1 //===-- X86MCInstLower.cpp - Convert X86 MachineInstr to an MCInst --------===//
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 code to lower X86 MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
15 #include "X86AsmPrinter.h"
16 #include "InstPrinter/X86ATTInstPrinter.h"
17 #include "X86COFFMachineModuleInfo.h"
18 #include "llvm/ADT/SmallString.h"
19 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
20 #include "llvm/CodeGen/StackMaps.h"
21 #include "llvm/IR/Mangler.h"
22 #include "llvm/IR/Type.h"
23 #include "llvm/MC/MCAsmInfo.h"
24 #include "llvm/MC/MCContext.h"
25 #include "llvm/MC/MCExpr.h"
26 #include "llvm/MC/MCInst.h"
27 #include "llvm/MC/MCInstBuilder.h"
28 #include "llvm/MC/MCStreamer.h"
29 #include "llvm/MC/MCSymbol.h"
30 #include "llvm/Support/FormattedStream.h"
35 /// X86MCInstLower - This class is used to lower an MachineInstr into an MCInst.
36 class X86MCInstLower {
38 const MachineFunction &MF;
39 const TargetMachine &TM;
41 X86AsmPrinter &AsmPrinter;
43 X86MCInstLower(const MachineFunction &MF, X86AsmPrinter &asmprinter);
45 void Lower(const MachineInstr *MI, MCInst &OutMI) const;
47 MCSymbol *GetSymbolFromOperand(const MachineOperand &MO) const;
48 MCOperand LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const;
51 MachineModuleInfoMachO &getMachOMMI() const;
52 Mangler *getMang() const {
53 return AsmPrinter.Mang;
57 } // end anonymous namespace
59 X86MCInstLower::X86MCInstLower(const MachineFunction &mf,
60 X86AsmPrinter &asmprinter)
61 : Ctx(mf.getContext()), MF(mf), TM(mf.getTarget()),
62 MAI(*TM.getMCAsmInfo()), AsmPrinter(asmprinter) {}
64 MachineModuleInfoMachO &X86MCInstLower::getMachOMMI() const {
65 return MF.getMMI().getObjFileInfo<MachineModuleInfoMachO>();
69 /// GetSymbolFromOperand - Lower an MO_GlobalAddress or MO_ExternalSymbol
70 /// operand to an MCSymbol.
71 MCSymbol *X86MCInstLower::
72 GetSymbolFromOperand(const MachineOperand &MO) const {
73 const DataLayout *DL = TM.getDataLayout();
74 assert((MO.isGlobal() || MO.isSymbol() || MO.isMBB()) && "Isn't a symbol reference");
76 SmallString<128> Name;
79 switch (MO.getTargetFlags()) {
80 case X86II::MO_DLLIMPORT:
81 // Handle dllimport linkage.
84 case X86II::MO_DARWIN_STUB:
87 case X86II::MO_DARWIN_NONLAZY:
88 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
89 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
90 Suffix = "$non_lazy_ptr";
95 Name += DL->getPrivateGlobalPrefix();
97 unsigned PrefixLen = Name.size();
100 const GlobalValue *GV = MO.getGlobal();
101 getMang()->getNameWithPrefix(Name, GV);
102 } else if (MO.isSymbol()) {
103 getMang()->getNameWithPrefix(Name, MO.getSymbolName());
104 } else if (MO.isMBB()) {
105 Name += MO.getMBB()->getSymbol()->getName();
107 unsigned OrigLen = Name.size() - PrefixLen;
110 MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name);
112 StringRef OrigName = StringRef(Name).substr(PrefixLen, OrigLen);
114 // If the target flags on the operand changes the name of the symbol, do that
115 // before we return the symbol.
116 switch (MO.getTargetFlags()) {
118 case X86II::MO_DARWIN_NONLAZY:
119 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
120 MachineModuleInfoImpl::StubValueTy &StubSym =
121 getMachOMMI().getGVStubEntry(Sym);
122 if (StubSym.getPointer() == 0) {
123 assert(MO.isGlobal() && "Extern symbol not handled yet");
125 MachineModuleInfoImpl::
126 StubValueTy(AsmPrinter.getSymbol(MO.getGlobal()),
127 !MO.getGlobal()->hasInternalLinkage());
131 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
132 MachineModuleInfoImpl::StubValueTy &StubSym =
133 getMachOMMI().getHiddenGVStubEntry(Sym);
134 if (StubSym.getPointer() == 0) {
135 assert(MO.isGlobal() && "Extern symbol not handled yet");
137 MachineModuleInfoImpl::
138 StubValueTy(AsmPrinter.getSymbol(MO.getGlobal()),
139 !MO.getGlobal()->hasInternalLinkage());
143 case X86II::MO_DARWIN_STUB: {
144 MachineModuleInfoImpl::StubValueTy &StubSym =
145 getMachOMMI().getFnStubEntry(Sym);
146 if (StubSym.getPointer())
151 MachineModuleInfoImpl::
152 StubValueTy(AsmPrinter.getSymbol(MO.getGlobal()),
153 !MO.getGlobal()->hasInternalLinkage());
156 MachineModuleInfoImpl::
157 StubValueTy(Ctx.GetOrCreateSymbol(OrigName), false);
166 MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
167 MCSymbol *Sym) const {
168 // FIXME: We would like an efficient form for this, so we don't have to do a
169 // lot of extra uniquing.
