2 //***************************************************************************
4 // SparcInstrSelection.cpp
7 // BURS instruction selection for SPARC V9 architecture.
10 // 7/02/01 - Vikram Adve - Created
11 //**************************************************************************/
13 #include "SparcInternals.h"
14 #include "SparcInstrSelectionSupport.h"
15 #include "SparcRegClassInfo.h"
16 #include "llvm/CodeGen/InstrSelectionSupport.h"
17 #include "llvm/CodeGen/MachineInstr.h"
18 #include "llvm/CodeGen/InstrForest.h"
19 #include "llvm/CodeGen/InstrSelection.h"
20 #include "llvm/CodeGen/MachineCodeForMethod.h"
21 #include "llvm/CodeGen/MachineCodeForInstruction.h"
22 #include "llvm/DerivedTypes.h"
23 #include "llvm/iTerminators.h"
24 #include "llvm/iMemory.h"
25 #include "llvm/iOther.h"
26 #include "llvm/BasicBlock.h"
27 #include "llvm/Function.h"
28 #include "llvm/ConstantVals.h"
29 #include "Support/MathExtras.h"
33 //************************* Forward Declarations ***************************/
36 static void SetMemOperands_Internal (vector<MachineInstr*>& mvec,
37 vector<MachineInstr*>::iterator mvecI,
38 const InstructionNode* vmInstrNode,
40 std::vector<Value*>& idxVec,
41 const TargetMachine& target);
44 //************************ Internal Functions ******************************/
47 static inline MachineOpCode
48 ChooseBprInstruction(const InstructionNode* instrNode)
52 Instruction* setCCInstr =
53 ((InstructionNode*) instrNode->leftChild())->getInstruction();
55 switch(setCCInstr->getOpcode())
57 case Instruction::SetEQ: opCode = BRZ; break;
58 case Instruction::SetNE: opCode = BRNZ; break;
59 case Instruction::SetLE: opCode = BRLEZ; break;
60 case Instruction::SetGE: opCode = BRGEZ; break;
61 case Instruction::SetLT: opCode = BRLZ; break;
62 case Instruction::SetGT: opCode = BRGZ; break;
64 assert(0 && "Unrecognized VM instruction!");
65 opCode = INVALID_OPCODE;
73 static inline MachineOpCode
74 ChooseBpccInstruction(const InstructionNode* instrNode,
75 const BinaryOperator* setCCInstr)
77 MachineOpCode opCode = INVALID_OPCODE;
79 bool isSigned = setCCInstr->getOperand(0)->getType()->isSigned();
83 switch(setCCInstr->getOpcode())
85 case Instruction::SetEQ: opCode = BE; break;
86 case Instruction::SetNE: opCode = BNE; break;
87 case Instruction::SetLE: opCode = BLE; break;
88 case Instruction::SetGE: opCode = BGE; break;
89 case Instruction::SetLT: opCode = BL; break;
90 case Instruction::SetGT: opCode = BG; break;
92 assert(0 && "Unrecognized VM instruction!");
98 switch(setCCInstr->getOpcode())
100 case Instruction::SetEQ: opCode = BE; break;
101 case Instruction::SetNE: opCode = BNE; break;
102 case Instruction::SetLE: opCode = BLEU; break;
103 case Instruction::SetGE: opCode = BCC; break;
104 case Instruction::SetLT: opCode = BCS; break;
105 case Instruction::SetGT: opCode = BGU; break;
107 assert(0 && "Unrecognized VM instruction!");
115 static inline MachineOpCode
116 ChooseBFpccInstruction(const InstructionNode* instrNode,
117 const BinaryOperator* setCCInstr)
119 MachineOpCode opCode = INVALID_OPCODE;
121 switch(setCCInstr->getOpcode())
123 case Instruction::SetEQ: opCode = FBE; break;
124 case Instruction::SetNE: opCode = FBNE; break;
125 case Instruction::SetLE: opCode = FBLE; break;
126 case Instruction::SetGE: opCode = FBGE; break;
127 case Instruction::SetLT: opCode = FBL; break;
128 case Instruction::SetGT: opCode = FBG; break;
130 assert(0 && "Unrecognized VM instruction!");
138 // Create a unique TmpInstruction for a boolean value,
139 // representing the CC register used by a branch on that value.
140 // For now, hack this using a little static cache of TmpInstructions.
141 // Eventually the entire BURG instruction selection should be put
142 // into a separate class that can hold such information.
143 // The static cache is not too bad because the memory for these
144 // TmpInstructions will be freed along with the rest of the Function anyway.
146 static TmpInstruction*
147 GetTmpForCC(Value* boolVal, const Function *F, const Type* ccType)
149 typedef std::hash_map<const Value*, TmpInstruction*> BoolTmpCache;
150 static BoolTmpCache boolToTmpCache; // Map boolVal -> TmpInstruction*
151 static const Function *lastFunction = 0;// Use to flush cache between funcs
153 assert(boolVal->getType() == Type::BoolTy && "Weird but ok! Delete assert");
155 if (lastFunction != F)
158 boolToTmpCache.clear();
161 // Look for tmpI and create a new one otherwise. The new value is
162 // directly written to map using the ref returned by operator[].
163 TmpInstruction*& tmpI = boolToTmpCache[boolVal];
165 tmpI = new TmpInstruction(ccType, boolVal);
171 static inline MachineOpCode
172 ChooseBccInstruction(const InstructionNode* instrNode,
175 InstructionNode* setCCNode = (InstructionNode*) instrNode->leftChild();
176 BinaryOperator* setCCInstr = (BinaryOperator*) setCCNode->getInstruction();
177 const Type* setCCType = setCCInstr->getOperand(0)->getType();
179 isFPBranch = (setCCType == Type::FloatTy || setCCType == Type::DoubleTy);
182 return ChooseBFpccInstruction(instrNode, setCCInstr);
184 return ChooseBpccInstruction(instrNode, setCCInstr);
188 static inline MachineOpCode
189 ChooseMovFpccInstruction(const InstructionNode* instrNode)
191 MachineOpCode opCode = INVALID_OPCODE;
193 switch(instrNode->getInstruction()->getOpcode())
195 case Instruction::SetEQ: opCode = MOVFE; break;
196 case Instruction::SetNE: opCode = MOVFNE; break;
197 case Instruction::SetLE: opCode = MOVFLE; break;
198 case Instruction::SetGE: opCode = MOVFGE; break;
199 case Instruction::SetLT: opCode = MOVFL; break;
200 case Instruction::SetGT: opCode = MOVFG; break;
202 assert(0 && "Unrecognized VM instruction!");
210 // Assumes that SUBcc v1, v2 -> v3 has been executed.
211 // In most cases, we want to clear v3 and then follow it by instruction
213 // Set mustClearReg=false if v3 need not be cleared before conditional move.
214 // Set valueToMove=0 if we want to conditionally move 0 instead of 1
215 // (i.e., we want to test inverse of a condition)
216 // (The latter two cases do not seem to arise because SetNE needs nothing.)
219 ChooseMovpccAfterSub(const InstructionNode* instrNode,
223 MachineOpCode opCode = INVALID_OPCODE;
227 switch(instrNode->getInstruction()->getOpcode())
229 case Instruction::SetEQ: opCode = MOVE; break;
230 case Instruction::SetLE: opCode = MOVLE; break;
231 case Instruction::SetGE: opCode = MOVGE; break;
232 case Instruction::SetLT: opCode = MOVL; break;
233 case Instruction::SetGT: opCode = MOVG; break;
234 case Instruction::SetNE: assert(0 && "No move required!"); break;
235 default: assert(0 && "Unrecognized VM instr!"); break;
241 static inline MachineOpCode
242 ChooseConvertToFloatInstr(const InstructionNode* instrNode,
245 MachineOpCode opCode = INVALID_OPCODE;
247 switch(instrNode->getOpLabel())
250 if (opType == Type::SByteTy || opType == Type::ShortTy || opType == Type::IntTy)
252 else if (opType == Type::LongTy)
254 else if (opType == Type::DoubleTy)
256 else if (opType == Type::FloatTy)
259 assert(0 && "Cannot convert this type to FLOAT on SPARC");
263 // This is usually used in conjunction with CreateCodeToCopyIntToFloat().
264 // Both functions should treat the integer as a 32-bit value for types
265 // of 4 bytes or less, and as a 64-bit value otherwise.
