1 //===-- X86InstrInfo.h - X86 Instruction Information ------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the X86 implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_LIB_TARGET_X86_X86INSTRINFO_H
15 #define LLVM_LIB_TARGET_X86_X86INSTRINFO_H
17 #include "MCTargetDesc/X86BaseInfo.h"
18 #include "X86InstrFMA3Info.h"
19 #include "X86RegisterInfo.h"
20 #include "llvm/ADT/DenseMap.h"
21 #include "llvm/CodeGen/TargetInstrInfo.h"
23 #define GET_INSTRINFO_HEADER
24 #include "X86GenInstrInfo.inc"
27 class MachineInstrBuilder;
28 class X86RegisterInfo;
32 // X86 specific condition code. These correspond to X86_*_COND in
33 // X86InstrInfo.td. They must be kept in synch.
51 LAST_VALID_COND = COND_S,
53 // Artificial condition codes. These are used by AnalyzeBranch
54 // to indicate a block terminated with two conditional branches that together
55 // form a compound condition. They occur in code using FCMP_OEQ or FCMP_UNE,
56 // which can't be represented on x86 with a single condition. These
57 // are never used in MachineInstrs and are inverses of one another.
64 // Turn condition code into conditional branch opcode.
65 unsigned GetCondBranchFromCond(CondCode CC);
67 /// \brief Return a pair of condition code for the given predicate and whether
68 /// the instruction operands should be swaped to match the condition code.
69 std::pair<CondCode, bool> getX86ConditionCode(CmpInst::Predicate Predicate);
71 /// \brief Return a set opcode for the given condition and whether it has
73 unsigned getSETFromCond(CondCode CC, bool HasMemoryOperand = false);
75 /// \brief Return a cmov opcode for the given condition, register size in
76 /// bytes, and operand type.
77 unsigned getCMovFromCond(CondCode CC, unsigned RegBytes,
78 bool HasMemoryOperand = false);
80 // Turn CMov opcode into condition code.
81 CondCode getCondFromCMovOpc(unsigned Opc);
83 /// GetOppositeBranchCondition - Return the inverse of the specified cond,
84 /// e.g. turning COND_E to COND_NE.
85 CondCode GetOppositeBranchCondition(CondCode CC);
88 /// isGlobalStubReference - Return true if the specified TargetFlag operand is
89 /// a reference to a stub for a global, not the global itself.
90 inline static bool isGlobalStubReference(unsigned char TargetFlag) {
92 case X86II::MO_DLLIMPORT: // dllimport stub.
93 case X86II::MO_GOTPCREL: // rip-relative GOT reference.
94 case X86II::MO_GOT: // normal GOT reference.
95 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: // Normal $non_lazy_ptr ref.
96 case X86II::MO_DARWIN_NONLAZY: // Normal $non_lazy_ptr ref.
103 /// isGlobalRelativeToPICBase - Return true if the specified global value
104 /// reference is relative to a 32-bit PIC base (X86ISD::GlobalBaseReg). If this
105 /// is true, the addressing mode has the PIC base register added in (e.g. EBX).
106 inline static bool isGlobalRelativeToPICBase(unsigned char TargetFlag) {
107 switch (TargetFlag) {
108 case X86II::MO_GOTOFF: // isPICStyleGOT: local global.
109 case X86II::MO_GOT: // isPICStyleGOT: other global.
110 case X86II::MO_PIC_BASE_OFFSET: // Darwin local global.
111 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: // Darwin/32 external global.
112 case X86II::MO_TLVP: // ??? Pretty sure..
