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 set opcode for the given condition and whether it has
69 unsigned getSETFromCond(CondCode CC, bool HasMemoryOperand = false);
71 /// \brief Return a cmov opcode for the given condition, register size in
72 /// bytes, and operand type.
73 unsigned getCMovFromCond(CondCode CC, unsigned RegBytes,
74 bool HasMemoryOperand = false);
76 // Turn CMov opcode into condition code.
77 CondCode getCondFromCMovOpc(unsigned Opc);
79 /// GetOppositeBranchCondition - Return the inverse of the specified cond,
80 /// e.g. turning COND_E to COND_NE.
81 CondCode GetOppositeBranchCondition(CondCode CC);
82 } // end namespace X86;
85 /// isGlobalStubReference - Return true if the specified TargetFlag operand is
86 /// a reference to a stub for a global, not the global itself.
87 inline static bool isGlobalStubReference(unsigned char TargetFlag) {
89 case X86II::MO_DLLIMPORT: // dllimport stub.
90 case X86II::MO_GOTPCREL: // rip-relative GOT reference.
91 case X86II::MO_GOT: // normal GOT reference.
92 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: // Normal $non_lazy_ptr ref.
93 case X86II::MO_DARWIN_NONLAZY: // Normal $non_lazy_ptr ref.
100 /// isGlobalRelativeToPICBase - Return true if the specified global value
101 /// reference is relative to a 32-bit PIC base (X86ISD::GlobalBaseReg). If this
102 /// is true, the addressing mode has the PIC base register added in (e.g. EBX).
103 inline static bool isGlobalRelativeToPICBase(unsigned char TargetFlag) {
104 switch (TargetFlag) {
105 case X86II::MO_GOTOFF: // isPICStyleGOT: local global.
106 case X86II::MO_GOT: // isPICStyleGOT: other global.
107 case X86II::MO_PIC_BASE_OFFSET: // Darwin local global.
108 case X86II::MO_DARWIN_NONLAZY_PIC_BASE: // Darwin/32 external global.
109 case X86II::MO_TLVP: // ??? Pretty sure..
116 inline static bool isScale(const MachineOperand &MO) {
118 (MO.getImm() == 1 || MO.getImm() == 2 ||
119 MO.getImm() == 4 || MO.getImm() == 8);
122 inline static bool isLeaMem(const MachineInstr &MI, unsigned Op) {
123 if (MI.getOperand(Op).isFI())
125 return Op + X86::AddrSegmentReg <= MI.getNumOperands() &&
126 MI.getOperand(Op + X86::AddrBaseReg).isReg() &&
127 isScale(MI.getOperand(Op + X86::AddrScaleAmt)) &&
128 MI.getOperand(Op + X86::AddrIndexReg).isReg() &&
129 (MI.getOperand(Op + X86::AddrDisp).isImm() ||
130 MI.getOperand(Op + X86::AddrDisp).isGlobal() ||
131 MI.getOperand(Op + X86::AddrDisp).isCPI() ||
132 MI.getOperand(Op + X86::AddrDisp).isJTI());
135 inline static bool isMem(const MachineInstr &MI, unsigned Op) {
136 if (MI.getOperand(Op).isFI())
138 return Op + X86::AddrNumOperands <= MI.getNumOperands() &&
139 MI.getOperand(Op + X86::AddrSegmentReg).isReg() && isLeaMem(MI, Op);
142 class X86InstrInfo final : public X86GenInstrInfo {
143 X86Subtarget &Subtarget;
144 const X86RegisterInfo RI;
146 /// RegOp2MemOpTable3Addr, RegOp2MemOpTable0, RegOp2MemOpTable1,
147 /// RegOp2MemOpTable2, RegOp2MemOpTable3 - Load / store folding opcode maps.
149 typedef DenseMap<unsigned,
150 std::pair<uint16_t, uint16_t> > RegOp2MemOpTableType;
151 RegOp2MemOpTableType RegOp2MemOpTable2Addr;
152 RegOp2MemOpTableType RegOp2MemOpTable0;
153 RegOp2MemOpTableType RegOp2MemOpTable1;
154 RegOp2MemOpTableType RegOp2MemOpTable2;
155 RegOp2MemOpTableType RegOp2MemOpTable3;
156 RegOp2MemOpTableType RegOp2MemOpTable4;
158 /// MemOp2RegOpTable - Load / store unfolding opcode map.