266 if (opType == Type::SByteTy || opType == Type::UByteTy ||
267 opType == Type::ShortTy || opType == Type::UShortTy ||
268 opType == Type::IntTy || opType == Type::UIntTy)
270 else if (opType == Type::LongTy || opType == Type::ULongTy)
272 else if (opType == Type::FloatTy)
274 else if (opType == Type::DoubleTy)
277 assert(0 && "Cannot convert this type to DOUBLE on SPARC");
287 static inline MachineOpCode
288 ChooseConvertToIntInstr(const InstructionNode* instrNode,
291 MachineOpCode opCode = INVALID_OPCODE;;
293 int instrType = (int) instrNode->getOpLabel();
295 if (instrType == ToSByteTy || instrType == ToShortTy || instrType == ToIntTy)
297 switch (opType->getPrimitiveID())
299 case Type::FloatTyID: opCode = FSTOI; break;
300 case Type::DoubleTyID: opCode = FDTOI; break;
302 assert(0 && "Non-numeric non-bool type cannot be converted to Int");
306 else if (instrType == ToLongTy)
308 switch (opType->getPrimitiveID())
310 case Type::FloatTyID: opCode = FSTOX; break;
311 case Type::DoubleTyID: opCode = FDTOX; break;
313 assert(0 && "Non-numeric non-bool type cannot be converted to Long");
318 assert(0 && "Should not get here, Mo!");
324 static inline MachineOpCode
325 ChooseAddInstructionByType(const Type* resultType)
327 MachineOpCode opCode = INVALID_OPCODE;
329 if (resultType->isIntegral() ||
330 isa<PointerType>(resultType) ||
331 isa<FunctionType>(resultType) ||
332 resultType == Type::LabelTy ||
333 resultType == Type::BoolTy)
338 switch(resultType->getPrimitiveID())
340 case Type::FloatTyID: opCode = FADDS; break;
341 case Type::DoubleTyID: opCode = FADDD; break;
342 default: assert(0 && "Invalid type for ADD instruction"); break;
349 static inline MachineOpCode
350 ChooseAddInstruction(const InstructionNode* instrNode)
352 return ChooseAddInstructionByType(instrNode->getInstruction()->getType());
356 static inline MachineInstr*
357 CreateMovFloatInstruction(const InstructionNode* instrNode,
358 const Type* resultType)
360 MachineInstr* minstr = new MachineInstr((resultType == Type::FloatTy)
362 minstr->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
363 instrNode->leftChild()->getValue());
364 minstr->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister,
365 instrNode->getValue());
369 static inline MachineInstr*
370 CreateAddConstInstruction(const InstructionNode* instrNode)
372 MachineInstr* minstr = NULL;
374 Value* constOp = ((InstrTreeNode*) instrNode->rightChild())->getValue();
375 assert(isa<Constant>(constOp));
377 // Cases worth optimizing are:
378 // (1) Add with 0 for float or double: use an FMOV of appropriate type,
379 // instead of an FADD (1 vs 3 cycles). There is no integer MOV.
381 const Type* resultType = instrNode->getInstruction()->getType();
383 if (resultType == Type::FloatTy ||
384 resultType == Type::DoubleTy)
386 double dval = cast<ConstantFP>(constOp)->getValue();
388 minstr = CreateMovFloatInstruction(instrNode, resultType);
395 static inline MachineOpCode
396 ChooseSubInstructionByType(const Type* resultType)
398 MachineOpCode opCode = INVALID_OPCODE;
400 if (resultType->isIntegral() ||
401 resultType->isPointerType())
406 switch(resultType->getPrimitiveID())
408 case Type::FloatTyID: opCode = FSUBS; break;
409 case Type::DoubleTyID: opCode = FSUBD; break;
410 default: assert(0 && "Invalid type for SUB instruction"); break;
417 static inline MachineInstr*
418 CreateSubConstInstruction(const InstructionNode* instrNode)
420 MachineInstr* minstr = NULL;
422 Value* constOp = ((InstrTreeNode*) instrNode->rightChild())->getValue();
423 assert(isa<Constant>(constOp));
425 // Cases worth optimizing are:
426 // (1) Sub with 0 for float or double: use an FMOV of appropriate type,
427 // instead of an FSUB (1 vs 3 cycles). There is no integer MOV.
429 const Type* resultType = instrNode->getInstruction()->getType();
431 if (resultType == Type::FloatTy ||
432 resultType == Type::DoubleTy)
434 double dval = cast<ConstantFP>(constOp)->getValue();
436 minstr = CreateMovFloatInstruction(instrNode, resultType);
443 static inline MachineOpCode
444 ChooseFcmpInstruction(const InstructionNode* instrNode)
446 MachineOpCode opCode = INVALID_OPCODE;
448 Value* operand = ((InstrTreeNode*) instrNode->leftChild())->getValue();
449 switch(operand->getType()->getPrimitiveID()) {
450 case Type::FloatTyID: opCode = FCMPS; break;
451 case Type::DoubleTyID: opCode = FCMPD; break;
452 default: assert(0 && "Invalid type for FCMP instruction"); break;
459 // Assumes that leftArg and rightArg are both cast instructions.
462 BothFloatToDouble(const InstructionNode* instrNode)
464 InstrTreeNode* leftArg = instrNode->leftChild();
465 InstrTreeNode* rightArg = instrNode->rightChild();
466 InstrTreeNode* leftArgArg = leftArg->leftChild();
467 InstrTreeNode* rightArgArg = rightArg->leftChild();
468 assert(leftArg->getValue()->getType() == rightArg->getValue()->getType());
470 // Check if both arguments are floats cast to double
471 return (leftArg->getValue()->getType() == Type::DoubleTy &&
472 leftArgArg->getValue()->getType() == Type::FloatTy &&
473 rightArgArg->getValue()->getType() == Type::FloatTy);
477 static inline MachineOpCode
478 ChooseMulInstructionByType(const Type* resultType)
480 MachineOpCode opCode = INVALID_OPCODE;
482 if (resultType->isIntegral())
485 switch(resultType->getPrimitiveID())
487 case Type::FloatTyID: opCode = FMULS; break;
488 case Type::DoubleTyID: opCode = FMULD; break;
489 default: assert(0 && "Invalid type for MUL instruction"); break;
497 static inline MachineInstr*
498 CreateIntNegInstruction(const TargetMachine& target,
501 MachineInstr* minstr = new MachineInstr(SUB);
502 minstr->SetMachineOperandReg(0, target.getRegInfo().getZeroRegNum());
503 minstr->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister, vreg);
504 minstr->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister, vreg);
509 // Does not create any instructions if we cannot exploit constant to
510 // create a cheaper instruction.
511 // This returns the approximate cost of the instructions generated,
512 // which is used to pick the cheapest when both operands are constant.
513 static inline unsigned int
514 CreateMulConstInstruction(const TargetMachine &target,
515 Value* lval, Value* rval, Value* destVal,
516 vector<MachineInstr*>& mvec)
518 /* An integer multiply is generally more costly than FP multiply */
519 unsigned int cost = target.getInstrInfo().minLatency(MULX);
520 MachineInstr* minstr1 = NULL;
521 MachineInstr* minstr2 = NULL;
523 Value* constOp = rval;
524 if (! isa<Constant>(constOp))
527 // Cases worth optimizing are:
528 // (1) Multiply by 0 or 1 for any type: replace with copy (ADD or FMOV)
529 // (2) Multiply by 2^x for integer types: replace with Shift
531 const Type* resultType = destVal->getType();
533 if (resultType->isIntegral() || resultType->isPointerType())
537 int64_t C = GetConstantValueAsSignedInt(constOp, isValidConst);
540 bool needNeg = false;
547 if (C == 0 || C == 1)
549 cost = target.getInstrInfo().minLatency(ADD);
550 minstr1 = new MachineInstr(ADD);
552 minstr1->SetMachineOperandReg(0,
553 target.getRegInfo().getZeroRegNum());
555 minstr1->SetMachineOperandVal(0,
556 MachineOperand::MO_VirtualRegister, lval);
557 minstr1->SetMachineOperandReg(1,
558 target.getRegInfo().getZeroRegNum());
560 else if (IsPowerOf2(C, pow))
562 minstr1 = new MachineInstr((resultType == Type::LongTy)
564 minstr1->SetMachineOperandVal(0,
565 MachineOperand::MO_VirtualRegister, lval);
566 minstr1->SetMachineOperandConst(1,
567 MachineOperand::MO_UnextendedImmed, pow);
570 if (minstr1 && needNeg)
571 { // insert <reg = SUB 0, reg> after the instr to flip the sign
572 minstr2 = CreateIntNegInstruction(target, destVal);
573 cost += target.getInstrInfo().minLatency(minstr2->getOpCode());
579 if (resultType == Type::FloatTy ||
580 resultType == Type::DoubleTy)
582 double dval = cast<ConstantFP>(constOp)->getValue();
585 bool needNeg = (dval < 0);
587 MachineOpCode opCode = needNeg
588 ? (resultType == Type::FloatTy? FNEGS : FNEGD)
589 : (resultType == Type::FloatTy? FMOVS : FMOVD);
591 minstr1 = new MachineInstr(opCode);
592 minstr1->SetMachineOperandVal(0,
593 MachineOperand::MO_VirtualRegister,
600 minstr1->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,
605 mvec.push_back(minstr1);
606 cost = target.getInstrInfo().minLatency(minstr1->getOpCode());
610 assert(minstr1 && "Otherwise cost needs to be initialized to 0");
611 cost += target.getInstrInfo().minLatency(minstr2->getOpCode());
612 mvec.push_back(minstr2);
619 // Does not create any instructions if we cannot exploit constant to
620 // create a cheaper instruction.
623 CreateCheapestMulConstInstruction(const TargetMachine &target,
624 Value* lval, Value* rval, Value* destVal,
625 vector<MachineInstr*>& mvec)
628 if (isa<Constant>(lval) && isa<Constant>(rval))
629 { // both operands are constant: try both orders!
