1 //===---- ScheduleDAGEmit.cpp - Emit routines for the ScheduleDAG class ---===//
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 implements the Emit routines for the ScheduleDAG class, which creates
11 // MachineInstrs according to the computed schedule.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "pre-RA-sched"
16 #include "ScheduleDAGSDNodes.h"
17 #include "llvm/CodeGen/MachineConstantPool.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineInstrBuilder.h"
20 #include "llvm/CodeGen/MachineRegisterInfo.h"
21 #include "llvm/Target/TargetData.h"
22 #include "llvm/Target/TargetMachine.h"
23 #include "llvm/Target/TargetInstrInfo.h"
24 #include "llvm/Target/TargetLowering.h"
25 #include "llvm/ADT/Statistic.h"
26 #include "llvm/Support/CommandLine.h"
27 #include "llvm/Support/Debug.h"
28 #include "llvm/Support/MathExtras.h"
31 /// EmitCopyFromReg - Generate machine code for an CopyFromReg node or an
32 /// implicit physical register output.
33 void ScheduleDAGSDNodes::
34 EmitCopyFromReg(SDNode *Node, unsigned ResNo, bool IsClone, bool IsCloned,
35 unsigned SrcReg, DenseMap<SDValue, unsigned> &VRBaseMap) {
37 if (TargetRegisterInfo::isVirtualRegister(SrcReg)) {
38 // Just use the input register directly!
39 SDValue Op(Node, ResNo);
42 bool isNew = VRBaseMap.insert(std::make_pair(Op, SrcReg)).second;
43 isNew = isNew; // Silence compiler warning.
44 assert(isNew && "Node emitted out of order - early");
48 // If the node is only used by a CopyToReg and the dest reg is a vreg, use
49 // the CopyToReg'd destination register instead of creating a new vreg.
51 const TargetRegisterClass *UseRC = NULL;
52 if (!IsClone && !IsCloned)
53 for (SDNode::use_iterator UI = Node->use_begin(), E = Node->use_end();
57 if (User->getOpcode() == ISD::CopyToReg &&
58 User->getOperand(2).getNode() == Node &&
59 User->getOperand(2).getResNo() == ResNo) {
60 unsigned DestReg = cast<RegisterSDNode>(User->getOperand(1))->getReg();
61 if (TargetRegisterInfo::isVirtualRegister(DestReg)) {
64 } else if (DestReg != SrcReg)
67 for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) {
68 SDValue Op = User->getOperand(i);
69 if (Op.getNode() != Node || Op.getResNo() != ResNo)
71 MVT VT = Node->getValueType(Op.getResNo());
72 if (VT == MVT::Other || VT == MVT::Flag)
75 if (User->isMachineOpcode()) {
76 const TargetInstrDesc &II = TII->get(User->getMachineOpcode());
77 const TargetRegisterClass *RC =
78 getInstrOperandRegClass(TRI, II, i+II.getNumDefs());
82 if (UseRC->hasSuperClass(RC))
85 assert((UseRC == RC || RC->hasSuperClass(UseRC)) &&
86 "Multiple uses expecting different register classes!");
96 MVT VT = Node->getValueType(ResNo);
97 const TargetRegisterClass *SrcRC = 0, *DstRC = 0;
98 SrcRC = TRI->getPhysicalRegisterRegClass(SrcReg, VT);
100 // Figure out the register class to create for the destreg.
102 DstRC = MRI.getRegClass(VRBase);
104 assert(UseRC->hasType(VT) && "Incompatible phys register def and uses!");
107 DstRC = TLI->getRegClassFor(VT);
110 // If all uses are reading from the src physical register and copying the
111 // register is either impossible or very expensive, then don't create a copy.
112 if (MatchReg && SrcRC->getCopyCost() < 0) {
115 // Create the reg, emit the copy.
