//
//===----------------------------------------------------------------------===//
-#ifndef X86INSTRUCTIONINFO_H
-#define X86INSTRUCTIONINFO_H
+#ifndef LLVM_LIB_TARGET_X86_X86INSTRINFO_H
+#define LLVM_LIB_TARGET_X86_X86INSTRINFO_H
-#include "X86.h"
+#include "MCTargetDesc/X86BaseInfo.h"
#include "X86RegisterInfo.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/Target/TargetInstrInfo.h"
namespace llvm {
class X86RegisterInfo;
- class X86TargetMachine;
+ class X86Subtarget;
namespace X86 {
// X86 specific condition code. These correspond to X86_*_COND in
COND_O = 13,
COND_P = 14,
COND_S = 15,
+ LAST_VALID_COND = COND_S,
// Artificial condition codes. These are used by AnalyzeBranch
// to indicate a block terminated with two conditional branches to
// Turn condition code into conditional branch opcode.
unsigned GetCondBranchFromCond(CondCode CC);
+ /// \brief Return a set opcode for the given condition and whether it has
+ /// a memory operand.
+ unsigned getSETFromCond(CondCode CC, bool HasMemoryOperand = false);
+
+ /// \brief Return a cmov opcode for the given condition, register size in
+ /// bytes, and operand type.
+ unsigned getCMovFromCond(CondCode CC, unsigned RegBytes,
+ bool HasMemoryOperand = false);
+
+ // 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);
+ CondCode GetOppositeBranchCondition(CondCode CC);
} // end namespace X86;
inline static bool isLeaMem(const MachineInstr *MI, unsigned Op) {
if (MI->getOperand(Op).isFI()) return true;
- return Op+4 <= MI->getNumOperands() &&
- MI->getOperand(Op ).isReg() && isScale(MI->getOperand(Op+1)) &&
- MI->getOperand(Op+2).isReg() &&
- (MI->getOperand(Op+3).isImm() ||
- MI->getOperand(Op+3).isGlobal() ||
- MI->getOperand(Op+3).isCPI() ||
- MI->getOperand(Op+3).isJTI());
+ return Op+X86::AddrSegmentReg <= MI->getNumOperands() &&
+ MI->getOperand(Op+X86::AddrBaseReg).isReg() &&
+ isScale(MI->getOperand(Op+X86::AddrScaleAmt)) &&
+ MI->getOperand(Op+X86::AddrIndexReg).isReg() &&
+ (MI->getOperand(Op+X86::AddrDisp).isImm() ||
+ MI->getOperand(Op+X86::AddrDisp).isGlobal() ||
+ MI->getOperand(Op+X86::AddrDisp).isCPI() ||
+ MI->getOperand(Op+X86::AddrDisp).isJTI());
}
inline static bool isMem(const MachineInstr *MI, unsigned Op) {
if (MI->getOperand(Op).isFI()) return true;
- return Op+5 <= MI->getNumOperands() &&
- MI->getOperand(Op+4).isReg() &&
+ return Op+X86::AddrNumOperands <= MI->getNumOperands() &&
+ MI->getOperand(Op+X86::AddrSegmentReg).isReg() &&
isLeaMem(MI, Op);
}
-class X86InstrInfo : public X86GenInstrInfo {
- X86TargetMachine &TM;
+class X86InstrInfo final : public X86GenInstrInfo {
+ X86Subtarget &Subtarget;
const X86RegisterInfo RI;
/// RegOp2MemOpTable3Addr, RegOp2MemOpTable0, RegOp2MemOpTable1,
RegOp2MemOpTableType RegOp2MemOpTable1;
RegOp2MemOpTableType RegOp2MemOpTable2;
RegOp2MemOpTableType RegOp2MemOpTable3;
+ RegOp2MemOpTableType RegOp2MemOpTable4;
/// MemOp2RegOpTable - Load / store unfolding opcode map.