160 typedef DenseMap<unsigned,
161 std::pair<uint16_t, uint16_t> > MemOp2RegOpTableType;
162 MemOp2RegOpTableType MemOp2RegOpTable;
164 static void AddTableEntry(RegOp2MemOpTableType &R2MTable,
165 MemOp2RegOpTableType &M2RTable,
166 uint16_t RegOp, uint16_t MemOp, uint16_t Flags);
168 virtual void anchor();
170 bool AnalyzeBranchImpl(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
171 MachineBasicBlock *&FBB,
172 SmallVectorImpl<MachineOperand> &Cond,
173 SmallVectorImpl<MachineInstr *> &CondBranches,
174 bool AllowModify) const;
177 explicit X86InstrInfo(X86Subtarget &STI);
179 /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As
180 /// such, whenever a client has an instance of instruction info, it should
181 /// always be able to get register info as well (through this method).
183 const X86RegisterInfo &getRegisterInfo() const { return RI; }
185 /// getSPAdjust - This returns the stack pointer adjustment made by
186 /// this instruction. For x86, we need to handle more complex call
187 /// sequences involving PUSHes.
188 int getSPAdjust(const MachineInstr &MI) const override;
190 /// isCoalescableExtInstr - Return true if the instruction is a "coalescable"
191 /// extension instruction. That is, it's like a copy where it's legal for the
192 /// source to overlap the destination. e.g. X86::MOVSX64rr32. If this returns
193 /// true, then it's expected the pre-extension value is available as a subreg
194 /// of the result register. This also returns the sub-register index in
196 bool isCoalescableExtInstr(const MachineInstr &MI,
197 unsigned &SrcReg, unsigned &DstReg,
198 unsigned &SubIdx) const override;
200 unsigned isLoadFromStackSlot(const MachineInstr &MI,
201 int &FrameIndex) const override;
202 /// isLoadFromStackSlotPostFE - Check for post-frame ptr elimination
203 /// stack locations as well. This uses a heuristic so it isn't
204 /// reliable for correctness.
205 unsigned isLoadFromStackSlotPostFE(const MachineInstr &MI,
206 int &FrameIndex) const override;
208 unsigned isStoreToStackSlot(const MachineInstr &MI,
209 int &FrameIndex) const override;
210 /// isStoreToStackSlotPostFE - Check for post-frame ptr elimination
211 /// stack locations as well. This uses a heuristic so it isn't
212 /// reliable for correctness.
213 unsigned isStoreToStackSlotPostFE(const MachineInstr &MI,
214 int &FrameIndex) const override;
216 bool isReallyTriviallyReMaterializable(const MachineInstr &MI,
217 AliasAnalysis *AA) const override;
218 void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
219 unsigned DestReg, unsigned SubIdx,
220 const MachineInstr &Orig,
221 const TargetRegisterInfo &TRI) const override;
223 /// Given an operand within a MachineInstr, insert preceding code to put it
224 /// into the right format for a particular kind of LEA instruction. This may
225 /// involve using an appropriate super-register instead (with an implicit use
226 /// of the original) or creating a new virtual register and inserting COPY
227 /// instructions to get the data into the right class.
229 /// Reference parameters are set to indicate how caller should add this
230 /// operand to the LEA instruction.
231 bool classifyLEAReg(MachineInstr &MI, const MachineOperand &Src,
232 unsigned LEAOpcode, bool AllowSP, unsigned &NewSrc,
233 bool &isKill, bool &isUndef,
234 MachineOperand &ImplicitOp, LiveVariables *LV) const;
236 /// convertToThreeAddress - This method must be implemented by targets that
237 /// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
238 /// may be able to convert a two-address instruction into a true
239 /// three-address instruction on demand. This allows the X86 target (for
240 /// example) to convert ADD and SHL instructions into LEA instructions if they
241 /// would require register copies due to two-addressness.
243 /// This method returns a null pointer if the transformation cannot be
244 /// performed, otherwise it returns the new instruction.