630 vector<MachineInstr*> mvec1, mvec2;
631 unsigned int lcost = CreateMulConstInstruction(target, lval, rval,
633 unsigned int rcost = CreateMulConstInstruction(target, rval, lval,
635 vector<MachineInstr*>& mincostMvec = (lcost <= rcost)? mvec1 : mvec2;
636 vector<MachineInstr*>& maxcostMvec = (lcost <= rcost)? mvec2 : mvec1;
637 mvec.insert(mvec.end(), mincostMvec.begin(), mincostMvec.end());
639 for (unsigned int i=0; i < maxcostMvec.size(); ++i)
640 delete maxcostMvec[i];
642 else if (isa<Constant>(rval)) // rval is constant, but not lval
643 CreateMulConstInstruction(target, lval, rval, destVal, mvec);
644 else if (isa<Constant>(lval)) // lval is constant, but not rval
645 CreateMulConstInstruction(target, lval, rval, destVal, mvec);
647 // else neither is constant
651 // Return NULL if we cannot exploit constant to create a cheaper instruction
653 CreateMulInstruction(const TargetMachine &target,
654 Value* lval, Value* rval, Value* destVal,
655 vector<MachineInstr*>& mvec,
656 MachineOpCode forceMulOp = INVALID_MACHINE_OPCODE)
658 unsigned int L = mvec.size();
659 CreateCheapestMulConstInstruction(target, lval, rval, destVal, mvec);
660 if (mvec.size() == L)
661 { // no instructions were added so create MUL reg, reg, reg.
662 // Use FSMULD if both operands are actually floats cast to doubles.
663 // Otherwise, use the default opcode for the appropriate type.
664 MachineOpCode mulOp = ((forceMulOp != INVALID_MACHINE_OPCODE)
666 : ChooseMulInstructionByType(destVal->getType()));
667 MachineInstr* M = new MachineInstr(mulOp);
668 M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister, lval);
669 M->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister, rval);
670 M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister, destVal);
676 // Generate a divide instruction for Div or Rem.
677 // For Rem, this assumes that the operand type will be signed if the result
678 // type is signed. This is correct because they must have the same sign.
680 static inline MachineOpCode
681 ChooseDivInstruction(TargetMachine &target,
682 const InstructionNode* instrNode)
684 MachineOpCode opCode = INVALID_OPCODE;
686 const Type* resultType = instrNode->getInstruction()->getType();
688 if (resultType->isIntegral())
689 opCode = resultType->isSigned()? SDIVX : UDIVX;
691 switch(resultType->getPrimitiveID())
693 case Type::FloatTyID: opCode = FDIVS; break;
694 case Type::DoubleTyID: opCode = FDIVD; break;
695 default: assert(0 && "Invalid type for DIV instruction"); break;
702 // Return NULL if we cannot exploit constant to create a cheaper instruction
704 CreateDivConstInstruction(TargetMachine &target,
705 const InstructionNode* instrNode,
706 vector<MachineInstr*>& mvec)
708 MachineInstr* minstr1 = NULL;
709 MachineInstr* minstr2 = NULL;
711 Value* constOp = ((InstrTreeNode*) instrNode->rightChild())->getValue();
712 if (! isa<Constant>(constOp))
715 // Cases worth optimizing are:
716 // (1) Divide by 1 for any type: replace with copy (ADD or FMOV)
717 // (2) Divide by 2^x for integer types: replace with SR[L or A]{X}
719 const Type* resultType = instrNode->getInstruction()->getType();
721 if (resultType->isIntegral())
725 int64_t C = GetConstantValueAsSignedInt(constOp, isValidConst);
728 bool needNeg = false;
737 minstr1 = new MachineInstr(ADD);
738 minstr1->SetMachineOperandVal(0,
739 MachineOperand::MO_VirtualRegister,
740 instrNode->leftChild()->getValue());
741 minstr1->SetMachineOperandReg(1,
742 target.getRegInfo().getZeroRegNum());
744 else if (IsPowerOf2(C, pow))
746 MachineOpCode opCode= ((resultType->isSigned())
747 ? (resultType==Type::LongTy)? SRAX : SRA
748 : (resultType==Type::LongTy)? SRLX : SRL);
749 minstr1 = new MachineInstr(opCode);
750 minstr1->SetMachineOperandVal(0,
751 MachineOperand::MO_VirtualRegister,
752 instrNode->leftChild()->getValue());
753 minstr1->SetMachineOperandConst(1,
754 MachineOperand::MO_UnextendedImmed,
758 if (minstr1 && needNeg)
759 { // insert <reg = SUB 0, reg> after the instr to flip the sign
760 minstr2 = CreateIntNegInstruction(target,
761 instrNode->getValue());
767 if (resultType == Type::FloatTy ||
768 resultType == Type::DoubleTy)
770 double dval = cast<ConstantFP>(constOp)->getValue();
773 bool needNeg = (dval < 0);
775 MachineOpCode opCode = needNeg
776 ? (resultType == Type::FloatTy? FNEGS : FNEGD)
777 : (resultType == Type::FloatTy? FMOVS : FMOVD);
779 minstr1 = new MachineInstr(opCode);
780 minstr1->SetMachineOperandVal(0,
781 MachineOperand::MO_VirtualRegister,
782 instrNode->leftChild()->getValue());
788 minstr1->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,
789 instrNode->getValue());
792 mvec.push_back(minstr1);
794 mvec.push_back(minstr2);
799 CreateCodeForVariableSizeAlloca(const TargetMachine& target,
802 Value* numElementsVal,
803 vector<MachineInstr*>& getMvec)
807 // Create a Value to hold the (constant) element size
808 Value* tsizeVal = ConstantSInt::get(Type::IntTy, tsize);
810 // Get the constant offset from SP for dynamically allocated storage
811 // and create a temporary Value to hold it.
812 assert(result && result->getParent() && "Result value is not part of a fn?");
813 Function *F = result->getParent()->getParent();
814 MachineCodeForMethod& mcInfo = MachineCodeForMethod::get(F);
816 ConstantSInt* dynamicAreaOffset =
817 ConstantSInt::get(Type::IntTy,
818 target.getFrameInfo().getDynamicAreaOffset(mcInfo,growUp));
819 assert(! growUp && "Has SPARC v9 stack frame convention changed?");
821 // Create a temporary value to hold the result of MUL
822 TmpInstruction* tmpProd = new TmpInstruction(numElementsVal, tsizeVal);
823 MachineCodeForInstruction::get(result).addTemp(tmpProd);
825 // Instruction 1: mul numElements, typeSize -> tmpProd
826 M = new MachineInstr(MULX);
827 M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister, numElementsVal);
828 M->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister, tsizeVal);
829 M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister, tmpProd);
830 getMvec.push_back(M);
832 // Instruction 2: sub %sp, tmpProd -> %sp
833 M = new MachineInstr(SUB);
834 M->SetMachineOperandReg(0, target.getRegInfo().getStackPointer());
835 M->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister, tmpProd);
836 M->SetMachineOperandReg(2, target.getRegInfo().getStackPointer());
837 getMvec.push_back(M);
839 // Instruction 3: add %sp, frameSizeBelowDynamicArea -> result
840 M = new MachineInstr(ADD);
841 M->SetMachineOperandReg(0, target.getRegInfo().getStackPointer());
842 M->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister, dynamicAreaOffset);
843 M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister, result);
844 getMvec.push_back(M);
849 CreateCodeForFixedSizeAlloca(const TargetMachine& target,
852 unsigned int numElements,
853 vector<MachineInstr*>& getMvec)
855 assert(result && result->getParent() &&
856 "Result value is not part of a function?");
857 Function *F = result->getParent()->getParent();
858 MachineCodeForMethod &mcInfo = MachineCodeForMethod::get(F);
860 // Check if the offset would small enough to use as an immediate in
861 // load/stores (check LDX because all load/stores have the same-size immediate
862 // field). If not, put the variable in the dynamically sized area of the
864 unsigned int paddedSizeIgnored;
865 int offsetFromFP = mcInfo.computeOffsetforLocalVar(target, result,
867 tsize * numElements);
868 if (! target.getInstrInfo().constantFitsInImmedField(LDX, offsetFromFP))
870 CreateCodeForVariableSizeAlloca(target, result, tsize,
871 ConstantSInt::get(Type::IntTy,numElements),
876 // else offset fits in immediate field so go ahead and allocate it.
877 offsetFromFP = mcInfo.allocateLocalVar(target, result, tsize * numElements);
879 // Create a temporary Value to hold the constant offset.
880 // This is needed because it may not fit in the immediate field.
881 ConstantSInt* offsetVal = ConstantSInt::get(Type::IntTy, offsetFromFP);
883 // Instruction 1: add %fp, offsetFromFP -> result
884 MachineInstr* M = new MachineInstr(ADD);
885 M->SetMachineOperandReg(0, target.getRegInfo().getFramePointer());
886 M->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister, offsetVal);
887 M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister, result);
889 getMvec.push_back(M);
894 //------------------------------------------------------------------------
895 // Function SetOperandsForMemInstr
897 // Choose addressing mode for the given load or store instruction.
898 // Use [reg+reg] if it is an indexed reference, and the index offset is
899 // not a constant or if it cannot fit in the offset field.
900 // Use [reg+offset] in all other cases.