116 VRBase = MRI.createVirtualRegister(DstRC);
117 bool Emitted = TII->copyRegToReg(*BB, InsertPos, VRBase, SrcReg,
120 assert(Emitted && "Unable to issue a copy instruction!\n");
124 SDValue Op(Node, ResNo);
127 bool isNew = VRBaseMap.insert(std::make_pair(Op, VRBase)).second;
128 isNew = isNew; // Silence compiler warning.
129 assert(isNew && "Node emitted out of order - early");
132 /// getDstOfCopyToRegUse - If the only use of the specified result number of
133 /// node is a CopyToReg, return its destination register. Return 0 otherwise.
134 unsigned ScheduleDAGSDNodes::getDstOfOnlyCopyToRegUse(SDNode *Node,
135 unsigned ResNo) const {
136 if (!Node->hasOneUse())
139 SDNode *User = *Node->use_begin();
140 if (User->getOpcode() == ISD::CopyToReg &&
141 User->getOperand(2).getNode() == Node &&
142 User->getOperand(2).getResNo() == ResNo) {
143 unsigned Reg = cast<RegisterSDNode>(User->getOperand(1))->getReg();
144 if (TargetRegisterInfo::isVirtualRegister(Reg))
150 void ScheduleDAGSDNodes::CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
151 const TargetInstrDesc &II,
152 bool IsClone, bool IsCloned,
153 DenseMap<SDValue, unsigned> &VRBaseMap) {
154 assert(Node->getMachineOpcode() != TargetInstrInfo::IMPLICIT_DEF &&
155 "IMPLICIT_DEF should have been handled as a special case elsewhere!");
157 for (unsigned i = 0; i < II.getNumDefs(); ++i) {
158 // If the specific node value is only used by a CopyToReg and the dest reg
159 // is a vreg in the same register class, use the CopyToReg'd destination
160 // register instead of creating a new vreg.
162 const TargetRegisterClass *RC = getInstrOperandRegClass(TRI, II, i);
164 if (!IsClone && !IsCloned)
165 for (SDNode::use_iterator UI = Node->use_begin(), E = Node->use_end();
168 if (User->getOpcode() == ISD::CopyToReg &&
169 User->getOperand(2).getNode() == Node &&
170 User->getOperand(2).getResNo() == i) {
171 unsigned Reg = cast<RegisterSDNode>(User->getOperand(1))->getReg();
172 if (TargetRegisterInfo::isVirtualRegister(Reg)) {
173 const TargetRegisterClass *RegRC = MRI.getRegClass(Reg);
176 MI->addOperand(MachineOperand::CreateReg(Reg, true));
183 // Create the result registers for this node and add the result regs to
184 // the machine instruction.
186 assert(RC && "Isn't a register operand!");
187 VRBase = MRI.createVirtualRegister(RC);
188 MI->addOperand(MachineOperand::CreateReg(VRBase, true));
194 bool isNew = VRBaseMap.insert(std::make_pair(Op, VRBase)).second;
195 isNew = isNew; // Silence compiler warning.
196 assert(isNew && "Node emitted out of order - early");
200 /// getVR - Return the virtual register corresponding to the specified result
201 /// of the specified node.
202 unsigned ScheduleDAGSDNodes::getVR(SDValue Op,
203 DenseMap<SDValue, unsigned> &VRBaseMap) {
204 if (Op.isMachineOpcode() &&
205 Op.getMachineOpcode() == TargetInstrInfo::IMPLICIT_DEF) {
206 // Add an IMPLICIT_DEF instruction before every use.
207 unsigned VReg = getDstOfOnlyCopyToRegUse(Op.getNode(), Op.getResNo());
208 // IMPLICIT_DEF can produce any type of result so its TargetInstrDesc
209 // does not include operand register class info.
211 const TargetRegisterClass *RC = TLI->getRegClassFor(Op.getValueType());
212 VReg = MRI.createVirtualRegister(RC);
214 BuildMI(BB, Op.getDebugLoc(), TII->get(TargetInstrInfo::IMPLICIT_DEF),VReg);
218 DenseMap<SDValue, unsigned>::iterator I = VRBaseMap.find(Op);
219 assert(I != VRBaseMap.end() && "Node emitted out of order - late");
224 /// AddRegisterOperand - Add the specified register as an operand to the
225 /// specified machine instr. Insert register copies if the register is
226 /// not in the required register class.