246 MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI,
248 LiveVariables *LV) const override;
250 /// Returns true iff the routine could find two commutable operands in the
251 /// given machine instruction.
252 /// The 'SrcOpIdx1' and 'SrcOpIdx2' are INPUT and OUTPUT arguments. Their
253 /// input values can be re-defined in this method only if the input values
254 /// are not pre-defined, which is designated by the special value
255 /// 'CommuteAnyOperandIndex' assigned to it.
256 /// If both of indices are pre-defined and refer to some operands, then the
257 /// method simply returns true if the corresponding operands are commutable
258 /// and returns false otherwise.
260 /// For example, calling this method this way:
261 /// unsigned Op1 = 1, Op2 = CommuteAnyOperandIndex;
262 /// findCommutedOpIndices(MI, Op1, Op2);
263 /// can be interpreted as a query asking to find an operand that would be
264 /// commutable with the operand#1.
265 bool findCommutedOpIndices(MachineInstr &MI, unsigned &SrcOpIdx1,
266 unsigned &SrcOpIdx2) const override;
268 /// Returns true if the routine could find two commutable operands
269 /// in the given FMA instruction \p MI. Otherwise, returns false.
271 /// \p SrcOpIdx1 and \p SrcOpIdx2 are INPUT and OUTPUT arguments.
272 /// The output indices of the commuted operands are returned in these
273 /// arguments. Also, the input values of these arguments may be preset either
274 /// to indices of operands that must be commuted or be equal to a special
275 /// value 'CommuteAnyOperandIndex' which means that the corresponding
276 /// operand index is not set and this method is free to pick any of
277 /// available commutable operands.
278 /// The parameter \p FMA3Group keeps the reference to the group of relative
279 /// FMA3 opcodes including register/memory forms of 132/213/231 opcodes.
281 /// For example, calling this method this way:
282 /// unsigned Idx1 = 1, Idx2 = CommuteAnyOperandIndex;
283 /// findFMA3CommutedOpIndices(MI, Idx1, Idx2, FMA3Group);
284 /// can be interpreted as a query asking if the operand #1 can be swapped
285 /// with any other available operand (e.g. operand #2, operand #3, etc.).
287 /// The returned FMA opcode may differ from the opcode in the given MI.
288 /// For example, commuting the operands #1 and #3 in the following FMA
289 /// FMA213 #1, #2, #3
290 /// results into instruction with adjusted opcode:
291 /// FMA231 #3, #2, #1
292 bool findFMA3CommutedOpIndices(const MachineInstr &MI,
295 const X86InstrFMA3Group &FMA3Group) const;
297 /// Returns an adjusted FMA opcode that must be used in FMA instruction that
298 /// performs the same computations as the given \p MI but which has the
299 /// operands \p SrcOpIdx1 and \p SrcOpIdx2 commuted.
300 /// It may return 0 if it is unsafe to commute the operands.
301 /// Note that a machine instruction (instead of its opcode) is passed as the
302 /// first parameter to make it possible to analyze the instruction's uses and
303 /// commute the first operand of FMA even when it seems unsafe when you look
304 /// at the opcode. For example, it is Ok to commute the first operand of
305 /// VFMADD*SD_Int, if ONLY the lowest 64-bit element of the result is used.
