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/Target/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);
86 } // end namespace X86;
89 /// isGlobalStubReference - Return true if the specified TargetFlag operand is
90 /// a reference to a stub for a global, not the global itself.
91 inline static bool isGlobalStubReference(unsigned char TargetFlag) {
93 case X86II::MO_DLLIMPORT: // dllimport stub.
94 case X86II::MO_GOTPCREL: // rip-relative GOT reference.
95 case X86II::MO_GOT: // normal GOT reference.
96 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: // Normal $non_lazy_ptr ref.
97 case X86II::MO_DARWIN_NONLAZY: // Normal $non_lazy_ptr ref.
104 /// isGlobalRelativeToPICBase - Return true if the specified global value
105 /// reference is relative to a 32-bit PIC base (X86ISD::GlobalBaseReg). If this
106 /// is true, the addressing mode has the PIC base register added in (e.g. EBX).
107 inline static bool isGlobalRelativeToPICBase(unsigned char TargetFlag) {
108 switch (TargetFlag) {
109 case X86II::MO_GOTOFF: // isPICStyleGOT: local global.
110 case X86II::MO_GOT: // isPICStyleGOT: other global.
111 case X86II::MO_PIC_BASE_OFFSET: // Darwin local global.
112 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: // Darwin/32 external global.
113 case X86II::MO_TLVP: // ??? Pretty sure..
120 inline static bool isScale(const MachineOperand &MO) {
122 (MO.getImm() == 1 || MO.getImm() == 2 ||
123 MO.getImm() == 4 || MO.getImm() == 8);
126 inline static bool isLeaMem(const MachineInstr &MI, unsigned Op) {
127 if (MI.getOperand(Op).isFI())
129 return Op + X86::AddrSegmentReg <= MI.getNumOperands() &&
130 MI.getOperand(Op + X86::AddrBaseReg).isReg() &&
131 isScale(MI.getOperand(Op + X86::AddrScaleAmt)) &&
132 MI.getOperand(Op + X86::AddrIndexReg).isReg() &&
133 (MI.getOperand(Op + X86::AddrDisp).isImm() ||
134 MI.getOperand(Op + X86::AddrDisp).isGlobal() ||
135 MI.getOperand(Op + X86::AddrDisp).isCPI() ||
136 MI.getOperand(Op + X86::AddrDisp).isJTI());
139 inline static bool isMem(const MachineInstr &MI, unsigned Op) {
140 if (MI.getOperand(Op).isFI())
142 return Op + X86::AddrNumOperands <= MI.getNumOperands() &&
143 MI.getOperand(Op + X86::AddrSegmentReg).isReg() && isLeaMem(MI, Op);
146 class X86InstrInfo final : public X86GenInstrInfo {
147 X86Subtarget &Subtarget;
148 const X86RegisterInfo RI;
150 /// RegOp2MemOpTable3Addr, RegOp2MemOpTable0, RegOp2MemOpTable1,
151 /// RegOp2MemOpTable2, RegOp2MemOpTable3 - Load / store folding opcode maps.
153 typedef DenseMap<unsigned,
154 std::pair<uint16_t, uint16_t> > RegOp2MemOpTableType;
155 RegOp2MemOpTableType RegOp2MemOpTable2Addr;
156 RegOp2MemOpTableType RegOp2MemOpTable0;
157 RegOp2MemOpTableType RegOp2MemOpTable1;
158 RegOp2MemOpTableType RegOp2MemOpTable2;
159 RegOp2MemOpTableType RegOp2MemOpTable3;
160 RegOp2MemOpTableType RegOp2MemOpTable4;
162 /// MemOp2RegOpTable - Load / store unfolding opcode map.
164 typedef DenseMap<unsigned,
165 std::pair<uint16_t, uint16_t> > MemOp2RegOpTableType;
166 MemOp2RegOpTableType MemOp2RegOpTable;
168 static void AddTableEntry(RegOp2MemOpTableType &R2MTable,
169 MemOp2RegOpTableType &M2RTable,
170 uint16_t RegOp, uint16_t MemOp, uint16_t Flags);
172 virtual void anchor();
174 bool AnalyzeBranchImpl(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
175 MachineBasicBlock *&FBB,
176 SmallVectorImpl<MachineOperand> &Cond,
177 SmallVectorImpl<MachineInstr *> &CondBranches,
178 bool AllowModify) const;
181 explicit X86InstrInfo(X86Subtarget &STI);
183 /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As
184 /// such, whenever a client has an instance of instruction info, it should
185 /// always be able to get register info as well (through this method).