170 const MCExpr *Expr = 0;
171 MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
173 switch (MO.getTargetFlags()) {
174 default: llvm_unreachable("Unknown target flag on GV operand");
175 case X86II::MO_NO_FLAG: // No flag.
176 // These affect the name of the symbol, not any suffix.
177 case X86II::MO_DARWIN_NONLAZY:
178 case X86II::MO_DLLIMPORT:
179 case X86II::MO_DARWIN_STUB:
182 case X86II::MO_TLVP: RefKind = MCSymbolRefExpr::VK_TLVP; break;
183 case X86II::MO_TLVP_PIC_BASE:
184 Expr = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_TLVP, Ctx);
185 // Subtract the pic base.
186 Expr = MCBinaryExpr::CreateSub(Expr,
187 MCSymbolRefExpr::Create(MF.getPICBaseSymbol(),
191 case X86II::MO_SECREL: RefKind = MCSymbolRefExpr::VK_SECREL; break;
192 case X86II::MO_TLSGD: RefKind = MCSymbolRefExpr::VK_TLSGD; break;
193 case X86II::MO_TLSLD: RefKind = MCSymbolRefExpr::VK_TLSLD; break;
194 case X86II::MO_TLSLDM: RefKind = MCSymbolRefExpr::VK_TLSLDM; break;
195 case X86II::MO_GOTTPOFF: RefKind = MCSymbolRefExpr::VK_GOTTPOFF; break;
196 case X86II::MO_INDNTPOFF: RefKind = MCSymbolRefExpr::VK_INDNTPOFF; break;
197 case X86II::MO_TPOFF: RefKind = MCSymbolRefExpr::VK_TPOFF; break;
198 case X86II::MO_DTPOFF: RefKind = MCSymbolRefExpr::VK_DTPOFF; break;
199 case X86II::MO_NTPOFF: RefKind = MCSymbolRefExpr::VK_NTPOFF; break;
200 case X86II::MO_GOTNTPOFF: RefKind = MCSymbolRefExpr::VK_GOTNTPOFF; break;
201 case X86II::MO_GOTPCREL: RefKind = MCSymbolRefExpr::VK_GOTPCREL; break;
202 case X86II::MO_GOT: RefKind = MCSymbolRefExpr::VK_GOT; break;
203 case X86II::MO_GOTOFF: RefKind = MCSymbolRefExpr::VK_GOTOFF; break;
204 case X86II::MO_PLT: RefKind = MCSymbolRefExpr::VK_PLT; break;
205 case X86II::MO_PIC_BASE_OFFSET:
206 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
207 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
208 Expr = MCSymbolRefExpr::Create(Sym, Ctx);
209 // Subtract the pic base.
210 Expr = MCBinaryExpr::CreateSub(Expr,
211 MCSymbolRefExpr::Create(MF.getPICBaseSymbol(), Ctx),
213 if (MO.isJTI() && MAI.hasSetDirective()) {
214 // If .set directive is supported, use it to reduce the number of
215 // relocations the assembler will generate for differences between
216 // local labels. This is only safe when the symbols are in the same
217 // section so we are restricting it to jumptable references.
218 MCSymbol *Label = Ctx.CreateTempSymbol();
219 AsmPrinter.OutStreamer.EmitAssignment(Label, Expr);
220 Expr = MCSymbolRefExpr::Create(Label, Ctx);
226 Expr = MCSymbolRefExpr::Create(Sym, RefKind, Ctx);
228 if (!MO.isJTI() && !MO.isMBB() && MO.getOffset())
229 Expr = MCBinaryExpr::CreateAdd(Expr,
230 MCConstantExpr::Create(MO.getOffset(), Ctx),
232 return MCOperand::CreateExpr(Expr);
236 /// \brief Simplify FOO $imm, %{al,ax,eax,rax} to FOO $imm, for instruction with
237 /// a short fixed-register form.
238 static void SimplifyShortImmForm(MCInst &Inst, unsigned Opcode) {
239 unsigned ImmOp = Inst.getNumOperands() - 1;
240 assert(Inst.getOperand(0).isReg() &&
241 (Inst.getOperand(ImmOp).isImm() || Inst.getOperand(ImmOp).isExpr()) &&
242 ((Inst.getNumOperands() == 3 && Inst.getOperand(1).isReg() &&
243 Inst.getOperand(0).getReg() == Inst.getOperand(1).getReg()) ||
244 Inst.getNumOperands() == 2) && "Unexpected instruction!");
246 // Check whether the destination register can be fixed.
247 unsigned Reg = Inst.getOperand(0).getReg();
248 if (Reg != X86::AL && Reg != X86::AX && Reg != X86::EAX && Reg != X86::RAX)
251 // If so, rewrite the instruction.