307 /// The returned FMA opcode may differ from the opcode in the given \p 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 unsigned getFMA3OpcodeToCommuteOperands(const MachineInstr &MI,
315 const X86InstrFMA3Group &FMA3Group) const;
318 bool isUnpredicatedTerminator(const MachineInstr &MI) const override;
319 bool analyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
320 MachineBasicBlock *&FBB,
321 SmallVectorImpl<MachineOperand> &Cond,
322 bool AllowModify) const override;
324 bool getMemOpBaseRegImmOfs(MachineInstr &LdSt, unsigned &BaseReg,
326 const TargetRegisterInfo *TRI) const override;
327 bool analyzeBranchPredicate(MachineBasicBlock &MBB,
328 TargetInstrInfo::MachineBranchPredicate &MBP,
329 bool AllowModify = false) const override;
331 unsigned removeBranch(MachineBasicBlock &MBB,
332 int *BytesRemoved = nullptr) const override;
333 unsigned insertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
334 MachineBasicBlock *FBB, ArrayRef<MachineOperand> Cond,
336 int *BytesAdded = nullptr) const override;
337 bool canInsertSelect(const MachineBasicBlock&, ArrayRef<MachineOperand> Cond,
338 unsigned, unsigned, int&, int&, int&) const override;
339 void insertSelect(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
340 const DebugLoc &DL, unsigned DstReg,
341 ArrayRef<MachineOperand> Cond, unsigned TrueReg,
342 unsigned FalseReg) const override;
343 void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
344 const DebugLoc &DL, unsigned DestReg, unsigned SrcReg,
345 bool KillSrc) const override;
346 void storeRegToStackSlot(MachineBasicBlock &MBB,
347 MachineBasicBlock::iterator MI,
348 unsigned SrcReg, bool isKill, int FrameIndex,
349 const TargetRegisterClass *RC,
350 const TargetRegisterInfo *TRI) const override;
352 void storeRegToAddr(MachineFunction &MF, unsigned SrcReg, bool isKill,
353 SmallVectorImpl<MachineOperand> &Addr,
354 const TargetRegisterClass *RC,
355 MachineInstr::mmo_iterator MMOBegin,
356 MachineInstr::mmo_iterator MMOEnd,
357 SmallVectorImpl<MachineInstr*> &NewMIs) const;
359 void loadRegFromStackSlot(MachineBasicBlock &MBB,
360 MachineBasicBlock::iterator MI,
361 unsigned DestReg, int FrameIndex,
362 const TargetRegisterClass *RC,
363 const TargetRegisterInfo *TRI) const override;
365 void loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
366 SmallVectorImpl<MachineOperand> &Addr,
367 const TargetRegisterClass *RC,
368 MachineInstr::mmo_iterator MMOBegin,
369 MachineInstr::mmo_iterator MMOEnd,
370 SmallVectorImpl<MachineInstr*> &NewMIs) const;
372 bool expandPostRAPseudo(MachineInstr &MI) const override;
374 /// Check whether the target can fold a load that feeds a subreg operand
375 /// (or a subreg operand that feeds a store).
376 bool isSubregFoldable() const override { return true; }
378 /// foldMemoryOperand - If this target supports it, fold a load or store of
379 /// the specified stack slot into the specified machine instruction for the
380 /// specified operand(s). If this is possible, the target should perform the
381 /// folding and return true, otherwise it should return false. If it folds
382 /// the instruction, it is likely that the MachineInstruction the iterator
383 /// references has been changed.
385 foldMemoryOperandImpl(MachineFunction &MF, MachineInstr &MI,
386 ArrayRef<unsigned> Ops,
387 MachineBasicBlock::iterator InsertPt, int FrameIndex,
388 LiveIntervals *LIS = nullptr) const override;
390 /// foldMemoryOperand - Same as the previous version except it allows folding
391 /// of any load and store from / to any address, not just from a specific
393 MachineInstr *foldMemoryOperandImpl(
394 MachineFunction &MF, MachineInstr &MI, ArrayRef<unsigned> Ops,
395 MachineBasicBlock::iterator InsertPt, MachineInstr &LoadMI,
396 LiveIntervals *LIS = nullptr) const override;
398 /// unfoldMemoryOperand - Separate a single instruction which folded a load or
399 /// a store or a load and a store into two or more instruction. If this is
400 /// possible, returns true as well as the new instructions by reference.
402 unfoldMemoryOperand(MachineFunction &MF, MachineInstr &MI, unsigned Reg,
403 bool UnfoldLoad, bool UnfoldStore,
404 SmallVectorImpl<MachineInstr *> &NewMIs) const override;
406 bool unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
407 SmallVectorImpl<SDNode*> &NewNodes) const override;
409 /// getOpcodeAfterMemoryUnfold - Returns the opcode of the would be new
410 /// instruction after load / store are unfolded from an instruction of the
411 /// specified opcode. It returns zero if the specified unfolding is not
412 /// possible. If LoadRegIndex is non-null, it is filled in with the operand
413 /// index of the operand which will hold the register holding the loaded
415 unsigned getOpcodeAfterMemoryUnfold(unsigned Opc,
416 bool UnfoldLoad, bool UnfoldStore,
417 unsigned *LoadRegIndex = nullptr) const override;
419 /// areLoadsFromSameBasePtr - This is used by the pre-regalloc scheduler
420 /// to determine if two loads are loading from the same base address. It
421 /// should only return true if the base pointers are the same and the
422 /// only differences between the two addresses are the offset. It also returns
423 /// the offsets by reference.
