//
// 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 file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#define X86INSTRUCTIONINFO_H
#include "llvm/Target/TargetInstrInfo.h"
+#include "X86.h"
#include "X86RegisterInfo.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/Target/TargetRegisterInfo.h"
namespace llvm {
class X86RegisterInfo;
COND_O = 13,
COND_P = 14,
COND_S = 15,
+
+ // Artificial condition codes. These are used by AnalyzeBranch
+ // to indicate a block terminated with two conditional branches to
+ // the same location. This occurs in code using FCMP_OEQ or FCMP_UNE,
+ // which can't be represented on x86 with a single condition. These
+ // are never used in MachineInstrs.
+ COND_NE_OR_P,
+ COND_NP_OR_E,
+
COND_INVALID
};
-
+
// Turn condition code into conditional branch opcode.
unsigned GetCondBranchFromCond(CondCode CC);
// SpecialFP - Special instruction forms. Dispatch by opcode explicitly.
SpecialFP = 7 << FPTypeShift,
- // Bits 19 -> 23 are unused
+ // Lock prefix
+ LOCKShift = 19,
+ LOCK = 1 << LOCKShift,
+
+ // Segment override prefixes. Currently we just need ability to address
+ // stuff in gs and fs segments.
+ SegOvrShift = 20,
+ SegOvrMask = 3 << SegOvrShift,
+ FS = 1 << SegOvrShift,
+ GS = 2 << SegOvrShift,
+
+ // Bits 22 -> 23 are unused
OpcodeShift = 24,
OpcodeMask = 0xFF << OpcodeShift
};
}
-class X86InstrInfo : public TargetInstrInfo {
+inline static bool isScale(const MachineOperand &MO) {
+ return MO.isImm() &&
+ (MO.getImm() == 1 || MO.getImm() == 2 ||
+ MO.getImm() == 4 || MO.getImm() == 8);
+}
+
+inline static bool isMem(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());
+}
+
+class X86InstrInfo : public TargetInstrInfoImpl {
X86TargetMachine &TM;
const X86RegisterInfo RI;
+
+ /// RegOp2MemOpTable2Addr, RegOp2MemOpTable0, RegOp2MemOpTable1,
+ /// RegOp2MemOpTable2 - Load / store folding opcode maps.
+ ///
+ DenseMap<unsigned*, unsigned> RegOp2MemOpTable2Addr;
+ DenseMap<unsigned*, unsigned> RegOp2MemOpTable0;
+ DenseMap<unsigned*, unsigned> RegOp2MemOpTable1;
+ DenseMap<unsigned*, unsigned> RegOp2MemOpTable2;
+
+ /// MemOp2RegOpTable - Load / store unfolding opcode map.
+ ///
+ DenseMap<unsigned*, std::pair<unsigned, unsigned> > MemOp2RegOpTable;
+
public:
- X86InstrInfo(X86TargetMachine &tm);
+ explicit X86InstrInfo(X86TargetMachine &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 MRegisterInfo &getRegisterInfo() const { return RI; }
+ virtual const X86RegisterInfo &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;
+
+ unsigned isLoadFromStackSlot(const MachineInstr *MI, int &FrameIndex) const;
+ unsigned isStoreToStackSlot(const MachineInstr *MI, int &FrameIndex) const;
+
+ bool isReallyTriviallyReMaterializable(const MachineInstr *MI) const;
+ void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
+ unsigned DestReg, const MachineInstr *Orig) const;
+
+ bool isInvariantLoad(const MachineInstr *MI) const;
- // Return true if the instruction is a register to register move and
- // leave the source and dest operands in the passed parameters.
- //
- bool isMoveInstr(const MachineInstr& MI, unsigned& sourceReg,
- unsigned& destReg) const;
- unsigned isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const;
- unsigned isStoreToStackSlot(MachineInstr *MI, int &FrameIndex) const;
- bool isOtherReMaterializableLoad(MachineInstr *MI) 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
/// may be able to convert a two-address instruction into a true
///
virtual MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI,
MachineBasicBlock::iterator &MBBI,
- LiveVariables &LV) const;
+ LiveVariables *LV) const;
/// commuteInstruction - We have a few instructions that must be hacked on to
/// commute them.
