1 //===- ARMISelLowering.h - ARM DAG Lowering Interface -----------*- 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 defines the interfaces that ARM uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_LIB_TARGET_ARM_ARMISELLOWERING_H
16 #define LLVM_LIB_TARGET_ARM_ARMISELLOWERING_H
18 #include "MCTargetDesc/ARMBaseInfo.h"
19 #include "llvm/ADT/SmallVector.h"
20 #include "llvm/ADT/StringRef.h"
21 #include "llvm/CodeGen/CallingConvLower.h"
22 #include "llvm/CodeGen/ISDOpcodes.h"
23 #include "llvm/CodeGen/MachineFunction.h"
24 #include "llvm/CodeGen/SelectionDAGNodes.h"
25 #include "llvm/CodeGen/TargetLowering.h"
26 #include "llvm/CodeGen/ValueTypes.h"
27 #include "llvm/IR/Attributes.h"
28 #include "llvm/IR/CallingConv.h"
29 #include "llvm/IR/Function.h"
30 #include "llvm/IR/IRBuilder.h"
31 #include "llvm/IR/InlineAsm.h"
32 #include "llvm/Support/CodeGen.h"
33 #include "llvm/Support/MachineValueType.h"
41 class FunctionLoweringInfo;
43 class InstrItineraryData;
45 class MachineBasicBlock;
48 class TargetLibraryInfo;
50 class TargetRegisterInfo;
55 // ARM Specific DAG Nodes
56 enum NodeType : unsigned {
57 // Start the numbering where the builtin ops and target ops leave off.
58 FIRST_NUMBER = ISD::BUILTIN_OP_END,
60 Wrapper, // Wrapper - A wrapper node for TargetConstantPool,
61 // TargetExternalSymbol, and TargetGlobalAddress.
62 WrapperPIC, // WrapperPIC - A wrapper node for TargetGlobalAddress in
64 WrapperJT, // WrapperJT - A wrapper node for TargetJumpTable
66 // Add pseudo op to model memcpy for struct byval.