228 ScheduleDAGSDNodes::AddRegisterOperand(MachineInstr *MI, SDValue Op,
230 const TargetInstrDesc *II,
231 DenseMap<SDValue, unsigned> &VRBaseMap) {
232 assert(Op.getValueType() != MVT::Other &&
233 Op.getValueType() != MVT::Flag &&
234 "Chain and flag operands should occur at end of operand list!");
235 // Get/emit the operand.
236 unsigned VReg = getVR(Op, VRBaseMap);
237 assert(TargetRegisterInfo::isVirtualRegister(VReg) && "Not a vreg?");
239 const TargetInstrDesc &TID = MI->getDesc();
240 bool isOptDef = IIOpNum < TID.getNumOperands() &&
241 TID.OpInfo[IIOpNum].isOptionalDef();
243 // If the instruction requires a register in a different class, create
244 // a new virtual register and copy the value into it.
246 const TargetRegisterClass *SrcRC =
247 MRI.getRegClass(VReg);
248 const TargetRegisterClass *DstRC =
249 getInstrOperandRegClass(TRI, *II, IIOpNum);
250 assert((DstRC || (TID.isVariadic() && IIOpNum >= TID.getNumOperands())) &&
251 "Don't have operand info for this instruction!");
252 if (DstRC && SrcRC != DstRC && !SrcRC->hasSuperClass(DstRC)) {
253 unsigned NewVReg = MRI.createVirtualRegister(DstRC);
254 bool Emitted = TII->copyRegToReg(*BB, InsertPos, NewVReg, VReg,
256 assert(Emitted && "Unable to issue a copy instruction!\n");
262 MI->addOperand(MachineOperand::CreateReg(VReg, isOptDef));
265 /// AddOperand - Add the specified operand to the specified machine instr. II
266 /// specifies the instruction information for the node, and IIOpNum is the
267 /// operand number (in the II) that we are adding. IIOpNum and II are used for
269 void ScheduleDAGSDNodes::AddOperand(MachineInstr *MI, SDValue Op,
271 const TargetInstrDesc *II,
272 DenseMap<SDValue, unsigned> &VRBaseMap) {
273 if (Op.isMachineOpcode()) {
274 AddRegisterOperand(MI, Op, IIOpNum, II, VRBaseMap);
275 } else if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
276 MI->addOperand(MachineOperand::CreateImm(C->getZExtValue()));
277 } else if (ConstantFPSDNode *F = dyn_cast<ConstantFPSDNode>(Op)) {
278 const ConstantFP *CFP = F->getConstantFPValue();
279 MI->addOperand(MachineOperand::CreateFPImm(CFP));
280 } else if (RegisterSDNode *R = dyn_cast<RegisterSDNode>(Op)) {
281 MI->addOperand(MachineOperand::CreateReg(R->getReg(), false));
282 } else if (GlobalAddressSDNode *TGA = dyn_cast<GlobalAddressSDNode>(Op)) {
283 MI->addOperand(MachineOperand::CreateGA(TGA->getGlobal(), TGA->getOffset(),
284 TGA->getTargetFlags()));
285 } else if (BasicBlockSDNode *BBNode = dyn_cast<BasicBlockSDNode>(Op)) {
286 MI->addOperand(MachineOperand::CreateMBB(BBNode->getBasicBlock()));
287 } else if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Op)) {
288 MI->addOperand(MachineOperand::CreateFI(FI->getIndex()));
289 } else if (JumpTableSDNode *JT = dyn_cast<JumpTableSDNode>(Op)) {
290 MI->addOperand(MachineOperand::CreateJTI(JT->getIndex(),
291 JT->getTargetFlags()));
292 } else if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Op)) {
293 int Offset = CP->getOffset();
294 unsigned Align = CP->getAlignment();
295 const Type *Type = CP->getType();
296 // MachineConstantPool wants an explicit alignment.