119 inline static bool isScale(const MachineOperand &MO) {
120 return MO.isImm() && (MO.getImm() == 1 || MO.getImm() == 2 ||
121 MO.getImm() == 4 || MO.getImm() == 8);
124 inline static bool isLeaMem(const MachineInstr &MI, unsigned Op) {
125 if (MI.getOperand(Op).isFI())
127 return Op + X86::AddrSegmentReg <= MI.getNumOperands() &&
128 MI.getOperand(Op + X86::AddrBaseReg).isReg() &&
129 isScale(MI.getOperand(Op + X86::AddrScaleAmt)) &&
130 MI.getOperand(Op + X86::AddrIndexReg).isReg() &&
131 (MI.getOperand(Op + X86::AddrDisp).isImm() ||
132 MI.getOperand(Op + X86::AddrDisp).isGlobal() ||
133 MI.getOperand(Op + X86::AddrDisp).isCPI() ||
134 MI.getOperand(Op + X86::AddrDisp).isJTI());
137 inline static bool isMem(const MachineInstr &MI, unsigned Op) {
138 if (MI.getOperand(Op).isFI())
140 return Op + X86::AddrNumOperands <= MI.getNumOperands() &&
141 MI.getOperand(Op + X86::AddrSegmentReg).isReg() && isLeaMem(MI, Op);
144 class X86InstrInfo final : public X86GenInstrInfo {
145 X86Subtarget &Subtarget;
146 const X86RegisterInfo RI;
148 /// RegOp2MemOpTable3Addr, RegOp2MemOpTable0, RegOp2MemOpTable1,
149 /// RegOp2MemOpTable2, RegOp2MemOpTable3 - Load / store folding opcode maps.
151 typedef DenseMap<unsigned, std::pair<uint16_t, uint16_t>>
152 RegOp2MemOpTableType;
153 RegOp2MemOpTableType RegOp2MemOpTable2Addr;
154 RegOp2MemOpTableType RegOp2MemOpTable0;
155 RegOp2MemOpTableType RegOp2MemOpTable1;
156 RegOp2MemOpTableType RegOp2MemOpTable2;
157 RegOp2MemOpTableType RegOp2MemOpTable3;
158 RegOp2MemOpTableType RegOp2MemOpTable4;
160 /// MemOp2RegOpTable - Load / store unfolding opcode map.
162 typedef DenseMap<unsigned, std::pair<uint16_t, uint16_t>>
163 MemOp2RegOpTableType;
164 MemOp2RegOpTableType MemOp2RegOpTable;
166 static void AddTableEntry(RegOp2MemOpTableType &R2MTable,
167 MemOp2RegOpTableType &M2RTable, uint16_t RegOp,
168 uint16_t MemOp, uint16_t Flags);
170 virtual void anchor();
172 bool AnalyzeBranchImpl(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
173 MachineBasicBlock *&FBB,
174 SmallVectorImpl<MachineOperand> &Cond,
175 SmallVectorImpl<MachineInstr *> &CondBranches,
176 bool AllowModify) const;
179 explicit X86InstrInfo(X86Subtarget &STI);
181 /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As
182 /// such, whenever a client has an instance of instruction info, it should
183 /// always be able to get register info as well (through this method).
185 const X86RegisterInfo &getRegisterInfo() const { return RI; }
187 /// Returns the stack pointer adjustment that happens inside the frame
188 /// setup..destroy sequence (e.g. by pushes, or inside the callee).
189 int64_t getFrameAdjustment(const MachineInstr &I) const {
190 assert(isFrameInstr(I));
192 return I.getOperand(2).getImm();
193 return I.getOperand(1).getImm();
196 /// Sets the stack pointer adjustment made inside the frame made up by this
198 void setFrameAdjustment(MachineInstr &I, int64_t V) const {
199 assert(isFrameInstr(I));
201 I.getOperand(2).setImm(V);
203 I.getOperand(1).setImm(V);
206 /// getSPAdjust - This returns the stack pointer adjustment made by
207 /// this instruction. For x86, we need to handle more complex call
208 /// sequences involving PUSHes.
209 int getSPAdjust(const MachineInstr &MI) const override;
211 /// isCoalescableExtInstr - Return true if the instruction is a "coalescable"
212 /// extension instruction. That is, it's like a copy where it's legal for the
213 /// source to overlap the destination. e.g. X86::MOVSX64rr32. If this returns
214 /// true, then it's expected the pre-extension value is available as a subreg
215 /// of the result register. This also returns the sub-register index in
217 bool isCoalescableExtInstr(const MachineInstr &MI, unsigned &SrcReg,
218 unsigned &DstReg, unsigned &SubIdx) const override;
220 unsigned isLoadFromStackSlot(const MachineInstr &MI,
221 int &FrameIndex) const override;
222 /// isLoadFromStackSlotPostFE - Check for post-frame ptr elimination
223 /// stack locations as well. This uses a heuristic so it isn't
224 /// reliable for correctness.