///
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);
+
+ virtual void anchor();
+
+ bool AnalyzeBranchImpl(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
+ MachineBasicBlock *&FBB,
+ SmallVectorImpl<MachineOperand> &Cond,
+ SmallVectorImpl<MachineInstr *> &CondBranches,
+ bool AllowModify) const;
public:
- explicit X86InstrInfo(X86TargetMachine &tm);
+ explicit X86InstrInfo(X86Subtarget &STI);
/// 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 X86RegisterInfo &getRegisterInfo() const { return RI; }
+ const X86RegisterInfo &getRegisterInfo() const { return RI; }
+
+ /// getSPAdjust - This returns the stack pointer adjustment made by
+ /// this instruction. For x86, we need to handle more complex call
+ /// sequences involving PUSHes.
+ int getSPAdjust(const MachineInstr *MI) const override;
/// isCoalescableExtInstr - Return true if the instruction is a "coalescable"
/// extension instruction. That is, it's like a copy where it's legal for the
/// true, then it's expected the pre-extension value is available as a subreg
/// of the result register. This also returns the sub-register index in
/// SubIdx.
- virtual bool isCoalescableExtInstr(const MachineInstr &MI,
- unsigned &SrcReg, unsigned &DstReg,
- unsigned &SubIdx) const;
+ bool isCoalescableExtInstr(const MachineInstr &MI,
+ unsigned &SrcReg, unsigned &DstReg,
+ unsigned &SubIdx) const override;
- unsigned isLoadFromStackSlot(const MachineInstr *MI, int &FrameIndex) const;
+ unsigned isLoadFromStackSlot(const MachineInstr *MI,
+ int &FrameIndex) const override;
/// isLoadFromStackSlotPostFE - Check for post-frame ptr elimination
/// stack locations as well. This uses a heuristic so it isn't
/// reliable for correctness.
unsigned isLoadFromStackSlotPostFE(const MachineInstr *MI,
- int &FrameIndex) const;
+ int &FrameIndex) const override;
- unsigned isStoreToStackSlot(const MachineInstr *MI, int &FrameIndex) const;
+ unsigned isStoreToStackSlot(const MachineInstr *MI,
+ int &FrameIndex) const override;
/// isStoreToStackSlotPostFE - Check for post-frame ptr elimination
/// stack locations as well. This uses a heuristic so it isn't
/// reliable for correctness.
unsigned isStoreToStackSlotPostFE(const MachineInstr *MI,
- int &FrameIndex) const;
+ int &FrameIndex) const override;
bool isReallyTriviallyReMaterializable(const MachineInstr *MI,
- AliasAnalysis *AA) const;
+ AliasAnalysis *AA) const override;
void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
unsigned DestReg, unsigned SubIdx,
const MachineInstr *Orig,
- const TargetRegisterInfo &TRI) const;
+ const TargetRegisterInfo &TRI) const override;
+
+ /// Given an operand within a MachineInstr, insert preceding code to put it
+ /// into the right format for a particular kind of LEA instruction. This may
+ /// involve using an appropriate super-register instead (with an implicit use
+ /// of the original) or creating a new virtual register and inserting COPY
+ /// instructions to get the data into the right class.
+ ///
+ /// Reference parameters are set to indicate how caller should add this
+ /// operand to the LEA instruction.
+ bool classifyLEAReg(MachineInstr *MI, const MachineOperand &Src,
+ unsigned LEAOpcode, bool AllowSP,
+ unsigned &NewSrc, bool &isKill,
+ bool &isUndef, MachineOperand &ImplicitOp) const;
/// convertToThreeAddress - This method must be implemented by targets that
/// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
/// This method returns a null pointer if the transformation cannot be
/// performed, otherwise it returns the new instruction.
///
- virtual MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI,
- MachineBasicBlock::iterator &MBBI,
- LiveVariables *LV) const;
-
- /// commuteInstruction - We have a few instructions that must be hacked on to
- /// commute them.
+ MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI,
+ MachineBasicBlock::iterator &MBBI,
+ LiveVariables *LV) const override;
+
+ /// Returns true iff the routine could find two commutable operands in the
+ /// given machine instruction.
+ /// The 'SrcOpIdx1' and 'SrcOpIdx2' are INPUT and OUTPUT arguments. Their
+ /// input values can be re-defined in this method only if the input values
+ /// are not pre-defined, which is designated by the special value
+ /// 'CommuteAnyOperandIndex' assigned to it.
+ /// If both of indices are pre-defined and refer to some operands, then the
+ /// method simply returns true if the corresponding operands are commutable
+ /// and returns false otherwise.
///
- virtual MachineInstr *commuteInstruction(MachineInstr *MI, bool NewMI) const;
+ /// For example, calling this method this way:
+ /// unsigned Op1 = 1, Op2 = CommuteAnyOperandIndex;
+ /// findCommutedOpIndices(MI, Op1, Op2);
+ /// can be interpreted as a query asking to find an operand that would be
+ /// commutable with the operand#1.
+ bool findCommutedOpIndices(MachineInstr *MI, unsigned &SrcOpIdx1,
+ unsigned &SrcOpIdx2) const override;
// Branch analysis.
- virtual bool isUnpredicatedTerminator(const MachineInstr* MI) const;
- 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,
- DebugLoc DL) const;
- virtual void copyPhysReg(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI, DebugLoc DL,
- unsigned DestReg, unsigned SrcReg,
- bool KillSrc) const;
- virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI,
- unsigned SrcReg, bool isKill, int FrameIndex,
- const TargetRegisterClass *RC,
- const TargetRegisterInfo *TRI) const;
-
- virtual void storeRegToAddr(MachineFunction &MF, unsigned SrcReg, bool isKill,
- SmallVectorImpl<MachineOperand> &Addr,
- const TargetRegisterClass *RC,
- MachineInstr::mmo_iterator MMOBegin,
- MachineInstr::mmo_iterator MMOEnd,
- SmallVectorImpl<MachineInstr*> &NewMIs) const;
-
- virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI,
- unsigned DestReg, int FrameIndex,
- const TargetRegisterClass *RC,
- const TargetRegisterInfo *TRI) const;
-
- virtual void loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
- SmallVectorImpl<MachineOperand> &Addr,
- const TargetRegisterClass *RC,
- MachineInstr::mmo_iterator MMOBegin,
- MachineInstr::mmo_iterator MMOEnd,
- SmallVectorImpl<MachineInstr*> &NewMIs) const;
-
- virtual bool expandPostRAPseudo(MachineBasicBlock::iterator MI) const;
-
- virtual
- MachineInstr *emitFrameIndexDebugValue(MachineFunction &MF,
- int FrameIx, uint64_t Offset,
- const MDNode *MDPtr,
- DebugLoc DL) const;
+ bool isUnpredicatedTerminator(const MachineInstr* MI) const override;
+ bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
+ MachineBasicBlock *&FBB,
+ SmallVectorImpl<MachineOperand> &Cond,
+ bool AllowModify) const override;
+
+ bool getMemOpBaseRegImmOfs(MachineInstr *LdSt, unsigned &BaseReg,
+ unsigned &Offset,
+ const TargetRegisterInfo *TRI) const override;
+ bool AnalyzeBranchPredicate(MachineBasicBlock &MBB,
+ TargetInstrInfo::MachineBranchPredicate &MBP,
+ bool AllowModify = false) const override;
+
+ unsigned RemoveBranch(MachineBasicBlock &MBB) const override;
+ unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
+ MachineBasicBlock *FBB, ArrayRef<MachineOperand> Cond,
+ DebugLoc DL) const override;
+ bool canInsertSelect(const MachineBasicBlock&, ArrayRef<MachineOperand> Cond,
+ unsigned, unsigned, int&, int&, int&) const override;
+ void insertSelect(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI, DebugLoc DL,
+ unsigned DstReg, ArrayRef<MachineOperand> Cond,
+ unsigned TrueReg, unsigned FalseReg) const override;