252 MCOperand Saved = Inst.getOperand(ImmOp);
254 Inst.setOpcode(Opcode);
255 Inst.addOperand(Saved);
258 /// \brief If a movsx instruction has a shorter encoding for the used register
259 /// simplify the instruction to use it instead.
260 static void SimplifyMOVSX(MCInst &Inst) {
261 unsigned NewOpcode = 0;
262 unsigned Op0 = Inst.getOperand(0).getReg(), Op1 = Inst.getOperand(1).getReg();
263 switch (Inst.getOpcode()) {
265 llvm_unreachable("Unexpected instruction!");
266 case X86::MOVSX16rr8: // movsbw %al, %ax --> cbtw
267 if (Op0 == X86::AX && Op1 == X86::AL)
268 NewOpcode = X86::CBW;
270 case X86::MOVSX32rr16: // movswl %ax, %eax --> cwtl
271 if (Op0 == X86::EAX && Op1 == X86::AX)
272 NewOpcode = X86::CWDE;
274 case X86::MOVSX64rr32: // movslq %eax, %rax --> cltq
275 if (Op0 == X86::RAX && Op1 == X86::EAX)
276 NewOpcode = X86::CDQE;
280 if (NewOpcode != 0) {
282 Inst.setOpcode(NewOpcode);
286 /// \brief Simplify things like MOV32rm to MOV32o32a.
287 static void SimplifyShortMoveForm(X86AsmPrinter &Printer, MCInst &Inst,
289 // Don't make these simplifications in 64-bit mode; other assemblers don't
290 // perform them because they make the code larger.
291 if (Printer.getSubtarget().is64Bit())
294 bool IsStore = Inst.getOperand(0).isReg() && Inst.getOperand(1).isReg();
295 unsigned AddrBase = IsStore;
296 unsigned RegOp = IsStore ? 0 : 5;
297 unsigned AddrOp = AddrBase + 3;
298 assert(Inst.getNumOperands() == 6 && Inst.getOperand(RegOp).isReg() &&
299 Inst.getOperand(AddrBase + 0).isReg() && // base
300 Inst.getOperand(AddrBase + 1).isImm() && // scale
301 Inst.getOperand(AddrBase + 2).isReg() && // index register
302 (Inst.getOperand(AddrOp).isExpr() || // address
303 Inst.getOperand(AddrOp).isImm())&&
304 Inst.getOperand(AddrBase + 4).isReg() && // segment
305 "Unexpected instruction!");
307 // Check whether the destination register can be fixed.
308 unsigned Reg = Inst.getOperand(RegOp).getReg();
309 if (Reg != X86::AL && Reg != X86::AX && Reg != X86::EAX && Reg != X86::RAX)
312 // Check whether this is an absolute address.
313 // FIXME: We know TLVP symbol refs aren't, but there should be a better way
315 bool Absolute = true;
316 if (Inst.getOperand(AddrOp).isExpr()) {
317 const MCExpr *MCE = Inst.getOperand(AddrOp).getExpr();
318 if (const MCSymbolRefExpr *SRE = dyn_cast<MCSymbolRefExpr>(MCE))
319 if (SRE->getKind() == MCSymbolRefExpr::VK_TLVP)
324 (Inst.getOperand(AddrBase + 0).getReg() != 0 ||
325 Inst.getOperand(AddrBase + 2).getReg() != 0 ||
326 Inst.getOperand(AddrBase + 4).getReg() != 0 ||
327 Inst.getOperand(AddrBase + 1).getImm() != 1))
330 // If so, rewrite the instruction.
331 MCOperand Saved = Inst.getOperand(AddrOp);
333 Inst.setOpcode(Opcode);
334 Inst.addOperand(Saved);
337 static unsigned getRetOpcode(const X86Subtarget &Subtarget)
339 return Subtarget.is64Bit() ? X86::RETQ : X86::RETL;
342 void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
343 OutMI.setOpcode(MI->getOpcode());
345 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
346 const MachineOperand &MO = MI->getOperand(i);
349 switch (MO.getType()) {
352 llvm_unreachable("unknown operand type");
353 case MachineOperand::MO_Register:
354 // Ignore all implicit register operands.
355 if (MO.isImplicit()) continue;
356 MCOp = MCOperand::CreateReg(MO.getReg());
358 case MachineOperand::MO_Immediate:
359 MCOp = MCOperand::CreateImm(MO.getImm());
361 case MachineOperand::MO_MachineBasicBlock:
362 case MachineOperand::MO_GlobalAddress:
363 case MachineOperand::MO_ExternalSymbol:
364 MCOp = LowerSymbolOperand(MO, GetSymbolFromOperand(MO));
366 case MachineOperand::MO_JumpTableIndex:
367 MCOp = LowerSymbolOperand(MO, AsmPrinter.GetJTISymbol(MO.getIndex()));
369 case MachineOperand::MO_ConstantPoolIndex:
370 MCOp = LowerSymbolOperand(MO, AsmPrinter.GetCPISymbol(MO.getIndex()));
372 case MachineOperand::MO_BlockAddress:
373 MCOp = LowerSymbolOperand(MO,
374 AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress()));
376 case MachineOperand::MO_RegisterMask:
377 // Ignore call clobbers.