187 const X86RegisterInfo &getRegisterInfo() const { return RI; }
189 /// Returns the stack pointer adjustment that happens inside the frame
190 /// setup..destroy sequence (e.g. by pushes, or inside the callee).
191 int64_t getFrameAdjustment(const MachineInstr &I) const {
192 assert(isFrameInstr(I));
194 return I.getOperand(2).getImm();
195 return I.getOperand(1).getImm();
198 /// Sets the stack pointer adjustment made inside the frame made up by this
200 void setFrameAdjustment(MachineInstr &I, int64_t V) const {
201 assert(isFrameInstr(I));
203 I.getOperand(2).setImm(V);
205 I.getOperand(1).setImm(V);
208 /// getSPAdjust - This returns the stack pointer adjustment made by
209 /// this instruction. For x86, we need to handle more complex call
210 /// sequences involving PUSHes.
211 int getSPAdjust(const MachineInstr &MI) const override;
213 /// isCoalescableExtInstr - Return true if the instruction is a "coalescable"
214 /// extension instruction. That is, it's like a copy where it's legal for the
215 /// source to overlap the destination. e.g. X86::MOVSX64rr32. If this returns
216 /// true, then it's expected the pre-extension value is available as a subreg
217 /// of the result register. This also returns the sub-register index in
219 bool isCoalescableExtInstr(const MachineInstr &MI,
220 unsigned &SrcReg, unsigned &DstReg,
221 unsigned &SubIdx) const override;
223 unsigned isLoadFromStackSlot(const MachineInstr &MI,
224 int &FrameIndex) const override;
225 /// isLoadFromStackSlotPostFE - Check for post-frame ptr elimination
226 /// stack locations as well. This uses a heuristic so it isn't
227 /// reliable for correctness.
228 unsigned isLoadFromStackSlotPostFE(const MachineInstr &MI,
229 int &FrameIndex) const override;
231 unsigned isStoreToStackSlot(const MachineInstr &MI,
232 int &FrameIndex) const override;
233 /// isStoreToStackSlotPostFE - Check for post-frame ptr elimination
234 /// stack locations as well. This uses a heuristic so it isn't
235 /// reliable for correctness.
236 unsigned isStoreToStackSlotPostFE(const MachineInstr &MI,
237 int &FrameIndex) const override;
239 bool isReallyTriviallyReMaterializable(const MachineInstr &MI,
240 AliasAnalysis *AA) const override;
241 void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
242 unsigned DestReg, unsigned SubIdx,
243 const MachineInstr &Orig,
244 const TargetRegisterInfo &TRI) const override;
246 /// Given an operand within a MachineInstr, insert preceding code to put it
247 /// into the right format for a particular kind of LEA instruction. This may
248 /// involve using an appropriate super-register instead (with an implicit use
249 /// of the original) or creating a new virtual register and inserting COPY
250 /// instructions to get the data into the right class.
252 /// Reference parameters are set to indicate how caller should add this
253 /// operand to the LEA instruction.
254 bool classifyLEAReg(MachineInstr &MI, const MachineOperand &Src,
255 unsigned LEAOpcode, bool AllowSP, unsigned &NewSrc,
256 bool &isKill, bool &isUndef,
257 MachineOperand &ImplicitOp, LiveVariables *LV) const;
259 /// convertToThreeAddress - This method must be implemented by targets that
260 /// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
261 /// may be able to convert a two-address instruction into a true
262 /// three-address instruction on demand. This allows the X86 target (for
263 /// example) to convert ADD and SHL instructions into LEA instructions if they
264 /// would require register copies due to two-addressness.
266 /// This method returns a null pointer if the transformation cannot be
267 /// performed, otherwise it returns the new instruction.
269 MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI,
271 LiveVariables *LV) const override;
273 /// Returns true iff the routine could find two commutable operands in the
274 /// given machine instruction.
275 /// The 'SrcOpIdx1' and 'SrcOpIdx2' are INPUT and OUTPUT arguments. Their
276 /// input values can be re-defined in this method only if the input values
277 /// are not pre-defined, which is designated by the special value
278 /// 'CommuteAnyOperandIndex' assigned to it.
279 /// If both of indices are pre-defined and refer to some operands, then the
280 /// method simply returns true if the corresponding operands are commutable
281 /// and returns false otherwise.