69 CALL, // Function call.
70 CALL_PRED, // Function call that's predicable.
71 CALL_NOLINK, // Function call with branch not branch-and-link.
72 BRCOND, // Conditional branch.
73 BR_JT, // Jumptable branch.
74 BR2_JT, // Jumptable branch (2 level - jumptable entry is a jump).
75 RET_FLAG, // Return with a flag operand.
76 INTRET_FLAG, // Interrupt return with an LR-offset and a flag operand.
78 PIC_ADD, // Add with a PC operand and a PIC label.
80 CMP, // ARM compare instructions.
81 CMN, // ARM CMN instructions.
82 CMPZ, // ARM compare that sets only Z flag.
83 CMPFP, // ARM VFP compare instruction, sets FPSCR.
84 CMPFPw0, // ARM VFP compare against zero instruction, sets FPSCR.
85 FMSTAT, // ARM fmstat instruction.
87 CMOV, // ARM conditional move instructions.
88 SUBS, // Flag-setting subtraction.
90 SSAT, // Signed saturation
91 USAT, // Unsigned saturation
95 SRL_FLAG, // V,Flag = srl_flag X -> srl X, 1 + save carry out.
96 SRA_FLAG, // V,Flag = sra_flag X -> sra X, 1 + save carry out.
97 RRX, // V = RRX X, Flag -> srl X, 1 + shift in carry flag.
99 ADDC, // Add with carry
100 ADDE, // Add using carry
101 SUBC, // Sub with carry
102 SUBE, // Sub using carry
104 VMOVRRD, // double to two gprs.
105 VMOVDRR, // Two gprs to double.
106 VMOVSR, // move gpr to single, used for f32 literal constructed in a gpr
108 EH_SJLJ_SETJMP, // SjLj exception handling setjmp.
109 EH_SJLJ_LONGJMP, // SjLj exception handling longjmp.
110 EH_SJLJ_SETUP_DISPATCH, // SjLj exception handling setup_dispatch.
112 TC_RETURN, // Tail call return pseudo.
116 DYN_ALLOC, // Dynamic allocation on the stack.
118 MEMBARRIER_MCR, // Memory barrier (MCR)
122 WIN__CHKSTK, // Windows' __chkstk call to do stack probing.
123 WIN__DBZCHK, // Windows' divide by zero check
125 VCEQ, // Vector compare equal.
126 VCEQZ, // Vector compare equal to zero.
127 VCGE, // Vector compare greater than or equal.
128 VCGEZ, // Vector compare greater than or equal to zero.
129 VCLEZ, // Vector compare less than or equal to zero.
130 VCGEU, // Vector compare unsigned greater than or equal.
131 VCGT, // Vector compare greater than.
132 VCGTZ, // Vector compare greater than zero.
133 VCLTZ, // Vector compare less than zero.
134 VCGTU, // Vector compare unsigned greater than.
135 VTST, // Vector test bits.
137 // Vector shift by immediate:
139 VSHRs, // ...right (signed)
140 VSHRu, // ...right (unsigned)
142 // Vector rounding shift by immediate:
143 VRSHRs, // ...right (signed)
144 VRSHRu, // ...right (unsigned)
145 VRSHRN, // ...right narrow
147 // Vector saturating shift by immediate:
148 VQSHLs, // ...left (signed)
149 VQSHLu, // ...left (unsigned)
150 VQSHLsu, // ...left (signed to unsigned)
151 VQSHRNs, // ...right narrow (signed)
152 VQSHRNu, // ...right narrow (unsigned)
153 VQSHRNsu, // ...right narrow (signed to unsigned)
155 // Vector saturating rounding shift by immediate:
156 VQRSHRNs, // ...right narrow (signed)
157 VQRSHRNu, // ...right narrow (unsigned)
158 VQRSHRNsu, // ...right narrow (signed to unsigned)
160 // Vector shift and insert:
164 // Vector get lane (VMOV scalar to ARM core register)
165 // (These are used for 8- and 16-bit element types only.)
166 VGETLANEu, // zero-extend vector extract element
167 VGETLANEs, // sign-extend vector extract element
169 // Vector move immediate and move negated immediate:
173 // Vector move f32 immediate:
176 // Move H <-> R, clearing top 16 bits
186 VREV64, // reverse elements within 64-bit doublewords
187 VREV32, // reverse elements within 32-bit words
188 VREV16, // reverse elements within 16-bit halfwords
189 VZIP, // zip (interleave)
190 VUZP, // unzip (deinterleave)
192 VTBL1, // 1-register shuffle with mask
193 VTBL2, // 2-register shuffle with mask
195 // Vector multiply long:
197 VMULLu, // ...unsigned
199 SMULWB, // Signed multiply word by half word, bottom
200 SMULWT, // Signed multiply word by half word, top
201 UMLAL, // 64bit Unsigned Accumulate Multiply
202 SMLAL, // 64bit Signed Accumulate Multiply
203 UMAAL, // 64-bit Unsigned Accumulate Accumulate Multiply
204 SMLALBB, // 64-bit signed accumulate multiply bottom, bottom 16
205 SMLALBT, // 64-bit signed accumulate multiply bottom, top 16
206 SMLALTB, // 64-bit signed accumulate multiply top, bottom 16
207 SMLALTT, // 64-bit signed accumulate multiply top, top 16
208 SMLALD, // Signed multiply accumulate long dual
209 SMLALDX, // Signed multiply accumulate long dual exchange
210 SMLSLD, // Signed multiply subtract long dual
211 SMLSLDX, // Signed multiply subtract long dual exchange
212 SMMLAR, // Signed multiply long, round and add
213 SMMLSR, // Signed multiply long, subtract and round
215 // Operands of the standard BUILD_VECTOR node are not legalized, which
216 // is fine if BUILD_VECTORs are always lowered to shuffles or other
217 // operations, but for ARM some BUILD_VECTORs are legal as-is and their
218 // operands need to be legalized. Define an ARM-specific version of
219 // BUILD_VECTOR for this purpose.
225 // Vector OR with immediate
227 // Vector AND with NOT of immediate
230 // Vector bitwise select
233 // Pseudo-instruction representing a memory copy using ldm/stm
237 // Vector load N-element structure to all lanes:
238 VLD1DUP = ISD::FIRST_TARGET_MEMORY_OPCODE,
243 // NEON loads with post-increment base updates:
256 // NEON stores with post-increment base updates:
266 } // end namespace ARMISD
268 /// Define some predicates that are used for node matching.