381 OutMI.addOperand(MCOp);
384 // Handle a few special cases to eliminate operand modifiers.
386 switch (OutMI.getOpcode()) {
391 // LEA should have a segment register, but it must be empty.
392 assert(OutMI.getNumOperands() == 1+X86::AddrNumOperands &&
393 "Unexpected # of LEA operands");
394 assert(OutMI.getOperand(1+X86::AddrSegmentReg).getReg() == 0 &&
395 "LEA has segment specified!");
399 OutMI.setOpcode(X86::MOV32ri);
402 // Commute operands to get a smaller encoding by using VEX.R instead of VEX.B
403 // if one of the registers is extended, but other isn't.
405 case X86::VMOVAPDYrr:
407 case X86::VMOVAPSYrr:
409 case X86::VMOVDQAYrr:
411 case X86::VMOVDQUYrr:
413 case X86::VMOVUPDYrr:
415 case X86::VMOVUPSYrr: {
416 if (!X86II::isX86_64ExtendedReg(OutMI.getOperand(0).getReg()) &&
417 X86II::isX86_64ExtendedReg(OutMI.getOperand(1).getReg())) {
419 switch (OutMI.getOpcode()) {
420 default: llvm_unreachable("Invalid opcode");
421 case X86::VMOVAPDrr: NewOpc = X86::VMOVAPDrr_REV; break;
422 case X86::VMOVAPDYrr: NewOpc = X86::VMOVAPDYrr_REV; break;
423 case X86::VMOVAPSrr: NewOpc = X86::VMOVAPSrr_REV; break;
424 case X86::VMOVAPSYrr: NewOpc = X86::VMOVAPSYrr_REV; break;
425 case X86::VMOVDQArr: NewOpc = X86::VMOVDQArr_REV; break;
426 case X86::VMOVDQAYrr: NewOpc = X86::VMOVDQAYrr_REV; break;
427 case X86::VMOVDQUrr: NewOpc = X86::VMOVDQUrr_REV; break;
428 case X86::VMOVDQUYrr: NewOpc = X86::VMOVDQUYrr_REV; break;
429 case X86::VMOVUPDrr: NewOpc = X86::VMOVUPDrr_REV; break;
430 case X86::VMOVUPDYrr: NewOpc = X86::VMOVUPDYrr_REV; break;
431 case X86::VMOVUPSrr: NewOpc = X86::VMOVUPSrr_REV; break;
432 case X86::VMOVUPSYrr: NewOpc = X86::VMOVUPSYrr_REV; break;
434 OutMI.setOpcode(NewOpc);
439 case X86::VMOVSSrr: {
440 if (!X86II::isX86_64ExtendedReg(OutMI.getOperand(0).getReg()) &&
441 X86II::isX86_64ExtendedReg(OutMI.getOperand(2).getReg())) {
443 switch (OutMI.getOpcode()) {
444 default: llvm_unreachable("Invalid opcode");
445 case X86::VMOVSDrr: NewOpc = X86::VMOVSDrr_REV; break;
446 case X86::VMOVSSrr: NewOpc = X86::VMOVSSrr_REV; break;
448 OutMI.setOpcode(NewOpc);
453 // TAILJMPr64, CALL64r, CALL64pcrel32 - These instructions have register
454 // inputs modeled as normal uses instead of implicit uses. As such, truncate
455 // off all but the first operand (the callee). FIXME: Change isel.
456 case X86::TAILJMPr64:
458 case X86::CALL64pcrel32: {
459 unsigned Opcode = OutMI.getOpcode();
460 MCOperand Saved = OutMI.getOperand(0);
462 OutMI.setOpcode(Opcode);
463 OutMI.addOperand(Saved);
468 case X86::EH_RETURN64: {
470 OutMI.setOpcode(getRetOpcode(AsmPrinter.getSubtarget()));
474 // TAILJMPd, TAILJMPd64 - Lower to the correct jump instructions.
