1 //===- SystemZInstrInfo.cpp - SystemZ Instruction Information --------------===//
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 SystemZ implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
15 #include "SystemZInstrBuilder.h"
16 #include "SystemZInstrInfo.h"
17 #include "SystemZMachineFunctionInfo.h"
18 #include "SystemZTargetMachine.h"
19 #include "llvm/Function.h"
20 #include "llvm/CodeGen/MachineFrameInfo.h"
21 #include "llvm/CodeGen/MachineInstrBuilder.h"
22 #include "llvm/CodeGen/MachineRegisterInfo.h"
23 #include "llvm/CodeGen/PseudoSourceValue.h"
24 #include "llvm/Support/ErrorHandling.h"
26 #define GET_INSTRINFO_MC_DESC
27 #include "SystemZGenInstrInfo.inc"
31 SystemZInstrInfo::SystemZInstrInfo(SystemZTargetMachine &tm)
32 : TargetInstrInfoImpl(SystemZInsts, array_lengthof(SystemZInsts)),
33 RI(tm, *this), TM(tm) {
36 /// isGVStub - Return true if the GV requires an extra load to get the
38 static inline bool isGVStub(GlobalValue *GV, SystemZTargetMachine &TM) {
39 return TM.getSubtarget<SystemZSubtarget>().GVRequiresExtraLoad(GV, TM, false);
42 void SystemZInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
43 MachineBasicBlock::iterator MI,
44 unsigned SrcReg, bool isKill, int FrameIdx,
45 const TargetRegisterClass *RC,
46 const TargetRegisterInfo *TRI) const {
48 if (MI != MBB.end()) DL = MI->getDebugLoc();
51 if (RC == &SystemZ::GR32RegClass ||
52 RC == &SystemZ::ADDR32RegClass)
53 Opc = SystemZ::MOV32mr;
54 else if (RC == &SystemZ::GR64RegClass ||
55 RC == &SystemZ::ADDR64RegClass) {
56 Opc = SystemZ::MOV64mr;
57 } else if (RC == &SystemZ::FP32RegClass) {
58 Opc = SystemZ::FMOV32mr;
59 } else if (RC == &SystemZ::FP64RegClass) {
60 Opc = SystemZ::FMOV64mr;
61 } else if (RC == &SystemZ::GR64PRegClass) {
62 Opc = SystemZ::MOV64Pmr;
63 } else if (RC == &SystemZ::GR128RegClass) {
64 Opc = SystemZ::MOV128mr;
66 llvm_unreachable("Unsupported regclass to store");
68 addFrameReference(BuildMI(MBB, MI, DL, get(Opc)), FrameIdx)
69 .addReg(SrcReg, getKillRegState(isKill));
72 void SystemZInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
73 MachineBasicBlock::iterator MI,
74 unsigned DestReg, int FrameIdx,
75 const TargetRegisterClass *RC,
76 const TargetRegisterInfo *TRI) const{
78 if (MI != MBB.end()) DL = MI->getDebugLoc();
81 if (RC == &SystemZ::GR32RegClass ||
82 RC == &SystemZ::ADDR32RegClass)
83 Opc = SystemZ::MOV32rm;
84 else if (RC == &SystemZ::GR64RegClass ||
85 RC == &SystemZ::ADDR64RegClass) {
86 Opc = SystemZ::MOV64rm;
87 } else if (RC == &SystemZ::FP32RegClass) {
88 Opc = SystemZ::FMOV32rm;
89 } else if (RC == &SystemZ::FP64RegClass) {
90 Opc = SystemZ::FMOV64rm;
91 } else if (RC == &SystemZ::GR64PRegClass) {
92 Opc = SystemZ::MOV64Prm;
93 } else if (RC == &SystemZ::GR128RegClass) {
94 Opc = SystemZ::MOV128rm;
96 llvm_unreachable("Unsupported regclass to load");
98 addFrameReference(BuildMI(MBB, MI, DL, get(Opc), DestReg), FrameIdx);
101 void SystemZInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
102 MachineBasicBlock::iterator I, DebugLoc DL,
103 unsigned DestReg, unsigned SrcReg,
104 bool KillSrc) const {