271 bool isBitFieldInvertedMask(unsigned v);
273 } // end namespace ARM
275 //===--------------------------------------------------------------------===//
276 // ARMTargetLowering - ARM Implementation of the TargetLowering interface
278 class ARMTargetLowering : public TargetLowering {
280 explicit ARMTargetLowering(const TargetMachine &TM,
281 const ARMSubtarget &STI);
283 unsigned getJumpTableEncoding() const override;
284 bool useSoftFloat() const override;
286 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
288 /// ReplaceNodeResults - Replace the results of node with an illegal result
289 /// type with new values built out of custom code.
290 void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
291 SelectionDAG &DAG) const override;
293 const char *getTargetNodeName(unsigned Opcode) const override;
295 bool isSelectSupported(SelectSupportKind Kind) const override {
296 // ARM does not support scalar condition selects on vectors.
297 return (Kind != ScalarCondVectorVal);
300 bool isReadOnly(const GlobalValue *GV) const;
302 /// getSetCCResultType - Return the value type to use for ISD::SETCC.
303 EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
304 EVT VT) const override;
307 EmitInstrWithCustomInserter(MachineInstr &MI,
308 MachineBasicBlock *MBB) const override;
310 void AdjustInstrPostInstrSelection(MachineInstr &MI,
311 SDNode *Node) const override;
313 SDValue PerformCMOVCombine(SDNode *N, SelectionDAG &DAG) const;
314 SDValue PerformBRCONDCombine(SDNode *N, SelectionDAG &DAG) const;
315 SDValue PerformCMOVToBFICombine(SDNode *N, SelectionDAG &DAG) const;
316 SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
318 bool isDesirableToTransformToIntegerOp(unsigned Opc, EVT VT) const override;
320 /// allowsMisalignedMemoryAccesses - Returns true if the target allows
321 /// unaligned memory accesses of the specified type. Returns whether it
322 /// is "fast" by reference in the second argument.
323 bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AddrSpace,
325 bool *Fast) const override;
327 EVT getOptimalMemOpType(uint64_t Size,
328 unsigned DstAlign, unsigned SrcAlign,
329 bool IsMemset, bool ZeroMemset,
331 MachineFunction &MF) const override;
333 bool isTruncateFree(Type *SrcTy, Type *DstTy) const override;
334 bool isTruncateFree(EVT SrcVT, EVT DstVT) const override;
335 bool isZExtFree(SDValue Val, EVT VT2) const override;
336 bool isFNegFree(EVT VT) const override;
338 bool isVectorLoadExtDesirable(SDValue ExtVal) const override;
340 bool allowTruncateForTailCall(Type *Ty1, Type *Ty2) const override;
343 /// isLegalAddressingMode - Return true if the addressing mode represented
344 /// by AM is legal for this target, for a load/store of the specified type.
345 bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM,
346 Type *Ty, unsigned AS,
347 Instruction *I = nullptr) const override;
349 /// getScalingFactorCost - Return the cost of the scaling used in
350 /// addressing mode represented by AM.
351 /// If the AM is supported, the return value must be >= 0.
352 /// If the AM is not supported, the return value must be negative.
353 int getScalingFactorCost(const DataLayout &DL, const AddrMode &AM, Type *Ty,
354 unsigned AS) const override;
356 bool isLegalT2ScaledAddressingMode(const AddrMode &AM, EVT VT) const;
358 /// Returns true if the addresing mode representing by AM is legal
359 /// for the Thumb1 target, for a load/store of the specified type.
360 bool isLegalT1ScaledAddressingMode(const AddrMode &AM, EVT VT) const;
362 /// isLegalICmpImmediate - Return true if the specified immediate is legal
363 /// icmp immediate, that is the target has icmp instructions which can
364 /// compare a register against the immediate without having to materialize
365 /// the immediate into a register.
366 bool isLegalICmpImmediate(int64_t Imm) const override;
368 /// isLegalAddImmediate - Return true if the specified immediate is legal
369 /// add immediate, that is the target has add instructions which can
370 /// add a register and the immediate without having to materialize
371 /// the immediate into a register.
372 bool isLegalAddImmediate(int64_t Imm) const override;
374 /// getPreIndexedAddressParts - returns true by value, base pointer and
375 /// offset pointer and addressing mode by reference if the node's address
376 /// can be legally represented as pre-indexed load / store address.
377 bool getPreIndexedAddressParts(SDNode *N, SDValue &Base, SDValue &Offset,
378 ISD::MemIndexedMode &AM,
379 SelectionDAG &DAG) const override;
381 /// getPostIndexedAddressParts - returns true by value, base pointer and
382 /// offset pointer and addressing mode by reference if this node can be
383 /// combined with a load / store to form a post-indexed load / store.