225 unsigned isLoadFromStackSlotPostFE(const MachineInstr &MI,
226 int &FrameIndex) const override;
228 unsigned isStoreToStackSlot(const MachineInstr &MI,
229 int &FrameIndex) const override;
230 /// isStoreToStackSlotPostFE - Check for post-frame ptr elimination
231 /// stack locations as well. This uses a heuristic so it isn't
232 /// reliable for correctness.
233 unsigned isStoreToStackSlotPostFE(const MachineInstr &MI,
234 int &FrameIndex) const override;
236 bool isReallyTriviallyReMaterializable(const MachineInstr &MI,
237 AliasAnalysis *AA) const override;
238 void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
239 unsigned DestReg, unsigned SubIdx,
240 const MachineInstr &Orig,
241 const TargetRegisterInfo &TRI) const override;
243 /// Given an operand within a MachineInstr, insert preceding code to put it
244 /// into the right format for a particular kind of LEA instruction. This may
245 /// involve using an appropriate super-register instead (with an implicit use
246 /// of the original) or creating a new virtual register and inserting COPY
247 /// instructions to get the data into the right class.
249 /// Reference parameters are set to indicate how caller should add this
250 /// operand to the LEA instruction.
251 bool classifyLEAReg(MachineInstr &MI, const MachineOperand &Src,
252 unsigned LEAOpcode, bool AllowSP, unsigned &NewSrc,
253 bool &isKill, bool &isUndef, MachineOperand &ImplicitOp,
254 LiveVariables *LV) const;
256 /// convertToThreeAddress - This method must be implemented by targets that
257 /// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
258 /// may be able to convert a two-address instruction into a true
259 /// three-address instruction on demand. This allows the X86 target (for
260 /// example) to convert ADD and SHL instructions into LEA instructions if they
261 /// would require register copies due to two-addressness.
263 /// This method returns a null pointer if the transformation cannot be
264 /// performed, otherwise it returns the new instruction.
266 MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI,
268 LiveVariables *LV) const override;
270 /// Returns true iff the routine could find two commutable operands in the
271 /// given machine instruction.
272 /// The 'SrcOpIdx1' and 'SrcOpIdx2' are INPUT and OUTPUT arguments. Their
273 /// input values can be re-defined in this method only if the input values
274 /// are not pre-defined, which is designated by the special value
275 /// 'CommuteAnyOperandIndex' assigned to it.
276 /// If both of indices are pre-defined and refer to some operands, then the
277 /// method simply returns true if the corresponding operands are commutable
278 /// and returns false otherwise.
280 /// For example, calling this method this way:
281 /// unsigned Op1 = 1, Op2 = CommuteAnyOperandIndex;
282 /// findCommutedOpIndices(MI, Op1, Op2);
283 /// can be interpreted as a query asking to find an operand that would be
284 /// commutable with the operand#1.
285 bool findCommutedOpIndices(MachineInstr &MI, unsigned &SrcOpIdx1,
286 unsigned &SrcOpIdx2) const override;
288 /// Returns true if the routine could find two commutable operands
289 /// in the given FMA instruction \p MI. Otherwise, returns false.
291 /// \p SrcOpIdx1 and \p SrcOpIdx2 are INPUT and OUTPUT arguments.
292 /// The output indices of the commuted operands are returned in these
293 /// arguments. Also, the input values of these arguments may be preset either
294 /// to indices of operands that must be commuted or be equal to a special
295 /// value 'CommuteAnyOperandIndex' which means that the corresponding
296 /// operand index is not set and this method is free to pick any of
297 /// available commutable operands.
298 /// The parameter \p FMA3Group keeps the reference to the group of relative
299 /// FMA3 opcodes including register/memory forms of 132/213/231 opcodes.