+ void copyPhysReg(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI, DebugLoc DL,
+ unsigned DestReg, unsigned SrcReg,
+ bool KillSrc) const override;
+ void storeRegToStackSlot(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned SrcReg, bool isKill, int FrameIndex,
+ const TargetRegisterClass *RC,
+ const TargetRegisterInfo *TRI) const override;
+
+ void storeRegToAddr(MachineFunction &MF, unsigned SrcReg, bool isKill,
+ SmallVectorImpl<MachineOperand> &Addr,
+ const TargetRegisterClass *RC,
+ MachineInstr::mmo_iterator MMOBegin,
+ MachineInstr::mmo_iterator MMOEnd,
+ SmallVectorImpl<MachineInstr*> &NewMIs) const;
+
+ void loadRegFromStackSlot(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned DestReg, int FrameIndex,
+ const TargetRegisterClass *RC,
+ const TargetRegisterInfo *TRI) const override;
+
+ void loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
+ SmallVectorImpl<MachineOperand> &Addr,
+ const TargetRegisterClass *RC,
+ MachineInstr::mmo_iterator MMOBegin,
+ MachineInstr::mmo_iterator MMOEnd,
+ SmallVectorImpl<MachineInstr*> &NewMIs) const;
+
+ bool expandPostRAPseudo(MachineBasicBlock::iterator MI) const override;
/// foldMemoryOperand - If this target supports it, fold a load or store of
/// the specified stack slot into the specified machine instruction for the
/// folding and return true, otherwise it should return false. If it folds
/// the instruction, it is likely that the MachineInstruction the iterator
/// references has been changed.
- virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
- MachineInstr* MI,
- const SmallVectorImpl<unsigned> &Ops,
- int FrameIndex) const;
+ MachineInstr *foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
+ ArrayRef<unsigned> Ops,
+ MachineBasicBlock::iterator InsertPt,
+ int FrameIndex) const override;
/// foldMemoryOperand - Same as the previous version except it allows folding
/// of any load and store from / to any address, not just from a specific
/// stack slot.
- virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
- MachineInstr* MI,
- const SmallVectorImpl<unsigned> &Ops,
- MachineInstr* LoadMI) const;
-
- /// canFoldMemoryOperand - Returns true if the specified load / store is
- /// folding is possible.
- virtual bool canFoldMemoryOperand(const MachineInstr*,
- const SmallVectorImpl<unsigned> &) const;
+ MachineInstr *foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
+ ArrayRef<unsigned> Ops,
+ MachineBasicBlock::iterator InsertPt,
+ MachineInstr *LoadMI) const override;
/// unfoldMemoryOperand - Separate a single instruction which folded a load or
/// a store or a load and a store into two or more instruction. If this is
/// possible, returns true as well as the new instructions by reference.
- virtual bool unfoldMemoryOperand(MachineFunction &MF, MachineInstr *MI,
- unsigned Reg, bool UnfoldLoad, bool UnfoldStore,
- SmallVectorImpl<MachineInstr*> &NewMIs) const;
+ bool unfoldMemoryOperand(MachineFunction &MF, MachineInstr *MI,
+ unsigned Reg, bool UnfoldLoad, bool UnfoldStore,
+ SmallVectorImpl<MachineInstr*> &NewMIs) const override;
- virtual bool unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
- SmallVectorImpl<SDNode*> &NewNodes) const;
+ bool unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
+ SmallVectorImpl<SDNode*> &NewNodes) const override;
/// getOpcodeAfterMemoryUnfold - Returns the opcode of the would be new
/// instruction after load / store are unfolded from an instruction of the
/// possible. If LoadRegIndex is non-null, it is filled in with the operand
/// index of the operand which will hold the register holding the loaded
/// value.