283 /// For example, calling this method this way:
284 /// unsigned Op1 = 1, Op2 = CommuteAnyOperandIndex;
285 /// findCommutedOpIndices(MI, Op1, Op2);
286 /// can be interpreted as a query asking to find an operand that would be
287 /// commutable with the operand#1.
288 bool findCommutedOpIndices(MachineInstr &MI, unsigned &SrcOpIdx1,
289 unsigned &SrcOpIdx2) const override;
291 /// Returns true if the routine could find two commutable operands
292 /// in the given FMA instruction \p MI. Otherwise, returns false.
294 /// \p SrcOpIdx1 and \p SrcOpIdx2 are INPUT and OUTPUT arguments.
295 /// The output indices of the commuted operands are returned in these
296 /// arguments. Also, the input values of these arguments may be preset either
297 /// to indices of operands that must be commuted or be equal to a special
298 /// value 'CommuteAnyOperandIndex' which means that the corresponding
299 /// operand index is not set and this method is free to pick any of
300 /// available commutable operands.
301 /// The parameter \p FMA3Group keeps the reference to the group of relative
302 /// FMA3 opcodes including register/memory forms of 132/213/231 opcodes.
304 /// For example, calling this method this way:
305 /// unsigned Idx1 = 1, Idx2 = CommuteAnyOperandIndex;
306 /// findFMA3CommutedOpIndices(MI, Idx1, Idx2, FMA3Group);
307 /// can be interpreted as a query asking if the operand #1 can be swapped
308 /// with any other available operand (e.g. operand #2, operand #3, etc.).
310 /// The returned FMA opcode may differ from the opcode in the given MI.
311 /// For example, commuting the operands #1 and #3 in the following FMA
312 /// FMA213 #1, #2, #3
313 /// results into instruction with adjusted opcode:
314 /// FMA231 #3, #2, #1
315 bool findFMA3CommutedOpIndices(const MachineInstr &MI,
318 const X86InstrFMA3Group &FMA3Group) const;
320 /// Returns an adjusted FMA opcode that must be used in FMA instruction that
321 /// performs the same computations as the given \p MI but which has the
322 /// operands \p SrcOpIdx1 and \p SrcOpIdx2 commuted.
323 /// It may return 0 if it is unsafe to commute the operands.
324 /// Note that a machine instruction (instead of its opcode) is passed as the
325 /// first parameter to make it possible to analyze the instruction's uses and
326 /// commute the first operand of FMA even when it seems unsafe when you look
327 /// at the opcode. For example, it is Ok to commute the first operand of
328 /// VFMADD*SD_Int, if ONLY the lowest 64-bit element of the result is used.
330 /// The returned FMA opcode may differ from the opcode in the given \p MI.
331 /// For example, commuting the operands #1 and #3 in the following FMA
332 /// FMA213 #1, #2, #3
333 /// results into instruction with adjusted opcode:
334 /// FMA231 #3, #2, #1
335 unsigned getFMA3OpcodeToCommuteOperands(const MachineInstr &MI,
338 const X86InstrFMA3Group &FMA3Group) const;
341 bool isUnpredicatedTerminator(const MachineInstr &MI) const override;
342 bool isUnconditionalTailCall(const MachineInstr &MI) const override;
343 bool canMakeTailCallConditional(SmallVectorImpl<MachineOperand> &Cond,
344 const MachineInstr &TailCall) const override;
345 void replaceBranchWithTailCall(MachineBasicBlock &MBB,
346 SmallVectorImpl<MachineOperand> &Cond,
347 const MachineInstr &TailCall) const override;
349 bool analyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
350 MachineBasicBlock *&FBB,
351 SmallVectorImpl<MachineOperand> &Cond,
352 bool AllowModify) const override;
354 bool getMemOpBaseRegImmOfs(MachineInstr &LdSt, unsigned &BaseReg,
356 const TargetRegisterInfo *TRI) const override;
357 bool analyzeBranchPredicate(MachineBasicBlock &MBB,
358 TargetInstrInfo::MachineBranchPredicate &MBP,
359 bool AllowModify = false) const override;
361 unsigned removeBranch(MachineBasicBlock &MBB,
362 int *BytesRemoved = nullptr) const override;
363 unsigned insertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
364 MachineBasicBlock *FBB, ArrayRef<MachineOperand> Cond,
366 int *BytesAdded = nullptr) const override;
367 bool canInsertSelect(const MachineBasicBlock&, ArrayRef<MachineOperand> Cond,