298 Align = TM.getTargetData()->getPrefTypeAlignment(Type);
300 // Alignment of vector types. FIXME!
301 Align = TM.getTargetData()->getTypeAllocSize(Type);
306 if (CP->isMachineConstantPoolEntry())
307 Idx = ConstPool->getConstantPoolIndex(CP->getMachineCPVal(), Align);
309 Idx = ConstPool->getConstantPoolIndex(CP->getConstVal(), Align);
310 MI->addOperand(MachineOperand::CreateCPI(Idx, Offset,
311 CP->getTargetFlags()));
312 } else if (ExternalSymbolSDNode *ES = dyn_cast<ExternalSymbolSDNode>(Op)) {
313 MI->addOperand(MachineOperand::CreateES(ES->getSymbol(), 0,
314 ES->getTargetFlags()));
316 assert(Op.getValueType() != MVT::Other &&
317 Op.getValueType() != MVT::Flag &&
318 "Chain and flag operands should occur at end of operand list!");
319 AddRegisterOperand(MI, Op, IIOpNum, II, VRBaseMap);
323 /// getSuperRegisterRegClass - Returns the register class of a superreg A whose
324 /// "SubIdx"'th sub-register class is the specified register class and whose
325 /// type matches the specified type.
326 static const TargetRegisterClass*
327 getSuperRegisterRegClass(const TargetRegisterClass *TRC,
328 unsigned SubIdx, MVT VT) {
329 // Pick the register class of the superegister for this type
330 for (TargetRegisterInfo::regclass_iterator I = TRC->superregclasses_begin(),
331 E = TRC->superregclasses_end(); I != E; ++I)
332 if ((*I)->hasType(VT) && (*I)->getSubRegisterRegClass(SubIdx) == TRC)
334 assert(false && "Couldn't find the register class");
338 /// EmitSubregNode - Generate machine code for subreg nodes.
340 void ScheduleDAGSDNodes::EmitSubregNode(SDNode *Node,
341 DenseMap<SDValue, unsigned> &VRBaseMap){
343 unsigned Opc = Node->getMachineOpcode();
345 // If the node is only used by a CopyToReg and the dest reg is a vreg, use
346 // the CopyToReg'd destination register instead of creating a new vreg.
347 for (SDNode::use_iterator UI = Node->use_begin(), E = Node->use_end();
350 if (User->getOpcode() == ISD::CopyToReg &&
351 User->getOperand(2).getNode() == Node) {
352 unsigned DestReg = cast<RegisterSDNode>(User->getOperand(1))->getReg();
353 if (TargetRegisterInfo::isVirtualRegister(DestReg)) {
360 if (Opc == TargetInstrInfo::EXTRACT_SUBREG) {
361 unsigned SubIdx = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
363 // Create the extract_subreg machine instruction.
364 MachineInstr *MI = BuildMI(MF, Node->getDebugLoc(),
365 TII->get(TargetInstrInfo::EXTRACT_SUBREG));
367 // Figure out the register class to create for the destreg.
368 unsigned VReg = getVR(Node->getOperand(0), VRBaseMap);
369 const TargetRegisterClass *TRC = MRI.getRegClass(VReg);
370 const TargetRegisterClass *SRC = TRC->getSubRegisterRegClass(SubIdx);
371 assert(SRC && "Invalid subregister index in EXTRACT_SUBREG");
373 // Figure out the register class to create for the destreg.
