// Turn condition code into conditional branch opcode.
unsigned GetCondBranchFromCond(CondCode CC);
+ // Turn CMov opcode into condition code.
+ CondCode getCondFromCMovOpc(unsigned Opc);
+
/// GetOppositeBranchCondition - Return the inverse of the specified cond,
/// e.g. turning COND_E to COND_NE.
CondCode GetOppositeBranchCondition(X86::CondCode CC);
std::pair<unsigned, unsigned> > MemOp2RegOpTableType;
MemOp2RegOpTableType MemOp2RegOpTable;
- void AddTableEntry(RegOp2MemOpTableType &R2MTable,
- MemOp2RegOpTableType &M2RTable,
- unsigned RegOp, unsigned MemOp, unsigned Flags);
+ static void AddTableEntry(RegOp2MemOpTableType &R2MTable,
+ MemOp2RegOpTableType &M2RTable,
+ unsigned RegOp, unsigned MemOp, unsigned Flags);
public:
explicit X86InstrInfo(X86TargetMachine &tm);
MachineBasicBlock *FBB,
const SmallVectorImpl<MachineOperand> &Cond,
DebugLoc DL) const;
+ virtual bool canInsertSelect(const MachineBasicBlock&,
+ const SmallVectorImpl<MachineOperand> &Cond,
+ unsigned, unsigned, int&, int&, int&) const;
+ virtual void insertSelect(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI, DebugLoc DL,
+ unsigned DstReg,
+ const SmallVectorImpl<MachineOperand> &Cond,
+ unsigned TrueReg, unsigned FalseReg) const;
virtual void copyPhysReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI, DebugLoc DL,
unsigned DestReg, unsigned SrcReg,
const MachineInstr *DefMI, unsigned DefIdx,
const MachineInstr *UseMI, unsigned UseIdx) const;
+ /// analyzeCompare - For a comparison instruction, return the source registers
+ /// in SrcReg and SrcReg2 if having two register operands, and the value it
+ /// compares against in CmpValue. Return true if the comparison instruction
+ /// can be analyzed.
+ virtual bool analyzeCompare(const MachineInstr *MI, unsigned &SrcReg,
+ unsigned &SrcReg2,
+ int &CmpMask, int &CmpValue) const;
+
+ /// optimizeCompareInstr - Check if there exists an earlier instruction that
+ /// operates on the same source operands and sets flags in the same way as
+ /// Compare; remove Compare if possible.
+ virtual bool optimizeCompareInstr(MachineInstr *CmpInstr, unsigned SrcReg,
+ unsigned SrcReg2, int CmpMask, int CmpValue,
+ const MachineRegisterInfo *MRI) const;
+
+ /// optimizeLoadInstr - Try to remove the load by folding it to a register
+ /// operand at the use. We fold the load instructions if and only if the
+ /// def and use are in the same BB. We only look at one load and see
+ /// whether it can be folded into MI. FoldAsLoadDefReg is the virtual register
+ /// defined by the load we are trying to fold. DefMI returns the machine
+ /// instruction that defines FoldAsLoadDefReg, and the function returns
+ /// the machine instruction generated due to folding.
+ virtual MachineInstr* optimizeLoadInstr(MachineInstr *MI,
+ const MachineRegisterInfo *MRI,
+ unsigned &FoldAsLoadDefReg,
+ MachineInstr *&DefMI) const;
+
private:
MachineInstr * convertToThreeAddressWithLEA(unsigned MIOpc,
MachineFunction::iterator &MFI,