301 /// For example, calling this method this way:
302 /// unsigned Idx1 = 1, Idx2 = CommuteAnyOperandIndex;
303 /// findFMA3CommutedOpIndices(MI, Idx1, Idx2, FMA3Group);
304 /// can be interpreted as a query asking if the operand #1 can be swapped
305 /// with any other available operand (e.g. operand #2, operand #3, etc.).
307 /// The returned FMA opcode may differ from the opcode in the given MI.
308 /// For example, commuting the operands #1 and #3 in the following FMA
309 /// FMA213 #1, #2, #3
310 /// results into instruction with adjusted opcode:
311 /// FMA231 #3, #2, #1
312 bool findFMA3CommutedOpIndices(const MachineInstr &MI, unsigned &SrcOpIdx1,
314 const X86InstrFMA3Group &FMA3Group) const;
316 /// Returns an adjusted FMA opcode that must be used in FMA instruction that
317 /// performs the same computations as the given \p MI but which has the
318 /// operands \p SrcOpIdx1 and \p SrcOpIdx2 commuted.
319 /// It may return 0 if it is unsafe to commute the operands.
320 /// Note that a machine instruction (instead of its opcode) is passed as the
321 /// first parameter to make it possible to analyze the instruction's uses and
322 /// commute the first operand of FMA even when it seems unsafe when you look
323 /// at the opcode. For example, it is Ok to commute the first operand of
324 /// VFMADD*SD_Int, if ONLY the lowest 64-bit element of the result is used.
326 /// The returned FMA opcode may differ from the opcode in the given \p MI.
327 /// For example, commuting the operands #1 and #3 in the following FMA
328 /// FMA213 #1, #2, #3
329 /// results into instruction with adjusted opcode:
330 /// FMA231 #3, #2, #1
332 getFMA3OpcodeToCommuteOperands(const MachineInstr &MI, unsigned SrcOpIdx1,
334 const X86InstrFMA3Group &FMA3Group) const;
337 bool isUnpredicatedTerminator(const MachineInstr &MI) const override;
338 bool isUnconditionalTailCall(const MachineInstr &MI) const override;
339 bool canMakeTailCallConditional(SmallVectorImpl<MachineOperand> &Cond,
340 const MachineInstr &TailCall) const override;
341 void replaceBranchWithTailCall(MachineBasicBlock &MBB,
342 SmallVectorImpl<MachineOperand> &Cond,
343 const MachineInstr &TailCall) const override;
345 bool analyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
346 MachineBasicBlock *&FBB,
347 SmallVectorImpl<MachineOperand> &Cond,
348 bool AllowModify) const override;
350 bool getMemOpBaseRegImmOfs(MachineInstr &LdSt, unsigned &BaseReg,
352 const TargetRegisterInfo *TRI) const override;
353 bool analyzeBranchPredicate(MachineBasicBlock &MBB,
354 TargetInstrInfo::MachineBranchPredicate &MBP,
355 bool AllowModify = false) const override;
357 unsigned removeBranch(MachineBasicBlock &MBB,
358 int *BytesRemoved = nullptr) const override;
359 unsigned insertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
360 MachineBasicBlock *FBB, ArrayRef<MachineOperand> Cond,
362 int *BytesAdded = nullptr) const override;
363 bool canInsertSelect(const MachineBasicBlock &, ArrayRef<MachineOperand> Cond,
364 unsigned, unsigned, int &, int &, int &) const override;
365 void insertSelect(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
366 const DebugLoc &DL, unsigned DstReg,
367 ArrayRef<MachineOperand> Cond, unsigned TrueReg,
368 unsigned FalseReg) const override;
369 void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
370 const DebugLoc &DL, unsigned DestReg, unsigned SrcReg,
371 bool KillSrc) const override;
372 void storeRegToStackSlot(MachineBasicBlock &MBB,
373 MachineBasicBlock::iterator MI, unsigned SrcReg,
374 bool isKill, int FrameIndex,
375 const TargetRegisterClass *RC,
376 const TargetRegisterInfo *TRI) const override;
378 void storeRegToAddr(MachineFunction &MF, unsigned SrcReg, bool isKill,
379 SmallVectorImpl<MachineOperand> &Addr,
380 const TargetRegisterClass *RC,
381 MachineInstr::mmo_iterator MMOBegin,
382 MachineInstr::mmo_iterator MMOEnd,
383 SmallVectorImpl<MachineInstr *> &NewMIs) const;
385 void loadRegFromStackSlot(MachineBasicBlock &MBB,
386 MachineBasicBlock::iterator MI, unsigned DestReg,
387 int FrameIndex, const TargetRegisterClass *RC,
388 const TargetRegisterInfo *TRI) const override;
390 void loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
391 SmallVectorImpl<MachineOperand> &Addr,
392 const TargetRegisterClass *RC,
393 MachineInstr::mmo_iterator MMOBegin,
394 MachineInstr::mmo_iterator MMOEnd,
395 SmallVectorImpl<MachineInstr *> &NewMIs) const;
397 bool expandPostRAPseudo(MachineInstr &MI) const override;
399 /// Check whether the target can fold a load that feeds a subreg operand
400 /// (or a subreg operand that feeds a store).