374 // Note that if we're going to directly use an existing register,
375 // it must be precisely the required class, and not a subclass
377 if (VRBase == 0 || SRC != MRI.getRegClass(VRBase)) {
379 assert(SRC && "Couldn't find source register class");
380 VRBase = MRI.createVirtualRegister(SRC);
383 // Add def, source, and subreg index
384 MI->addOperand(MachineOperand::CreateReg(VRBase, true));
385 AddOperand(MI, Node->getOperand(0), 0, 0, VRBaseMap);
386 MI->addOperand(MachineOperand::CreateImm(SubIdx));
387 BB->insert(InsertPos, MI);
388 } else if (Opc == TargetInstrInfo::INSERT_SUBREG ||
389 Opc == TargetInstrInfo::SUBREG_TO_REG) {
390 SDValue N0 = Node->getOperand(0);
391 SDValue N1 = Node->getOperand(1);
392 SDValue N2 = Node->getOperand(2);
393 unsigned SubReg = getVR(N1, VRBaseMap);
394 unsigned SubIdx = cast<ConstantSDNode>(N2)->getZExtValue();
395 const TargetRegisterClass *TRC = MRI.getRegClass(SubReg);
396 const TargetRegisterClass *SRC =
397 getSuperRegisterRegClass(TRC, SubIdx,
398 Node->getValueType(0));
400 // Figure out the register class to create for the destreg.
401 // Note that if we're going to directly use an existing register,
402 // it must be precisely the required class, and not a subclass
404 if (VRBase == 0 || SRC != MRI.getRegClass(VRBase)) {
406 assert(SRC && "Couldn't find source register class");
407 VRBase = MRI.createVirtualRegister(SRC);
410 // Create the insert_subreg or subreg_to_reg machine instruction.
411 MachineInstr *MI = BuildMI(MF, Node->getDebugLoc(), TII->get(Opc));
412 MI->addOperand(MachineOperand::CreateReg(VRBase, true));
414 // If creating a subreg_to_reg, then the first input operand
415 // is an implicit value immediate, otherwise it's a register
416 if (Opc == TargetInstrInfo::SUBREG_TO_REG) {
417 const ConstantSDNode *SD = cast<ConstantSDNode>(N0);
418 MI->addOperand(MachineOperand::CreateImm(SD->getZExtValue()));
420 AddOperand(MI, N0, 0, 0, VRBaseMap);
421 // Add the subregster being inserted
422 AddOperand(MI, N1, 0, 0, VRBaseMap);
423 MI->addOperand(MachineOperand::CreateImm(SubIdx));
424 BB->insert(InsertPos, MI);
426 assert(0 && "Node is not insert_subreg, extract_subreg, or subreg_to_reg");
429 bool isNew = VRBaseMap.insert(std::make_pair(Op, VRBase)).second;
430 isNew = isNew; // Silence compiler warning.
431 assert(isNew && "Node emitted out of order - early");
434 /// EmitCopyToRegClassNode - Generate machine code for COPY_TO_REGCLASS nodes.
435 /// COPY_TO_REGCLASS is just a normal copy, except that the destination
436 /// register is constrained to be in a particular register class.
439 ScheduleDAGSDNodes::EmitCopyToRegClassNode(SDNode *Node,
440 DenseMap<SDValue, unsigned> &VRBaseMap) {
441 unsigned VReg = getVR(Node->getOperand(0), VRBaseMap);
442 const TargetRegisterClass *SrcRC = MRI.getRegClass(VReg);
444 unsigned DstRCIdx = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
445 const TargetRegisterClass *DstRC = TRI->getRegClass(DstRCIdx);
447 // Create the new VReg in the destination class and emit a copy.
448 unsigned NewVReg = MRI.createVirtualRegister(DstRC);
449 bool Emitted = TII->copyRegToReg(*BB, InsertPos, NewVReg, VReg,
452 "Unable to issue a copy instruction for a COPY_TO_REGCLASS node!\n");
456 bool isNew = VRBaseMap.insert(std::make_pair(Op, NewVReg)).second;
457 isNew = isNew; // Silence compiler warning.
458 assert(isNew && "Node emitted out of order - early");
461 /// EmitNode - Generate machine code for an node and needed dependencies.
