1 //===-- SparcV9InstrInfo.cpp ------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 //===----------------------------------------------------------------------===//
12 #include "llvm/Constants.h"
13 #include "llvm/DerivedTypes.h"
14 #include "llvm/Function.h"
15 #include "llvm/iTerminators.h"
16 #include "llvm/CodeGen/InstrSelection.h"
17 #include "llvm/CodeGen/InstrSelectionSupport.h"
18 #include "llvm/CodeGen/MachineConstantPool.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineFunctionInfo.h"
21 #include "llvm/CodeGen/MachineCodeForInstruction.h"
22 #include "llvm/CodeGen/MachineInstrBuilder.h"
23 #include "SparcV9Internals.h"
24 #include "SparcV9InstrSelectionSupport.h"
25 #include "SparcV9InstrInfo.h"
29 static const uint32_t MAXLO = (1 << 10) - 1; // set bits set by %lo(*)
30 static const uint32_t MAXSIMM = (1 << 12) - 1; // set bits in simm13 field of OR
32 //---------------------------------------------------------------------------
33 // Function ConvertConstantToIntType
35 // Function to get the value of an integral constant in the form
36 // that must be put into the machine register. The specified constant is
37 // interpreted as (i.e., converted if necessary to) the specified destination
38 // type. The result is always returned as an uint64_t, since the representation
39 // of int64_t and uint64_t are identical. The argument can be any known const.
41 // isValidConstant is set to true if a valid constant was found.
42 //---------------------------------------------------------------------------
45 SparcV9InstrInfo::ConvertConstantToIntType(const TargetMachine &target,
48 bool &isValidConstant) const
50 isValidConstant = false;
53 if (! destType->isIntegral() && ! isa<PointerType>(destType))
56 if (! isa<Constant>(V))
59 // ConstantPointerRef: no conversions needed: get value and return it
60 if (const ConstantPointerRef* CPR = dyn_cast<ConstantPointerRef>(V)) {
61 // A ConstantPointerRef is just a reference to GlobalValue.
62 isValidConstant = true; // may be overwritten by recursive call
63 return (CPR->isNullValue()? 0
64 : ConvertConstantToIntType(target, CPR->getValue(), destType,
68 // ConstantBool: no conversions needed: get value and return it
69 if (const ConstantBool *CB = dyn_cast<ConstantBool>(V)) {
70 isValidConstant = true;
71 return (uint64_t) CB->getValue();
74 // For other types of constants, some conversion may be needed.
75 // First, extract the constant operand according to its own type
76 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
77 switch(CE->getOpcode()) {
78 case Instruction::Cast: // recursively get the value as cast
79 C = ConvertConstantToIntType(target, CE->getOperand(0), CE->getType(),
82 default: // not simplifying other ConstantExprs
85 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
86 isValidConstant = true;
87 C = CI->getRawValue();
89 else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(V)) {
90 isValidConstant = true;
91 double fC = CFP->getValue();
92 C = (destType->isSigned()? (uint64_t) (int64_t) fC
96 // Now if a valid value was found, convert it to destType.
97 if (isValidConstant) {
98 unsigned opSize = target.getTargetData().getTypeSize(V->getType());
99 unsigned destSize = target.getTargetData().getTypeSize(destType);
100 uint64_t maskHi = (destSize < 8)? (1U << 8*destSize) - 1 : ~0;
101 assert(opSize <= 8 && destSize <= 8 && ">8-byte int type unexpected");
103 if (destType->isSigned()) {
104 if (opSize > destSize) // operand is larger than dest:
105 C = C & maskHi; // mask high bits
107 if (opSize > destSize ||
108 (opSize == destSize && ! V->getType()->isSigned()))
109 if (C & (1U << (8*destSize - 1)))
110 C = C | ~maskHi; // sign-extend from destSize to 64 bits
113 if (opSize > destSize || (V->getType()->isSigned() && destSize < 8)) {
114 // operand is larger than dest,
115 // OR both are equal but smaller than the full register size
116 // AND operand is signed, so it may have extra sign bits:
127 //----------------------------------------------------------------------------
128 // Function: CreateSETUWConst
130 // Set a 32-bit unsigned constant in the register `dest', using
131 // SETHI, OR in the worst case. This function correctly emulates
132 // the SETUW pseudo-op for SPARC v9 (if argument isSigned == false).