106 if (SystemZ::GR64RegClass.contains(DestReg, SrcReg))
107 Opc = SystemZ::MOV64rr;
108 else if (SystemZ::GR32RegClass.contains(DestReg, SrcReg))
109 Opc = SystemZ::MOV32rr;
110 else if (SystemZ::GR64PRegClass.contains(DestReg, SrcReg))
111 Opc = SystemZ::MOV64rrP;
112 else if (SystemZ::GR128RegClass.contains(DestReg, SrcReg))
113 Opc = SystemZ::MOV128rr;
114 else if (SystemZ::FP32RegClass.contains(DestReg, SrcReg))
115 Opc = SystemZ::FMOV32rr;
116 else if (SystemZ::FP64RegClass.contains(DestReg, SrcReg))
117 Opc = SystemZ::FMOV64rr;
119 llvm_unreachable("Impossible reg-to-reg copy");
121 BuildMI(MBB, I, DL, get(Opc), DestReg)
122 .addReg(SrcReg, getKillRegState(KillSrc));
125 unsigned SystemZInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
126 int &FrameIndex) const {
127 switch (MI->getOpcode()) {
129 case SystemZ::MOV32rm:
130 case SystemZ::MOV32rmy:
131 case SystemZ::MOV64rm:
132 case SystemZ::MOVSX32rm8:
133 case SystemZ::MOVSX32rm16y:
134 case SystemZ::MOVSX64rm8:
135 case SystemZ::MOVSX64rm16:
136 case SystemZ::MOVSX64rm32:
137 case SystemZ::MOVZX32rm8:
138 case SystemZ::MOVZX32rm16:
139 case SystemZ::MOVZX64rm8:
140 case SystemZ::MOVZX64rm16:
141 case SystemZ::MOVZX64rm32:
142 case SystemZ::FMOV32rm:
143 case SystemZ::FMOV32rmy:
144 case SystemZ::FMOV64rm:
145 case SystemZ::FMOV64rmy:
146 case SystemZ::MOV64Prm:
147 case SystemZ::MOV64Prmy:
148 case SystemZ::MOV128rm:
149 if (MI->getOperand(1).isFI() &&
150 MI->getOperand(2).isImm() && MI->getOperand(3).isReg() &&
151 MI->getOperand(2).getImm() == 0 && MI->getOperand(3).getReg() == 0) {
152 FrameIndex = MI->getOperand(1).getIndex();
153 return MI->getOperand(0).getReg();
160 unsigned SystemZInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
161 int &FrameIndex) const {
162 switch (MI->getOpcode()) {
164 case SystemZ::MOV32mr:
165 case SystemZ::MOV32mry:
166 case SystemZ::MOV64mr:
167 case SystemZ::MOV32m8r:
168 case SystemZ::MOV32m8ry:
169 case SystemZ::MOV32m16r:
170 case SystemZ::MOV32m16ry:
171 case SystemZ::MOV64m8r:
172 case SystemZ::MOV64m8ry:
173 case SystemZ::MOV64m16r:
174 case SystemZ::MOV64m16ry:
175 case SystemZ::MOV64m32r:
176 case SystemZ::MOV64m32ry:
177 case SystemZ::FMOV32mr:
178 case SystemZ::FMOV32mry:
179 case SystemZ::FMOV64mr:
180 case SystemZ::FMOV64mry:
181 case SystemZ::MOV64Pmr:
182 case SystemZ::MOV64Pmry:
183 case SystemZ::MOV128mr:
184 if (MI->getOperand(0).isFI() &&
185 MI->getOperand(1).isImm() && MI->getOperand(2).isReg() &&
186 MI->getOperand(1).getImm() == 0 && MI->getOperand(2).getReg() == 0) {
187 FrameIndex = MI->getOperand(0).getIndex();
188 return MI->getOperand(3).getReg();
195 bool SystemZInstrInfo::
196 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
197 assert(Cond.size() == 1 && "Invalid Xbranch condition!");
199 SystemZCC::CondCodes CC = static_cast<SystemZCC::CondCodes>(Cond[0].getImm());
200 Cond[0].setImm(getOppositeCondition(CC));
204 bool SystemZInstrInfo::isUnpredicatedTerminator(const MachineInstr *MI) const {
205 const MCInstrDesc &MCID = MI->getDesc();
206 if (!MCID.isTerminator()) return false;
208 // Conditional branch is a special case.