902 // This assumes that all array refs are "lowered" to one of these forms:
903 // %x = load (subarray*) ptr, constant ; single constant offset
904 // %x = load (subarray*) ptr, offsetVal ; single non-constant offset
905 // Generally, this should happen via strength reduction + LICM.
906 // Also, strength reduction should take care of using the same register for
907 // the loop index variable and an array index, when that is profitable.
908 //------------------------------------------------------------------------
911 SetOperandsForMemInstr(vector<MachineInstr*>& mvec,
912 vector<MachineInstr*>::iterator mvecI,
913 const InstructionNode* vmInstrNode,
914 const TargetMachine& target)
916 MemAccessInst* memInst = (MemAccessInst*) vmInstrNode->getInstruction();
918 // Variables to hold the index vector, ptr value, and offset value.
919 // The major work here is to extract these for all 3 instruction types
920 // and then call the common function SetMemOperands_Internal().
922 Value* ptrVal = memInst->getPointerOperand();
924 // Start with the index vector of this instruction, if any.
925 vector<Value*> idxVec;
926 idxVec.insert(idxVec.end(), memInst->idx_begin(), memInst->idx_end());
928 // If there is a GetElemPtr instruction to fold in to this instr,
929 // it must be in the left child for Load and GetElemPtr, and in the
930 // right child for Store instructions.
931 InstrTreeNode* ptrChild = (vmInstrNode->getOpLabel() == Instruction::Store
932 ? vmInstrNode->rightChild()
933 : vmInstrNode->leftChild());
935 // Fold chains of GetElemPtr instructions for structure references.
936 if (isa<StructType>(cast<PointerType>(ptrVal->getType())->getElementType())
937 && (ptrChild->getOpLabel() == Instruction::GetElementPtr ||
938 ptrChild->getOpLabel() == GetElemPtrIdx))
940 Value* newPtr = FoldGetElemChain((InstructionNode*) ptrChild, idxVec);
945 SetMemOperands_Internal(mvec, mvecI, vmInstrNode, ptrVal, idxVec, target);
949 // Generate the correct operands (and additional instructions if needed)
950 // for the given pointer and given index vector.
953 SetMemOperands_Internal(vector<MachineInstr*>& mvec,
954 vector<MachineInstr*>::iterator mvecI,
955 const InstructionNode* vmInstrNode,
957 vector<Value*>& idxVec,
958 const TargetMachine& target)
960 MemAccessInst* memInst = (MemAccessInst*) vmInstrNode->getInstruction();
962 // Initialize so we default to storing the offset in a register.
963 int64_t smallConstOffset = 0;
964 Value* valueForRegOffset = NULL;
965 MachineOperand::MachineOperandType offsetOpType =MachineOperand::MO_VirtualRegister;
967 // Check if there is an index vector and if so, compute the
968 // right offset for structures and for arrays
970 if (idxVec.size() > 0)
974 const PointerType* ptrType = cast<PointerType>(ptrVal->getType());
976 // Handle special common case of leading [0] index.
977 bool firstIndexIsZero =
978 bool(isa<ConstantUInt>(idxVec.front()) &&
979 cast<ConstantUInt>(idxVec.front())->getValue() == 0);
981 // This is a real structure reference if the ptr target is a
982 // structure type, and the first offset is [0] (eliminate that offset).
983 if (firstIndexIsZero && ptrType->getElementType()->isStructType())
985 // Compute the offset value using the index vector. Create a
986 // virtual reg. for it since it may not fit in the immed field.
987 assert(idxVec.size() >= 2);
988 idxVec.erase(idxVec.begin());
989 unsigned offset = target.DataLayout.getIndexedOffset(ptrType,idxVec);
990 valueForRegOffset = ConstantSInt::get(Type::IntTy, offset);
994 // It is an array ref, and must have been lowered to a single offset.
995 assert((memInst->getNumOperands()
996 == (unsigned) 1 + memInst->getFirstIndexOperandNumber())
997 && "Array refs must be lowered before Instruction Selection");
999 Value* arrayOffsetVal = * memInst->idx_begin();
1001 // If index is 0, the offset value is just 0. Otherwise,
1002 // generate a MUL instruction to compute address from index.
1003 // The call to getTypeSize() will fail if size is not constant.
1004 // CreateMulInstruction() folds constants intelligently enough.
1006 if (firstIndexIsZero)
1008 offsetOpType = MachineOperand::MO_SignExtendedImmed;
1009 smallConstOffset = 0;
1013 vector<MachineInstr*> mulVec;
1014 Instruction* addr = new TmpInstruction(Type::UIntTy, memInst);
1015 MachineCodeForInstruction::get(memInst).addTemp(addr);
1017 unsigned int eltSize =
1018 target.DataLayout.getTypeSize(ptrType->getElementType());
1019 assert(eltSize > 0 && "Invalid or non-const array element size");
1020 ConstantUInt* eltVal = ConstantUInt::get(Type::UIntTy, eltSize);
1022 CreateMulInstruction(target,
1023 arrayOffsetVal, /* lval, not likely const */
1024 eltVal, /* rval, likely constant */
1026 mulVec, INVALID_MACHINE_OPCODE);
1027 assert(mulVec.size() > 0 && "No multiply instruction created?");
1028 for (vector<MachineInstr*>::const_iterator I = mulVec.begin();
1029 I != mulVec.end(); ++I)
1031 mvecI = mvec.insert(mvecI, *I); // ptr to inserted value
1032 ++mvecI; // ptr to mem. instr.
1035 valueForRegOffset = addr;
1041 offsetOpType = MachineOperand::MO_SignExtendedImmed;
1042 smallConstOffset = 0;
1046 // Operand 0 is value, operand 1 is ptr, operand 2 is offset
1047 // For LOAD or GET_ELEMENT_PTR,
1048 // Operand 0 is ptr, operand 1 is offset, operand 2 is result.
1050 unsigned offsetOpNum, ptrOpNum;
1051 if (memInst->getOpcode() == Instruction::Store)
1053 (*mvecI)->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
1054 vmInstrNode->leftChild()->getValue());
1062 (*mvecI)->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,
1066 (*mvecI)->SetMachineOperandVal(ptrOpNum, MachineOperand::MO_VirtualRegister,
1069 if (offsetOpType == MachineOperand::MO_VirtualRegister)
1071 assert(valueForRegOffset != NULL);
1072 (*mvecI)->SetMachineOperandVal(offsetOpNum, offsetOpType,
1076 (*mvecI)->SetMachineOperandConst(offsetOpNum, offsetOpType,
1082 // Substitute operand `operandNum' of the instruction in node `treeNode'
1083 // in place of the use(s) of that instruction in node `parent'.
1084 // Check both explicit and implicit operands!
1085 // Also make sure to skip over a parent who:
1086 // (1) is a list node in the Burg tree, or
1087 // (2) itself had its results forwarded to its parent
1090 ForwardOperand(InstructionNode* treeNode,
1091 InstrTreeNode* parent,
1094 assert(treeNode && parent && "Invalid invocation of ForwardOperand");
1096 Instruction* unusedOp = treeNode->getInstruction();
1097 Value* fwdOp = unusedOp->getOperand(operandNum);
1099 // The parent itself may be a list node, so find the real parent instruction
1100 while (parent->getNodeType() != InstrTreeNode::NTInstructionNode)
1102 parent = parent->parent();
1103 assert(parent && "ERROR: Non-instruction node has no parent in tree.");
1105 InstructionNode* parentInstrNode = (InstructionNode*) parent;
1107 Instruction* userInstr = parentInstrNode->getInstruction();
1108 MachineCodeForInstruction &mvec = MachineCodeForInstruction::get(userInstr);
1110 // The parent's mvec would be empty if it was itself forwarded.
1111 // Recursively call ForwardOperand in that case...
1113 if (mvec.size() == 0)
1115 assert(parent->parent() != NULL &&
1116 "Parent could not have been forwarded, yet has no instructions?");
1117 ForwardOperand(treeNode, parent->parent(), operandNum);
1121 bool fwdSuccessful = false;
1122 for (unsigned i=0, N=mvec.size(); i < N; i++)
1124 MachineInstr* minstr = mvec[i];
1125 for (unsigned i=0, numOps=minstr->getNumOperands(); i < numOps; ++i)
1127 const MachineOperand& mop = minstr->getOperand(i);
1128 if (mop.getOperandType() == MachineOperand::MO_VirtualRegister &&
1129 mop.getVRegValue() == unusedOp)
1131 minstr->SetMachineOperandVal(i,
1132 MachineOperand::MO_VirtualRegister, fwdOp);
1133 fwdSuccessful = true;
1137 for (unsigned i=0,numOps=minstr->getNumImplicitRefs(); i<numOps; ++i)
1138 if (minstr->getImplicitRef(i) == unusedOp)
1140 minstr->setImplicitRef(i, fwdOp,
1141 minstr->implicitRefIsDefined(i));
1142 fwdSuccessful = true;
1145 assert(fwdSuccessful && "Value to be forwarded is never used!");
1150 void UltraSparcInstrInfo::
1151 CreateCopyInstructionsByType(const TargetMachine& target,
1155 vector<MachineInstr*>& minstrVec) const
1157 bool loadConstantToReg = false;
1159 const Type* resultType = dest->getType();
1161 MachineOpCode opCode = ChooseAddInstructionByType(resultType);
1162 if (opCode == INVALID_OPCODE)
1164 assert(0 && "Unsupported result type in CreateCopyInstructionsByType()");
1168 // if `src' is a constant that doesn't fit in the immed field or if it is
1169 // a global variable (i.e., a constant address), generate a load
1170 // instruction instead of an add
1172 if (isa<Constant>(src))
1174 unsigned int machineRegNum;
1176 MachineOperand::MachineOperandType opType =
1177 ChooseRegOrImmed(src, opCode, target, /*canUseImmed*/ true,
1178 machineRegNum, immedValue);
1180 if (opType == MachineOperand::MO_VirtualRegister)
1181 loadConstantToReg = true;
1183 else if (isa<GlobalValue>(src))
1184 loadConstantToReg = true;
1186 if (loadConstantToReg)
1187 { // `src' is constant and cannot fit in immed field for the ADD
1188 // Insert instructions to "load" the constant into a register
1189 vector<TmpInstruction*> tempVec;
1190 target.getInstrInfo().CreateCodeToLoadConst(F, src, dest,
1191 minstrVec, tempVec);
1192 for (unsigned i=0; i < tempVec.size(); i++)
1193 MachineCodeForInstruction::get(dest).addTemp(tempVec[i]);
1196 { // Create an add-with-0 instruction of the appropriate type.
