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//===- MipsInstrInfo.h - Mips Instruction Information -----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the Mips implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#ifndef MIPSINSTRUCTIONINFO_H
#define MIPSINSTRUCTIONINFO_H
#include "Mips.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "MipsRegisterInfo.h"
namespace llvm {
namespace Mips {
// Mips Branch Codes
enum FPBranchCode {
BRANCH_F,
BRANCH_T,
BRANCH_FL,
BRANCH_TL,
BRANCH_INVALID
};
// Mips Condition Codes
enum CondCode {
// To be used with float branch True
FCOND_F,
FCOND_UN,
FCOND_EQ,
FCOND_UEQ,
FCOND_OLT,
FCOND_ULT,
FCOND_OLE,
FCOND_ULE,
FCOND_SF,
FCOND_NGLE,
FCOND_SEQ,
FCOND_NGL,
FCOND_LT,
FCOND_NGE,
FCOND_LE,
FCOND_NGT,
// To be used with float branch False
// This conditions have the same mnemonic as the
// above ones, but are used with a branch False;
FCOND_T,
FCOND_OR,
FCOND_NEQ,
FCOND_OGL,
FCOND_UGE,
FCOND_OGE,
FCOND_UGT,
FCOND_OGT,
FCOND_ST,
FCOND_GLE,
FCOND_SNE,
FCOND_GL,
FCOND_NLT,
FCOND_GE,
FCOND_NLE,
FCOND_GT,
// Only integer conditions
COND_E,
COND_GZ,
COND_GEZ,
COND_LZ,
COND_LEZ,
COND_NE,
COND_INVALID
};
// Turn condition code into conditional branch opcode.
unsigned GetCondBranchFromCond(CondCode CC);
/// GetOppositeBranchCondition - Return the inverse of the specified cond,
/// e.g. turning COND_E to COND_NE.
CondCode GetOppositeBranchCondition(Mips::CondCode CC);
/// MipsCCToString - Map each FP condition code to its string
inline static const char *MipsFCCToString(Mips::CondCode CC)
{
switch (CC) {
default: llvm_unreachable("Unknown condition code");
case FCOND_F:
case FCOND_T: return "f";
case FCOND_UN:
case FCOND_OR: return "un";
case FCOND_EQ:
case FCOND_NEQ: return "eq";
case FCOND_UEQ:
case FCOND_OGL: return "ueq";
case FCOND_OLT:
case FCOND_UGE: return "olt";
case FCOND_ULT:
case FCOND_OGE: return "ult";
case FCOND_OLE:
case FCOND_UGT: return "ole";
case FCOND_ULE:
case FCOND_OGT: return "ule";
case FCOND_SF:
case FCOND_ST: return "sf";
case FCOND_NGLE:
case FCOND_GLE: return "ngle";
case FCOND_SEQ:
case FCOND_SNE: return "seq";
case FCOND_NGL:
case FCOND_GL: return "ngl";
case FCOND_LT:
case FCOND_NLT: return "lt";
case FCOND_NGE:
case FCOND_GE: return "ge";
case FCOND_LE:
case FCOND_NLE: return "nle";
case FCOND_NGT:
case FCOND_GT: return "gt";
}
}
}
/// MipsII - This namespace holds all of the target specific flags that
/// instruction info tracks.
///
namespace MipsII {
/// Target Operand Flag enum.
enum TOF {
//===------------------------------------------------------------------===//
// Mips Specific MachineOperand flags.
MO_NO_FLAG,
/// MO_GOT - Represents the offset into the global offset table at which
/// the address the relocation entry symbol resides during execution.
MO_GOT,
/// MO_GOT_CALL - Represents the offset into the global offset table at
/// which the address of a call site relocation entry symbol resides
/// during execution. This is different from the above since this flag
/// can only be present in call instructions.
MO_GOT_CALL,
/// MO_GPREL - Represents the offset from the current gp value to be used
/// for the relocatable object file being produced.
MO_GPREL,
/// MO_ABS_HILO - Represents the hi or low part of an absolute symbol
/// address.
MO_ABS_HILO
};
}
class MipsInstrInfo : public TargetInstrInfoImpl {
MipsTargetMachine &TM;
const MipsRegisterInfo RI;
public:
explicit MipsInstrInfo(MipsTargetMachine &TM);
/// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As
/// such, whenever a client has an instance of instruction info, it should
/// always be able to get register info as well (through this method).
///
virtual const MipsRegisterInfo &getRegisterInfo() const { return RI; }
/// Return true if the instruction is a register to register move and return
/// the source and dest operands and their sub-register indices by reference.
virtual bool isMoveInstr(const MachineInstr &MI,
unsigned &SrcReg, unsigned &DstReg,
unsigned &SrcSubIdx, unsigned &DstSubIdx) const;
/// isLoadFromStackSlot - If the specified machine instruction is a direct
/// load from a stack slot, return the virtual or physical register number of
/// the destination along with the FrameIndex of the loaded stack slot. If
/// not, return 0. This predicate must return 0 if the instruction has
/// any side effects other than loading from the stack slot.
virtual unsigned isLoadFromStackSlot(const MachineInstr *MI,
int &FrameIndex) const;
/// isStoreToStackSlot - If the specified machine instruction is a direct
/// store to a stack slot, return the virtual or physical register number of
/// the source reg along with the FrameIndex of the loaded stack slot. If
/// not, return 0. This predicate must return 0 if the instruction has
/// any side effects other than storing to the stack slot.
virtual unsigned isStoreToStackSlot(const MachineInstr *MI,
int &FrameIndex) const;
/// Branch Analysis
virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
SmallVectorImpl<MachineOperand> &Cond,
bool AllowModify) const;
virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const;
virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
MachineBasicBlock *FBB,
const SmallVectorImpl<MachineOperand> &Cond) const;
virtual bool copyRegToReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
unsigned DestReg, unsigned SrcReg,
const TargetRegisterClass *DestRC,
const TargetRegisterClass *SrcRC) const;
virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI,
unsigned SrcReg, bool isKill, int FrameIndex,
const TargetRegisterClass *RC) const;
virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI,
unsigned DestReg, int FrameIndex,
const TargetRegisterClass *RC) const;
virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
MachineInstr* MI,
const SmallVectorImpl<unsigned> &Ops,
int FrameIndex) const;
virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
MachineInstr* MI,
const SmallVectorImpl<unsigned> &Ops,
MachineInstr* LoadMI) const {
return 0;
}
virtual
bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const;
/// Insert nop instruction when hazard condition is found
virtual void insertNoop(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI) const;
/// getGlobalBaseReg - Return a virtual register initialized with the
/// the global base register value. Output instructions required to
/// initialize the register in the function entry block, if necessary.
///
unsigned getGlobalBaseReg(MachineFunction *MF) const;
};
}
#endif
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