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 "AlphaGenInstrInfo.inc"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/CodeGen/MachineInstrBuilder.h"
22 AlphaInstrInfo::AlphaInstrInfo()
23 : TargetInstrInfoImpl(AlphaInsts, array_lengthof(AlphaInsts)),
27 bool AlphaInstrInfo::isMoveInstr(const MachineInstr& MI,
29 unsigned& destReg) const {
30 unsigned oc = MI.getOpcode();
31 if (oc == Alpha::BISr ||
34 oc == Alpha::CPYSSt ||
35 oc == Alpha::CPYSTs) {
38 assert(MI.getNumOperands() >= 3 &&
39 MI.getOperand(0).isReg() &&
40 MI.getOperand(1).isReg() &&
41 MI.getOperand(2).isReg() &&
42 "invalid Alpha BIS instruction!");
43 if (MI.getOperand(1).getReg() == MI.getOperand(2).getReg()) {
44 sourceReg = MI.getOperand(1).getReg();
45 destReg = MI.getOperand(0).getReg();
53 AlphaInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
54 int &FrameIndex) const {
55 switch (MI->getOpcode()) {
62 if (MI->getOperand(1).isFI()) {
63 FrameIndex = MI->getOperand(1).getIndex();
64 return MI->getOperand(0).getReg();
72 AlphaInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
73 int &FrameIndex) const {
74 switch (MI->getOpcode()) {
81 if (MI->getOperand(1).isFI()) {
82 FrameIndex = MI->getOperand(1).getIndex();
83 return MI->getOperand(0).getReg();
90 static bool isAlphaIntCondCode(unsigned Opcode) {
106 unsigned AlphaInstrInfo::InsertBranch(MachineBasicBlock &MBB,
107 MachineBasicBlock *TBB,
108 MachineBasicBlock *FBB,
109 const SmallVectorImpl<MachineOperand> &Cond) const {
110 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
111 assert((Cond.size() == 2 || Cond.size() == 0) &&
112 "Alpha branch conditions have two components!");
116 if (Cond.empty()) // Unconditional branch
117 BuildMI(&MBB, get(Alpha::BR)).addMBB(TBB);
118 else // Conditional branch
119 if (isAlphaIntCondCode(Cond[0].getImm()))
120 BuildMI(&MBB, get(Alpha::COND_BRANCH_I))
121 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
123 BuildMI(&MBB, get(Alpha::COND_BRANCH_F))
124 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
128 // Two-way Conditional Branch.
129 if (isAlphaIntCondCode(Cond[0].getImm()))
130 BuildMI(&MBB, get(Alpha::COND_BRANCH_I))
131 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
133 BuildMI(&MBB, get(Alpha::COND_BRANCH_F))
134 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
135 BuildMI(&MBB, get(Alpha::BR)).addMBB(FBB);
139 bool AlphaInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
140 MachineBasicBlock::iterator MI,
141 unsigned DestReg, unsigned SrcReg,
142 const TargetRegisterClass *DestRC,
143 const TargetRegisterClass *SrcRC) const {
144 //cerr << "copyRegToReg " << DestReg << " <- " << SrcReg << "\n";
145 if (DestRC != SrcRC) {
146 // Not yet supported!