368 unsigned, unsigned, int&, int&, int&) const override;
369 void insertSelect(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
370 const DebugLoc &DL, unsigned DstReg,
371 ArrayRef<MachineOperand> Cond, unsigned TrueReg,
372 unsigned FalseReg) const override;
373 void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
374 const DebugLoc &DL, unsigned DestReg, unsigned SrcReg,
375 bool KillSrc) const override;
376 void storeRegToStackSlot(MachineBasicBlock &MBB,
377 MachineBasicBlock::iterator MI,
378 unsigned SrcReg, bool isKill, int FrameIndex,
379 const TargetRegisterClass *RC,
380 const TargetRegisterInfo *TRI) const override;
382 void storeRegToAddr(MachineFunction &MF, unsigned SrcReg, bool isKill,
383 SmallVectorImpl<MachineOperand> &Addr,
384 const TargetRegisterClass *RC,
385 MachineInstr::mmo_iterator MMOBegin,
386 MachineInstr::mmo_iterator MMOEnd,
387 SmallVectorImpl<MachineInstr*> &NewMIs) const;
389 void loadRegFromStackSlot(MachineBasicBlock &MBB,
390 MachineBasicBlock::iterator MI,
391 unsigned DestReg, int FrameIndex,
392 const TargetRegisterClass *RC,
393 const TargetRegisterInfo *TRI) const override;
395 void loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
396 SmallVectorImpl<MachineOperand> &Addr,
397 const TargetRegisterClass *RC,
398 MachineInstr::mmo_iterator MMOBegin,
399 MachineInstr::mmo_iterator MMOEnd,
400 SmallVectorImpl<MachineInstr*> &NewMIs) const;
402 bool expandPostRAPseudo(MachineInstr &MI) const override;
404 /// Check whether the target can fold a load that feeds a subreg operand
405 /// (or a subreg operand that feeds a store).
406 bool isSubregFoldable() const override { return true; }
408 /// foldMemoryOperand - If this target supports it, fold a load or store of
409 /// the specified stack slot into the specified machine instruction for the
410 /// specified operand(s). If this is possible, the target should perform the
411 /// folding and return true, otherwise it should return false. If it folds
412 /// the instruction, it is likely that the MachineInstruction the iterator
413 /// references has been changed.
415 foldMemoryOperandImpl(MachineFunction &MF, MachineInstr &MI,
416 ArrayRef<unsigned> Ops,
417 MachineBasicBlock::iterator InsertPt, int FrameIndex,
418 LiveIntervals *LIS = nullptr) const override;
420 /// foldMemoryOperand - Same as the previous version except it allows folding
421 /// of any load and store from / to any address, not just from a specific
423 MachineInstr *foldMemoryOperandImpl(
424 MachineFunction &MF, MachineInstr &MI, ArrayRef<unsigned> Ops,
425 MachineBasicBlock::iterator InsertPt, MachineInstr &LoadMI,
426 LiveIntervals *LIS = nullptr) const override;
428 /// unfoldMemoryOperand - Separate a single instruction which folded a load or
429 /// a store or a load and a store into two or more instruction. If this is
430 /// possible, returns true as well as the new instructions by reference.
432 unfoldMemoryOperand(MachineFunction &MF, MachineInstr &MI, unsigned Reg,
433 bool UnfoldLoad, bool UnfoldStore,
434 SmallVectorImpl<MachineInstr *> &NewMIs) const override;
436 bool unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
437 SmallVectorImpl<SDNode*> &NewNodes) const override;
439 /// getOpcodeAfterMemoryUnfold - Returns the opcode of the would be new
440 /// instruction after load / store are unfolded from an instruction of the
441 /// specified opcode. It returns zero if the specified unfolding is not
442 /// possible. If LoadRegIndex is non-null, it is filled in with the operand
443 /// index of the operand which will hold the register holding the loaded
445 unsigned getOpcodeAfterMemoryUnfold(unsigned Opc,
446 bool UnfoldLoad, bool UnfoldStore,
447 unsigned *LoadRegIndex = nullptr) const override;
449 /// areLoadsFromSameBasePtr - This is used by the pre-regalloc scheduler
450 /// to determine if two loads are loading from the same base address. It
451 /// should only return true if the base pointers are the same and the
452 /// only differences between the two addresses are the offset. It also returns
453 /// the offsets by reference.