134 // The isSigned=true case is used to implement SETSW without duplicating code.
136 // Optimize some common cases:
137 // (1) Small value that fits in simm13 field of OR: don't need SETHI.
138 // (2) isSigned = true and C is a small negative signed value, i.e.,
139 // high bits are 1, and the remaining bits fit in simm13(OR).
140 //----------------------------------------------------------------------------
143 CreateSETUWConst(const TargetMachine& target, uint32_t C,
144 Instruction* dest, std::vector<MachineInstr*>& mvec,
145 bool isSigned = false)
147 MachineInstr *miSETHI = NULL, *miOR = NULL;
149 // In order to get efficient code, we should not generate the SETHI if
150 // all high bits are 1 (i.e., this is a small signed value that fits in
151 // the simm13 field of OR). So we check for and handle that case specially.
152 // NOTE: The value C = 0x80000000 is bad: sC < 0 *and* -sC < 0.
153 // In fact, sC == -sC, so we have to check for this explicitly.
154 int32_t sC = (int32_t) C;
155 bool smallNegValue =isSigned && sC < 0 && sC != -sC && -sC < (int32_t)MAXSIMM;
157 // Set the high 22 bits in dest if non-zero and simm13 field of OR not enough
158 if (!smallNegValue && (C & ~MAXLO) && C > MAXSIMM) {
159 miSETHI = BuildMI(V9::SETHI, 2).addZImm(C).addRegDef(dest);
160 miSETHI->setOperandHi32(0);
161 mvec.push_back(miSETHI);
164 // Set the low 10 or 12 bits in dest. This is necessary if no SETHI
165 // was generated, or if the low 10 bits are non-zero.
166 if (miSETHI==NULL || C & MAXLO) {
168 // unsigned value with high-order bits set using SETHI
169 miOR = BuildMI(V9::ORi,3).addReg(dest).addZImm(C).addRegDef(dest);
170 miOR->setOperandLo32(1);
172 // unsigned or small signed value that fits in simm13 field of OR
173 assert(smallNegValue || (C & ~MAXSIMM) == 0);
174 miOR = BuildMI(V9::ORi, 3).addMReg(target.getRegInfo()
176 .addSImm(sC).addRegDef(dest);
178 mvec.push_back(miOR);
181 assert((miSETHI || miOR) && "Oops, no code was generated!");
185 //----------------------------------------------------------------------------
186 // Function: CreateSETSWConst
188 // Set a 32-bit signed constant in the register `dest', with sign-extension
189 // to 64 bits. This uses SETHI, OR, SRA in the worst case.
190 // This function correctly emulates the SETSW pseudo-op for SPARC v9.
192 // Optimize the same cases as SETUWConst, plus:
193 // (1) SRA is not needed for positive or small negative values.
194 //----------------------------------------------------------------------------
197 CreateSETSWConst(const TargetMachine& target, int32_t C,
198 Instruction* dest, std::vector<MachineInstr*>& mvec)
200 // Set the low 32 bits of dest
201 CreateSETUWConst(target, (uint32_t) C, dest, mvec, /*isSigned*/true);
203 // Sign-extend to the high 32 bits if needed.
204 // NOTE: The value C = 0x80000000 is bad: -C == C and so -C is < MAXSIMM
205 if (C < 0 && (C == -C || -C > (int32_t) MAXSIMM))
206 mvec.push_back(BuildMI(V9::SRAi5,3).addReg(dest).addZImm(0).addRegDef(dest));
210 //----------------------------------------------------------------------------
211 // Function: CreateSETXConst
213 // Set a 64-bit signed or unsigned constant in the register `dest'.
214 // Use SETUWConst for each 32 bit word, plus a left-shift-by-32 in between.
215 // This function correctly emulates the SETX pseudo-op for SPARC v9.
217 // Optimize the same cases as SETUWConst for each 32 bit word.
