begin();
395 MachineRegisterInfo &RegInfo = MF->getRegInfo();
396 const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
398 GlobalRetAddr = RegInfo.createVirtualRegister(&Alpha::GPRCRegClass);
399 BuildMI(FirstMBB, MBBI, DebugLoc(), TII->get(TargetOpcode::COPY),
400 GlobalRetAddr).addReg(Alpha::R26);
401 RegInfo.addLiveIn(Alpha::R26);
403 AlphaFI->setGlobalRetAddr(GlobalRetAddr);
404 return GlobalRetAddr;