- virtual unsigned getOpcodeAfterMemoryUnfold(unsigned Opc,
- bool UnfoldLoad, bool UnfoldStore,
- unsigned *LoadRegIndex = 0) const;
+ unsigned getOpcodeAfterMemoryUnfold(unsigned Opc,
+ bool UnfoldLoad, bool UnfoldStore,
+ unsigned *LoadRegIndex = nullptr) const override;
/// areLoadsFromSameBasePtr - This is used by the pre-regalloc scheduler
/// to determine if two loads are loading from the same base address. It
/// should only return true if the base pointers are the same and the
/// only differences between the two addresses are the offset. It also returns
/// the offsets by reference.
- virtual bool areLoadsFromSameBasePtr(SDNode *Load1, SDNode *Load2,
- int64_t &Offset1, int64_t &Offset2) const;
+ bool areLoadsFromSameBasePtr(SDNode *Load1, SDNode *Load2, int64_t &Offset1,
+ int64_t &Offset2) const override;
/// shouldScheduleLoadsNear - This is a used by the pre-regalloc scheduler to
/// determine (in conjunction with areLoadsFromSameBasePtr) if two loads should
/// from the common base address. It returns true if it decides it's desirable
/// to schedule the two loads together. "NumLoads" is the number of loads that
/// have already been scheduled after Load1.
- virtual bool shouldScheduleLoadsNear(SDNode *Load1, SDNode *Load2,
- int64_t Offset1, int64_t Offset2,
- unsigned NumLoads) const;
+ bool shouldScheduleLoadsNear(SDNode *Load1, SDNode *Load2,
+ int64_t Offset1, int64_t Offset2,
+ unsigned NumLoads) const override;
+
+ bool shouldScheduleAdjacent(MachineInstr* First,
+ MachineInstr *Second) const override;
- virtual void getNoopForMachoTarget(MCInst &NopInst) const;
+ void getNoopForMachoTarget(MCInst &NopInst) const override;
- virtual
- bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const;
+ bool
+ ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const override;
/// isSafeToMoveRegClassDefs - Return true if it's safe to move a machine
/// instruction that defines the specified register class.
- bool isSafeToMoveRegClassDefs(const TargetRegisterClass *RC) const;
+ bool isSafeToMoveRegClassDefs(const TargetRegisterClass *RC) const override;
+
+ /// isSafeToClobberEFLAGS - Return true if it's safe insert an instruction tha
+ /// would clobber the EFLAGS condition register. Note the result may be
+ /// conservative. If it cannot definitely determine the safety after visiting
+ /// a few instructions in each direction it assumes it's not safe.
+ bool isSafeToClobberEFLAGS(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I) const;
+
+ /// True if MI has a condition code def, e.g. EFLAGS, that is
+ /// not marked dead.