424 bool areLoadsFromSameBasePtr(SDNode *Load1, SDNode *Load2, int64_t &Offset1,
425 int64_t &Offset2) const override;
427 /// shouldScheduleLoadsNear - This is a used by the pre-regalloc scheduler to
428 /// determine (in conjunction with areLoadsFromSameBasePtr) if two loads should
429 /// be scheduled togther. On some targets if two loads are loading from
430 /// addresses in the same cache line, it's better if they are scheduled
431 /// together. This function takes two integers that represent the load offsets
432 /// from the common base address. It returns true if it decides it's desirable
433 /// to schedule the two loads together. "NumLoads" is the number of loads that
434 /// have already been scheduled after Load1.
435 bool shouldScheduleLoadsNear(SDNode *Load1, SDNode *Load2,
436 int64_t Offset1, int64_t Offset2,
437 unsigned NumLoads) const override;
439 bool shouldScheduleAdjacent(const MachineInstr &First,
440 const MachineInstr &Second) const override;
442 void getNoopForMachoTarget(MCInst &NopInst) const override;
445 reverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const override;
447 /// isSafeToMoveRegClassDefs - Return true if it's safe to move a machine
448 /// instruction that defines the specified register class.
449 bool isSafeToMoveRegClassDefs(const TargetRegisterClass *RC) const override;
451 /// isSafeToClobberEFLAGS - Return true if it's safe insert an instruction tha
452 /// would clobber the EFLAGS condition register. Note the result may be
453 /// conservative. If it cannot definitely determine the safety after visiting
454 /// a few instructions in each direction it assumes it's not safe.
455 bool isSafeToClobberEFLAGS(MachineBasicBlock &MBB,
456 MachineBasicBlock::iterator I) const;
458 /// True if MI has a condition code def, e.g. EFLAGS, that is
460 bool hasLiveCondCodeDef(MachineInstr &MI) const;
462 /// getGlobalBaseReg - Return a virtual register initialized with the
463 /// the global base register value. Output instructions required to
464 /// initialize the register in the function entry block, if necessary.
466 unsigned getGlobalBaseReg(MachineFunction *MF) const;
468 std::pair<uint16_t, uint16_t>
469 getExecutionDomain(const MachineInstr &MI) const override;
471 void setExecutionDomain(MachineInstr &MI, unsigned Domain) const override;
474 getPartialRegUpdateClearance(const MachineInstr &MI, unsigned OpNum,
475 const TargetRegisterInfo *TRI) const override;
476 unsigned getUndefRegClearance(const MachineInstr &MI, unsigned &OpNum,
477 const TargetRegisterInfo *TRI) const override;
478 void breakPartialRegDependency(MachineInstr &MI, unsigned OpNum,
479 const TargetRegisterInfo *TRI) const override;
481 MachineInstr *foldMemoryOperandImpl(MachineFunction &MF, MachineInstr &MI,
483 ArrayRef<MachineOperand> MOs,
484 MachineBasicBlock::iterator InsertPt,
485 unsigned Size, unsigned Alignment,
486 bool AllowCommute) const;
488 bool isHighLatencyDef(int opc) const override;
490 bool hasHighOperandLatency(const TargetSchedModel &SchedModel,
491 const MachineRegisterInfo *MRI,
492 const MachineInstr &DefMI, unsigned DefIdx,
493 const MachineInstr &UseMI,
494 unsigned UseIdx) const override;
496 bool useMachineCombiner() const override {
500 bool isAssociativeAndCommutative(const MachineInstr &Inst) const override;
502 bool hasReassociableOperands(const MachineInstr &Inst,
503 const MachineBasicBlock *MBB) const override;
505 void setSpecialOperandAttr(MachineInstr &OldMI1, MachineInstr &OldMI2,
506 MachineInstr &NewMI1,
507 MachineInstr &NewMI2) const override;
509 /// analyzeCompare - For a comparison instruction, return the source registers
510 /// in SrcReg and SrcReg2 if having two register operands, and the value it
511 /// compares against in CmpValue. Return true if the comparison instruction
513 bool analyzeCompare(const MachineInstr &MI, unsigned &SrcReg,
514 unsigned &SrcReg2, int &CmpMask,
515 int &CmpValue) const override;
517 /// optimizeCompareInstr - Check if there exists an earlier instruction that
518 /// operates on the same source operands and sets flags in the same way as
519 /// Compare; remove Compare if possible.