150 if (DestRC == Alpha::GPRCRegisterClass) {
151 BuildMI(MBB, MI, get(Alpha::BISr), DestReg).addReg(SrcReg).addReg(SrcReg);
152 } else if (DestRC == Alpha::F4RCRegisterClass) {
153 BuildMI(MBB, MI, get(Alpha::CPYSS), DestReg).addReg(SrcReg).addReg(SrcReg);
154 } else if (DestRC == Alpha::F8RCRegisterClass) {
155 BuildMI(MBB, MI, get(Alpha::CPYST), DestReg).addReg(SrcReg).addReg(SrcReg);
157 // Attempt to copy register that is not GPR or FPR
165 AlphaInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
166 MachineBasicBlock::iterator MI,
167 unsigned SrcReg, bool isKill, int FrameIdx,
168 const TargetRegisterClass *RC) const {
169 //cerr << "Trying to store " << getPrettyName(SrcReg) << " to "
170 // << FrameIdx << "\n";
171 //BuildMI(MBB, MI, Alpha::WTF, 0).addReg(SrcReg);
172 if (RC == Alpha::F4RCRegisterClass)
173 BuildMI(MBB, MI, get(Alpha::STS))
174 .addReg(SrcReg, false, false, isKill)
175 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
176 else if (RC == Alpha::F8RCRegisterClass)
177 BuildMI(MBB, MI, get(Alpha::STT))
178 .addReg(SrcReg, false, false, isKill)
179 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
180 else if (RC == Alpha::GPRCRegisterClass)
181 BuildMI(MBB, MI, get(Alpha::STQ))
182 .addReg(SrcReg, false, false, isKill)
183 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
188 void AlphaInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
190 SmallVectorImpl<MachineOperand> &Addr,
191 const TargetRegisterClass *RC,
192 SmallVectorImpl<MachineInstr*> &NewMIs) const {
194 if (RC == Alpha::F4RCRegisterClass)
196 else if (RC == Alpha::F8RCRegisterClass)
198 else if (RC == Alpha::GPRCRegisterClass)
202 MachineInstrBuilder MIB =
203 BuildMI(MF, get(Opc)).addReg(SrcReg, false, false, isKill);
204 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
205 MachineOperand &MO = Addr[i];
207 MIB.addReg(MO.getReg(), MO.isDef(), MO.isImplicit());
209 MIB.addImm(MO.getImm());
211 NewMIs.push_back(MIB);
215 AlphaInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
216 MachineBasicBlock::iterator MI,
217 unsigned DestReg, int FrameIdx,
218 const TargetRegisterClass *RC) const {
219 //cerr << "Trying to load " << getPrettyName(DestReg) << " to "
220 // << FrameIdx << "\n";
221 if (RC == Alpha::F4RCRegisterClass)
222 BuildMI(MBB, MI, get(Alpha::LDS), DestReg)
223 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
224 else if (RC == Alpha::F8RCRegisterClass)
225 BuildMI(MBB, MI, get(Alpha::LDT), DestReg)
226 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
227 else if (RC == Alpha::GPRCRegisterClass)
228 BuildMI(MBB, MI, get(Alpha::LDQ), DestReg)
229 .addFrameIndex(FrameIdx).addReg(Alpha::F31);
234 void AlphaInstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
235 SmallVectorImpl<MachineOperand> &Addr,
236 const TargetRegisterClass *RC,
237 SmallVectorImpl<MachineInstr*> &NewMIs) const {
239 if (RC == Alpha::F4RCRegisterClass)
241 else if (RC == Alpha::F8RCRegisterClass)
243 else if (RC == Alpha::GPRCRegisterClass)
247 MachineInstrBuilder MIB =
248 BuildMI(MF, get(Opc), DestReg);
249 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
250 MachineOperand &MO = Addr[i];
252 MIB.addReg(MO.getReg(), MO.isDef(), MO.isImplicit());
254 MIB.addImm(MO.getImm());
256 NewMIs.push_back(MIB);
259 MachineInstr *AlphaInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
261 const SmallVectorImpl<unsigned> &Ops,
262 int FrameIndex) const {
263 if (Ops.size() != 1) return NULL;
265 // Make sure this is a reg-reg copy.
266 unsigned Opc = MI->getOpcode();
268 MachineInstr *NewMI = NULL;
275 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
276 if (Ops[0] == 0) { // move -> store
277 unsigned InReg = MI->getOperand(1).getReg();
278 bool isKill = MI->getOperand(1).isKill();
279 Opc = (Opc == Alpha::BISr) ? Alpha::STQ :
280 ((Opc == Alpha::CPYSS) ? Alpha::STS : Alpha::STT);
281 NewMI = BuildMI(MF, get(Opc)).addReg(InReg, false, false, isKill)
282 .addFrameIndex(FrameIndex)
284 } else { // load -> move
285 unsigned OutReg = MI->getOperand(0).getReg();
286 bool isDead = MI->getOperand(0).isDead();
287 Opc = (Opc == Alpha::BISr) ? Alpha::LDQ :
288 ((Opc == Alpha::CPYSS) ? Alpha::LDS : Alpha::LDT);
289 NewMI = BuildMI(MF, get(Opc)).addReg(OutReg, true, false, false, isDead)
290 .addFrameIndex(FrameIndex)
299 static unsigned AlphaRevCondCode(unsigned Opcode) {
301 case Alpha::BEQ: return Alpha::BNE;
302 case Alpha::BNE: return Alpha::BEQ;
303 case Alpha::BGE: return Alpha::BLT;
304 case Alpha::BGT: return Alpha::BLE;
305 case Alpha::BLE: return Alpha::BGT;
306 case Alpha::BLT: return Alpha::BGE;
307 case Alpha::BLBC: return Alpha::BLBS;
308 case Alpha::BLBS: return Alpha::BLBC;
309 case Alpha::FBEQ: return Alpha::FBNE;
310 case Alpha::FBNE: return Alpha::FBEQ;
311 case Alpha::FBGE: return Alpha::FBLT;
312 case Alpha::FBGT: return Alpha::FBLE;
313 case Alpha::FBLE: return Alpha::FBGT;
314 case Alpha::FBLT: return Alpha::FBGE;
316 assert(0 && "Unknown opcode");
318 return 0; // Not reached
322 bool AlphaInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
323 MachineBasicBlock *&FBB,
324 SmallVectorImpl<MachineOperand> &Cond) const {
325 // If the block has no terminators, it just falls into the block after it.