477 case X86::TAILJMPd64: {
479 switch (OutMI.getOpcode()) {
480 default: llvm_unreachable("Invalid opcode");
481 case X86::TAILJMPr: Opcode = X86::JMP32r; break;
483 case X86::TAILJMPd64: Opcode = X86::JMP_1; break;
486 MCOperand Saved = OutMI.getOperand(0);
488 OutMI.setOpcode(Opcode);
489 OutMI.addOperand(Saved);
493 // These are pseudo-ops for OR to help with the OR->ADD transformation. We do
494 // this with an ugly goto in case the resultant OR uses EAX and needs the
496 case X86::ADD16rr_DB: OutMI.setOpcode(X86::OR16rr); goto ReSimplify;
497 case X86::ADD32rr_DB: OutMI.setOpcode(X86::OR32rr); goto ReSimplify;
498 case X86::ADD64rr_DB: OutMI.setOpcode(X86::OR64rr); goto ReSimplify;
499 case X86::ADD16ri_DB: OutMI.setOpcode(X86::OR16ri); goto ReSimplify;
500 case X86::ADD32ri_DB: OutMI.setOpcode(X86::OR32ri); goto ReSimplify;
501 case X86::ADD64ri32_DB: OutMI.setOpcode(X86::OR64ri32); goto ReSimplify;
502 case X86::ADD16ri8_DB: OutMI.setOpcode(X86::OR16ri8); goto ReSimplify;
503 case X86::ADD32ri8_DB: OutMI.setOpcode(X86::OR32ri8); goto ReSimplify;
504 case X86::ADD64ri8_DB: OutMI.setOpcode(X86::OR64ri8); goto ReSimplify;
506 // The assembler backend wants to see branches in their small form and relax
507 // them to their large form. The JIT can only handle the large form because
508 // it does not do relaxation. For now, translate the large form to the
510 case X86::JMP_4: OutMI.setOpcode(X86::JMP_1); break;
511 case X86::JO_4: OutMI.setOpcode(X86::JO_1); break;
512 case X86::JNO_4: OutMI.setOpcode(X86::JNO_1); break;
513 case X86::JB_4: OutMI.setOpcode(X86::JB_1); break;
514 case X86::JAE_4: OutMI.setOpcode(X86::JAE_1); break;
515 case X86::JE_4: OutMI.setOpcode(X86::JE_1); break;
516 case X86::JNE_4: OutMI.setOpcode(X86::JNE_1); break;
517 case X86::JBE_4: OutMI.setOpcode(X86::JBE_1); break;
518 case X86::JA_4: OutMI.setOpcode(X86::JA_1); break;
519 case X86::JS_4: OutMI.setOpcode(X86::JS_1); break;
520 case X86::JNS_4: OutMI.setOpcode(X86::JNS_1); break;
521 case X86::JP_4: OutMI.setOpcode(X86::JP_1); break;
522 case X86::JNP_4: OutMI.setOpcode(X86::JNP_1); break;
523 case X86::JL_4: OutMI.setOpcode(X86::JL_1); break;
524 case X86::JGE_4: OutMI.setOpcode(X86::JGE_1); break;
525 case X86::JLE_4: OutMI.setOpcode(X86::JLE_1); break;
526 case X86::JG_4: OutMI.setOpcode(X86::JG_1); break;
528 // Atomic load and store require a separate pseudo-inst because Acquire
529 // implies mayStore and Release implies mayLoad; fix these to regular MOV
531 case X86::ACQUIRE_MOV8rm: OutMI.setOpcode(X86::MOV8rm); goto ReSimplify;
532 case X86::ACQUIRE_MOV16rm: OutMI.setOpcode(X86::MOV16rm); goto ReSimplify;
533 case X86::ACQUIRE_MOV32rm: OutMI.setOpcode(X86::MOV32rm); goto ReSimplify;
534 case X86::ACQUIRE_MOV64rm: OutMI.setOpcode(X86::MOV64rm); goto ReSimplify;
535 case X86::RELEASE_MOV8mr: OutMI.setOpcode(X86::MOV8mr); goto ReSimplify;
536 case X86::RELEASE_MOV16mr: OutMI.setOpcode(X86::MOV16mr); goto ReSimplify;
537 case X86::RELEASE_MOV32mr: OutMI.setOpcode(X86::MOV32mr); goto ReSimplify;
538 case X86::RELEASE_MOV64mr: OutMI.setOpcode(X86::MOV64mr); goto ReSimplify;
540 // We don't currently select the correct instruction form for instructions
541 // which have a short %eax, etc. form. Handle this by custom lowering, for
544 // Note, we are currently not handling the following instructions:
545 // MOV64ao8, MOV64o8a
546 // XCHG16ar, XCHG32ar, XCHG64ar
547 case X86::MOV8mr_NOREX:
548 case X86::MOV8mr: SimplifyShortMoveForm(AsmPrinter, OutMI, X86::MOV8ao8); break;
549 case X86::MOV8rm_NOREX:
550 case X86::MOV8rm: SimplifyShortMoveForm(AsmPrinter, OutMI, X86::MOV8o8a); break;
551 case X86::MOV16mr: SimplifyShortMoveForm(AsmPrinter, OutMI, X86::MOV16ao16); break;
552 case X86::MOV16rm: SimplifyShortMoveForm(AsmPrinter, OutMI, X86::MOV16o16a); break;
553 case X86::MOV32mr: SimplifyShortMoveForm(AsmPrinter, OutMI, X86::MOV32ao32); break;