218 //----------------------------------------------------------------------------
221 CreateSETXConst(const TargetMachine& target, uint64_t C,
222 Instruction* tmpReg, Instruction* dest,
223 std::vector<MachineInstr*>& mvec)
225 assert(C > (unsigned int) ~0 && "Use SETUW/SETSW for 32-bit values!");
229 // Code to set the upper 32 bits of the value in register `tmpReg'
230 CreateSETUWConst(target, (C >> 32), tmpReg, mvec);
232 // Shift tmpReg left by 32 bits
233 mvec.push_back(BuildMI(V9::SLLXi6, 3).addReg(tmpReg).addZImm(32)
236 // Code to set the low 32 bits of the value in register `dest'
237 CreateSETUWConst(target, C, dest, mvec);
239 // dest = OR(tmpReg, dest)
240 mvec.push_back(BuildMI(V9::ORr,3).addReg(dest).addReg(tmpReg).addRegDef(dest));
244 //----------------------------------------------------------------------------
245 // Function: CreateSETUWLabel
247 // Set a 32-bit constant (given by a symbolic label) in the register `dest'.
248 //----------------------------------------------------------------------------
251 CreateSETUWLabel(const TargetMachine& target, Value* val,
252 Instruction* dest, std::vector<MachineInstr*>& mvec)
256 // Set the high 22 bits in dest
257 MI = BuildMI(V9::SETHI, 2).addReg(val).addRegDef(dest);
258 MI->setOperandHi32(0);
261 // Set the low 10 bits in dest
262 MI = BuildMI(V9::ORr, 3).addReg(dest).addReg(val).addRegDef(dest);
263 MI->setOperandLo32(1);
268 //----------------------------------------------------------------------------
269 // Function: CreateSETXLabel
271 // Set a 64-bit constant (given by a symbolic label) in the register `dest'.
272 //----------------------------------------------------------------------------
275 CreateSETXLabel(const TargetMachine& target,
276 Value* val, Instruction* tmpReg, Instruction* dest,
277 std::vector<MachineInstr*>& mvec)
279 assert(isa<Constant>(val) || isa<GlobalValue>(val) &&
280 "I only know about constant values and global addresses");
284 MI = BuildMI(V9::SETHI, 2).addPCDisp(val).addRegDef(tmpReg);
285 MI->setOperandHi64(0);
288 MI = BuildMI(V9::ORi, 3).addReg(tmpReg).addPCDisp(val).addRegDef(tmpReg);
289 MI->setOperandLo64(1);
292 mvec.push_back(BuildMI(V9::SLLXi6, 3).addReg(tmpReg).addZImm(32)
294 MI = BuildMI(V9::SETHI, 2).addPCDisp(val).addRegDef(dest);
295 MI->setOperandHi32(0);
298 MI = BuildMI(V9::ORr, 3).addReg(dest).addReg(tmpReg).addRegDef(dest);
301 MI = BuildMI(V9::ORi, 3).addReg(dest).addPCDisp(val).addRegDef(dest);
302 MI->setOperandLo32(1);
307 //----------------------------------------------------------------------------
308 // Function: CreateUIntSetInstruction
310 // Create code to Set an unsigned constant in the register `dest'.
311 // Uses CreateSETUWConst, CreateSETSWConst or CreateSETXConst as needed.
312 // CreateSETSWConst is an optimization for the case that the unsigned value
313 // has all ones in the 33 high bits (so that sign-extension sets them all).
314 //----------------------------------------------------------------------------
317 CreateUIntSetInstruction(const TargetMachine& target,
318 uint64_t C, Instruction* dest,
319 std::vector<MachineInstr*>& mvec,
320 MachineCodeForInstruction& mcfi)
322 static const uint64_t lo32 = (uint32_t) ~0;
323 if (C <= lo32) // High 32 bits are 0. Set low 32 bits.
324 CreateSETUWConst(target, (uint32_t) C, dest, mvec);
325 else if ((C & ~lo32) == ~lo32 && (C & (1U << 31))) {
326 // All high 33 (not 32) bits are 1s: sign-extension will take care
327 // of high 32 bits, so use the sequence for signed int
328 CreateSETSWConst(target, (int32_t) C, dest, mvec);
329 } else if (C > lo32) {
330 // C does not fit in 32 bits
331 TmpInstruction* tmpReg = new TmpInstruction(mcfi, Type::IntTy);
332 CreateSETXConst(target, C, tmpReg, dest, mvec);
337 //----------------------------------------------------------------------------
338 // Function: CreateIntSetInstruction
340 // Create code to Set a signed constant in the register `dest'.
341 // Really the same as CreateUIntSetInstruction.