1197 // Make `src' the second operand, in case it is a constant
1198 // Use (unsigned long) 0 for a NULL pointer value.
1200 const Type* zeroValueType =
1201 (resultType->getPrimitiveID() == Type::PointerTyID)? Type::ULongTy
1203 MachineInstr* minstr = new MachineInstr(opCode);
1204 minstr->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
1205 Constant::getNullConstant(zeroValueType));
1206 minstr->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister, src);
1207 minstr->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,dest);
1208 minstrVec.push_back(minstr);
1214 //******************* Externally Visible Functions *************************/
1217 //------------------------------------------------------------------------
1218 // External Function: GetInstructionsForProlog
1219 // External Function: GetInstructionsForEpilog
1222 // Create prolog and epilog code for procedure entry and exit
1223 //------------------------------------------------------------------------
1226 GetInstructionsForProlog(BasicBlock* entryBB,
1227 TargetMachine &target,
1228 MachineInstr** mvec)
1231 const MachineFrameInfo& frameInfo = target.getFrameInfo();
1234 // The second operand is the stack size. If it does not fit in the
1235 // immediate field, we have to use a free register to hold the size.
1236 // We will assume that local register `l0' is unused since the SAVE
1237 // instruction must be the first instruction in each procedure.
1239 Function *F = entryBB->getParent();
1240 MachineCodeForMethod& mcInfo = MachineCodeForMethod::get(F);
1241 unsigned int staticStackSize = mcInfo.getStaticStackSize();
1243 if (staticStackSize < (unsigned) frameInfo.getMinStackFrameSize())
1244 staticStackSize = (unsigned) frameInfo.getMinStackFrameSize();
1246 if (unsigned padsz = (staticStackSize %
1247 (unsigned) frameInfo.getStackFrameSizeAlignment()))
1248 staticStackSize += frameInfo.getStackFrameSizeAlignment() - padsz;
1250 if (target.getInstrInfo().constantFitsInImmedField(SAVE, staticStackSize))
1252 M = new MachineInstr(SAVE);
1253 M->SetMachineOperandReg(0, target.getRegInfo().getStackPointer());
1254 M->SetMachineOperandConst(1, MachineOperand::MO_SignExtendedImmed,
1255 - (int) staticStackSize);
1256 M->SetMachineOperandReg(2, target.getRegInfo().getStackPointer());
1261 M = new MachineInstr(SETSW);
1262 M->SetMachineOperandConst(0, MachineOperand::MO_SignExtendedImmed,
1263 - (int) staticStackSize);
1264 M->SetMachineOperandReg(1, MachineOperand::MO_MachineRegister,
1265 target.getRegInfo().getUnifiedRegNum(
1266 target.getRegInfo().getRegClassIDOfType(Type::IntTy),
1267 SparcIntRegOrder::l0));
1270 M = new MachineInstr(SAVE);
1271 M->SetMachineOperandReg(0, target.getRegInfo().getStackPointer());
1272 M->SetMachineOperandReg(1, MachineOperand::MO_MachineRegister,
1273 target.getRegInfo().getUnifiedRegNum(
1274 target.getRegInfo().getRegClassIDOfType(Type::IntTy),
1275 SparcIntRegOrder::l0));
1276 M->SetMachineOperandReg(2, target.getRegInfo().getStackPointer());
1285 GetInstructionsForEpilog(BasicBlock* anExitBB,
1286 TargetMachine &target,
1287 MachineInstr** mvec)
1289 mvec[0] = new MachineInstr(RESTORE);
1290 mvec[0]->SetMachineOperandReg(0, target.getRegInfo().getZeroRegNum());
1291 mvec[0]->SetMachineOperandConst(1, MachineOperand::MO_SignExtendedImmed,
1293 mvec[0]->SetMachineOperandReg(2, target.getRegInfo().getZeroRegNum());
1299 //------------------------------------------------------------------------
1300 // External Function: ThisIsAChainRule
1303 // Check if a given BURG rule is a chain rule.
1304 //------------------------------------------------------------------------
1307 ThisIsAChainRule(int eruleno)
1311 case 111: // stmt: reg
1312 case 113: // stmt: bool
1335 return false; break;
1340 //------------------------------------------------------------------------
1341 // External Function: GetInstructionsByRule
1344 // Choose machine instructions for the SPARC according to the
1345 // patterns chosen by the BURG-generated parser.
1346 //------------------------------------------------------------------------
1349 GetInstructionsByRule(InstructionNode* subtreeRoot,
1352 TargetMachine &target,
1353 vector<MachineInstr*>& mvec)
1355 bool checkCast = false; // initialize here to use fall-through
1357 int forwardOperandNum = -1;
1358 unsigned int allocaSize = 0;
1359 MachineInstr* M, *M2;
1364 // If the code for this instruction was folded into the parent (user),
1366 if (subtreeRoot->isFoldedIntoParent())
1370 // Let's check for chain rules outside the switch so that we don't have
1371 // to duplicate the list of chain rule production numbers here again
1373 if (ThisIsAChainRule(ruleForNode))
1375 // Chain rules have a single nonterminal on the RHS.
1376 // Get the rule that matches the RHS non-terminal and use that instead.
1378 assert(nts[0] && ! nts[1]
1379 && "A chain rule should have only one RHS non-terminal!");
1380 nextRule = burm_rule(subtreeRoot->state, nts[0]);
1381 nts = burm_nts[nextRule];
1382 GetInstructionsByRule(subtreeRoot, nextRule, nts, target, mvec);
1386 switch(ruleForNode) {
1387 case 1: // stmt: Ret
1388 case 2: // stmt: RetValue(reg)
1389 { // NOTE: Prepass of register allocation is responsible
1390 // for moving return value to appropriate register.
1391 // Mark the return-address register as a hidden virtual reg.
1392 // Mark the return value register as an implicit ref of
1393 // the machine instruction.
1394 // Finally put a NOP in the delay slot.
1395 ReturnInst *returnInstr =
1396 cast<ReturnInst>(subtreeRoot->getInstruction());
1397 assert(returnInstr->getOpcode() == Instruction::Ret);
1399 Instruction* returnReg = new TmpInstruction(returnInstr);
1400 MachineCodeForInstruction::get(returnInstr).addTemp(returnReg);
1402 M = new MachineInstr(JMPLRET);
1403 M->SetMachineOperandReg(0, MachineOperand::MO_VirtualRegister,
1405 M->SetMachineOperandConst(1,MachineOperand::MO_SignExtendedImmed,
1407 M->SetMachineOperandReg(2, target.getRegInfo().getZeroRegNum());
1409 if (returnInstr->getReturnValue() != NULL)
1410 M->addImplicitRef(returnInstr->getReturnValue());
1413 mvec.push_back(new MachineInstr(NOP));
1418 case 3: // stmt: Store(reg,reg)
1419 case 4: // stmt: Store(reg,ptrreg)
1420 mvec.push_back(new MachineInstr(
1421 ChooseStoreInstruction(
1422 subtreeRoot->leftChild()->getValue()->getType())));
1423 SetOperandsForMemInstr(mvec, mvec.end()-1, subtreeRoot, target);
1426 case 5: // stmt: BrUncond
1427 M = new MachineInstr(BA);
1428 M->SetMachineOperandVal(0, MachineOperand::MO_CCRegister,
1430 M->SetMachineOperandVal(1, MachineOperand::MO_PCRelativeDisp,
1431 cast<BranchInst>(subtreeRoot->getInstruction())->getSuccessor(0));
1435 mvec.push_back(new MachineInstr(NOP));
1438 case 206: // stmt: BrCond(setCCconst)
1439 { // setCCconst => boolean was computed with `%b = setCC type reg1 const'
1440 // If the constant is ZERO, we can use the branch-on-integer-register
1441 // instructions and avoid the SUBcc instruction entirely.
1442 // Otherwise this is just the same as case 5, so just fall through.
