X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FSparcV9%2FSparcV9InstrInfo.cpp;h=134bdacae07ce6faf68a3ad4dbb2c5605cfb0651;hb=f44f905196d9e83f5a8878211ed8f82634f1ed3d;hp=bf522d91067682ba8634bc7bba56cc3f1558638f;hpb=035dfbe7f2d109008d2d62d9f2a67efb477a7ab6;p=oota-llvm.git diff --git a/lib/Target/SparcV9/SparcV9InstrInfo.cpp b/lib/Target/SparcV9/SparcV9InstrInfo.cpp index bf522d91067..134bdacae07 100644 --- a/lib/Target/SparcV9/SparcV9InstrInfo.cpp +++ b/lib/Target/SparcV9/SparcV9InstrInfo.cpp @@ -6,35 +6,50 @@ #include "SparcInstrSelectionSupport.h" #include "llvm/CodeGen/InstrSelection.h" #include "llvm/CodeGen/InstrSelectionSupport.h" -#include "llvm/CodeGen/MachineCodeForMethod.h" +#include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineCodeForInstruction.h" #include "llvm/Function.h" #include "llvm/Constants.h" #include "llvm/DerivedTypes.h" +#include using std::vector; static const uint32_t MAXLO = (1 << 10) - 1; // set bits set by %lo(*) static const uint32_t MAXSIMM = (1 << 12) - 1; // set bits in simm13 field of OR -// Set a 32-bit unsigned constant in the register `dest'. +//---------------------------------------------------------------------------- +// Function: CreateSETUWConst // +// Set a 32-bit unsigned constant in the register `dest', using +// SETHI, OR in the worst case. This function correctly emulates +// the SETUW pseudo-op for SPARC v9 (if argument isSigned == false). +// +// The isSigned=true case is used to implement SETSW without duplicating code. +// +// Optimize some common cases: +// (1) Small value that fits in simm13 field of OR: don't need SETHI. +// (2) isSigned = true and C is a small negative signed value, i.e., +// high bits are 1, and the remaining bits fit in simm13(OR). +//---------------------------------------------------------------------------- + static inline void CreateSETUWConst(const TargetMachine& target, uint32_t C, - Instruction* dest, vector& mvec) + Instruction* dest, vector& mvec, + bool isSigned = false) { MachineInstr *miSETHI = NULL, *miOR = NULL; - + // In order to get efficient code, we should not generate the SETHI if // all high bits are 1 (i.e., this is a small signed value that fits in // the simm13 field of OR). So we check for and handle that case specially. // NOTE: The value C = 0x80000000 is bad: sC < 0 *and* -sC < 0. // In fact, sC == -sC, so we have to check for this explicitly. int32_t sC = (int32_t) C; - bool smallSignedValue = sC < 0 && sC != -sC && -sC < (int32_t) MAXSIMM; - + bool smallNegValue =isSigned && sC < 0 && sC != -sC && -sC < (int32_t)MAXSIMM; + // Set the high 22 bits in dest if non-zero and simm13 field of OR not enough - if (!smallSignedValue && (C & ~MAXLO) && C > MAXSIMM) + if (!smallNegValue && (C & ~MAXLO) && C > MAXSIMM) { miSETHI = Create2OperandInstr_UImmed(SETHI, C, dest); miSETHI->setOperandHi32(0); @@ -52,7 +67,7 @@ CreateSETUWConst(const TargetMachine& target, uint32_t C, } else { // unsigned or small signed value that fits in simm13 field of OR - assert(smallSignedValue || (C & ~MAXSIMM) == 0); + assert(smallNegValue || (C & ~MAXSIMM) == 0); miOR = new MachineInstr(OR); miOR->SetMachineOperandReg(0, target.getRegInfo().getZeroRegNum()); miOR->SetMachineOperandConst(1, MachineOperand::MO_SignExtendedImmed, @@ -65,37 +80,27 @@ CreateSETUWConst(const TargetMachine& target, uint32_t C, assert((miSETHI || miOR) && "Oops, no code was generated!"); } -// Set a 32-bit constant (given by a symbolic label) in the register `dest'. -// Not needed for SPARC v9 but useful to make the two SETX functions similar -static inline void -CreateSETUWLabel(const