554 case X86::MOV32rm: SimplifyShortMoveForm(AsmPrinter, OutMI, X86::MOV32o32a); break;
556 case X86::ADC8ri: SimplifyShortImmForm(OutMI, X86::ADC8i8); break;
557 case X86::ADC16ri: SimplifyShortImmForm(OutMI, X86::ADC16i16); break;
558 case X86::ADC32ri: SimplifyShortImmForm(OutMI, X86::ADC32i32); break;
559 case X86::ADC64ri32: SimplifyShortImmForm(OutMI, X86::ADC64i32); break;
560 case X86::ADD8ri: SimplifyShortImmForm(OutMI, X86::ADD8i8); break;
561 case X86::ADD16ri: SimplifyShortImmForm(OutMI, X86::ADD16i16); break;
562 case X86::ADD32ri: SimplifyShortImmForm(OutMI, X86::ADD32i32); break;
563 case X86::ADD64ri32: SimplifyShortImmForm(OutMI, X86::ADD64i32); break;
564 case X86::AND8ri: SimplifyShortImmForm(OutMI, X86::AND8i8); break;
565 case X86::AND16ri: SimplifyShortImmForm(OutMI, X86::AND16i16); break;
566 case X86::AND32ri: SimplifyShortImmForm(OutMI, X86::AND32i32); break;
567 case X86::AND64ri32: SimplifyShortImmForm(OutMI, X86::AND64i32); break;
568 case X86::CMP8ri: SimplifyShortImmForm(OutMI, X86::CMP8i8); break;
569 case X86::CMP16ri: SimplifyShortImmForm(OutMI, X86::CMP16i16); break;
570 case X86::CMP32ri: SimplifyShortImmForm(OutMI, X86::CMP32i32); break;
571 case X86::CMP64ri32: SimplifyShortImmForm(OutMI, X86::CMP64i32); break;
572 case X86::OR8ri: SimplifyShortImmForm(OutMI, X86::OR8i8); break;
573 case X86::OR16ri: SimplifyShortImmForm(OutMI, X86::OR16i16); break;
574 case X86::OR32ri: SimplifyShortImmForm(OutMI, X86::OR32i32); break;
575 case X86::OR64ri32: SimplifyShortImmForm(OutMI, X86::OR64i32); break;
576 case X86::SBB8ri: SimplifyShortImmForm(OutMI, X86::SBB8i8); break;
577 case X86::SBB16ri: SimplifyShortImmForm(OutMI, X86::SBB16i16); break;
578 case X86::SBB32ri: SimplifyShortImmForm(OutMI, X86::SBB32i32); break;
579 case X86::SBB64ri32: SimplifyShortImmForm(OutMI, X86::SBB64i32); break;
580 case X86::SUB8ri: SimplifyShortImmForm(OutMI, X86::SUB8i8); break;
581 case X86::SUB16ri: SimplifyShortImmForm(OutMI, X86::SUB16i16); break;
582 case X86::SUB32ri: SimplifyShortImmForm(OutMI, X86::SUB32i32); break;
583 case X86::SUB64ri32: SimplifyShortImmForm(OutMI, X86::SUB64i32); break;
584 case X86::TEST8ri: SimplifyShortImmForm(OutMI, X86::TEST8i8); break;
585 case X86::TEST16ri: SimplifyShortImmForm(OutMI, X86::TEST16i16); break;
586 case X86::TEST32ri: SimplifyShortImmForm(OutMI, X86::TEST32i32); break;
587 case X86::TEST64ri32: SimplifyShortImmForm(OutMI, X86::TEST64i32); break;
588 case X86::XOR8ri: SimplifyShortImmForm(OutMI, X86::XOR8i8); break;
589 case X86::XOR16ri: SimplifyShortImmForm(OutMI, X86::XOR16i16); break;
590 case X86::XOR32ri: SimplifyShortImmForm(OutMI, X86::XOR32i32); break;
591 case X86::XOR64ri32: SimplifyShortImmForm(OutMI, X86::XOR64i32); break;
593 // Try to shrink some forms of movsx.
594 case X86::MOVSX16rr8:
595 case X86::MOVSX32rr16:
596 case X86::MOVSX64rr32:
597 SimplifyMOVSX(OutMI);
602 static void LowerTlsAddr(MCStreamer &OutStreamer,
603 X86MCInstLower &MCInstLowering,
604 const MachineInstr &MI) {
606 bool is64Bits = MI.getOpcode() == X86::TLS_addr64 ||
607 MI.getOpcode() == X86::TLS_base_addr64;
609 bool needsPadding = MI.getOpcode() == X86::TLS_addr64;
611 MCContext &context = OutStreamer.getContext();
614 OutStreamer.EmitInstruction(MCInstBuilder(X86::DATA16_PREFIX));
616 MCSymbolRefExpr::VariantKind SRVK;
617 switch (MI.getOpcode()) {
618 case X86::TLS_addr32:
619 case X86::TLS_addr64:
620 SRVK = MCSymbolRefExpr::VK_TLSGD;
622 case X86::TLS_base_addr32:
623 SRVK = MCSymbolRefExpr::VK_TLSLDM;
625 case X86::TLS_base_addr64:
626 SRVK = MCSymbolRefExpr::VK_TLSLD;
629 llvm_unreachable("unexpected opcode");
632 MCSymbol *sym = MCInstLowering.GetSymbolFromOperand(MI.getOperand(3));
633 const MCSymbolRefExpr *symRef = MCSymbolRefExpr::Create(sym, SRVK, context);
637 LEA.setOpcode(X86::LEA64r);
638 LEA.addOperand(MCOperand::CreateReg(X86::RDI)); // dest