1444 InstrTreeNode* constNode = subtreeRoot->leftChild()->rightChild();
1446 constNode->getNodeType() ==InstrTreeNode::NTConstNode);
1447 Constant *constVal = cast<Constant>(constNode->getValue());
1450 if ((constVal->getType()->isIntegral()
1451 || constVal->getType()->isPointerType())
1452 && GetConstantValueAsSignedInt(constVal, isValidConst) == 0
1455 // That constant is a zero after all...
1456 // Use the left child of setCC as the first argument!
1457 // Mark the setCC node so that no code is generated for it.
1458 InstructionNode* setCCNode = (InstructionNode*)
1459 subtreeRoot->leftChild();
1460 assert(setCCNode->getOpLabel() == SetCCOp);
1461 setCCNode->markFoldedIntoParent();
1463 BranchInst* brInst=cast<BranchInst>(subtreeRoot->getInstruction());
1465 M = new MachineInstr(ChooseBprInstruction(subtreeRoot));
1466 M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
1467 setCCNode->leftChild()->getValue());
1468 M->SetMachineOperandVal(1, MachineOperand::MO_PCRelativeDisp,
1469 brInst->getSuccessor(0));
1473 mvec.push_back(new MachineInstr(NOP));
1476 M = new MachineInstr(BA);
1477 M->SetMachineOperandVal(0, MachineOperand::MO_CCRegister,
1479 M->SetMachineOperandVal(1, MachineOperand::MO_PCRelativeDisp,
1480 brInst->getSuccessor(1));
1484 mvec.push_back(new MachineInstr(NOP));
1488 // ELSE FALL THROUGH
1491 case 6: // stmt: BrCond(bool)
1492 { // bool => boolean was computed with some boolean operator
1493 // (SetCC, Not, ...). We need to check whether the type was a FP,
1494 // signed int or unsigned int, and check the branching condition in
1495 // order to choose the branch to use.
1496 // If it is an integer CC, we also need to find the unique
1497 // TmpInstruction representing that CC.
1499 BranchInst* brInst = cast<BranchInst>(subtreeRoot->getInstruction());
1501 M = new MachineInstr(ChooseBccInstruction(subtreeRoot, isFPBranch));
1503 Value* ccValue = GetTmpForCC(subtreeRoot->leftChild()->getValue(),
1504 brInst->getParent()->getParent(),
1505 isFPBranch? Type::FloatTy : Type::IntTy);
1507 M->SetMachineOperandVal(0, MachineOperand::MO_CCRegister, ccValue);
1508 M->SetMachineOperandVal(1, MachineOperand::MO_PCRelativeDisp,
1509 brInst->getSuccessor(0));
1513 mvec.push_back(new MachineInstr(NOP));
1516 M = new MachineInstr(BA);
1517 M->SetMachineOperandVal(0, MachineOperand::MO_CCRegister,
1519 M->SetMachineOperandVal(1, MachineOperand::MO_PCRelativeDisp,
1520 brInst->getSuccessor(1));
1524 mvec.push_back(new MachineInstr(NOP));
1528 case 208: // stmt: BrCond(boolconst)
1530 // boolconst => boolean is a constant; use BA to first or second label
1531 Constant* constVal =
1532 cast<Constant>(subtreeRoot->leftChild()->getValue());
1533 unsigned dest = cast<ConstantBool>(constVal)->getValue()? 0 : 1;
1535 M = new MachineInstr(BA);
1536 M->SetMachineOperandVal(0, MachineOperand::MO_CCRegister,
1538 M->SetMachineOperandVal(1, MachineOperand::MO_PCRelativeDisp,
1539 ((BranchInst*) subtreeRoot->getInstruction())->getSuccessor(dest));
1543 mvec.push_back(new MachineInstr(NOP));
1547 case 8: // stmt: BrCond(boolreg)
1548 { // boolreg => boolean is stored in an existing register.
1549 // Just use the branch-on-integer-register instruction!
1551 M = new MachineInstr(BRNZ);
1552 M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
1553 subtreeRoot->leftChild()->getValue());
1554 M->SetMachineOperandVal(1, MachineOperand::MO_PCRelativeDisp,
1555 ((BranchInst*) subtreeRoot->getInstruction())->getSuccessor(0));
1559 mvec.push_back(new MachineInstr(NOP));
1562 M = new MachineInstr(BA);
1563 M->SetMachineOperandVal(0, MachineOperand::MO_CCRegister,
1565 M->SetMachineOperandVal(1, MachineOperand::MO_PCRelativeDisp,
1566 ((BranchInst*) subtreeRoot->getInstruction())->getSuccessor(1));
1570 mvec.push_back(new MachineInstr(NOP));
1574 case 9: // stmt: Switch(reg)
1575 assert(0 && "*** SWITCH instruction is not implemented yet.");
1578 case 10: // reg: VRegList(reg, reg)
1579 assert(0 && "VRegList should never be the topmost non-chain rule");
1582 case 21: // bool: Not(bool): Both these are implemented as:
1583 case 421: // reg: BNot(reg) : reg = reg XOR-NOT 0
1584 M = new MachineInstr(XNOR);
1585 M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
1586 subtreeRoot->leftChild()->getValue());
1587 M->SetMachineOperandReg(1, target.getRegInfo().getZeroRegNum());
1588 M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,
1589 subtreeRoot->getValue());
1593 case 322: // reg: ToBoolTy(bool):
1594 case 22: // reg: ToBoolTy(reg):
1596 const Type* opType = subtreeRoot->leftChild()->getValue()->getType();
1597 assert(opType->isIntegral() || opType->isPointerType()
1598 || opType == Type::BoolTy);
1599 forwardOperandNum = 0; // forward first operand to user
1603 case 23: // reg: ToUByteTy(reg)
1604 case 25: // reg: ToUShortTy(reg)
1605 case 27: // reg: ToUIntTy(reg)
1606 case 29: // reg: ToULongTy(reg)
1608 const Type* opType = subtreeRoot->leftChild()->getValue()->getType();
1609 assert(opType->isIntegral() ||
1610 opType->isPointerType() ||
1611 opType == Type::BoolTy && "Cast is illegal for other types");
1612 forwardOperandNum = 0; // forward first operand to user
1616 case 24: // reg: ToSByteTy(reg)
1617 case 26: // reg: ToShortTy(reg)
1618 case 28: // reg: ToIntTy(reg)
1619 case 30: // reg: ToLongTy(reg)
1621 const Type* opType = subtreeRoot->leftChild()->getValue()->getType();
1622 if (opType->isIntegral()
1623 || opType->isPointerType()
1624 || opType == Type::BoolTy)
1626 forwardOperandNum = 0; // forward first operand to user
1630 // If the source operand is an FP type, the int result must be
1631 // copied from float to int register via memory!
1632 Instruction *dest = subtreeRoot->getInstruction();
1633 Value* leftVal = subtreeRoot->leftChild()->getValue();
1635 vector<MachineInstr*> minstrVec;
1637 if (opType == Type::FloatTy || opType == Type::DoubleTy)
1639 // Create a temporary to represent the INT register
1640 // into which the FP value will be copied via memory.
1641 // The type of this temporary will determine the FP
1642 // register used: single-prec for a 32-bit int or smaller,
1643 // double-prec for a 64-bit int.
1645 const Type* destTypeToUse =
1646 (dest->getType() == Type::LongTy)? Type::DoubleTy
1648 destForCast = new TmpInstruction(destTypeToUse, leftVal);
1649 MachineCodeForInstruction &MCFI =
1650 MachineCodeForInstruction::get(dest);
1651 MCFI.addTemp(destForCast);
1653 vector<TmpInstruction*> tempVec;
1654 target.getInstrInfo().CreateCodeToCopyFloatToInt(
1655 dest->getParent()->getParent(),
1656 (TmpInstruction*) destForCast, dest,
1657 minstrVec, tempVec, target);
1659 for (unsigned i=0; i < tempVec.size(); ++i)
1660 MCFI.addTemp(tempVec[i]);
1663 destForCast = leftVal;
1665 MachineOpCode opCode=ChooseConvertToIntInstr(subtreeRoot, opType);
1666 assert(opCode != INVALID_OPCODE && "Expected to need conversion!");
1668 M = new MachineInstr(opCode);
1669 M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
1671 M->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister,
1675 // Append the copy code, if any, after the conversion instr.
1676 mvec.insert(mvec.end(), minstrVec.begin(), minstrVec.end());
1681 case 31: // reg: ToFloatTy(reg):
1682 case 32: // reg: ToDoubleTy(reg):
1683 case 232: // reg: ToDoubleTy(Constant):
1685 // If this instruction has a parent (a user) in the tree
1686 // and the user is translated as an FsMULd instruction,
1687 // then the cast is unnecessary. So check that first.
1688 // In the future, we'll want to do the same for the FdMULq instruction,
1689 // so do the check here instead of only for ToFloatTy(reg).
