| //===-- SparcInstrInfo.h - Define TargetInstrInfo for Sparc -----*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This class contains information about individual instructions. |
| // Most information is stored in the SparcMachineInstrDesc array above. |
| // Other information is computed on demand, and most such functions |
| // default to member functions in base class TargetInstrInfo. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef SPARC_INSTRINFO_H |
| #define SPARC_INSTRINFO_H |
| |
| #include "llvm/Target/TargetInstrInfo.h" |
| #include "llvm/CodeGen/MachineInstr.h" |
| #include "SparcInternals.h" |
| |
| namespace llvm { |
| |
| struct SparcInstrInfo : public TargetInstrInfo { |
| SparcInstrInfo(); |
| |
| // All immediate constants are in position 1 except the |
| // store instructions and SETxx. |
| // |
| virtual int getImmedConstantPos(MachineOpCode opCode) const { |
| bool ignore; |
| if (this->maxImmedConstant(opCode, ignore) != 0) { |
| // 1st store opcode |
| assert(! this->isStore((MachineOpCode) V9::STBr - 1)); |
| // last store opcode |
| assert(! this->isStore((MachineOpCode) V9::STXFSRi + 1)); |
| |
| if (opCode == V9::SETSW || opCode == V9::SETUW || |
| opCode == V9::SETX || opCode == V9::SETHI) |
| return 0; |
| if (opCode >= V9::STBr && opCode <= V9::STXFSRi) |
| return 2; |
| return 1; |
| } |
| else |
| return -1; |
| } |
| |
| /// createNOPinstr - returns the target's implementation of NOP, which is |
| /// usually a pseudo-instruction, implemented by a degenerate version of |
| /// another instruction, e.g. X86: xchg ax, ax; SparcV9: sethi 0, g0 |
| /// |
| MachineInstr* createNOPinstr() const { |
| return BuildMI(V9::SETHI, 2).addZImm(0).addReg(SparcIntRegClass::g0); |
| } |
| |
| /// isNOPinstr - not having a special NOP opcode, we need to know if a given |
| /// instruction is interpreted as an `official' NOP instr, i.e., there may be |
| /// more than one way to `do nothing' but only one canonical way to slack off. |
| /// |
| bool isNOPinstr(const MachineInstr &MI) const { |
| // Make sure the instruction is EXACTLY `sethi g0, 0' |
| if (MI.getOpcode() == V9::SETHI && MI.getNumOperands() == 2) { |
| const MachineOperand &op0 = MI.getOperand(0), &op1 = MI.getOperand(1); |
| if (op0.isImmediate() && op0.getImmedValue() == 0 && |
| op1.isMachineRegister() && |
| op1.getMachineRegNum() == SparcIntRegClass::g0) |
| { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| virtual bool hasResultInterlock(MachineOpCode opCode) const |
| { |
| // All UltraSPARC instructions have interlocks (note that delay slots |
| // are not considered here). |
| // However, instructions that use the result of an FCMP produce a |
| // 9-cycle stall if they are issued less than 3 cycles after the FCMP. |
| // Force the compiler to insert a software interlock (i.e., gap of |
| // 2 other groups, including NOPs if necessary). |
| return (opCode == V9::FCMPS || opCode == V9::FCMPD || opCode == V9::FCMPQ); |
| } |
| |
| //------------------------------------------------------------------------- |
| // Queries about representation of LLVM quantities (e.g., constants) |
| //------------------------------------------------------------------------- |
| |
| virtual bool ConstantMayNotFitInImmedField(const Constant* CV, |
| const Instruction* I) const; |
| |
| //------------------------------------------------------------------------- |
| // Code generation support for creating individual machine instructions |
| //------------------------------------------------------------------------- |
| |
| // Get certain common op codes for the current target. This and all the |
| // Create* methods below should be moved to a machine code generation class |
| // |
| virtual MachineOpCode getNOPOpCode() const { return V9::NOP; } |
| |
| // Get the value of an integral constant in the form that must |
| // be put into the machine register. The specified constant is interpreted |
| // as (i.e., converted if necessary to) the specified destination type. The |
| // result is always returned as an uint64_t, since the representation of |
| // int64_t and uint64_t are identical. The argument can be any known const. |
| // |
| // isValidConstant is set to true if a valid constant was found. |
| // |
| virtual uint64_t ConvertConstantToIntType(const TargetMachine &target, |
| const Value *V, |
| const Type *destType, |
| bool &isValidConstant) const; |
| |
| // Create an instruction sequence to put the constant `val' into |
| // the virtual register `dest'. `val' may be a Constant or a |
| // 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 mcff. |
| // |
| virtual void CreateCodeToLoadConst(const TargetMachine& target, |
| Function* F, |
| Value* val, |
| Instruction* dest, |
| std::vector<MachineInstr*>& mvec, |
| MachineCodeForInstruction& mcfi) const; |
| |
| // Create an instruction sequence to copy an integer value `val' |
| // to a floating point value `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 mcff. |
| // |
| virtual void CreateCodeToCopyIntToFloat(const TargetMachine& target, |
| Function* F, |
| Value* val, |
| Instruction* dest, |
| std::vector<MachineInstr*>& mvec, |
| MachineCodeForInstruction& mcfi) const; |
| |
| // Similarly, create an instruction sequence to copy an FP value |
| // `val' to an integer value `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 mcff. |
| // |
| virtual void CreateCodeToCopyFloatToInt(const TargetMachine& target, |
| Function* F, |
| Value* val, |
| Instruction* dest, |
| std::vector<MachineInstr*>& mvec, |
| MachineCodeForInstruction& mcfi) const; |
| |
| // 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 mcff. |
| // |
| virtual void CreateCopyInstructionsByType(const TargetMachine& target, |
| Function* F, |
| Value* src, |
| Instruction* dest, |
| std::vector<MachineInstr*>& mvec, |
| MachineCodeForInstruction& mcfi) const; |
| |
| // Create instruction sequence to produce a sign-extended register value |
| // from an arbitrary sized value (sized in bits, not bytes). |
| // The generated instructions are appended to `mvec'. |
| // Any temp. registers (TmpInstruction) created are recorded in mcfi. |
| // Any stack space required is allocated via mcff. |
| // |
| virtual void CreateSignExtensionInstructions(const TargetMachine& target, |
| Function* F, |
| Value* srcVal, |
| Value* destVal, |
| unsigned int numLowBits, |
| std::vector<MachineInstr*>& mvec, |
| MachineCodeForInstruction& mcfi) const; |
| |
| // Create instruction sequence to produce a zero-extended register value |
| // from an arbitrary sized value (sized in bits, not bytes). |
| // The generated instructions are appended to `mvec'. |
| // Any temp. registers (TmpInstruction) created are recorded in mcfi. |
| // Any stack space required is allocated via mcff. |
| // |
| virtual void CreateZeroExtensionInstructions(const TargetMachine& target, |
| Function* F, |
| Value* srcVal, |
| Value* destVal, |
| unsigned int numLowBits, |
| std::vector<MachineInstr*>& mvec, |
| MachineCodeForInstruction& mcfi) const; |
| }; |
| |
| } // End llvm namespace |
| |
| #endif |