401 bool isSubregFoldable() const override { return true; }
403 /// foldMemoryOperand - If this target supports it, fold a load or store of
404 /// the specified stack slot into the specified machine instruction for the
405 /// specified operand(s). If this is possible, the target should perform the
406 /// folding and return true, otherwise it should return false. If it folds
407 /// the instruction, it is likely that the MachineInstruction the iterator
408 /// references has been changed.
410 foldMemoryOperandImpl(MachineFunction &MF, MachineInstr &MI,
411 ArrayRef<unsigned> Ops,
412 MachineBasicBlock::iterator InsertPt, int FrameIndex,
413 LiveIntervals *LIS = nullptr) const override;
415 /// foldMemoryOperand - Same as the previous version except it allows folding
416 /// of any load and store from / to any address, not just from a specific
418 MachineInstr *foldMemoryOperandImpl(
419 MachineFunction &MF, MachineInstr &MI, ArrayRef<unsigned> Ops,
420 MachineBasicBlock::iterator InsertPt, MachineInstr &LoadMI,
421 LiveIntervals *LIS = nullptr) const override;
423 /// unfoldMemoryOperand - Separate a single instruction which folded a load or
424 /// a store or a load and a store into two or more instruction. If this is
425 /// possible, returns true as well as the new instructions by reference.
427 unfoldMemoryOperand(MachineFunction &MF, MachineInstr &MI, unsigned Reg,
428 bool UnfoldLoad, bool UnfoldStore,
429 SmallVectorImpl<MachineInstr *> &NewMIs) const override;
431 bool unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
432 SmallVectorImpl<SDNode *> &NewNodes) const override;
434 /// getOpcodeAfterMemoryUnfold - Returns the opcode of the would be new
435 /// instruction after load / store are unfolded from an instruction of the
436 /// specified opcode. It returns zero if the specified unfolding is not
437 /// possible. If LoadRegIndex is non-null, it is filled in with the operand
438 /// index of the operand which will hold the register holding the loaded
441 getOpcodeAfterMemoryUnfold(unsigned Opc, bool UnfoldLoad, bool UnfoldStore,
442 unsigned *LoadRegIndex = nullptr) const override;
444 /// areLoadsFromSameBasePtr - This is used by the pre-regalloc scheduler
445 /// to determine if two loads are loading from the same base address. It
446 /// should only return true if the base pointers are the same and the
447 /// only differences between the two addresses are the offset. It also returns
448 /// the offsets by reference.
449 bool areLoadsFromSameBasePtr(SDNode *Load1, SDNode *Load2, int64_t &Offset1,
450 int64_t &Offset2) const override;
452 /// shouldScheduleLoadsNear - This is a used by the pre-regalloc scheduler to
453 /// determine (in conjunction with areLoadsFromSameBasePtr) if two loads
454 /// should be scheduled togther. On some targets if two loads are loading from
455 /// addresses in the same cache line, it's better if they are scheduled
456 /// together. This function takes two integers that represent the load offsets
457 /// from the common base address. It returns true if it decides it's desirable
458 /// to schedule the two loads together. "NumLoads" is the number of loads that
459 /// have already been scheduled after Load1.