639 LEA.addOperand(MCOperand::CreateReg(X86::RIP)); // base
640 LEA.addOperand(MCOperand::CreateImm(1)); // scale
641 LEA.addOperand(MCOperand::CreateReg(0)); // index
642 LEA.addOperand(MCOperand::CreateExpr(symRef)); // disp
643 LEA.addOperand(MCOperand::CreateReg(0)); // seg
644 } else if (SRVK == MCSymbolRefExpr::VK_TLSLDM) {
645 LEA.setOpcode(X86::LEA32r);
646 LEA.addOperand(MCOperand::CreateReg(X86::EAX)); // dest
647 LEA.addOperand(MCOperand::CreateReg(X86::EBX)); // base
648 LEA.addOperand(MCOperand::CreateImm(1)); // scale
649 LEA.addOperand(MCOperand::CreateReg(0)); // index
650 LEA.addOperand(MCOperand::CreateExpr(symRef)); // disp
651 LEA.addOperand(MCOperand::CreateReg(0)); // seg
653 LEA.setOpcode(X86::LEA32r);
654 LEA.addOperand(MCOperand::CreateReg(X86::EAX)); // dest
655 LEA.addOperand(MCOperand::CreateReg(0)); // base
656 LEA.addOperand(MCOperand::CreateImm(1)); // scale
657 LEA.addOperand(MCOperand::CreateReg(X86::EBX)); // index
658 LEA.addOperand(MCOperand::CreateExpr(symRef)); // disp
659 LEA.addOperand(MCOperand::CreateReg(0)); // seg
661 OutStreamer.EmitInstruction(LEA);
664 OutStreamer.EmitInstruction(MCInstBuilder(X86::DATA16_PREFIX));
665 OutStreamer.EmitInstruction(MCInstBuilder(X86::DATA16_PREFIX));
666 OutStreamer.EmitInstruction(MCInstBuilder(X86::REX64_PREFIX));
669 StringRef name = is64Bits ? "__tls_get_addr" : "___tls_get_addr";
670 MCSymbol *tlsGetAddr = context.GetOrCreateSymbol(name);
671 const MCSymbolRefExpr *tlsRef =
672 MCSymbolRefExpr::Create(tlsGetAddr,
673 MCSymbolRefExpr::VK_PLT,
676 OutStreamer.EmitInstruction(MCInstBuilder(is64Bits ? X86::CALL64pcrel32
681 /// \brief Emit the optimal amount of multi-byte nops on X86.
682 static void EmitNops(MCStreamer &OS, unsigned NumBytes, bool Is64Bit) {
683 // This works only for 64bit. For 32bit we have to do additional checking if
684 // the CPU supports multi-byte nops.
685 assert(Is64Bit && "EmitNops only supports X86-64");
687 unsigned Opc, BaseReg, ScaleVal, IndexReg, Displacement, SegmentReg;
688 Opc = IndexReg = Displacement = SegmentReg = 0;
689 BaseReg = X86::RAX; ScaleVal = 1;
691 case 0: llvm_unreachable("Zero nops?"); break;
692 case 1: NumBytes -= 1; Opc = X86::NOOP; break;
693 case 2: NumBytes -= 2; Opc = X86::XCHG16ar; break;
694 case 3: NumBytes -= 3; Opc = X86::NOOPL; break;
695 case 4: NumBytes -= 4; Opc = X86::NOOPL; Displacement = 8; break;
696 case 5: NumBytes -= 5; Opc = X86::NOOPL; Displacement = 8;
697 IndexReg = X86::RAX; break;
698 case 6: NumBytes -= 6; Opc = X86::NOOPW; Displacement = 8;
699 IndexReg = X86::RAX; break;
700 case 7: NumBytes -= 7; Opc = X86::NOOPL; Displacement = 512; break;
701 case 8: NumBytes -= 8; Opc = X86::NOOPL; Displacement = 512;
702 IndexReg = X86::RAX; break;
703 case 9: NumBytes -= 9; Opc = X86::NOOPW; Displacement = 512;
704 IndexReg = X86::RAX; break;
705 default: NumBytes -= 10; Opc = X86::NOOPW; Displacement = 512;
706 IndexReg = X86::RAX; SegmentReg = X86::CS; break;
709 unsigned NumPrefixes = std::min(NumBytes, 5U);
710 NumBytes -= NumPrefixes;
711 for (unsigned i = 0; i != NumPrefixes; ++i)
712 OS.EmitBytes("\x66");
715 default: llvm_unreachable("Unexpected opcode"); break;
717 OS.EmitInstruction(MCInstBuilder(Opc));
720 OS.EmitInstruction(MCInstBuilder(Opc).addReg(X86::AX));
724 OS.EmitInstruction(MCInstBuilder(Opc).addReg(BaseReg).addImm(ScaleVal)
726 .addImm(Displacement)
727 .addReg(SegmentReg));
730 } // while (NumBytes)
733 // Lower a stackmap of the form:
734 // <id>, <shadowBytes>, ...
735 static void LowerSTACKMAP(MCStreamer &OS, StackMaps &SM,
736 const MachineInstr &MI, bool Is64Bit) {
737 unsigned NumBytes = MI.getOperand(1).getImm();
738 SM.recordStackMap(MI);
740 // FIXME: These nops ensure that the stackmap's shadow is covered by
741 // instructions from the same basic block, but the nops should not be
742 // necessary if instructions from the same block follow the stackmap.