384 bool getPostIndexedAddressParts(SDNode *N, SDNode *Op, SDValue &Base,
385 SDValue &Offset, ISD::MemIndexedMode &AM,
386 SelectionDAG &DAG) const override;
388 void computeKnownBitsForTargetNode(const SDValue Op, KnownBits &Known,
389 const APInt &DemandedElts,
390 const SelectionDAG &DAG,
391 unsigned Depth) const override;
393 bool targetShrinkDemandedConstant(SDValue Op, const APInt &Demanded,
394 TargetLoweringOpt &TLO) const override;
397 bool ExpandInlineAsm(CallInst *CI) const override;
399 ConstraintType getConstraintType(StringRef Constraint) const override;
401 /// Examine constraint string and operand type and determine a weight value.
402 /// The operand object must already have been set up with the operand type.
403 ConstraintWeight getSingleConstraintMatchWeight(
404 AsmOperandInfo &info, const char *constraint) const override;
406 std::pair<unsigned, const TargetRegisterClass *>
407 getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
408 StringRef Constraint, MVT VT) const override;
410 const char *LowerXConstraint(EVT ConstraintVT) const override;
412 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
413 /// vector. If it is invalid, don't add anything to Ops. If hasMemory is
414 /// true it means one of the asm constraint of the inline asm instruction
415 /// being processed is 'm'.
416 void LowerAsmOperandForConstraint(SDValue Op, std::string &Constraint,
417 std::vector<SDValue> &Ops,
418 SelectionDAG &DAG) const override;
421 getInlineAsmMemConstraint(StringRef ConstraintCode) const override {
422 if (ConstraintCode == "Q")
423 return InlineAsm::Constraint_Q;
424 else if (ConstraintCode == "o")
425 return InlineAsm::Constraint_o;
426 else if (ConstraintCode.size() == 2) {
427 if (ConstraintCode[0] == 'U') {
428 switch(ConstraintCode[1]) {
432 return InlineAsm::Constraint_Um;
434 return InlineAsm::Constraint_Un;
436 return InlineAsm::Constraint_Uq;
438 return InlineAsm::Constraint_Us;
440 return InlineAsm::Constraint_Ut;
442 return InlineAsm::Constraint_Uv;
444 return InlineAsm::Constraint_Uy;
448 return TargetLowering::getInlineAsmMemConstraint(ConstraintCode);
451 const ARMSubtarget* getSubtarget() const {
455 /// getRegClassFor - Return the register class that should be used for the
456 /// specified value type.
457 const TargetRegisterClass *getRegClassFor(MVT VT) const override;
459 /// Returns true if a cast between SrcAS and DestAS is a noop.
460 bool isNoopAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const override {
461 // Addrspacecasts are always noops.
465 bool shouldAlignPointerArgs(CallInst *CI, unsigned &MinSize,
466 unsigned &PrefAlign) const override;
468 /// createFastISel - This method returns a target specific FastISel object,
469 /// or null if the target does not support "fast" ISel.
470 FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
471 const TargetLibraryInfo *libInfo) const override;
473 Sched::Preference getSchedulingPreference(SDNode *N) const override;
476 isShuffleMaskLegal(ArrayRef<int> M, EVT VT) const override;
477 bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
479 /// isFPImmLegal - Returns true if the target can instruction select the
480 /// specified FP immediate natively. If false, the legalizer will
481 /// materialize the FP immediate as a load from a constant pool.
482 bool isFPImmLegal(const APFloat &Imm, EVT VT) const override;
484 bool getTgtMemIntrinsic(IntrinsicInfo &Info,
487 unsigned Intrinsic) const override;
489 /// Returns true if it is beneficial to convert a load of a constant
490 /// to just the constant itself.
491 bool shouldConvertConstantLoadToIntImm(const APInt &Imm,
492 Type *Ty) const override;
494 /// Return true if EXTRACT_SUBVECTOR is cheap for this result type
496 bool isExtractSubvectorCheap(EVT ResVT, EVT SrcVT,
497 unsigned Index) const override;
499 /// Returns true if an argument of type Ty needs to be passed in a
500 /// contiguous block of registers in calling convention CallConv.