342 //----------------------------------------------------------------------------
345 CreateIntSetInstruction(const TargetMachine& target,
346 int64_t C, Instruction* dest,
347 std::vector<MachineInstr*>& mvec,
348 MachineCodeForInstruction& mcfi)
350 CreateUIntSetInstruction(target, (uint64_t) C, dest, mvec, mcfi);
354 //---------------------------------------------------------------------------
355 // Create a table of LLVM opcode -> max. immediate constant likely to
356 // be usable for that operation.
357 //---------------------------------------------------------------------------
359 // Entry == 0 ==> no immediate constant field exists at all.
360 // Entry > 0 ==> abs(immediate constant) <= Entry
362 std::vector<int> MaxConstantsTable(Instruction::OtherOpsEnd);
365 MaxConstantForInstr(unsigned llvmOpCode)
367 int modelOpCode = -1;
369 if (llvmOpCode >= Instruction::BinaryOpsBegin &&
370 llvmOpCode < Instruction::BinaryOpsEnd)
371 modelOpCode = V9::ADDi;
374 case Instruction::Ret: modelOpCode = V9::JMPLCALLi; break;
376 case Instruction::Malloc:
377 case Instruction::Alloca:
378 case Instruction::GetElementPtr:
379 case Instruction::PHI:
380 case Instruction::Cast:
381 case Instruction::Call: modelOpCode = V9::ADDi; break;
383 case Instruction::Shl:
384 case Instruction::Shr: modelOpCode = V9::SLLXi6; break;
389 return (modelOpCode < 0)? 0: SparcV9MachineInstrDesc[modelOpCode].maxImmedConst;
393 InitializeMaxConstantsTable()
396 assert(MaxConstantsTable.size() == Instruction::OtherOpsEnd &&
397 "assignments below will be illegal!");
398 for (op = Instruction::TermOpsBegin; op < Instruction::TermOpsEnd; ++op)
399 MaxConstantsTable[op] = MaxConstantForInstr(op);
400 for (op = Instruction::BinaryOpsBegin; op < Instruction::BinaryOpsEnd; ++op)
401 MaxConstantsTable[op] = MaxConstantForInstr(op);
402 for (op = Instruction::MemoryOpsBegin; op < Instruction::MemoryOpsEnd; ++op)
403 MaxConstantsTable[op] = MaxConstantForInstr(op);
404 for (op = Instruction::OtherOpsBegin; op < Instruction::OtherOpsEnd; ++op)
405 MaxConstantsTable[op] = MaxConstantForInstr(op);
409 //---------------------------------------------------------------------------
410 // class SparcV9InstrInfo
413 // Information about individual instructions.
414 // Most information is stored in the SparcV9MachineInstrDesc array above.
415 // Other information is computed on demand, and most such functions
416 // default to member functions in base class TargetInstrInfo.
417 //---------------------------------------------------------------------------
419 SparcV9InstrInfo::SparcV9InstrInfo()
420 : TargetInstrInfo(SparcV9MachineInstrDesc, V9::NUM_TOTAL_OPCODES) {
421 InitializeMaxConstantsTable();
425 SparcV9InstrInfo::ConstantMayNotFitInImmedField(const Constant* CV,
426 const Instruction* I) const
428 if (I->getOpcode() >= MaxConstantsTable.size()) // user-defined op (or bug!)
431 if (isa<ConstantPointerNull>(CV)) // can always use %g0
434 if (isa<SwitchInst>(I)) // Switch instructions will be lowered!
437 if (const ConstantInt* CI = dyn_cast<ConstantInt>(CV))
438 return labs((int64_t)CI->getRawValue()) > MaxConstantsTable[I->getOpcode()];
440 if (isa<ConstantBool>(CV))
441 return 1 > MaxConstantsTable[I->getOpcode()];
447 // Create an instruction sequence to put the constant `val' into
448 // the virtual register `dest'. `val' may be a Constant or a
449 // GlobalValue, viz., the constant address of a global variable or function.
450 // The generated instructions are returned in `mvec'.
451 // Any temp. registers (TmpInstruction) created are recorded in mcfi.
452 // Any stack space required is allocated via MachineFunction.
455 SparcV9InstrInfo::CreateCodeToLoadConst(const TargetMachine& target,
459 std::vector<MachineInstr*>& mvec,
460 MachineCodeForInstruction& mcfi) const
462 assert(isa<Constant>(val) || isa<GlobalValue>(val) &&
463 "I only know about constant values and global addresses");
465 // Use a "set" instruction for known constants or symbolic constants (labels)
466 // that can go in an integer reg.