TargetMachine& target, Value* val, - Instruction* dest, vector& mvec) -{ - MachineInstr* MI; - - // Set the high 22 bits in dest - MI = Create2OperandInstr(SETHI, val, dest); - MI->setOperandHi32(0); - mvec.push_back(MI); - - // Set the low 10 bits in dest - MI = Create3OperandInstr(OR, dest, val, dest); - MI->setOperandLo32(1); - mvec.push_back(MI); -} +//---------------------------------------------------------------------------- +// Function: CreateSETSWConst +// +// Set a 32-bit signed constant in the register `dest', with sign-extension +// to 64 bits. This uses SETHI, OR, SRA in the worst case. +// This function correctly emulates the SETSW pseudo-op for SPARC v9. +// +// Optimize the same cases as SETUWConst, plus: +// (1) SRA is not needed for positive or small negative values. +//---------------------------------------------------------------------------- -// Set a 32-bit signed constant in the register `dest', -// with sign-extension to 64 bits. static inline void CreateSETSWConst(const TargetMachine& target, int32_t C, Instruction* dest, vector& mvec) { MachineInstr* MI; - + // Set the low 32 bits of dest - CreateSETUWConst(target, (uint32_t) C, dest, mvec); - + CreateSETUWConst(target, (uint32_t) C, dest, mvec, /*isSigned*/true); + // Sign-extend to the high 32 bits if needed if (C < 0 && (-C) > (int32_t) MAXSIMM) { @@ -105,7 +110,16 @@ CreateSETSWConst(const TargetMachine& target, int32_t C, } +//---------------------------------------------------------------------------- +// Function: CreateSETXConst +// // Set a 64-bit signed or unsigned constant in the register `dest'. +// Use SETUWConst for each 32 bit word, plus a left-shift-by-32 in between. +// This function correctly emulates the SETX pseudo-op for SPARC v9. +// +// Optimize the same cases as SETUWConst for each 32 bit word. +//---------------------------------------------------------------------------- + static inline void CreateSETXConst(const TargetMachine& target, uint64_t C, Instruction* tmpReg, Instruction* dest, @@ -131,7 +145,36 @@ CreateSETXConst(const TargetMachine& target, uint64_t C, } +//---------------------------------------------------------------------------- +// Function: CreateSETUWLabel +// +// Set a 32-bit constant (given by a symbolic label) in the register `dest'. +//---------------------------------------------------------------------------- + +static inline void +CreateSETUWLabel(const TargetMachine& target, Value* val, + Instruction* dest, vector& mvec) +{ + MachineInstr* MI; + + // Set the high 22 bits in dest + MI = Create2OperandInstr(SETHI, val, dest); + MI->setOperandHi32(0); + mvec.push_back(MI); + + // Set the low 10 bits in dest + MI = Create3OperandInstr(OR, dest, val, dest); + MI->setOperandLo32(1); + mvec.push_back(MI); +} + + +//---------------------------------------------------------------------------- +// Function: CreateSETXLabel +// // Set a 64-bit constant (given by a symbolic label) in the register `dest'. +//---------------------------------------------------------------------------- + static inline void CreateSETXLabel(const TargetMachine& target, Value* val, Instruction* tmpReg, Instruction* dest, @@ -166,47 +209,108 @@ CreateSETXLabel(const TargetMachine& target, } +//---------------------------------------------------------------------------- +// Function: CreateUIntSetInstruction +// +// Create code to Set an unsigned constant in the register `dest'. +// Uses CreateSETUWConst, CreateSETSWConst or CreateSETXConst as needed. +// CreateSETSWConst is an optimization for the case that the unsigned value +// has all ones in the 33 high bits (so that sign-extension sets them