209 if (MCID.isBranch() && !MCID.isBarrier())
211 if (!MCID.isPredicable())
213 return !isPredicated(MI);
216 bool SystemZInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
217 MachineBasicBlock *&TBB,
218 MachineBasicBlock *&FBB,
219 SmallVectorImpl<MachineOperand> &Cond,
220 bool AllowModify) const {
221 // Start from the bottom of the block and work up, examining the
222 // terminator instructions.
223 MachineBasicBlock::iterator I = MBB.end();
224 while (I != MBB.begin()) {
226 if (I->isDebugValue())
228 // Working from the bottom, when we see a non-terminator
229 // instruction, we're done.
230 if (!isUnpredicatedTerminator(I))
233 // A terminator that isn't a branch can't easily be handled
235 if (!I->getDesc().isBranch())
238 // Handle unconditional branches.
239 if (I->getOpcode() == SystemZ::JMP) {
241 TBB = I->getOperand(0).getMBB();
245 // If the block has any instructions after a JMP, delete them.
246 while (llvm::next(I) != MBB.end())
247 llvm::next(I)->eraseFromParent();
251 // Delete the JMP if it's equivalent to a fall-through.
252 if (MBB.isLayoutSuccessor(I->getOperand(0).getMBB())) {
254 I->eraseFromParent();
259 // TBB is used to indicate the unconditinal destination.
260 TBB = I->getOperand(0).getMBB();
264 // Handle conditional branches.
265 SystemZCC::CondCodes BranchCode = getCondFromBranchOpc(I->getOpcode());
266 if (BranchCode == SystemZCC::INVALID)
267 return true; // Can't handle indirect branch.
269 // Working from the bottom, handle the first conditional branch.
272 TBB = I->getOperand(0).getMBB();
273 Cond.push_back(MachineOperand::CreateImm(BranchCode));
277 // Handle subsequent conditional branches. Only handle the case where all
278 // conditional branches branch to the same destination.
279 assert(Cond.size() == 1);
282 // Only handle the case where all conditional branches branch to
283 // the same destination.
284 if (TBB != I->getOperand(0).getMBB())
287 SystemZCC::CondCodes OldBranchCode = (SystemZCC::CondCodes)Cond[0].getImm();
288 // If the conditions are the same, we can leave them alone.
289 if (OldBranchCode == BranchCode)
298 unsigned SystemZInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
299 MachineBasicBlock::iterator I = MBB.end();
302 while (I != MBB.begin()) {
304 if (I->isDebugValue())
306 if (I->getOpcode() != SystemZ::JMP &&
307 getCondFromBranchOpc(I->getOpcode()) == SystemZCC::INVALID)
309 // Remove the branch.
310 I->eraseFromParent();
319 SystemZInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
320 MachineBasicBlock *FBB,
321 const SmallVectorImpl<MachineOperand> &Cond,
323 // Shouldn't be a fall through.
324 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
325 assert((Cond.size() == 1 || Cond.size() == 0) &&
326 "SystemZ branch conditions have one component!");
329 // Unconditional branch?
330 assert(!FBB && "Unconditional branch with multiple successors!");
331 BuildMI(&MBB, DL, get(SystemZ::JMP)).addMBB(TBB);
335 // Conditional branch.
337 SystemZCC::CondCodes CC = (SystemZCC::CondCodes)Cond[0].getImm();
338 BuildMI(&MBB, DL, getBrCond(CC)).addMBB(TBB);
342 // Two-way Conditional branch. Insert the second branch.
