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 bool AlphaInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
145 MachineBasicBlock::iterator MI,
146 unsigned DestReg, unsigned SrcReg,
147 const TargetRegisterClass *DestRC,
148 const TargetRegisterClass *SrcRC,
150 //cerr << "copyRegToReg " << DestReg << " <- " << SrcReg << "\n";
151 if (DestRC != SrcRC) {
152 // Not yet supported!
156 if (DestRC == Alpha::GPRCRegisterClass) {
157 BuildMI(MBB, MI, DL, get(Alpha::BISr), DestReg)
160 } else if (DestRC == Alpha::F4RCRegisterClass) {
161 BuildMI(MBB, MI, DL, get(Alpha::CPYSS), DestReg)
164 } else if (DestRC == Alpha::F8RCRegisterClass) {
165 BuildMI(MBB, MI, DL, get(Alpha::CPYST), DestReg)
169 // Attempt to copy register that is not GPR or FPR
177 AlphaInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
178 MachineBasicBlock::iterator MI,
179 unsigned SrcReg, bool isKill, int FrameIdx,
180 const TargetRegisterClass *RC,
181 const TargetRegisterInfo *TRI) const {
182 //cerr << "Trying to store " << getPrettyName(SrcReg) << " to "
183 // << FrameIdx << "\n";
184 //BuildMI(MBB, MI, Alpha::WTF, 0).addReg(SrcReg);
187 if (MI != MBB.end()) DL = MI->getDebugLoc();
189 if (RC == Alpha::F4RCRegisterClass)
190 BuildMI(MBB, MI, DL, get(Alpha::STS))
191 .addReg(SrcReg, getKillRegState(isKill))
192 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
193 else if (RC == Alpha::F8RCRegisterClass)
194 BuildMI(MBB, MI, DL, get(Alpha::STT))
195 .addReg(SrcReg, getKillRegState(isKill))
196 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
197 else if (RC == Alpha::GPRCRegisterClass)
198 BuildMI(MBB, MI, DL, get(Alpha::STQ))
199 .addReg(SrcReg, getKillRegState(isKill))
200 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
202 llvm_unreachable("Unhandled register class");
206 AlphaInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
207 MachineBasicBlock::iterator MI,
208 unsigned DestReg, int FrameIdx,
209 const TargetRegisterClass *RC,
210 const TargetRegisterInfo *TRI) const {
211 //cerr << "Trying to load " << getPrettyName(DestReg) << " to "
212 // << FrameIdx << "\n";
214 if (MI != MBB.end()) DL = MI->getDebugLoc();
216 if (RC == Alpha::F4RCRegisterClass)
217 BuildMI(MBB, MI, DL, get(Alpha::LDS), DestReg)
218 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
219 else if (RC == Alpha::F8RCRegisterClass)
220 BuildMI(MBB, MI, DL, get(Alpha::LDT), DestReg)
221 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
222 else if (RC == Alpha::GPRCRegisterClass)
223 BuildMI(MBB, MI, DL, get(Alpha::LDQ), DestReg)
224 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
226 llvm_unreachable("Unhandled register class");
229 MachineInstr *AlphaInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
231 const SmallVectorImpl<unsigned> &Ops,
232 int FrameIndex) const {
233 if (Ops.size() != 1) return NULL;
235 // Make sure this is a reg-reg copy.