all). +//---------------------------------------------------------------------------- + static inline void -CreateIntSetInstruction(const TargetMachine& target, - int64_t C, Instruction* dest, - vector& mvec, - MachineCodeForInstruction& mcfi) +CreateUIntSetInstruction(const TargetMachine& target, + uint64_t C, Instruction* dest, + std::vector& mvec, + MachineCodeForInstruction& mcfi) { - assert(dest->getType()->isSigned() && "Use CreateUIntSetInstruction()"); - - uint64_t absC = (C >= 0)? C : -C; - if (absC > (uint32_t) ~0) + static const uint64_t lo32 = (uint32_t) ~0; + if (C <= lo32) // High 32 bits are 0. Set low 32 bits. + CreateSETUWConst(target, (uint32_t) C, dest, mvec); + else if ((C & ~lo32) == ~lo32 && (C & (1 << 31))) + { // All high 33 (not 32) bits are 1s: sign-extension will take care + // of high 32 bits, so use the sequence for signed int + CreateSETSWConst(target, (int32_t) C, dest, mvec); + } + else if (C > lo32) { // C does not fit in 32 bits TmpInstruction* tmpReg = new TmpInstruction(Type::IntTy); mcfi.addTemp(tmpReg); - CreateSETXConst(target, (uint64_t) C, tmpReg, dest, mvec); + CreateSETXConst(target, C, tmpReg, dest, mvec); } - else - CreateSETSWConst(target, (int32_t) C, dest, mvec); } +//---------------------------------------------------------------------------- +// Function: CreateIntSetInstruction +// +// Create code to Set a signed constant in the register `dest'. +// Really the same as CreateUIntSetInstruction. +//---------------------------------------------------------------------------- + static inline void -CreateUIntSetInstruction(const TargetMachine& target, - uint64_t C, Instruction* dest, - vector& mvec, - MachineCodeForInstruction& mcfi) +CreateIntSetInstruction(const TargetMachine& target, + int64_t C, Instruction* dest, + std::vector& mvec, + MachineCodeForInstruction& mcfi) { - assert(! dest->getType()->isSigned() && "Use CreateIntSetInstruction()"); - MachineInstr* M; - - if (C > (uint32_t) ~0) - { // C does not fit in 32 bits - assert(dest->getType() == Type::ULongTy && "Sign extension problems"); - TmpInstruction *tmpReg = new TmpInstruction(Type::IntTy); - mcfi.addTemp(tmpReg); - CreateSETXConst(target, C, tmpReg, dest, mvec); - } - else - CreateSETUWConst(target, C, dest, mvec); + CreateUIntSetInstruction(target, (uint64_t) C, dest, mvec, mcfi); } +//--------------------------------------------------------------------------- +// Create a table of LLVM opcode -> max. immediate constant likely to +// be usable for that operation. +//--------------------------------------------------------------------------- + +// Entry == 0 ==> no immediate constant field exists at all. +// Entry > 0 ==> abs(immediate constant) <= Entry +// +vector MaxConstantsTable(Instruction::OtherOpsEnd); + +static int +MaxConstantForInstr(unsigned llvmOpCode) +{ + int modelOpCode = -1; + + if (llvmOpCode >= Instruction::BinaryOpsBegin && + llvmOpCode < Instruction::BinaryOpsEnd) + modelOpCode = ADD; + else + switch(llvmOpCode) { + case Instruction::Ret: modelOpCode = JMPLCALL; break; + + case Instruction::Malloc: + case Instruction::Alloca: + case Instruction::GetElementPtr: + case Instruction::PHINode: + case Instruction::Cast: + case Instruction::Call: modelOpCode = ADD; break; + + case Instruction::Shl: + case Instruction::Shr: modelOpCode = SLLX; break; + + default: break; + }; + + return (modelOpCode < 0)? 