///
- virtual MachineInstr *commuteInstruction(MachineInstr *MI) const;
+ virtual MachineInstr *commuteInstruction(MachineInstr *MI, bool NewMI) const;
// Branch analysis.
virtual bool isUnpredicatedTerminator(const MachineInstr* MI) const;
virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
- std::vector<MachineOperand> &Cond) const;
+ SmallVectorImpl<MachineOperand> &Cond) const;
virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const;
virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
MachineBasicBlock *FBB,
- const std::vector<MachineOperand> &Cond) const;
- virtual bool BlockHasNoFallThrough(MachineBasicBlock &MBB) const;
- virtual bool ReverseBranchCondition(std::vector<MachineOperand> &Cond) const;
+ const SmallVectorImpl<MachineOperand> &Cond) const;
+ virtual bool copyRegToReg(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned DestReg, unsigned SrcReg,
+ const TargetRegisterClass *DestRC,
+ const TargetRegisterClass *SrcRC) const;
+ virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned SrcReg, bool isKill, int FrameIndex,
+ const TargetRegisterClass *RC) const;
+
+ virtual void storeRegToAddr(MachineFunction &MF, unsigned SrcReg, bool isKill,
+ SmallVectorImpl<MachineOperand> &Addr,
+ const TargetRegisterClass *RC,
+ SmallVectorImpl<MachineInstr*> &NewMIs) const;
+
+ virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ unsigned DestReg, int FrameIndex,
+ const TargetRegisterClass *RC) const;
+
+ virtual void loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
+ SmallVectorImpl<MachineOperand> &Addr,
+ const TargetRegisterClass *RC,
+ SmallVectorImpl<MachineInstr*> &NewMIs) const;
+
+ virtual bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ const std::vector<CalleeSavedInfo> &CSI) const;
+
+ virtual bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ const std::vector<CalleeSavedInfo> &CSI) const;
+
+ /// foldMemoryOperand - If this target supports it, fold a load or store of
+ /// the specified stack slot into the specified machine instruction for the
+ /// specified operand(s). If this is possible, the target should perform 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;
+
+ /// 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;
+
+ /// 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;
+
+ virtual bool unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
+ SmallVectorImpl<SDNode*> &NewNodes) const;
+
+ /// getOpcodeAfterMemoryUnfold - Returns the opcode of the would be new
+ /// instruction after load / store are unfolded from an instruction of the
+ /// specified opcode. It returns zero if the specified unfolding is not
+ /// possible.
+ virtual unsigned getOpcodeAfterMemoryUnfold(unsigned Opc,
+ bool UnfoldLoad, bool UnfoldStore) const;
+
+ virtual bool BlockHasNoFallThrough(const MachineBasicBlock &MBB) const;
+ virtual
+ bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const;
+
+ /// IgnoreRegisterClassBarriers - Returns true if pre-register allocation
+ /// live interval splitting pass should ignore barriers of the specified
+ /// register class.
+ bool IgnoreRegisterClassBarriers(const TargetRegisterClass *RC) const;
const TargetRegisterClass *getPointerRegClass() const;
// getBaseOpcodeFor - This function returns the "base" X86 opcode for the
- // specified opcode number.
+ // specified machine instruction.
//
- unsigned char getBaseOpcodeFor(const TargetInstrDescriptor *TID) const {
+ unsigned char getBaseOpcodeFor(const TargetInstrDesc *TID) const {
return TID->TSFlags >> X86II::OpcodeShift;
}
+ unsigned char getBaseOpcodeFor(unsigned Opcode) const {
+ return getBaseOpcodeFor(&get(Opcode));
+ }
+
+ static bool isX86_64NonExtLowByteReg(unsigned reg) {
+ return (reg == X86::SPL || reg == X86::BPL ||
+ reg == X86::SIL || reg == X86::DIL);
+ }
+
+ static unsigned sizeOfImm(const TargetInstrDesc *Desc);
+ static bool isX86_64ExtendedReg(const MachineOperand &MO);
+ static unsigned determineREX(const MachineInstr &MI);
+
+ /// GetInstSize - Returns the size of the specified MachineInstr.
+ ///
+ virtual unsigned GetInstSizeInBytes(const MachineInstr *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;
+
+private:
+ MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
+ MachineInstr* MI,
+ unsigned OpNum,
+ const SmallVectorImpl<MachineOperand> &MOs) const;
};
} // End llvm namespace