501 bool functionArgumentNeedsConsecutiveRegisters(
502 Type *Ty, CallingConv::ID CallConv, bool isVarArg) const override;
504 /// If a physical register, this returns the register that receives the
505 /// exception address on entry to an EH pad.
507 getExceptionPointerRegister(const Constant *PersonalityFn) const override;
509 /// If a physical register, this returns the register that receives the
510 /// exception typeid on entry to a landing pad.
512 getExceptionSelectorRegister(const Constant *PersonalityFn) const override;
514 Instruction *makeDMB(IRBuilder<> &Builder, ARM_MB::MemBOpt Domain) const;
515 Value *emitLoadLinked(IRBuilder<> &Builder, Value *Addr,
516 AtomicOrdering Ord) const override;
517 Value *emitStoreConditional(IRBuilder<> &Builder, Value *Val,
518 Value *Addr, AtomicOrdering Ord) const override;
520 void emitAtomicCmpXchgNoStoreLLBalance(IRBuilder<> &Builder) const override;
522 Instruction *emitLeadingFence(IRBuilder<> &Builder, Instruction *Inst,
523 AtomicOrdering Ord) const override;
524 Instruction *emitTrailingFence(IRBuilder<> &Builder, Instruction *Inst,
525 AtomicOrdering Ord) const override;
527 unsigned getMaxSupportedInterleaveFactor() const override { return 4; }
529 bool lowerInterleavedLoad(LoadInst *LI,
530 ArrayRef<ShuffleVectorInst *> Shuffles,
531 ArrayRef<unsigned> Indices,
532 unsigned Factor) const override;
533 bool lowerInterleavedStore(StoreInst *SI, ShuffleVectorInst *SVI,
534 unsigned Factor) const override;
536 bool shouldInsertFencesForAtomic(const Instruction *I) const override;
537 TargetLoweringBase::AtomicExpansionKind
538 shouldExpandAtomicLoadInIR(LoadInst *LI) const override;
539 bool shouldExpandAtomicStoreInIR(StoreInst *SI) const override;
540 TargetLoweringBase::AtomicExpansionKind
541 shouldExpandAtomicRMWInIR(AtomicRMWInst *AI) const override;
542 TargetLoweringBase::AtomicExpansionKind
543 shouldExpandAtomicCmpXchgInIR(AtomicCmpXchgInst *AI) const override;
545 bool useLoadStackGuardNode() const override;
547 bool canCombineStoreAndExtract(Type *VectorTy, Value *Idx,
548 unsigned &Cost) const override;
550 bool canMergeStoresTo(unsigned AddressSpace, EVT MemVT,
551 const SelectionDAG &DAG) const override {
552 // Do not merge to larger than i32.
553 return (MemVT.getSizeInBits() <= 32);
556 bool isCheapToSpeculateCttz() const override;
557 bool isCheapToSpeculateCtlz() const override;
559 bool convertSetCCLogicToBitwiseLogic(EVT VT) const override {
560 return VT.isScalarInteger();
563 bool supportSwiftError() const override {
567 bool hasStandaloneRem(EVT VT) const override {
568 return HasStandaloneRem;
571 CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool isVarArg) const;
572 CCAssignFn *CCAssignFnForReturn(CallingConv::ID CC, bool isVarArg) const;
574 /// Returns true if \p VecTy is a legal interleaved access type. This
575 /// function checks the vector element type and the overall width of the
577 bool isLegalInterleavedAccessType(VectorType *VecTy,
578 const DataLayout &DL) const;
580 bool alignLoopsWithOptSize() const override;
582 /// Returns the number of interleaved accesses that will be generated when
583 /// lowering accesses of the given type.
584 unsigned getNumInterleavedAccesses(VectorType *VecTy,
585 const DataLayout &DL) const;
587 void finalizeLowering(MachineFunction &MF) const override;
589 /// Return the correct alignment for the current calling convention.
590 unsigned getABIAlignmentForCallingConv(Type *ArgTy,
591 DataLayout DL) const override;
593 bool isDesirableToCommuteWithShift(const SDNode *N,
594 CombineLevel Level) const override;
596 bool shouldFoldShiftPairToMask(const SDNode *N,
597 CombineLevel Level) const override;
599 std::pair<const TargetRegisterClass *, uint8_t>
600 findRepresentativeClass(const TargetRegisterInfo *TRI,
601 MVT VT) const override;
604 /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
605 /// make the right decision when generating code for different targets.