0: SparcMachineInstrDesc[modelOpCode].maxImmedConst; +} + +static void +InitializeMaxConstantsTable() +{ + unsigned op; + assert(MaxConstantsTable.size() == Instruction::OtherOpsEnd && + "assignments below will be illegal!"); + for (op = Instruction::TermOpsBegin; op < Instruction::TermOpsEnd; ++op) + MaxConstantsTable[op] = MaxConstantForInstr(op); + for (op = Instruction::BinaryOpsBegin; op < Instruction::BinaryOpsEnd; ++op) + MaxConstantsTable[op] = MaxConstantForInstr(op); + for (op = Instruction::MemoryOpsBegin; op < Instruction::MemoryOpsEnd; ++op) + MaxConstantsTable[op] = MaxConstantForInstr(op); + for (op = Instruction::OtherOpsBegin; op < Instruction::OtherOpsEnd; ++op) + MaxConstantsTable[op] = MaxConstantForInstr(op); +} //--------------------------------------------------------------------------- @@ -220,11 +324,35 @@ CreateUIntSetInstruction(const TargetMachine& target, //--------------------------------------------------------------------------- /*ctor*/ -UltraSparcInstrInfo::UltraSparcInstrInfo(const TargetMachine& tgt) - : MachineInstrInfo(tgt, SparcMachineInstrDesc, +UltraSparcInstrInfo::UltraSparcInstrInfo() + : MachineInstrInfo(SparcMachineInstrDesc, /*descSize = */ NUM_TOTAL_OPCODES, /*numRealOpCodes = */ NUM_REAL_OPCODES) { + InitializeMaxConstantsTable(); +} + +bool +UltraSparcInstrInfo::ConstantMayNotFitInImmedField(const Constant* CV, + const Instruction* I) const +{ + if (I->getOpcode() >= MaxConstantsTable.size()) // user-defined op (or bug!) + return true; + + if (isa(CV)) // can always use %g0 + return false; + + if (const ConstantUInt* U = dyn_cast(CV)) + /* Large unsigned longs may really just be small negative signed longs */ + return (labs((int64_t) U->getValue()) > MaxConstantsTable[I->getOpcode()]); + + if (const ConstantSInt* S = dyn_cast(CV)) + return (labs(S->getValue()) > MaxConstantsTable[I->getOpcode()]); + + if (isa(CV)) + return (1 > MaxConstantsTable[I->getOpcode()]); + + return true; } // @@ -233,7 +361,7 @@ UltraSparcInstrInfo::UltraSparcInstrInfo(const TargetMachine& tgt) // GlobalValue, viz., the constant address of a global variable or function. // The generated instructions are returned in `mvec'. // Any temp. registers (TmpInstruction) created are recorded in mcfi. -// Any stack space required is allocated via MachineCodeForMethod. +// Any stack space required is allocated via MachineFunction. // void UltraSparcInstrInfo::CreateCodeToLoadConst(const TargetMachine& target, @@ -253,27 +381,56 @@ UltraSparcInstrInfo::CreateCodeToLoadConst(const TargetMachine& target, // const Type* valType = val->getType(); - if (isa(val) || valType->isIntegral() || valType == Type::BoolTy) + // Unfortunate special case: a ConstantPointerRef is just a + // reference to GlobalValue. + if (isa(val)) + val = cast(val)->getValue(); + + if (isa(val)) { - if (isa(val)) - { - TmpInstruction* tmpReg = - new TmpInstruction(PointerType::get(val->getType()), val); - mcfi.addTemp(tmpReg); - CreateSETXLabel(target, val, tmpReg, dest, mvec); - } - else if (! dest->getType()->isSigned()) + TmpInstruction* tmpReg = + new TmpInstruction(PointerType::get(val->getType()), val); + mcfi.addTemp(tmpReg); + CreateSETXLabel(target, val, tmpReg, dest, mvec); + } + else if (valType->isIntegral()) + { + bool isValidConstant; + unsigned opSize = target.DataLayout.getTypeSize(val->getType()); + unsigned destSize = target.DataLayout.getTypeSize(dest->getType()); + + if (! dest->getType()->isSigned()) { - bool isValidConstant; uint64_t C = GetConstantValueAsUnsignedInt(val, isValidConstant); assert(isValidConstant && "Unrecognized constant"); + + if (opSize > destSize || + (val->getType()->isSigned() + && destSize < target.DataLayout.getIntegerRegize())) + { // operand is larger than dest, + // OR both are equal but smaller than the full register size + // AND operand is signed, so it may have extra sign bits: + // mask high bits + C = C & ((1U << 8*destSize) - 1); + } CreateUIntSetInstruction(target, C, dest, mvec, mcfi); } else { - bool isValidConstant; int64_t C = GetConstantValueAsSignedInt(val, isValidConstant); assert(isValidConstant && "Unrecognized constant"); + + if (opSize > destSize) + // operand is larger than dest: mask high bits + C = C & ((1U << 8*destSize) - 1); + + if (opSize > destSize || + (opSize == destSize && !val->getType()->isSigned())) + // sign-extend from destSize to 64 bits + C = ((C & (1U << (8*destSize - 1))) + ? C | ~((1U << 8*destSize) - 1) + : C); + CreateIntSetInstruction(target, C, dest, mvec, mcfi); } } @@ -304,17 +461,17 @@ UltraSparcInstrInfo::CreateCodeToLoadConst(const TargetMachine& target, mvec.push_back(MI); // Make sure constant is emitted to constant pool in assembly code. - MachineCodeForMethod::get(F).addToConstantPool(cast(val)); + MachineFunction::get(F).addToConstantPool(cast(val)); } } -// Create an instruction sequence to copy an integer value `val' -// to a floating point value `dest' by copying to memory and back. +// Create an instruction sequence to copy an integer register `val' +// to a floating point register `dest' by copying to memory and back. // val must be an integral type. dest must be a Float or Double. // The generated instructions are returned in `mvec'. // Any temp. registers (TmpInstruction) created are recorded in mcfi. -// Any stack space required is allocated via MachineCodeForMethod. +// Any stack space required is allocated via MachineFunction. // void UltraSparcInstrInfo::CreateCodeToCopyIntToFloat(const TargetMachine& target, @@ -325,41 +482,57 @@ UltraSparcInstrInfo::CreateCodeToCopyIntToFloat(const TargetMachine& target, MachineCodeForInstruction& mcfi) const { assert((val->getType()->isIntegral() || isa(val->getType())) - && "Source type must be integral"); + && "Source type must be integral (integer or bool) or pointer"); assert(dest->getType()->isFloatingPoint() && "Dest type must be float/double"); - - int offset = MachineCodeForMethod::get(F).allocateLocalVar(target, val); - + + // Get a stack slot to use for the copy + int offset = MachineFunction::get(F).allocateLocalVar(target, val); + + // Get the size of the source value being copied. + size_t srcSize = target.DataLayout.getTypeSize(val->getType()); + // Store instruction stores `val' to [%fp+offset]. - // The store and load opCodes are based on the value being copied, and - // they use integer and float types that accomodate the - // larger of the source type and the destination type: - // On SparcV9: int for float, long for double. + // The store and load opCodes are based on the size of the source value. + // If the value is smaller than 32 bits, we must sign- or zero-extend it + // to 32 bits since the load-float will load 32 bits. // Note that the store instruction is the same for signed and unsigned ints. - Type* tmpType = (dest->getType() == Type::FloatTy)? Type::IntTy - : Type::LongTy; - MachineInstr* store = new MachineInstr(ChooseStoreInstruction(tmpType)); - store->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister, val); + const Type* storeType = (srcSize <= 4)? Type::IntTy : Type::LongTy; + Value* storeVal = val; + if (srcSize < target.DataLayout.getTypeSize(Type::FloatTy)) + { // sign- or zero-extend respectively + storeVal = new TmpInstruction(storeType, val); + if (val->getType()->isSigned()) + CreateSignExtensionInstructions(target, F, val, storeVal, 8*srcSize, + mvec, mcfi); + else + CreateZeroExtensionInstructions(target, F, val, storeVal, 8*srcSize, + mvec, mcfi); + } + MachineInstr* store=new