454 bool areLoadsFromSameBasePtr(SDNode *Load1, SDNode *Load2, int64_t &Offset1,
455 int64_t &Offset2) const override;
457 /// shouldScheduleLoadsNear - This is a used by the pre-regalloc scheduler to
458 /// determine (in conjunction with areLoadsFromSameBasePtr) if two loads should
459 /// be scheduled togther. On some targets if two loads are loading from
460 /// addresses in the same cache line, it's better if they are scheduled
461 /// together. This function takes two integers that represent the load offsets
462 /// from the common base address. It returns true if it decides it's desirable
463 /// to schedule the two loads together. "NumLoads" is the number of loads that
464 /// have already been scheduled after Load1.
465 bool shouldScheduleLoadsNear(SDNode *Load1, SDNode *Load2,
466 int64_t Offset1, int64_t Offset2,
467 unsigned NumLoads) const override;
469 void getNoop(MCInst &NopInst) const override;
472 reverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const override;
474 /// isSafeToMoveRegClassDefs - Return true if it's safe to move a machine
475 /// instruction that defines the specified register class.
476 bool isSafeToMoveRegClassDefs(const TargetRegisterClass *RC) const override;
478 /// isSafeToClobberEFLAGS - Return true if it's safe insert an instruction tha
479 /// would clobber the EFLAGS condition register. Note the result may be
480 /// conservative. If it cannot definitely determine the safety after visiting
481 /// a few instructions in each direction it assumes it's not safe.
482 bool isSafeToClobberEFLAGS(MachineBasicBlock &MBB,
483 MachineBasicBlock::iterator I) const;
485 /// True if MI has a condition code def, e.g. EFLAGS, that is
487 bool hasLiveCondCodeDef(MachineInstr &MI) const;
489 /// getGlobalBaseReg - Return a virtual register initialized with the
490 /// the global base register value. Output instructions required to
491 /// initialize the register in the function entry block, if necessary.
493 unsigned getGlobalBaseReg(MachineFunction *MF) const;
495 std::pair<uint16_t, uint16_t>
496 getExecutionDomain(const MachineInstr &MI) const override;
498 void setExecutionDomain(MachineInstr &MI, unsigned Domain) const override;
501 getPartialRegUpdateClearance(const MachineInstr &MI, unsigned OpNum,
502 const TargetRegisterInfo *TRI) const override;
503 unsigned getUndefRegClearance(const MachineInstr &MI, unsigned &OpNum,
504 const TargetRegisterInfo *TRI) const override;
505 void breakPartialRegDependency(MachineInstr &MI, unsigned OpNum,
506 const TargetRegisterInfo *TRI) const override;
508 MachineInstr *foldMemoryOperandImpl(MachineFunction &MF, MachineInstr &MI,
510 ArrayRef<MachineOperand> MOs,
511 MachineBasicBlock::iterator InsertPt,
512 unsigned Size, unsigned Alignment,
513 bool AllowCommute) const;
515 bool isHighLatencyDef(int opc) const override;
517 bool hasHighOperandLatency(const TargetSchedModel &SchedModel,
518 const MachineRegisterInfo *MRI,
519 const MachineInstr &DefMI, unsigned DefIdx,
520 const MachineInstr &UseMI,
521 unsigned UseIdx) const override;
523 bool useMachineCombiner() const override {
527 bool isAssociativeAndCommutative(const MachineInstr &Inst) const override;
529 bool hasReassociableOperands(const MachineInstr &Inst,
530 const MachineBasicBlock *MBB) const override;
532 void setSpecialOperandAttr(MachineInstr &OldMI1, MachineInstr &OldMI2,
533 MachineInstr &NewMI1,
534 MachineInstr &NewMI2) const override;
536 /// analyzeCompare - For a comparison instruction, return the source registers
537 /// in SrcReg and SrcReg2 if having two register operands, and the value it
538 /// compares against in CmpValue. Return true if the comparison instruction
540 bool analyzeCompare(const MachineInstr &MI, unsigned &SrcReg,
541 unsigned &SrcReg2, int &CmpMask,
542 int &CmpValue) const override;
544 /// optimizeCompareInstr - Check if there exists an earlier instruction that
545 /// operates on the same source operands and sets flags in the same way as
546 /// Compare; remove Compare if possible.