606 const ARMSubtarget *Subtarget;
608 const TargetRegisterInfo *RegInfo;
610 const InstrItineraryData *Itins;
612 /// ARMPCLabelIndex - Keep track of the number of ARM PC labels created.
613 unsigned ARMPCLabelIndex;
615 // TODO: remove this, and have shouldInsertFencesForAtomic do the proper
617 bool InsertFencesForAtomic;
619 bool HasStandaloneRem = true;
621 void addTypeForNEON(MVT VT, MVT PromotedLdStVT, MVT PromotedBitwiseVT);
622 void addDRTypeForNEON(MVT VT);
623 void addQRTypeForNEON(MVT VT);
624 std::pair<SDValue, SDValue> getARMXALUOOp(SDValue Op, SelectionDAG &DAG, SDValue &ARMcc) const;
626 using RegsToPassVector = SmallVector<std::pair<unsigned, SDValue>, 8>;
628 void PassF64ArgInRegs(const SDLoc &dl, SelectionDAG &DAG, SDValue Chain,
629 SDValue &Arg, RegsToPassVector &RegsToPass,
630 CCValAssign &VA, CCValAssign &NextVA,
632 SmallVectorImpl<SDValue> &MemOpChains,
633 ISD::ArgFlagsTy Flags) const;
634 SDValue GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
635 SDValue &Root, SelectionDAG &DAG,
636 const SDLoc &dl) const;
638 CallingConv::ID getEffectiveCallingConv(CallingConv::ID CC,
639 bool isVarArg) const;
640 CCAssignFn *CCAssignFnForNode(CallingConv::ID CC, bool Return,
641 bool isVarArg) const;
642 SDValue LowerMemOpCallTo(SDValue Chain, SDValue StackPtr, SDValue Arg,
643 const SDLoc &dl, SelectionDAG &DAG,
644 const CCValAssign &VA,
645 ISD::ArgFlagsTy Flags) const;
646 SDValue LowerEH_SJLJ_SETJMP(SDValue Op, SelectionDAG &DAG) const;
647 SDValue LowerEH_SJLJ_LONGJMP(SDValue Op, SelectionDAG &DAG) const;
648 SDValue LowerEH_SJLJ_SETUP_DISPATCH(SDValue Op, SelectionDAG &DAG) const;
649 SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG,
650 const ARMSubtarget *Subtarget) const;
651 SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
652 SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
653 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
654 SDValue LowerGlobalAddressDarwin(SDValue Op, SelectionDAG &DAG) const;
655 SDValue LowerGlobalAddressELF(SDValue Op, SelectionDAG &DAG) const;
656 SDValue LowerGlobalAddressWindows(SDValue Op, SelectionDAG &DAG) const;
657 SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
658 SDValue LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
659 SelectionDAG &DAG) const;
660 SDValue LowerToTLSExecModels(GlobalAddressSDNode *GA,
662 TLSModel::Model model) const;
663 SDValue LowerGlobalTLSAddressDarwin(SDValue Op, SelectionDAG &DAG) const;
664 SDValue LowerGlobalTLSAddressWindows(SDValue Op, SelectionDAG &DAG) const;
665 SDValue LowerGLOBAL_OFFSET_TABLE(SDValue Op, SelectionDAG &DAG) const;
666 SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
667 SDValue LowerSignedALUO(SDValue Op, SelectionDAG &DAG) const;
668 SDValue LowerUnsignedALUO(SDValue Op, SelectionDAG &DAG) const;
669 SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
670 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
671 SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) const;
672 SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
673 SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const;
674 SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
675 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
676 SDValue LowerShiftRightParts(SDValue Op, SelectionDAG &DAG) const;
677 SDValue LowerShiftLeftParts(SDValue Op, SelectionDAG &DAG) const;
678 SDValue LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG) const;
679 SDValue LowerConstantFP(SDValue Op, SelectionDAG &DAG,
680 const ARMSubtarget *ST) const;
681 SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG,
682 const ARMSubtarget *ST) const;
683 SDValue LowerFSINCOS(SDValue Op, SelectionDAG &DAG) const;
684 SDValue LowerDivRem(SDValue Op, SelectionDAG &DAG) const;
685 SDValue LowerDIV_Windows(SDValue Op, SelectionDAG &DAG, bool Signed) const;
686 void ExpandDIV_Windows(SDValue Op, SelectionDAG &DAG, bool Signed,
687 SmallVectorImpl<SDValue> &Results) const;
688 SDValue LowerWindowsDIVLibCall(SDValue Op, SelectionDAG &DAG, bool Signed,
689 SDValue &Chain) const;
690 SDValue LowerREM(SDNode *N, SelectionDAG &DAG) const;
691 SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const;
692 SDValue LowerFP_ROUND(SDValue Op, SelectionDAG &DAG) const;
693 SDValue LowerFP_EXTEND(SDValue Op, SelectionDAG &DAG) const;
694 SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) const;
695 SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
697 unsigned getRegisterByName(const char* RegName, EVT VT,
698 SelectionDAG &DAG) const override;
700 SDValue BuildSDIVPow2(SDNode *N, const APInt &Divisor, SelectionDAG &DAG,
701 SmallVectorImpl<SDNode *> &Created) const override;
703 /// isFMAFasterThanFMulAndFAdd - Return true if an FMA operation is faster
704 /// than a pair of fmul and fadd instructions. fmuladd intrinsics will be
705 /// expanded to FMAs when this method returns true, otherwise fmuladd is
706 /// expanded to fmul + fadd.