467 // We have to use a "load" instruction for all other constants,
468 // in particular, floating point constants.
470 const Type* valType = val->getType();
472 // A ConstantPointerRef is just a reference to GlobalValue.
473 while (isa<ConstantPointerRef>(val))
474 val = cast<ConstantPointerRef>(val)->getValue();
476 if (isa<GlobalValue>(val)) {
477 TmpInstruction* tmpReg =
478 new TmpInstruction(mcfi, PointerType::get(val->getType()), val);
479 CreateSETXLabel(target, val, tmpReg, dest, mvec);
484 uint64_t C = ConvertConstantToIntType(target, val, dest->getType(), isValid);
486 if (dest->getType()->isSigned())
487 CreateUIntSetInstruction(target, C, dest, mvec, mcfi);
489 CreateIntSetInstruction(target, (int64_t) C, dest, mvec, mcfi);
492 // Make an instruction sequence to load the constant, viz:
493 // SETX <addr-of-constant>, tmpReg, addrReg
494 // LOAD /*addr*/ addrReg, /*offset*/ 0, dest
496 // First, create a tmp register to be used by the SETX sequence.
497 TmpInstruction* tmpReg =
498 new TmpInstruction(mcfi, PointerType::get(val->getType()));
500 // Create another TmpInstruction for the address register
501 TmpInstruction* addrReg =
502 new TmpInstruction(mcfi, PointerType::get(val->getType()));
504 // Get the constant pool index for this constant
505 MachineConstantPool *CP = MachineFunction::get(F).getConstantPool();
506 Constant *C = cast<Constant>(val);
507 unsigned CPI = CP->getConstantPoolIndex(C);
509 // Put the address of the constant into a register
512 MI = BuildMI(V9::SETHI, 2).addConstantPoolIndex(CPI).addRegDef(tmpReg);
513 MI->setOperandHi64(0);
516 MI = BuildMI(V9::ORi, 3).addReg(tmpReg).addConstantPoolIndex(CPI)
518 MI->setOperandLo64(1);
521 mvec.push_back(BuildMI(V9::SLLXi6, 3).addReg(tmpReg).addZImm(32)
523 MI = BuildMI(V9::SETHI, 2).addConstantPoolIndex(CPI).addRegDef(addrReg);
524 MI->setOperandHi32(0);
527 MI = BuildMI(V9::ORr, 3).addReg(addrReg).addReg(tmpReg).addRegDef(addrReg);
530 MI = BuildMI(V9::ORi, 3).addReg(addrReg).addConstantPoolIndex(CPI)
532 MI->setOperandLo32(1);
535 // Now load the constant from out ConstantPool label
536 unsigned Opcode = ChooseLoadInstruction(val->getType());
537 Opcode = convertOpcodeFromRegToImm(Opcode);
538 mvec.push_back(BuildMI(Opcode, 3)
539 .addReg(addrReg).addSImm((int64_t)0).addRegDef(dest));
544 // Create an instruction sequence to copy an integer register `val'
545 // to a floating point register `dest' by copying to memory and back.
546 // val must be an integral type. dest must be a Float or Double.
547 // The generated instructions are returned in `mvec'.
548 // Any temp. registers (TmpInstruction) created are recorded in mcfi.
549 // Any stack space required is allocated via MachineFunction.
552 SparcV9InstrInfo::CreateCodeToCopyIntToFloat(const TargetMachine& target,
556 std::vector<MachineInstr*>& mvec,
557 MachineCodeForInstruction& mcfi) const
559 assert((val->getType()->isIntegral() || isa<PointerType>(val->getType()))
560 && "Source type must be integral (integer or bool) or pointer");
561 assert(dest->getType()->isFloatingPoint()
562 && "Dest type must be float/double");
564 // Get a stack slot to use for the copy
565 int offset = MachineFunction::get(F).getInfo()->allocateLocalVar(val);
567 // Get the size of the source value being copied.
568 size_t srcSize = target.getTargetData().getTypeSize(val->getType());
570 // Store instruction stores `val' to [%fp+offset].
571 // The store and load opCodes are based on the size of the source value.
572 // If the value is smaller than 32 bits, we must sign- or zero-extend it
573 // to 32 bits since the load-float will load 32 bits.
574 // Note that the store instruction is the same for signed and unsigned ints.