236 unsigned Opc = MI->getOpcode();
238 MachineInstr *NewMI = NULL;
245 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
246 if (Ops[0] == 0) { // move -> store
247 unsigned InReg = MI->getOperand(1).getReg();
248 bool isKill = MI->getOperand(1).isKill();
249 bool isUndef = MI->getOperand(1).isUndef();
250 Opc = (Opc == Alpha::BISr) ? Alpha::STQ :
251 ((Opc == Alpha::CPYSS) ? Alpha::STS : Alpha::STT);
252 NewMI = BuildMI(MF, MI->getDebugLoc(), get(Opc))
253 .addReg(InReg, getKillRegState(isKill) | getUndefRegState(isUndef))
254 .addFrameIndex(FrameIndex)
256 } else { // load -> move
257 unsigned OutReg = MI->getOperand(0).getReg();
258 bool isDead = MI->getOperand(0).isDead();
259 bool isUndef = MI->getOperand(0).isUndef();
260 Opc = (Opc == Alpha::BISr) ? Alpha::LDQ :
261 ((Opc == Alpha::CPYSS) ? Alpha::LDS : Alpha::LDT);
262 NewMI = BuildMI(MF, MI->getDebugLoc(), get(Opc))
263 .addReg(OutReg, RegState::Define | getDeadRegState(isDead) |
264 getUndefRegState(isUndef))
265 .addFrameIndex(FrameIndex)
274 static unsigned AlphaRevCondCode(unsigned Opcode) {
276 case Alpha::BEQ: return Alpha::BNE;
277 case Alpha::BNE: return Alpha::BEQ;
278 case Alpha::BGE: return Alpha::BLT;
279 case Alpha::BGT: return Alpha::BLE;
280 case Alpha::BLE: return Alpha::BGT;
281 case Alpha::BLT: return Alpha::BGE;
282 case Alpha::BLBC: return Alpha::BLBS;
283 case Alpha::BLBS: return Alpha::BLBC;
284 case Alpha::FBEQ: return Alpha::FBNE;
285 case Alpha::FBNE: return Alpha::FBEQ;
286 case Alpha::FBGE: return Alpha::FBLT;
287 case Alpha::FBGT: return Alpha::FBLE;
288 case Alpha::FBLE: return Alpha::FBGT;
289 case Alpha::FBLT: return Alpha::FBGE;
291 llvm_unreachable("Unknown opcode");
293 return 0; // Not reached
297 bool AlphaInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
298 MachineBasicBlock *&FBB,
299 SmallVectorImpl<MachineOperand> &Cond,
300 bool AllowModify) const {
301 // If the block has no terminators, it just falls into the block after it.
302 MachineBasicBlock::iterator I = MBB.end();
303 if (I == MBB.begin())
306 while (I->isDebugValue()) {
307 if (I == MBB.begin())
311 if (!isUnpredicatedTerminator(I))
314 // Get the last instruction in the block.
315 MachineInstr *LastInst = I;
317 // If there is only one terminator instruction, process it.
318 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
319 if (LastInst->getOpcode() == Alpha::BR) {
320 TBB = LastInst->getOperand(0).getMBB();
322 } else if (LastInst->getOpcode() == Alpha::COND_BRANCH_I ||
323 LastInst->getOpcode() == Alpha::COND_BRANCH_F) {
324 // Block ends with fall-through condbranch.
325 TBB = LastInst->getOperand(2).getMBB();
326 Cond.push_back(LastInst->getOperand(0));
327 Cond.push_back(LastInst->getOperand(1));
330 // Otherwise, don't know what this is.
334 // Get the instruction before it if it's a terminator.
335 MachineInstr *SecondLastInst = I;
337 // If there are three terminators, we don't know what sort of block this is.
338 if (SecondLastInst && I != MBB.begin() &&
339 isUnpredicatedTerminator(--I))
342 // If the block ends with Alpha::BR and Alpha::COND_BRANCH_*, handle it.
343 if ((SecondLastInst->getOpcode() == Alpha::COND_BRANCH_I ||
344 SecondLastInst->getOpcode() == Alpha::COND_BRANCH_F) &&
345 LastInst->getOpcode() == Alpha::BR) {
346 TBB = SecondLastInst->getOperand(2).getMBB();
347 Cond.push_back(SecondLastInst->getOperand(0));
348 Cond.push_back(SecondLastInst->getOperand(1));
349 FBB = LastInst->getOperand(0).getMBB();
353 // If the block ends with two Alpha::BRs, handle it. The second one is not
354 // executed, so remove it.
355 if (SecondLastInst->getOpcode() == Alpha::BR &&
356 LastInst->getOpcode() == Alpha::BR) {
357 TBB = SecondLastInst->getOperand(0).getMBB();
360 I->eraseFromParent();
364 // Otherwise, can't handle this.