343 BuildMI(&MBB, DL, get(SystemZ::JMP)).addMBB(FBB);
350 SystemZInstrInfo::getBrCond(SystemZCC::CondCodes CC) const {
353 llvm_unreachable("Unknown condition code!");
354 case SystemZCC::O: return get(SystemZ::JO);
355 case SystemZCC::H: return get(SystemZ::JH);
356 case SystemZCC::NLE: return get(SystemZ::JNLE);
357 case SystemZCC::L: return get(SystemZ::JL);
358 case SystemZCC::NHE: return get(SystemZ::JNHE);
359 case SystemZCC::LH: return get(SystemZ::JLH);
360 case SystemZCC::NE: return get(SystemZ::JNE);
361 case SystemZCC::E: return get(SystemZ::JE);
362 case SystemZCC::NLH: return get(SystemZ::JNLH);
363 case SystemZCC::HE: return get(SystemZ::JHE);
364 case SystemZCC::NL: return get(SystemZ::JNL);
365 case SystemZCC::LE: return get(SystemZ::JLE);
366 case SystemZCC::NH: return get(SystemZ::JNH);
367 case SystemZCC::NO: return get(SystemZ::JNO);
372 SystemZInstrInfo::getCondFromBranchOpc(unsigned Opc) const {
374 default: return SystemZCC::INVALID;
375 case SystemZ::JO: return SystemZCC::O;
376 case SystemZ::JH: return SystemZCC::H;
377 case SystemZ::JNLE: return SystemZCC::NLE;
378 case SystemZ::JL: return SystemZCC::L;
379 case SystemZ::JNHE: return SystemZCC::NHE;
380 case SystemZ::JLH: return SystemZCC::LH;
381 case SystemZ::JNE: return SystemZCC::NE;
382 case SystemZ::JE: return SystemZCC::E;
383 case SystemZ::JNLH: return SystemZCC::NLH;
384 case SystemZ::JHE: return SystemZCC::HE;
385 case SystemZ::JNL: return SystemZCC::NL;
386 case SystemZ::JLE: return SystemZCC::LE;
387 case SystemZ::JNH: return SystemZCC::NH;
388 case SystemZ::JNO: return SystemZCC::NO;
393 SystemZInstrInfo::getOppositeCondition(SystemZCC::CondCodes CC) const {
396 llvm_unreachable("Invalid condition!");
397 case SystemZCC::O: return SystemZCC::NO;
398 case SystemZCC::H: return SystemZCC::NH;
399 case SystemZCC::NLE: return SystemZCC::LE;
400 case SystemZCC::L: return SystemZCC::NL;
401 case SystemZCC::NHE: return SystemZCC::HE;
402 case SystemZCC::LH: return SystemZCC::NLH;
403 case SystemZCC::NE: return SystemZCC::E;
404 case SystemZCC::E: return SystemZCC::NE;
405 case SystemZCC::NLH: return SystemZCC::LH;
406 case SystemZCC::HE: return SystemZCC::NHE;
407 case SystemZCC::NL: return SystemZCC::L;
408 case SystemZCC::LE: return SystemZCC::NLE;
409 case SystemZCC::NH: return SystemZCC::H;
410 case SystemZCC::NO: return SystemZCC::O;
415 SystemZInstrInfo::getLongDispOpc(unsigned Opc) const {
418 llvm_unreachable("Don't have long disp version of this instruction");
419 case SystemZ::MOV32mr: return get(SystemZ::MOV32mry);
420 case SystemZ::MOV32rm: return get(SystemZ::MOV32rmy);
421 case SystemZ::MOVSX32rm16: return get(SystemZ::MOVSX32rm16y);
422 case SystemZ::MOV32m8r: return get(SystemZ::MOV32m8ry);
423 case SystemZ::MOV32m16r: return get(SystemZ::MOV32m16ry);
424 case SystemZ::MOV64m8r: return get(SystemZ::MOV64m8ry);
425 case SystemZ::MOV64m16r: return get(SystemZ::MOV64m16ry);
426 case SystemZ::MOV64m32r: return get(SystemZ::MOV64m32ry);
427 case SystemZ::MOV8mi: return get(SystemZ::MOV8miy);
428 case SystemZ::MUL32rm: return get(SystemZ::MUL32rmy);
429 case SystemZ::CMP32rm: return get(SystemZ::CMP32rmy);
430 case SystemZ::UCMP32rm: return get(SystemZ::UCMP32rmy);
431 case SystemZ::FMOV32mr: return get(SystemZ::FMOV32mry);
432 case SystemZ::FMOV64mr: return get(SystemZ::FMOV64mry);
433 case SystemZ::FMOV32rm: return get(SystemZ::FMOV32rmy);
434 case SystemZ::FMOV64rm: return get(SystemZ::FMOV64rmy);
435 case SystemZ::MOV64Pmr: return get(SystemZ::MOV64Pmry);
436 case SystemZ::MOV64Prm: return get(SystemZ::MOV64Prmy);