575 const Type* storeType = (srcSize <= 4)? Type::IntTy : Type::LongTy;
576 Value* storeVal = val;
577 if (srcSize < target.getTargetData().getTypeSize(Type::FloatTy)) {
578 // sign- or zero-extend respectively
579 storeVal = new TmpInstruction(mcfi, storeType, val);
580 if (val->getType()->isSigned())
581 CreateSignExtensionInstructions(target, F, val, storeVal, 8*srcSize,
584 CreateZeroExtensionInstructions(target, F, val, storeVal, 8*srcSize,
588 unsigned FPReg = target.getRegInfo().getFramePointer();
589 unsigned StoreOpcode = ChooseStoreInstruction(storeType);
590 StoreOpcode = convertOpcodeFromRegToImm(StoreOpcode);
591 mvec.push_back(BuildMI(StoreOpcode, 3)
592 .addReg(storeVal).addMReg(FPReg).addSImm(offset));
594 // Load instruction loads [%fp+offset] to `dest'.
595 // The type of the load opCode is the floating point type that matches the
596 // stored type in size:
597 // On SparcV9: float for int or smaller, double for long.
599 const Type* loadType = (srcSize <= 4)? Type::FloatTy : Type::DoubleTy;
600 unsigned LoadOpcode = ChooseLoadInstruction(loadType);
601 LoadOpcode = convertOpcodeFromRegToImm(LoadOpcode);
602 mvec.push_back(BuildMI(LoadOpcode, 3)
603 .addMReg(FPReg).addSImm(offset).addRegDef(dest));
606 // Similarly, create an instruction sequence to copy an FP register
607 // `val' to an integer register `dest' by copying to memory and back.
608 // The generated instructions are returned in `mvec'.
609 // Any temp. virtual registers (TmpInstruction) created are recorded in mcfi.
610 // Temporary stack space required is allocated via MachineFunction.
613 SparcV9InstrInfo::CreateCodeToCopyFloatToInt(const TargetMachine& target,
617 std::vector<MachineInstr*>& mvec,
618 MachineCodeForInstruction& mcfi) const
620 const Type* opTy = val->getType();
621 const Type* destTy = dest->getType();
623 assert(opTy->isFloatingPoint() && "Source type must be float/double");
624 assert((destTy->isIntegral() || isa<PointerType>(destTy))
625 && "Dest type must be integer, bool or pointer");
627 // FIXME: For now, we allocate permanent space because the stack frame
628 // manager does not allow locals to be allocated (e.g., for alloca) after
629 // a temp is allocated!
631 int offset = MachineFunction::get(F).getInfo()->allocateLocalVar(val);
633 unsigned FPReg = target.getRegInfo().getFramePointer();
635 // Store instruction stores `val' to [%fp+offset].
636 // The store opCode is based only the source value being copied.
638 unsigned StoreOpcode = ChooseStoreInstruction(opTy);
639 StoreOpcode = convertOpcodeFromRegToImm(StoreOpcode);
640 mvec.push_back(BuildMI(StoreOpcode, 3)
641 .addReg(val).addMReg(FPReg).addSImm(offset));
643 // Load instruction loads [%fp+offset] to `dest'.
644 // The type of the load opCode is the integer type that matches the
645 // source type in size:
646 // On SparcV9: int for float, long for double.
647 // Note that we *must* use signed loads even for unsigned dest types, to
648 // ensure correct sign-extension for UByte, UShort or UInt:
650 const Type* loadTy = (opTy == Type::FloatTy)? Type::IntTy : Type::LongTy;
651 unsigned LoadOpcode = ChooseLoadInstruction(loadTy);
652 LoadOpcode = convertOpcodeFromRegToImm(LoadOpcode);
653 mvec.push_back(BuildMI(LoadOpcode, 3).addMReg(FPReg)
654 .addSImm(offset).addRegDef(dest));
658 // Create instruction(s) to copy src to dest, for arbitrary types
659 // The generated instructions are returned in `mvec'.
660 // Any temp. registers (TmpInstruction) created are recorded in mcfi.
661 // Any stack space required is allocated via MachineFunction.