368 unsigned AlphaInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
369 MachineBasicBlock::iterator I = MBB.end();
370 if (I == MBB.begin()) return 0;
372 while (I->isDebugValue()) {
373 if (I == MBB.begin())
377 if (I->getOpcode() != Alpha::BR &&
378 I->getOpcode() != Alpha::COND_BRANCH_I &&
379 I->getOpcode() != Alpha::COND_BRANCH_F)
382 // Remove the branch.
383 I->eraseFromParent();
387 if (I == MBB.begin()) return 1;
389 if (I->getOpcode() != Alpha::COND_BRANCH_I &&
390 I->getOpcode() != Alpha::COND_BRANCH_F)
393 // Remove the branch.
394 I->eraseFromParent();
398 void AlphaInstrInfo::insertNoop(MachineBasicBlock &MBB,
399 MachineBasicBlock::iterator MI) const {
401 BuildMI(MBB, MI, DL, get(Alpha::BISr), Alpha::R31)
406 bool AlphaInstrInfo::
407 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
408 assert(Cond.size() == 2 && "Invalid Alpha branch opcode!");
409 Cond[0].setImm(AlphaRevCondCode(Cond[0].getImm()));
413 /// getGlobalBaseReg - Return a virtual register initialized with the
414 /// the global base register value. Output instructions required to
415 /// initialize the register in the function entry block, if necessary.
417 unsigned AlphaInstrInfo::getGlobalBaseReg(MachineFunction *MF) const {
418 AlphaMachineFunctionInfo *AlphaFI = MF->getInfo<AlphaMachineFunctionInfo>();
419 unsigned GlobalBaseReg = AlphaFI->getGlobalBaseReg();
420 if (GlobalBaseReg != 0)
421 return GlobalBaseReg;
423 // Insert the set of GlobalBaseReg into the first MBB of the function
424 MachineBasicBlock &FirstMBB = MF->front();
425 MachineBasicBlock::iterator MBBI = FirstMBB.begin();
426 MachineRegisterInfo &RegInfo = MF->getRegInfo();
427 const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
429 GlobalBaseReg = RegInfo.createVirtualRegister(&Alpha::GPRCRegClass);
430 bool Ok = TII->copyRegToReg(FirstMBB, MBBI, GlobalBaseReg, Alpha::R29,
431 &Alpha::GPRCRegClass, &Alpha::GPRCRegClass,
433 assert(Ok && "Couldn't assign to global base register!");
434 Ok = Ok; // Silence warning when assertions are turned off.
435 RegInfo.addLiveIn(Alpha::R29);
437 AlphaFI->setGlobalBaseReg(GlobalBaseReg);
438 return GlobalBaseReg;
441 /// getGlobalRetAddr - Return a virtual register initialized with the
442 /// the global base register value. Output instructions required to
443 /// initialize the register in the function entry block, if necessary.
445 unsigned AlphaInstrInfo::getGlobalRetAddr(MachineFunction *MF) const {
446 AlphaMachineFunctionInfo *AlphaFI = MF->getInfo<AlphaMachineFunctionInfo>();
447 unsigned GlobalRetAddr = AlphaFI->getGlobalRetAddr();
448 if (GlobalRetAddr != 0)
449 return GlobalRetAddr;
451 // Insert the set of GlobalRetAddr into the first MBB of the function
452 MachineBasicBlock &FirstMBB = MF->front();
453 MachineBasicBlock::iterator MBBI = FirstMBB.begin();
454 MachineRegisterInfo &RegInfo = MF->getRegInfo();
455 const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
457 GlobalRetAddr = RegInfo.createVirtualRegister(&Alpha::GPRCRegClass);
458 bool Ok = TII->copyRegToReg(FirstMBB, MBBI, GlobalRetAddr, Alpha::R26,
459 &Alpha::GPRCRegClass, &Alpha::GPRCRegClass,
461 assert(Ok && "Couldn't assign to global return address register!");
462 Ok = Ok; // Silence warning when assertions are turned off.
463 RegInfo.addLiveIn(Alpha::R26);
465 AlphaFI->setGlobalRetAddr(GlobalRetAddr);
466 return GlobalRetAddr;