460 bool shouldScheduleLoadsNear(SDNode *Load1, SDNode *Load2, int64_t Offset1,
462 unsigned NumLoads) const override;
464 void getNoop(MCInst &NopInst) const override;
467 reverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const override;
469 /// isSafeToMoveRegClassDefs - Return true if it's safe to move a machine
470 /// instruction that defines the specified register class.
471 bool isSafeToMoveRegClassDefs(const TargetRegisterClass *RC) const override;
473 /// isSafeToClobberEFLAGS - Return true if it's safe insert an instruction tha
474 /// would clobber the EFLAGS condition register. Note the result may be
475 /// conservative. If it cannot definitely determine the safety after visiting
476 /// a few instructions in each direction it assumes it's not safe.
477 bool isSafeToClobberEFLAGS(MachineBasicBlock &MBB,
478 MachineBasicBlock::iterator I) const;
480 /// True if MI has a condition code def, e.g. EFLAGS, that is
482 bool hasLiveCondCodeDef(MachineInstr &MI) const;
484 /// getGlobalBaseReg - Return a virtual register initialized with the
485 /// the global base register value. Output instructions required to
486 /// initialize the register in the function entry block, if necessary.
488 unsigned getGlobalBaseReg(MachineFunction *MF) const;
490 std::pair<uint16_t, uint16_t>
491 getExecutionDomain(const MachineInstr &MI) const override;
493 void setExecutionDomain(MachineInstr &MI, unsigned Domain) const override;
496 getPartialRegUpdateClearance(const MachineInstr &MI, unsigned OpNum,
497 const TargetRegisterInfo *TRI) const override;
498 unsigned getUndefRegClearance(const MachineInstr &MI, unsigned &OpNum,
499 const TargetRegisterInfo *TRI) const override;
500 void breakPartialRegDependency(MachineInstr &MI, unsigned OpNum,
501 const TargetRegisterInfo *TRI) const override;
503 MachineInstr *foldMemoryOperandImpl(MachineFunction &MF, MachineInstr &MI,
505 ArrayRef<MachineOperand> MOs,
506 MachineBasicBlock::iterator InsertPt,
507 unsigned Size, unsigned Alignment,
508 bool AllowCommute) const;
510 bool isHighLatencyDef(int opc) const override;
512 bool hasHighOperandLatency(const TargetSchedModel &SchedModel,
513 const MachineRegisterInfo *MRI,
514 const MachineInstr &DefMI, unsigned DefIdx,
515 const MachineInstr &UseMI,
516 unsigned UseIdx) const override;
518 bool useMachineCombiner() const override { return true; }
520 bool isAssociativeAndCommutative(const MachineInstr &Inst) const override;
522 bool hasReassociableOperands(const MachineInstr &Inst,
523 const MachineBasicBlock *MBB) const override;
525 void setSpecialOperandAttr(MachineInstr &OldMI1, MachineInstr &OldMI2,
526 MachineInstr &NewMI1,
527 MachineInstr &NewMI2) const override;
529 /// analyzeCompare - For a comparison instruction, return the source registers
530 /// in SrcReg and SrcReg2 if having two register operands, and the value it
531 /// compares against in CmpValue. Return true if the comparison instruction
533 bool analyzeCompare(const MachineInstr &MI, unsigned &SrcReg,
534 unsigned &SrcReg2, int &CmpMask,
535 int &CmpValue) const override;
537 /// optimizeCompareInstr - Check if there exists an earlier instruction that
538 /// operates on the same source operands and sets flags in the same way as
539 /// Compare; remove Compare if possible.
540 bool optimizeCompareInstr(MachineInstr &CmpInstr, unsigned SrcReg,
541 unsigned SrcReg2, int CmpMask, int CmpValue,
542 const MachineRegisterInfo *MRI) const override;
544 /// optimizeLoadInstr - Try to remove the load by folding it to a register
545 /// operand at the use. We fold the load instructions if and only if the
546 /// def and use are in the same BB. We only look at one load and see
547 /// whether it can be folded into MI. FoldAsLoadDefReg is the virtual register
548 /// defined by the load we are trying to fold. DefMI returns the machine
549 /// instruction that defines FoldAsLoadDefReg, and the function returns
550 /// the machine instruction generated due to folding.