1691 if (subtreeRoot->parent() != NULL &&
1692 MachineCodeForInstruction::get(((InstructionNode*)subtreeRoot->parent())->getInstruction())[0]->getOpCode() == FSMULD)
1694 forwardOperandNum = 0; // forward first operand to user
1698 Value* leftVal = subtreeRoot->leftChild()->getValue();
1699 const Type* opType = leftVal->getType();
1700 MachineOpCode opCode=ChooseConvertToFloatInstr(subtreeRoot,opType);
1701 if (opCode == INVALID_OPCODE) // no conversion needed
1703 forwardOperandNum = 0; // forward first operand to user
1707 // If the source operand is a non-FP type it must be
1708 // first copied from int to float register via memory!
1709 Instruction *dest = subtreeRoot->getInstruction();
1712 if (opType != Type::FloatTy && opType != Type::DoubleTy)
1714 // Create a temporary to represent the FP register
1715 // into which the integer will be copied via memory.
1716 // The type of this temporary will determine the FP
1717 // register used: single-prec for a 32-bit int or smaller,
1718 // double-prec for a 64-bit int.
1720 const Type* srcTypeToUse =
1721 (leftVal->getType() == Type::LongTy)? Type::DoubleTy
1724 srcForCast = new TmpInstruction(srcTypeToUse, dest);
1725 MachineCodeForInstruction &DestMCFI =
1726 MachineCodeForInstruction::get(dest);
1727 DestMCFI.addTemp(srcForCast);
1729 vector<MachineInstr*> minstrVec;
1730 vector<TmpInstruction*> tempVec;
1731 target.getInstrInfo().CreateCodeToCopyIntToFloat(
1732 dest->getParent()->getParent(),
1733 leftVal, (TmpInstruction*) srcForCast,
1734 minstrVec, tempVec, target);
1736 mvec.insert(mvec.end(), minstrVec.begin(),minstrVec.end());
1738 for (unsigned i=0; i < tempVec.size(); ++i)
1739 DestMCFI.addTemp(tempVec[i]);
1742 srcForCast = leftVal;
1744 M = new MachineInstr(opCode);
1745 M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
1747 M->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister,
1754 case 19: // reg: ToArrayTy(reg):
1755 case 20: // reg: ToPointerTy(reg):
1756 forwardOperandNum = 0; // forward first operand to user
1759 case 233: // reg: Add(reg, Constant)
1760 M = CreateAddConstInstruction(subtreeRoot);
1766 // ELSE FALL THROUGH
1768 case 33: // reg: Add(reg, reg)
1769 mvec.push_back(new MachineInstr(ChooseAddInstruction(subtreeRoot)));
1770 Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
1773 case 234: // reg: Sub(reg, Constant)
1774 M = CreateSubConstInstruction(subtreeRoot);
1780 // ELSE FALL THROUGH
1782 case 34: // reg: Sub(reg, reg)
1783 mvec.push_back(new MachineInstr(ChooseSubInstructionByType(
1784 subtreeRoot->getInstruction()->getType())));
1785 Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
1788 case 135: // reg: Mul(todouble, todouble)
1792 case 35: // reg: Mul(reg, reg)
1794 MachineOpCode forceOp = ((checkCast && BothFloatToDouble(subtreeRoot))
1796 : INVALID_MACHINE_OPCODE);
1797 CreateMulInstruction(target,
1798 subtreeRoot->leftChild()->getValue(),
1799 subtreeRoot->rightChild()->getValue(),
1800 subtreeRoot->getInstruction(),
1804 case 335: // reg: Mul(todouble, todoubleConst)
1808 case 235: // reg: Mul(reg, Constant)
1810 MachineOpCode forceOp = ((checkCast && BothFloatToDouble(subtreeRoot))
1812 : INVALID_MACHINE_OPCODE);
1813 CreateMulInstruction(target,
1814 subtreeRoot->leftChild()->getValue(),
1815 subtreeRoot->rightChild()->getValue(),
1816 subtreeRoot->getInstruction(),
1820 case 236: // reg: Div(reg, Constant)
1822 CreateDivConstInstruction(target, subtreeRoot, mvec);
1823 if (mvec.size() > L)
1825 // ELSE FALL THROUGH
1827 case 36: // reg: Div(reg, reg)
1828 mvec.push_back(new MachineInstr(ChooseDivInstruction(target, subtreeRoot)));
1829 Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
1832 case 37: // reg: Rem(reg, reg)
1833 case 237: // reg: Rem(reg, Constant)
1835 Instruction* remInstr = subtreeRoot->getInstruction();
1837 TmpInstruction* quot = new TmpInstruction(
1838 subtreeRoot->leftChild()->getValue(),
1839 subtreeRoot->rightChild()->getValue());
1840 TmpInstruction* prod = new TmpInstruction(
1842 subtreeRoot->rightChild()->getValue());
1843 MachineCodeForInstruction::get(remInstr).addTemp(quot).addTemp(prod);
1845 M = new MachineInstr(ChooseDivInstruction(target, subtreeRoot));
1846 Set3OperandsFromInstr(M, subtreeRoot, target);
1847 M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,quot);
1850 M = new MachineInstr(ChooseMulInstructionByType(
1851 subtreeRoot->getInstruction()->getType()));
1852 M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,quot);
1853 M->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister,
1854 subtreeRoot->rightChild()->getValue());
1855 M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,prod);
1858 M = new MachineInstr(ChooseSubInstructionByType(
1859 subtreeRoot->getInstruction()->getType()));
1860 Set3OperandsFromInstr(M, subtreeRoot, target);
1861 M->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister,prod);
1867 case 38: // bool: And(bool, bool)
1868 case 238: // bool: And(bool, boolconst)
1869 case 338: // reg : BAnd(reg, reg)
1870 case 538: // reg : BAnd(reg, Constant)
1871 mvec.push_back(new MachineInstr(AND));
1872 Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
1875 case 138: // bool: And(bool, not)
1876 case 438: // bool: BAnd(bool, not)
1877 mvec.push_back(new MachineInstr(ANDN));
1878 Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
1881 case 39: // bool: Or(bool, bool)
1882 case 239: // bool: Or(bool, boolconst)
1883 case 339: // reg : BOr(reg, reg)
1884 case 539: // reg : BOr(reg, Constant)
1885 mvec.push_back(new MachineInstr(ORN));
1886 Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
1889 case 139: // bool: Or(bool, not)
1890 case 439: // bool: BOr(bool, not)
1891 mvec.push_back(new MachineInstr(ORN));
1892 Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
1895 case 40: // bool: Xor(bool, bool)
1896 case 240: // bool: Xor(bool, boolconst)
1897 case 340: // reg : BXor(reg, reg)
1898 case 540: // reg : BXor(reg, Constant)
1899 mvec.push_back(new MachineInstr(XOR));
1900 Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
1903 case 140: // bool: Xor(bool, not)
1904 case 440: // bool: BXor(bool, not)
1905 mvec.push_back(new MachineInstr(XNOR));
1906 Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
1909 case 41: // boolconst: SetCC(reg, Constant)
1911 // If the SetCC was folded into the user (parent), it will be
1912 // caught above. All other cases are the same as case 42,
1913 // so just fall through.
1915 case 42: // bool: SetCC(reg, reg):
1917 // This generates a SUBCC instruction, putting the difference in
1918 // a result register, and setting a condition code.
1920 // If the boolean result of the SetCC is used by anything other
1921 // than a single branch instruction, the boolean must be
1922 // computed and stored in the result register. Otherwise, discard
1923 // the difference (by using %g0) and keep only the condition code.
1925 // To compute the boolean result in a register we use a conditional
1926 // move, unless the result of the SUBCC instruction can be used as
1927 // the bool! This assumes that zero is FALSE and any non-zero
1930 InstructionNode* parentNode = (InstructionNode*) subtreeRoot->parent();
1931 Instruction* setCCInstr = subtreeRoot->getInstruction();
1932 bool keepBoolVal = (parentNode == NULL ||
1933 parentNode->getInstruction()->getOpcode()
1934 != Instruction::Br);
1935 bool subValIsBoolVal = setCCInstr->getOpcode() == Instruction::SetNE;
1936 bool keepSubVal = keepBoolVal && subValIsBoolVal;
1937 bool computeBoolVal = keepBoolVal && ! subValIsBoolVal;
1941 MachineOpCode movOpCode = 0;
1943 // Mark the 4th operand as being a CC register, and as a def
1944 // A TmpInstruction is created to represent the CC "result".
1945 // Unlike other instances of TmpInstruction, this one is used
1946 // by machine code of multiple LLVM instructions, viz.,
1947 // the SetCC and the branch. Make sure to get the same one!
1948 // Note that we do this even for FP CC registers even though they
1949 // are explicit operands, because the type of the operand
1950 // needs to be a floating point condition code, not an integer
1951 // condition code. Think of this as casting the bool result to
1952 // a FP condition code register.
1954 Value* leftVal = subtreeRoot->leftChild()->getValue();
1955 bool isFPCompare = (leftVal->getType() == Type::FloatTy ||
1956 leftVal->getType() == Type::DoubleTy);
1958 TmpInstruction* tmpForCC = GetTmpForCC(setCCInstr,
1959 setCCInstr->getParent()->getParent(),
1960 isFPCompare? Type::FloatTy : Type::IntTy);
1961 MachineCodeForInstruction::get(setCCInstr).addTemp(tmpForCC);
1965 // Integer condition: dest. should be %g0 or an integer register.
1966 // If result must be saved but condition is not SetEQ then we need
1967 // a separate instruction to compute the bool result, so discard
1968 // result of SUBcc instruction anyway.