463 void ScheduleDAGSDNodes::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
464 DenseMap<SDValue, unsigned> &VRBaseMap) {
465 // If machine instruction
466 if (Node->isMachineOpcode()) {
467 unsigned Opc = Node->getMachineOpcode();
469 // Handle subreg insert/extract specially
470 if (Opc == TargetInstrInfo::EXTRACT_SUBREG ||
471 Opc == TargetInstrInfo::INSERT_SUBREG ||
472 Opc == TargetInstrInfo::SUBREG_TO_REG) {
473 EmitSubregNode(Node, VRBaseMap);
477 // Handle COPY_TO_REGCLASS specially.
478 if (Opc == TargetInstrInfo::COPY_TO_REGCLASS) {
479 EmitCopyToRegClassNode(Node, VRBaseMap);
483 if (Opc == TargetInstrInfo::IMPLICIT_DEF)
484 // We want a unique VR for each IMPLICIT_DEF use.
487 const TargetInstrDesc &II = TII->get(Opc);
488 unsigned NumResults = CountResults(Node);
489 unsigned NodeOperands = CountOperands(Node);
490 unsigned MemOperandsEnd = ComputeMemOperandsEnd(Node);
491 bool HasPhysRegOuts = (NumResults > II.getNumDefs()) &&
492 II.getImplicitDefs() != 0;
494 unsigned NumMIOperands = NodeOperands + NumResults;
495 assert((II.getNumOperands() == NumMIOperands ||
496 HasPhysRegOuts || II.isVariadic()) &&
497 "#operands for dag node doesn't match .td file!");
500 // Create the new machine instruction.
501 MachineInstr *MI = BuildMI(MF, Node->getDebugLoc(), II);
503 // Add result register values for things that are defined by this
506 CreateVirtualRegisters(Node, MI, II, IsClone, IsCloned, VRBaseMap);
508 // Emit all of the actual operands of this instruction, adding them to the
509 // instruction as appropriate.
510 for (unsigned i = 0; i != NodeOperands; ++i)
511 AddOperand(MI, Node->getOperand(i), i+II.getNumDefs(), &II, VRBaseMap);
513 // Emit all of the memory operands of this instruction
514 for (unsigned i = NodeOperands; i != MemOperandsEnd; ++i)
515 AddMemOperand(MI, cast<MemOperandSDNode>(Node->getOperand(i))->MO);
517 if (II.usesCustomDAGSchedInsertionHook()) {
518 // Insert this instruction into the basic block using a target
519 // specific inserter which may returns a new basic block.
520 BB = TLI->EmitInstrWithCustomInserter(MI, BB);
521 InsertPos = BB->end();
523 BB->insert(InsertPos, MI);
526 // Additional results must be an physical register def.
527 if (HasPhysRegOuts) {
528 for (unsigned i = II.getNumDefs(); i < NumResults; ++i) {
529 unsigned Reg = II.getImplicitDefs()[i - II.getNumDefs()];
530 if (Node->hasAnyUseOfValue(i))
531 EmitCopyFromReg(Node, i, IsClone, IsCloned, Reg, VRBaseMap);
537 switch (Node->getOpcode()) {
542 assert(0 && "This target-independent node should have been selected!");
544 case ISD::EntryToken:
545 assert(0 && "EntryToken should have been excluded from the schedule!");
547 case ISD::TokenFactor: // fall thru
549 case ISD::CopyToReg: {
551 SDValue SrcVal = Node->getOperand(2);
552 if (RegisterSDNode *R = dyn_cast<RegisterSDNode>(SrcVal))
553 SrcReg = R->getReg();
555 SrcReg = getVR(SrcVal, VRBaseMap);
557 unsigned DestReg = cast<RegisterSDNode>(Node->getOperand(1))->getReg();
558 if (SrcReg == DestReg) // Coalesced away the copy? Ignore.
561 const TargetRegisterClass *SrcTRC = 0, *DstTRC = 0;
562 // Get the register classes of the src/dst.