743 EmitNops(OS, NumBytes, Is64Bit);
746 // Lower a patchpoint of the form:
747 // [<def>], <id>, <numBytes>, <target>, <numArgs>, <cc>, ...
748 static void LowerPATCHPOINT(MCStreamer &OS, StackMaps &SM,
749 const MachineInstr &MI, bool Is64Bit) {
750 assert(Is64Bit && "Patchpoint currently only supports X86-64");
751 SM.recordPatchPoint(MI);
753 PatchPointOpers opers(&MI);
754 unsigned ScratchIdx = opers.getNextScratchIdx();
755 unsigned EncodedBytes = 0;
756 int64_t CallTarget = opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
758 // Emit MOV to materialize the target address and the CALL to target.
759 // This is encoded with 12-13 bytes, depending on which register is used.
760 unsigned ScratchReg = MI.getOperand(ScratchIdx).getReg();
761 if (X86II::isX86_64ExtendedReg(ScratchReg))
765 OS.EmitInstruction(MCInstBuilder(X86::MOV64ri).addReg(ScratchReg)
766 .addImm(CallTarget));
767 OS.EmitInstruction(MCInstBuilder(X86::CALL64r).addReg(ScratchReg));
770 unsigned NumBytes = opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
771 assert(NumBytes >= EncodedBytes &&
772 "Patchpoint can't request size less than the length of a call.");
774 EmitNops(OS, NumBytes - EncodedBytes, Is64Bit);
777 void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) {
778 X86MCInstLower MCInstLowering(*MF, *this);
779 switch (MI->getOpcode()) {
780 case TargetOpcode::DBG_VALUE:
781 llvm_unreachable("Should be handled target independently");
783 // Emit nothing here but a comment if we can.
784 case X86::Int_MemBarrier:
785 if (OutStreamer.hasRawTextSupport())
786 OutStreamer.EmitRawText(StringRef("\t#MEMBARRIER"));
791 case X86::EH_RETURN64: {
792 // Lower these as normal, but add some comments.
793 unsigned Reg = MI->getOperand(0).getReg();
794 OutStreamer.AddComment(StringRef("eh_return, addr: %") +
795 X86ATTInstPrinter::getRegisterName(Reg));
800 case X86::TAILJMPd64:
801 // Lower these as normal, but add some comments.
802 OutStreamer.AddComment("TAILCALL");
805 case X86::TLS_addr32:
806 case X86::TLS_addr64:
807 case X86::TLS_base_addr32:
808 case X86::TLS_base_addr64:
809 return LowerTlsAddr(OutStreamer, MCInstLowering, *MI);
811 case X86::MOVPC32r: {
812 // This is a pseudo op for a two instruction sequence with a label, which
819 MCSymbol *PICBase = MF->getPICBaseSymbol();
820 // FIXME: We would like an efficient form for this, so we don't have to do a
821 // lot of extra uniquing.
822 OutStreamer.EmitInstruction(MCInstBuilder(X86::CALLpcrel32)
823 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
826 OutStreamer.EmitLabel(PICBase);
829 OutStreamer.EmitInstruction(MCInstBuilder(X86::POP32r)
830 .addReg(MI->getOperand(0).getReg()));
835 // Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri.
836 if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS)
839 // Okay, we have something like:
840 // EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL)
842 // For this, we want to print something like:
843 // MYGLOBAL + (. - PICBASE)
844 // However, we can't generate a ".", so just emit a new label here and refer
846 MCSymbol *DotSym = OutContext.CreateTempSymbol();
847 OutStreamer.EmitLabel(DotSym);
849 // Now that we have emitted the label, lower the complex operand expression.
850 MCSymbol *OpSym = MCInstLowering.GetSymbolFromOperand(MI->getOperand(2));
852 const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
853 const MCExpr *PICBase =
854 MCSymbolRefExpr::Create(MF->getPICBaseSymbol(), OutContext);
855 DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
857 DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
858 DotExpr, OutContext);
860 OutStreamer.EmitInstruction(MCInstBuilder(X86::ADD32ri)
861 .addReg(MI->getOperand(0).getReg())
862 .addReg(MI->getOperand(1).getReg())
867 case TargetOpcode::STACKMAP:
868 return LowerSTACKMAP(OutStreamer, SM, *MI, Subtarget->is64Bit());
870 case TargetOpcode::PATCHPOINT:
871 return LowerPATCHPOINT(OutStreamer, SM, *MI, Subtarget->is64Bit());
873 case X86::MORESTACK_RET:
874 OutStreamer.EmitInstruction(MCInstBuilder(getRetOpcode(*Subtarget)));
877 case X86::MORESTACK_RET_RESTORE_R10:
878 // Return, then restore R10.
879 OutStreamer.EmitInstruction(MCInstBuilder(getRetOpcode(*Subtarget)));
880 OutStreamer.EmitInstruction(MCInstBuilder(X86::MOV64rr)
887 MCInstLowering.Lower(MI, TmpInst);
888 OutStreamer.EmitInstruction(TmpInst);