1970 M = new MachineInstr(SUBcc);
1971 Set3OperandsFromInstr(M, subtreeRoot, target, ! keepSubVal);
1972 M->SetMachineOperandVal(3, MachineOperand::MO_CCRegister,
1973 tmpForCC, /*def*/true);
1977 { // recompute bool using the integer condition codes
1979 ChooseMovpccAfterSub(subtreeRoot,mustClearReg,valueToMove);
1984 // FP condition: dest of FCMP should be some FCCn register
1985 M = new MachineInstr(ChooseFcmpInstruction(subtreeRoot));
1986 M->SetMachineOperandVal(0, MachineOperand::MO_CCRegister,
1988 M->SetMachineOperandVal(1,MachineOperand::MO_VirtualRegister,
1989 subtreeRoot->leftChild()->getValue());
1990 M->SetMachineOperandVal(2,MachineOperand::MO_VirtualRegister,
1991 subtreeRoot->rightChild()->getValue());
1995 {// recompute bool using the FP condition codes
1996 mustClearReg = true;
1998 movOpCode = ChooseMovFpccInstruction(subtreeRoot);
2005 {// Unconditionally set register to 0
2006 M = new MachineInstr(SETHI);
2007 M->SetMachineOperandConst(0,MachineOperand::MO_UnextendedImmed,
2009 M->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister,
2014 // Now conditionally move `valueToMove' (0 or 1) into the register
2015 M = new MachineInstr(movOpCode);
2016 M->SetMachineOperandVal(0, MachineOperand::MO_CCRegister,
2018 M->SetMachineOperandConst(1, MachineOperand::MO_UnextendedImmed,
2020 M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,
2027 case 43: // boolreg: VReg
2028 case 44: // boolreg: Constant
2031 case 51: // reg: Load(reg)
2032 case 52: // reg: Load(ptrreg)
2033 case 53: // reg: LoadIdx(reg,reg)
2034 case 54: // reg: LoadIdx(ptrreg,reg)
2035 mvec.push_back(new MachineInstr(ChooseLoadInstruction(
2036 subtreeRoot->getValue()->getType())));
2037 SetOperandsForMemInstr(mvec, mvec.end()-1, subtreeRoot, target);
2040 case 55: // reg: GetElemPtr(reg)
2041 case 56: // reg: GetElemPtrIdx(reg,reg)
2042 // If the GetElemPtr was folded into the user (parent), it will be
2043 // caught above. For other cases, we have to compute the address.
2044 mvec.push_back(new MachineInstr(ADD));
2045 SetOperandsForMemInstr(mvec, mvec.end()-1, subtreeRoot, target);
2048 case 57: // reg: Alloca: Implement as 1 instruction:
2049 { // add %fp, offsetFromFP -> result
2050 AllocationInst* instr =
2051 cast<AllocationInst>(subtreeRoot->getInstruction());
2052 unsigned int tsize =
2053 target.findOptimalStorageSize(instr->getAllocatedType());
2055 CreateCodeForFixedSizeAlloca(target, instr, tsize, 1, mvec);
2059 case 58: // reg: Alloca(reg): Implement as 3 instructions:
2060 // mul num, typeSz -> tmp
2061 // sub %sp, tmp -> %sp
2062 { // add %sp, frameSizeBelowDynamicArea -> result
2063 AllocationInst* instr =
2064 cast<AllocationInst>(subtreeRoot->getInstruction());
2065 const Type* eltType = instr->getAllocatedType();
2067 // If #elements is constant, use simpler code for fixed-size allocas
2068 int tsize = (int) target.findOptimalStorageSize(eltType);
2069 Value* numElementsVal = NULL;
2070 bool isArray = instr->isArrayAllocation();
2073 isa<Constant>(numElementsVal = instr->getArraySize()))
2074 { // total size is constant: generate code for fixed-size alloca
2075 unsigned int numElements = isArray?
2076 cast<ConstantUInt>(numElementsVal)->getValue() : 1;
2077 CreateCodeForFixedSizeAlloca(target, instr, tsize,
2080 else // total size is not constant.
2081 CreateCodeForVariableSizeAlloca(target, instr, tsize,
2082 numElementsVal, mvec);
2086 case 61: // reg: Call
2087 { // Generate a call-indirect (i.e., jmpl) for now to expose
2088 // the potential need for registers. If an absolute address
2089 // is available, replace this with a CALL instruction.
2090 // Mark both the indirection register and the return-address
2091 // register as hidden virtual registers.
2092 // Also, mark the operands of the Call and return value (if
2093 // any) as implicit operands of the CALL machine instruction.
2095 CallInst *callInstr = cast<CallInst>(subtreeRoot->getInstruction());
2096 Value *callee = callInstr->getCalledValue();
2098 // Create hidden virtual register for return address, with type void*.
2099 Instruction* retAddrReg =
2100 new TmpInstruction(PointerType::get(Type::VoidTy), callInstr);
2101 MachineCodeForInstruction::get(callInstr).addTemp(retAddrReg);
2103 // Generate the machine instruction and its operands.
2104 // Use CALL for direct function calls; this optimistically assumes
2105 // the PC-relative address fits in the CALL address field (22 bits).
2106 // Use JMPL for indirect calls.
2108 if (isa<Function>(callee))
2109 { // direct function call
2110 M = new MachineInstr(CALL);
2111 M->SetMachineOperandVal(0, MachineOperand::MO_PCRelativeDisp,
2115 { // indirect function call
2116 M = new MachineInstr(JMPLCALL);
2117 M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
2119 M->SetMachineOperandConst(1, MachineOperand::MO_SignExtendedImmed,
2121 M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,
2127 // WARNING: Operands 0..N-1 must go in slots 0..N-1 of implicitUses.
2128 // The result value must go in slot N. This is assumed
2129 // in register allocation.
2131 // Add the call operands and return value as implicit refs
2132 for (unsigned i=0, N=callInstr->getNumOperands(); i < N; ++i)
2133 if (callInstr->getOperand(i) != callee)
2134 mvec.back()->addImplicitRef(callInstr->getOperand(i));
2136 if (callInstr->getType() != Type::VoidTy)
2137 mvec.back()->addImplicitRef(callInstr, /*isDef*/ true);
2139 // For the CALL instruction, the ret. addr. reg. is also implicit
2140 if (isa<Function>(callee))
2141 mvec.back()->addImplicitRef(retAddrReg, /*isDef*/ true);
2144 mvec.push_back(new MachineInstr(NOP));
2148 case 62: // reg: Shl(reg, reg)
2149 { const Type* opType = subtreeRoot->leftChild()->getValue()->getType();
2150 assert(opType->isIntegral()
2151 || opType == Type::BoolTy
2152 || opType->isPointerType()&& "Shl unsupported for other types");
2153 mvec.push_back(new MachineInstr((opType == Type::LongTy)? SLLX : SLL));
2154 Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
2158 case 63: // reg: Shr(reg, reg)
2159 { const Type* opType = subtreeRoot->leftChild()->getValue()->getType();
2160 assert(opType->isIntegral()
2161 || opType == Type::BoolTy
2162 || opType->isPointerType() &&"Shr unsupported for other types");
2163 mvec.push_back(new MachineInstr((opType->isSigned()
2164 ? ((opType == Type::LongTy)? SRAX : SRA)
2165 : ((opType == Type::LongTy)? SRLX : SRL))));
2166 Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
2170 case 64: // reg: Phi(reg,reg)
2171 break; // don't forward the value
2173 #undef NEED_PHI_MACHINE_INSTRS
2174 #ifdef NEED_PHI_MACHINE_INSTRS
2175 { // This instruction has variable #operands, so resultPos is 0.
2176 Instruction* phi = subtreeRoot->getInstruction();
2177 M = new MachineInstr(PHI, 1 + phi->getNumOperands());
2178 M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
2179 subtreeRoot->getValue());
2180 for (unsigned i=0, N=phi->getNumOperands(); i < N; i++)
2181 M->SetMachineOperandVal(i+1, MachineOperand::MO_VirtualRegister,
2182 phi->getOperand(i));
2186 #endif // NEED_PHI_MACHINE_INSTRS
2189 case 71: // reg: VReg
2190 case 72: // reg: Constant
2191 break; // don't forward the value
2194 assert(0 && "Unrecognized BURG rule");
2199 if (forwardOperandNum >= 0)
2200 { // We did not generate a machine instruction but need to use operand.
2201 // If user is in the same tree, replace Value in its machine operand.
2202 // If not, insert a copy instruction which should get coalesced away
2203 // by register allocation.
2204 if (subtreeRoot->parent() != NULL)
2205 ForwardOperand(subtreeRoot, subtreeRoot->parent(), forwardOperandNum);
2208 vector<MachineInstr*> minstrVec;
2209 target.getInstrInfo().CreateCopyInstructionsByType(target,
2210 subtreeRoot->getInstruction()->getParent()->getParent(),
2211 subtreeRoot->getInstruction()->getOperand(forwardOperandNum),
2212 subtreeRoot->getInstruction(), minstrVec);
2213 assert(minstrVec.size() > 0);
2214 mvec.insert(mvec.end(), minstrVec.begin(), minstrVec.end());