563 if (TargetRegisterInfo::isVirtualRegister(SrcReg))
564 SrcTRC = MRI.getRegClass(SrcReg);
566 SrcTRC = TRI->getPhysicalRegisterRegClass(SrcReg,SrcVal.getValueType());
568 if (TargetRegisterInfo::isVirtualRegister(DestReg))
569 DstTRC = MRI.getRegClass(DestReg);
571 DstTRC = TRI->getPhysicalRegisterRegClass(DestReg,
572 Node->getOperand(1).getValueType());
574 bool Emitted = TII->copyRegToReg(*BB, InsertPos, DestReg, SrcReg,
576 assert(Emitted && "Unable to issue a copy instruction!\n");
580 case ISD::CopyFromReg: {
581 unsigned SrcReg = cast<RegisterSDNode>(Node->getOperand(1))->getReg();
582 EmitCopyFromReg(Node, 0, IsClone, IsCloned, SrcReg, VRBaseMap);
585 case ISD::INLINEASM: {
586 unsigned NumOps = Node->getNumOperands();
587 if (Node->getOperand(NumOps-1).getValueType() == MVT::Flag)
588 --NumOps; // Ignore the flag operand.
590 // Create the inline asm machine instruction.
591 MachineInstr *MI = BuildMI(MF, Node->getDebugLoc(),
592 TII->get(TargetInstrInfo::INLINEASM));
594 // Add the asm string as an external symbol operand.
596 cast<ExternalSymbolSDNode>(Node->getOperand(1))->getSymbol();
597 MI->addOperand(MachineOperand::CreateES(AsmStr));
599 // Add all of the operand registers to the instruction.
600 for (unsigned i = 2; i != NumOps;) {
602 cast<ConstantSDNode>(Node->getOperand(i))->getZExtValue();
603 unsigned NumVals = InlineAsm::getNumOperandRegisters(Flags);
605 MI->addOperand(MachineOperand::CreateImm(Flags));
606 ++i; // Skip the ID value.
609 default: assert(0 && "Bad flags!");
610 case 2: // Def of register.
611 for (; NumVals; --NumVals, ++i) {
612 unsigned Reg = cast<RegisterSDNode>(Node->getOperand(i))->getReg();
613 MI->addOperand(MachineOperand::CreateReg(Reg, true));
616 case 6: // Def of earlyclobber register.
617 for (; NumVals; --NumVals, ++i) {
618 unsigned Reg = cast<RegisterSDNode>(Node->getOperand(i))->getReg();
619 MI->addOperand(MachineOperand::CreateReg(Reg, true, false, false,
623 case 1: // Use of register.
624 case 3: // Immediate.
625 case 4: // Addressing mode.
626 // The addressing mode has been selected, just add all of the
627 // operands to the machine instruction.
628 for (; NumVals; --NumVals, ++i)
629 AddOperand(MI, Node->getOperand(i), 0, 0, VRBaseMap);
633 BB->insert(InsertPos, MI);
639 /// EmitSchedule - Emit the machine code in scheduled order.
640 MachineBasicBlock *ScheduleDAGSDNodes::EmitSchedule() {
641 DenseMap<SDValue, unsigned> VRBaseMap;
642 DenseMap<SUnit*, unsigned> CopyVRBaseMap;
643 for (unsigned i = 0, e = Sequence.size(); i != e; i++) {
644 SUnit *SU = Sequence[i];
646 // Null SUnit* is a noop.
651 // For pre-regalloc scheduling, create instructions corresponding to the
652 // SDNode and any flagged SDNodes and append them to the block.
653 if (!SU->getNode()) {
655 EmitPhysRegCopy(SU, CopyVRBaseMap);
659 SmallVector<SDNode *, 4> FlaggedNodes;
660 for (SDNode *N = SU->getNode()->getFlaggedNode(); N;
661 N = N->getFlaggedNode())
662 FlaggedNodes.push_back(N);
663 while (!FlaggedNodes.empty()) {
664 EmitNode(FlaggedNodes.back(), SU->OrigNode != SU, SU->isCloned,VRBaseMap);
665 FlaggedNodes.pop_back();
667 EmitNode(SU->getNode(), SU->OrigNode != SU, SU->isCloned, VRBaseMap);