547 bool optimizeCompareInstr(MachineInstr &CmpInstr, unsigned SrcReg,
548 unsigned SrcReg2, int CmpMask, int CmpValue,
549 const MachineRegisterInfo *MRI) const override;
551 /// optimizeLoadInstr - Try to remove the load by folding it to a register
552 /// operand at the use. We fold the load instructions if and only if the
553 /// def and use are in the same BB. We only look at one load and see
554 /// whether it can be folded into MI. FoldAsLoadDefReg is the virtual register
555 /// defined by the load we are trying to fold. DefMI returns the machine
556 /// instruction that defines FoldAsLoadDefReg, and the function returns
557 /// the machine instruction generated due to folding.
558 MachineInstr *optimizeLoadInstr(MachineInstr &MI,
559 const MachineRegisterInfo *MRI,
560 unsigned &FoldAsLoadDefReg,
561 MachineInstr *&DefMI) const override;
563 std::pair<unsigned, unsigned>
564 decomposeMachineOperandsTargetFlags(unsigned TF) const override;
566 ArrayRef<std::pair<unsigned, const char *>>
567 getSerializableDirectMachineOperandTargetFlags() const override;
569 unsigned getOutliningBenefit(size_t SequenceSize,
571 bool CanBeTailCall) const override;
573 bool isFunctionSafeToOutlineFrom(MachineFunction &MF) const override;
575 llvm::X86GenInstrInfo::MachineOutlinerInstrType
576 getOutliningType(MachineInstr &MI) const override;
578 void insertOutlinerEpilogue(MachineBasicBlock &MBB,
580 bool IsTailCall) const override;
582 void insertOutlinerPrologue(MachineBasicBlock &MBB,
584 bool isTailCall) const override;
586 MachineBasicBlock::iterator
587 insertOutlinedCall(Module &M, MachineBasicBlock &MBB,
588 MachineBasicBlock::iterator &It,
590 bool IsTailCall) const override;
592 /// Commutes the operands in the given instruction by changing the operands
593 /// order and/or changing the instruction's opcode and/or the immediate value
596 /// The arguments 'CommuteOpIdx1' and 'CommuteOpIdx2' specify the operands
599 /// Do not call this method for a non-commutable instruction or
600 /// non-commutable operands.
601 /// Even though the instruction is commutable, the method may still
602 /// fail to commute the operands, null pointer is returned in such cases.
603 MachineInstr *commuteInstructionImpl(MachineInstr &MI, bool NewMI,
604 unsigned CommuteOpIdx1,
605 unsigned CommuteOpIdx2) const override;
608 MachineInstr *convertToThreeAddressWithLEA(unsigned MIOpc,
609 MachineFunction::iterator &MFI,
611 LiveVariables *LV) const;
613 /// Handles memory folding for special case instructions, for instance those
614 /// requiring custom manipulation of the address.
615 MachineInstr *foldMemoryOperandCustom(MachineFunction &MF, MachineInstr &MI,
617 ArrayRef<MachineOperand> MOs,
618 MachineBasicBlock::iterator InsertPt,
619 unsigned Size, unsigned Align) const;
621 /// isFrameOperand - Return true and the FrameIndex if the specified
622 /// operand and follow operands form a reference to the stack frame.
623 bool isFrameOperand(const MachineInstr &MI, unsigned int Op,
624 int &FrameIndex) const;
626 /// Returns true iff the routine could find two commutable operands in the
627 /// given machine instruction with 3 vector inputs.
628 /// The 'SrcOpIdx1' and 'SrcOpIdx2' are INPUT and OUTPUT arguments. Their
629 /// input values can be re-defined in this method only if the input values
630 /// are not pre-defined, which is designated by the special value
631 /// 'CommuteAnyOperandIndex' assigned to it.
632 /// If both of indices are pre-defined and refer to some operands, then the
633 /// method simply returns true if the corresponding operands are commutable
634 /// and returns false otherwise.
636 /// For example, calling this method this way:
637 /// unsigned Op1 = 1, Op2 = CommuteAnyOperandIndex;
638 /// findThreeSrcCommutedOpIndices(MI, Op1, Op2);
639 /// can be interpreted as a query asking to find an operand that would be
640 /// commutable with the operand#1.
641 bool findThreeSrcCommutedOpIndices(const MachineInstr &MI,
643 unsigned &SrcOpIdx2) const;
646 } // End llvm namespace