551 MachineInstr *optimizeLoadInstr(MachineInstr &MI,
552 const MachineRegisterInfo *MRI,
553 unsigned &FoldAsLoadDefReg,
554 MachineInstr *&DefMI) const override;
556 std::pair<unsigned, unsigned>
557 decomposeMachineOperandsTargetFlags(unsigned TF) const override;
559 ArrayRef<std::pair<unsigned, const char *>>
560 getSerializableDirectMachineOperandTargetFlags() const override;
562 virtual MachineOutlinerInfo getOutlininingCandidateInfo(
564 std::pair<MachineBasicBlock::iterator, MachineBasicBlock::iterator>>
565 &RepeatedSequenceLocs) const override;
567 bool isFunctionSafeToOutlineFrom(MachineFunction &MF,
568 bool OutlineFromLinkOnceODRs) const override;
570 llvm::X86GenInstrInfo::MachineOutlinerInstrType
571 getOutliningType(MachineInstr &MI) const override;
573 void insertOutlinerEpilogue(MachineBasicBlock &MBB, MachineFunction &MF,
574 const MachineOutlinerInfo &MInfo) const override;
576 void insertOutlinerPrologue(MachineBasicBlock &MBB, MachineFunction &MF,
577 const MachineOutlinerInfo &MInfo) const override;
579 MachineBasicBlock::iterator
580 insertOutlinedCall(Module &M, MachineBasicBlock &MBB,
581 MachineBasicBlock::iterator &It, MachineFunction &MF,
582 const MachineOutlinerInfo &MInfo) const override;
585 /// Commutes the operands in the given instruction by changing the operands
586 /// order and/or changing the instruction's opcode and/or the immediate value
589 /// The arguments 'CommuteOpIdx1' and 'CommuteOpIdx2' specify the operands
592 /// Do not call this method for a non-commutable instruction or
593 /// non-commutable operands.
594 /// Even though the instruction is commutable, the method may still
595 /// fail to commute the operands, null pointer is returned in such cases.
596 MachineInstr *commuteInstructionImpl(MachineInstr &MI, bool NewMI,
597 unsigned CommuteOpIdx1,
598 unsigned CommuteOpIdx2) const override;
601 MachineInstr *convertToThreeAddressWithLEA(unsigned MIOpc,
602 MachineFunction::iterator &MFI,
604 LiveVariables *LV) const;
606 /// Handles memory folding for special case instructions, for instance those
607 /// requiring custom manipulation of the address.
608 MachineInstr *foldMemoryOperandCustom(MachineFunction &MF, MachineInstr &MI,
610 ArrayRef<MachineOperand> MOs,
611 MachineBasicBlock::iterator InsertPt,
612 unsigned Size, unsigned Align) const;
614 /// isFrameOperand - Return true and the FrameIndex if the specified
615 /// operand and follow operands form a reference to the stack frame.
616 bool isFrameOperand(const MachineInstr &MI, unsigned int Op,
617 int &FrameIndex) const;
619 /// Returns true iff the routine could find two commutable operands in the
620 /// given machine instruction with 3 vector inputs.
621 /// The 'SrcOpIdx1' and 'SrcOpIdx2' are INPUT and OUTPUT arguments. Their
622 /// input values can be re-defined in this method only if the input values
623 /// are not pre-defined, which is designated by the special value
624 /// 'CommuteAnyOperandIndex' assigned to it.
625 /// If both of indices are pre-defined and refer to some operands, then the
626 /// method simply returns true if the corresponding operands are commutable
627 /// and returns false otherwise.
629 /// For example, calling this method this way:
630 /// unsigned Op1 = 1, Op2 = CommuteAnyOperandIndex;
631 /// findThreeSrcCommutedOpIndices(MI, Op1, Op2);
632 /// can be interpreted as a query asking to find an operand that would be
633 /// commutable with the operand#1.
634 bool findThreeSrcCommutedOpIndices(const MachineInstr &MI,
636 unsigned &SrcOpIdx2) const;