520 bool optimizeCompareInstr(MachineInstr &CmpInstr, unsigned SrcReg,
521 unsigned SrcReg2, int CmpMask, int CmpValue,
522 const MachineRegisterInfo *MRI) const override;
524 /// optimizeLoadInstr - Try to remove the load by folding it to a register
525 /// operand at the use. We fold the load instructions if and only if the
526 /// def and use are in the same BB. We only look at one load and see
527 /// whether it can be folded into MI. FoldAsLoadDefReg is the virtual register
528 /// defined by the load we are trying to fold. DefMI returns the machine
529 /// instruction that defines FoldAsLoadDefReg, and the function returns
530 /// the machine instruction generated due to folding.
531 MachineInstr *optimizeLoadInstr(MachineInstr &MI,
532 const MachineRegisterInfo *MRI,
533 unsigned &FoldAsLoadDefReg,
534 MachineInstr *&DefMI) const override;
536 std::pair<unsigned, unsigned>
537 decomposeMachineOperandsTargetFlags(unsigned TF) const override;
539 ArrayRef<std::pair<unsigned, const char *>>
540 getSerializableDirectMachineOperandTargetFlags() const override;
542 bool isTailCall(const MachineInstr &Inst) const override;
545 /// Commutes the operands in the given instruction by changing the operands
546 /// order and/or changing the instruction's opcode and/or the immediate value
549 /// The arguments 'CommuteOpIdx1' and 'CommuteOpIdx2' specify the operands
552 /// Do not call this method for a non-commutable instruction or
553 /// non-commutable operands.
554 /// Even though the instruction is commutable, the method may still
555 /// fail to commute the operands, null pointer is returned in such cases.
556 MachineInstr *commuteInstructionImpl(MachineInstr &MI, bool NewMI,
557 unsigned CommuteOpIdx1,
558 unsigned CommuteOpIdx2) const override;
561 MachineInstr *convertToThreeAddressWithLEA(unsigned MIOpc,
562 MachineFunction::iterator &MFI,
564 LiveVariables *LV) const;
566 /// Handles memory folding for special case instructions, for instance those
567 /// requiring custom manipulation of the address.
568 MachineInstr *foldMemoryOperandCustom(MachineFunction &MF, MachineInstr &MI,
570 ArrayRef<MachineOperand> MOs,
571 MachineBasicBlock::iterator InsertPt,
572 unsigned Size, unsigned Align) const;
574 /// isFrameOperand - Return true and the FrameIndex if the specified
575 /// operand and follow operands form a reference to the stack frame.
576 bool isFrameOperand(const MachineInstr &MI, unsigned int Op,
577 int &FrameIndex) const;
579 /// Returns true iff the routine could find two commutable operands in the
580 /// given machine instruction with 3 vector inputs.
581 /// The 'SrcOpIdx1' and 'SrcOpIdx2' are INPUT and OUTPUT arguments. Their
582 /// input values can be re-defined in this method only if the input values
583 /// are not pre-defined, which is designated by the special value
584 /// 'CommuteAnyOperandIndex' assigned to it.
585 /// If both of indices are pre-defined and refer to some operands, then the
586 /// method simply returns true if the corresponding operands are commutable
587 /// and returns false otherwise.
589 /// For example, calling this method this way:
590 /// unsigned Op1 = 1, Op2 = CommuteAnyOperandIndex;
591 /// findThreeSrcCommutedOpIndices(MI, Op1, Op2);
592 /// can be interpreted as a query asking to find an operand that would be
593 /// commutable with the operand#1.
594 bool findThreeSrcCommutedOpIndices(const MachineInstr &MI,
596 unsigned &SrcOpIdx2) const;
599 } // End llvm namespace