326 MachineBasicBlock::iterator I = MBB.end();
327 if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
330 // Get the last instruction in the block.
331 MachineInstr *LastInst = I;
333 // If there is only one terminator instruction, process it.
334 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
335 if (LastInst->getOpcode() == Alpha::BR) {
336 TBB = LastInst->getOperand(0).getMBB();
338 } else if (LastInst->getOpcode() == Alpha::COND_BRANCH_I ||
339 LastInst->getOpcode() == Alpha::COND_BRANCH_F) {
340 // Block ends with fall-through condbranch.
341 TBB = LastInst->getOperand(2).getMBB();
342 Cond.push_back(LastInst->getOperand(0));
343 Cond.push_back(LastInst->getOperand(1));
346 // Otherwise, don't know what this is.
350 // Get the instruction before it if it's a terminator.
351 MachineInstr *SecondLastInst = I;
353 // If there are three terminators, we don't know what sort of block this is.
354 if (SecondLastInst && I != MBB.begin() &&
355 isUnpredicatedTerminator(--I))
358 // If the block ends with Alpha::BR and Alpha::COND_BRANCH_*, handle it.
359 if ((SecondLastInst->getOpcode() == Alpha::COND_BRANCH_I ||
360 SecondLastInst->getOpcode() == Alpha::COND_BRANCH_F) &&
361 LastInst->getOpcode() == Alpha::BR) {
362 TBB = SecondLastInst->getOperand(2).getMBB();
363 Cond.push_back(SecondLastInst->getOperand(0));
364 Cond.push_back(SecondLastInst->getOperand(1));
365 FBB = LastInst->getOperand(0).getMBB();
369 // If the block ends with two Alpha::BRs, handle it. The second one is not
370 // executed, so remove it.
371 if (SecondLastInst->getOpcode() == Alpha::BR &&
372 LastInst->getOpcode() == Alpha::BR) {
373 TBB = SecondLastInst->getOperand(0).getMBB();
375 I->eraseFromParent();
379 // Otherwise, can't handle this.
383 unsigned AlphaInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
384 MachineBasicBlock::iterator I = MBB.end();
385 if (I == MBB.begin()) return 0;
387 if (I->getOpcode() != Alpha::BR &&
388 I->getOpcode() != Alpha::COND_BRANCH_I &&
389 I->getOpcode() != Alpha::COND_BRANCH_F)
392 // Remove the branch.
393 I->eraseFromParent();
397 if (I == MBB.begin()) return 1;
399 if (I->getOpcode() != Alpha::COND_BRANCH_I &&
400 I->getOpcode() != Alpha::COND_BRANCH_F)
403 // Remove the branch.
404 I->eraseFromParent();
408 void AlphaInstrInfo::insertNoop(MachineBasicBlock &MBB,
409 MachineBasicBlock::iterator MI) const {
410 BuildMI(MBB, MI, get(Alpha::BISr), Alpha::R31).addReg(Alpha::R31)
414 bool AlphaInstrInfo::BlockHasNoFallThrough(const MachineBasicBlock &MBB) const {
415 if (MBB.empty()) return false;
417 switch (MBB.back().getOpcode()) {
418 case Alpha::RETDAG: // Return.
420 case Alpha::BR: // Uncond branch.
421 case Alpha::JMP: // Indirect branch.
423 default: return false;
426 bool AlphaInstrInfo::
427 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
428 assert(Cond.size() == 2 && "Invalid Alpha branch opcode!");
429 Cond[0].setImm(AlphaRevCondCode(Cond[0].getImm()));