+ bool hasLiveCondCodeDef(MachineInstr *MI) const;
static bool isX86_64ExtendedReg(const MachineOperand &MO) {
if (!MO.isReg()) return false;
unsigned getGlobalBaseReg(MachineFunction *MF) const;
std::pair<uint16_t, uint16_t>
- getExecutionDomain(const MachineInstr *MI) const;
+ getExecutionDomain(const MachineInstr *MI) const override;
- void setExecutionDomain(MachineInstr *MI, unsigned Domain) const;
+ void setExecutionDomain(MachineInstr *MI, unsigned Domain) const override;
- unsigned getPartialRegUpdateClearance(const MachineInstr *MI, unsigned OpNum,
- const TargetRegisterInfo *TRI) const;
+ unsigned
+ getPartialRegUpdateClearance(const MachineInstr *MI, unsigned OpNum,
+ const TargetRegisterInfo *TRI) const override;
+ unsigned getUndefRegClearance(const MachineInstr *MI, unsigned &OpNum,
+ const TargetRegisterInfo *TRI) const override;
void breakPartialRegDependency(MachineBasicBlock::iterator MI, unsigned OpNum,
- const TargetRegisterInfo *TRI) const;
+ const TargetRegisterInfo *TRI) const override;
- MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
- MachineInstr* MI,
+ MachineInstr *foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
unsigned OpNum,
- const SmallVectorImpl<MachineOperand> &MOs,
- unsigned Size, unsigned Alignment) const;
+ ArrayRef<MachineOperand> MOs,
+ MachineBasicBlock::iterator InsertPt,
+ unsigned Size, unsigned Alignment,
+ bool AllowCommute) const;
+
+ void
+ getUnconditionalBranch(MCInst &Branch,
+ const MCSymbolRefExpr *BranchTarget) const override;
+
+ void getTrap(MCInst &MI) const override;
- bool isHighLatencyDef(int opc) const;
+ unsigned getJumpInstrTableEntryBound() const override;
- bool hasHighOperandLatency(const InstrItineraryData *ItinData,
+ bool isHighLatencyDef(int opc) const override;
+
+ bool hasHighOperandLatency(const TargetSchedModel &SchedModel,
const MachineRegisterInfo *MRI,
const MachineInstr *DefMI, unsigned DefIdx,
- const MachineInstr *UseMI, unsigned UseIdx) const;
+ const MachineInstr *UseMI,
+ unsigned UseIdx) const override;
+
+ bool useMachineCombiner() const override {
+ return true;
+ }
- virtual bool OptimizeSubInstr(MachineInstr *SubInstr,
- const MachineRegisterInfo *MRI) const;
+ bool isAssociativeAndCommutative(const MachineInstr &Inst) const override;
+
+ bool hasReassociableOperands(const MachineInstr &Inst,
+ const MachineBasicBlock *MBB) const override;
+
+ void setSpecialOperandAttr(MachineInstr &OldMI1, MachineInstr &OldMI2,
+ MachineInstr &NewMI1,
+ MachineInstr &NewMI2) const override;
+
+ /// 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.
+ bool analyzeCompare(const MachineInstr *MI, unsigned &SrcReg,
+ unsigned &SrcReg2, int &CmpMask,
+ int &CmpValue) const override;
+
+ /// 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.
+ bool optimizeCompareInstr(MachineInstr *CmpInstr, unsigned SrcReg,
+ unsigned SrcReg2, int CmpMask, int CmpValue,
+ const MachineRegisterInfo *MRI) const override;
+
+ /// 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.
+ MachineInstr* optimizeLoadInstr(MachineInstr *MI,
+ const MachineRegisterInfo *MRI,
+ unsigned &FoldAsLoadDefReg,
+ MachineInstr *&DefMI) const override;
+
+ std::pair<unsigned, unsigned>
+ decomposeMachineOperandsTargetFlags(unsigned TF) const override;
+
+ ArrayRef<std::pair<unsigned, const char *>>
+ getSerializableDirectMachineOperandTargetFlags() const override;
+
+protected:
+ /// Commutes the operands in the given instruction by changing the operands
+ /// order and/or changing the instruction's opcode and/or the immediate value
+ /// operand.
+ ///
+ /// The arguments 'CommuteOpIdx1' and 'CommuteOpIdx2' specify the operands
+ /// to be commuted.
+ ///
+ /// Do not call this method for a non-commutable instruction or
+ /// non-commutable operands.
+ /// Even though the instruction is commutable, the method may still
+ /// fail to commute the operands, null pointer is returned in such cases.
+ MachineInstr *commuteInstructionImpl(MachineInstr *MI, bool NewMI,
+ unsigned CommuteOpIdx1,
+ unsigned CommuteOpIdx2) const override;
private:
MachineInstr * convertToThreeAddressWithLEA(unsigned MIOpc,
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