MachineInstr(ChooseStoreInstruction(storeType)); + store->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister, storeVal); store->SetMachineOperandReg(1, target.getRegInfo().getFramePointer()); store->SetMachineOperandConst(2,MachineOperand::MO_SignExtendedImmed,offset); mvec.push_back(store); // Load instruction loads [%fp+offset] to `dest'. + // The type of the load opCode is the floating point type that matches the + // stored type in size: + // On SparcV9: float for int or smaller, double for long. // - MachineInstr* load =new MachineInstr(ChooseLoadInstruction(dest->getType())); + const Type* loadType = (srcSize <= 4)? Type::FloatTy : Type::DoubleTy; + MachineInstr* load = new MachineInstr(ChooseLoadInstruction(loadType)); load->SetMachineOperandReg(0, target.getRegInfo().getFramePointer()); load->SetMachineOperandConst(1, MachineOperand::MO_SignExtendedImmed,offset); load->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister, dest); mvec.push_back(load); } - -// Similarly, create an instruction sequence to copy an FP value -// `val' to an integer value `dest' by copying to memory and back. +// Similarly, create an instruction sequence to copy an FP register +// `val' to an integer register `dest' by copying to memory and back. // The generated instructions are returned in `mvec'. // Any temp. registers (TmpInstruction) created are recorded in mcfi. -// Any stack space required is allocated via MachineCodeForMethod. +// Any stack space required is allocated via MachineFunction. // void UltraSparcInstrInfo::CreateCodeToCopyFloatToInt(const TargetMachine& target, @@ -371,30 +544,30 @@ UltraSparcInstrInfo::CreateCodeToCopyFloatToInt(const TargetMachine& target, { const Type* opTy = val->getType(); const Type* destTy = dest->getType(); - + assert(opTy->isFloatingPoint() && "Source type must be float/double"); assert((destTy->isIntegral() || isa(destTy)) - && "Dest type must be integral"); + && "Dest type must be integer, bool or pointer"); + + int offset = MachineFunction::get(F).allocateLocalVar(target, val); - int offset = MachineCodeForMethod::get(F).allocateLocalVar(target, val); - // Store instruction stores `val' to [%fp+offset]. // The store opCode is based only the source value being copied. // - MachineInstr* store=new MachineInstr(ChooseStoreInstruction(val->getType())); + MachineInstr* store=new MachineInstr(ChooseStoreInstruction(opTy)); store->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister, val); store->SetMachineOperandReg(1, target.getRegInfo().getFramePointer()); store->SetMachineOperandConst(2,MachineOperand::MO_SignExtendedImmed,offset); mvec.push_back(store); - + // Load instruction loads [%fp+offset] to `dest'. // The type of the load opCode is the integer type that matches the - // source type in size: (and the dest type in sign): + // source type in size: // On SparcV9: int for float, long for double. // Note that we *must* use signed loads even for unsigned dest types, to - // ensure that we get the right sign-extension for smaller-than-64-bit - // unsigned dest. types (i.e., UByte, UShort or UInt): - const Type* loadTy = opTy == Type::FloatTy? Type::IntTy : Type::LongTy; + // ensure correct sign-extension for UByte, UShort or UInt: + // + const Type* loadTy = (opTy == Type::FloatTy)? Type::IntTy : Type::LongTy; MachineInstr* load = new MachineInstr(ChooseLoadInstruction(loadTy)); load->SetMachineOperandReg(0, target.getRegInfo().getFramePointer()); load->SetMachineOperandConst(1, MachineOperand::MO_SignExtendedImmed,offset); @@ -406,7 +579,7 @@ UltraSparcInstrInfo::CreateCodeToCopyFloatToInt(const TargetMachine& target, // Create instruction(s) to copy src to dest, for arbitrary types // The generated instructions are returned in `mvec'. // Any temp. registers (TmpInstruction) created are recorded in mcfi. -// Any stack space required is allocated via MachineCodeForMethod. +// Any stack space required is allocated via MachineFunction. // void UltraSparcInstrInfo::CreateCopyInstructionsByType(const TargetMachine& target, @@ -466,38 +639,76 @@ UltraSparcInstrInfo::CreateCopyInstructionsByType(const TargetMachine& target, } +// Helper function for sign-extension and zero-extension. +// For SPARC v9, we sign-extend the given operand using SLL; SRA/SRL. +inline void +CreateBitExtensionInstructions(bool signExtend, + const TargetMachine& target, + Function* F, + Value* srcVal, + Value* destVal, + unsigned int numLowBits, + vector& mvec, + MachineCodeForInstruction& mcfi) +{ + MachineInstr* M; + + assert(numLowBits <= 32 && "Otherwise, nothing should be done here!"); + + if (numLowBits < 32) + { // SLL is needed since operand size is < 32 bits. + TmpInstruction *tmpI = new TmpInstruction(destVal->getType(), + srcVal, destVal, "make32"); + mcfi.addTemp(tmpI); + M = Create3OperandInstr_UImmed(SLLX, srcVal, 32-numLowBits, tmpI); + mvec.push_back(M); + srcVal = tmpI; + } + + M = Create3OperandInstr_UImmed(signExtend? SRA : SRL, + srcVal, 32-numLowBits, destVal); + mvec.push_back(M); +} + + // Create instruction sequence to produce a sign-extended register value -// from an arbitrary sized value (sized in bits, not bytes). -// For SPARC v9, we sign-extend the given unsigned operand using SLL; SRA. +// from an arbitrary-sized integer value (sized in bits, not bytes). // The generated instructions are returned in `mvec'. // Any temp. registers (TmpInstruction) created are recorded in mcfi. -// Any stack space required is allocated via MachineCodeForMethod. +// Any stack space required is allocated via MachineFunction. // void UltraSparcInstrInfo::CreateSignExtensionInstructions( const TargetMachine& target, Function* F, - Value* unsignedSrcVal, - unsigned int srcSizeInBits, - Value* dest, + Value* srcVal, + Value* destVal, + unsigned int numLowBits, vector& mvec, MachineCodeForInstruction& mcfi) const { - MachineInstr* M; - assert(srcSizeInBits < 64 && "Sign extension unnecessary!"); - assert(srcSizeInBits > 0 && srcSizeInBits <= 32 - && "Hmmm... 32 < srcSizeInBits < 64 unexpected but could be handled here."); - - if (srcSizeInBits < 32) - { // SLL is needed since operand size is < 32 bits. - TmpInstruction *tmpI = new TmpInstruction(dest->getType(), - unsignedSrcVal, dest,"make32"); - mcfi.addTemp(tmpI); - M = Create3OperandInstr_UImmed(SLL,unsignedSrcVal,32-srcSizeInBits,tmpI); - mvec.push_back(M); - unsignedSrcVal = tmpI; - } - - M = Create3OperandInstr_UImmed(SRA, unsignedSrcVal, 32-srcSizeInBits, dest); - mvec.push_back(M); + CreateBitExtensionInstructions(/*signExtend*/ true, target, F, srcVal, + destVal, numLowBits, mvec, mcfi); +} + + +// Create instruction sequence to produce a zero-extended register value +// from an arbitrary-sized integer value (sized in bits, not bytes). +// For SPARC v9, we sign-extend the given operand using SLL; SRL. +// The generated instructions are returned in `mvec'. +// Any temp. registers (TmpInstruction) created are recorded in mcfi. +// Any stack space required is allocated via MachineFunction. +// +void +UltraSparcInstrInfo::CreateZeroExtensionInstructions( + const TargetMachine& target, + Function* F, + Value* srcVal, + Value* destVal, + unsigned int numLowBits, + vector& mvec, + MachineCodeForInstruction& mcfi) const +{ + CreateBitExtensionInstructions(/*signExtend*/ false, target, F, srcVal, + destVal, numLowBits, mvec, mcfi); }