664 SparcV9InstrInfo::CreateCopyInstructionsByType(const TargetMachine& target,
668 std::vector<MachineInstr*>& mvec,
669 MachineCodeForInstruction& mcfi) const
671 bool loadConstantToReg = false;
673 const Type* resultType = dest->getType();
675 MachineOpCode opCode = ChooseAddInstructionByType(resultType);
676 if (opCode == V9::INVALID_OPCODE) {
677 assert(0 && "Unsupported result type in CreateCopyInstructionsByType()");
681 // if `src' is a constant that doesn't fit in the immed field or if it is
682 // a global variable (i.e., a constant address), generate a load
683 // instruction instead of an add
685 if (isa<Constant>(src)) {
686 unsigned int machineRegNum;
688 MachineOperand::MachineOperandType opType =
689 ChooseRegOrImmed(src, opCode, target, /*canUseImmed*/ true,
690 machineRegNum, immedValue);
692 if (opType == MachineOperand::MO_VirtualRegister)
693 loadConstantToReg = true;
695 else if (isa<GlobalValue>(src))
696 loadConstantToReg = true;
698 if (loadConstantToReg) {
699 // `src' is constant and cannot fit in immed field for the ADD
700 // Insert instructions to "load" the constant into a register
701 target.getInstrInfo().CreateCodeToLoadConst(target, F, src, dest,
704 // Create a reg-to-reg copy instruction for the given type:
705 // -- For FP values, create a FMOVS or FMOVD instruction
706 // -- For non-FP values, create an add-with-0 instruction (opCode as above)
707 // Make `src' the second operand, in case it is a small constant!
710 if (resultType->isFloatingPoint())
711 MI = (BuildMI(resultType == Type::FloatTy? V9::FMOVS : V9::FMOVD, 2)
712 .addReg(src).addRegDef(dest));
714 const Type* Ty =isa<PointerType>(resultType)? Type::ULongTy :resultType;
715 MI = (BuildMI(opCode, 3)
716 .addSImm((int64_t) 0).addReg(src).addRegDef(dest));
723 // Helper function for sign-extension and zero-extension.
724 // For SPARC v9, we sign-extend the given operand using SLL; SRA/SRL.
726 CreateBitExtensionInstructions(bool signExtend,
727 const TargetMachine& target,
731 unsigned int numLowBits,
732 std::vector<MachineInstr*>& mvec,
733 MachineCodeForInstruction& mcfi)
737 assert(numLowBits <= 32 && "Otherwise, nothing should be done here!");
739 if (numLowBits < 32) {
740 // SLL is needed since operand size is < 32 bits.
741 TmpInstruction *tmpI = new TmpInstruction(mcfi, destVal->getType(),
742 srcVal, destVal, "make32");
743 mvec.push_back(BuildMI(V9::SLLXi6, 3).addReg(srcVal)
744 .addZImm(32-numLowBits).addRegDef(tmpI));
748 mvec.push_back(BuildMI(signExtend? V9::SRAi5 : V9::SRLi5, 3)
749 .addReg(srcVal).addZImm(32-numLowBits).addRegDef(destVal));
753 // Create instruction sequence to produce a sign-extended register value
754 // from an arbitrary-sized integer value (sized in bits, not bytes).
755 // The generated instructions are returned in `mvec'.
756 // Any temp. registers (TmpInstruction) created are recorded in mcfi.
757 // Any stack space required is allocated via MachineFunction.
760 SparcV9InstrInfo::CreateSignExtensionInstructions(
761 const TargetMachine& target,
765 unsigned int numLowBits,
766 std::vector<MachineInstr*>& mvec,
767 MachineCodeForInstruction& mcfi) const
769 CreateBitExtensionInstructions(/*signExtend*/ true, target, F, srcVal,
770 destVal, numLowBits, mvec, mcfi);
774 // Create instruction sequence to produce a zero-extended register value
775 // from an arbitrary-sized integer value (sized in bits, not bytes).
776 // For SPARC v9, we sign-extend the given operand using SLL; SRL.
777 // The generated instructions are returned in `mvec'.
778 // Any temp. registers (TmpInstruction) created are recorded in mcfi.
779 // Any stack space required is allocated via MachineFunction.
782 SparcV9InstrInfo::CreateZeroExtensionInstructions(
783 const TargetMachine& target,
787 unsigned int numLowBits,
788 std::vector<MachineInstr*>& mvec,
789 MachineCodeForInstruction& mcfi) const
791 CreateBitExtensionInstructions(/*signExtend*/ false, target, F, srcVal,
792 destVal, numLowBits, mvec, mcfi);
795 } // End llvm namespace