708 /// ARM supports both fused and unfused multiply-add operations; we already
709 /// lower a pair of fmul and fadd to the latter so it's not clear that there
710 /// would be a gain or that the gain would be worthwhile enough to risk
711 /// correctness bugs.
712 bool isFMAFasterThanFMulAndFAdd(EVT VT) const override { return false; }
714 SDValue ReconstructShuffle(SDValue Op, SelectionDAG &DAG) const;
716 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
717 CallingConv::ID CallConv, bool isVarArg,
718 const SmallVectorImpl<ISD::InputArg> &Ins,
719 const SDLoc &dl, SelectionDAG &DAG,
720 SmallVectorImpl<SDValue> &InVals, bool isThisReturn,
721 SDValue ThisVal) const;
723 bool supportSplitCSR(MachineFunction *MF) const override {
724 return MF->getFunction().getCallingConv() == CallingConv::CXX_FAST_TLS &&
725 MF->getFunction().hasFnAttribute(Attribute::NoUnwind);
728 void initializeSplitCSR(MachineBasicBlock *Entry) const override;
729 void insertCopiesSplitCSR(
730 MachineBasicBlock *Entry,
731 const SmallVectorImpl<MachineBasicBlock *> &Exits) const override;
734 LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
735 const SmallVectorImpl<ISD::InputArg> &Ins,
736 const SDLoc &dl, SelectionDAG &DAG,
737 SmallVectorImpl<SDValue> &InVals) const override;
739 int StoreByValRegs(CCState &CCInfo, SelectionDAG &DAG, const SDLoc &dl,
740 SDValue &Chain, const Value *OrigArg,
741 unsigned InRegsParamRecordIdx, int ArgOffset,
742 unsigned ArgSize) const;
744 void VarArgStyleRegisters(CCState &CCInfo, SelectionDAG &DAG,
745 const SDLoc &dl, SDValue &Chain,
746 unsigned ArgOffset, unsigned TotalArgRegsSaveSize,
747 bool ForceMutable = false) const;
749 SDValue LowerCall(TargetLowering::CallLoweringInfo &CLI,
750 SmallVectorImpl<SDValue> &InVals) const override;
752 /// HandleByVal - Target-specific cleanup for ByVal support.
753 void HandleByVal(CCState *, unsigned &, unsigned) const override;
755 /// IsEligibleForTailCallOptimization - Check whether the call is eligible
756 /// for tail call optimization. Targets which want to do tail call
757 /// optimization should implement this function.
758 bool IsEligibleForTailCallOptimization(SDValue Callee,
759 CallingConv::ID CalleeCC,
761 bool isCalleeStructRet,
762 bool isCallerStructRet,
763 const SmallVectorImpl<ISD::OutputArg> &Outs,
764 const SmallVectorImpl<SDValue> &OutVals,
765 const SmallVectorImpl<ISD::InputArg> &Ins,
766 SelectionDAG& DAG) const;
768 bool CanLowerReturn(CallingConv::ID CallConv,
769 MachineFunction &MF, bool isVarArg,
770 const SmallVectorImpl<ISD::OutputArg> &Outs,
771 LLVMContext &Context) const override;
773 SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
774 const SmallVectorImpl<ISD::OutputArg> &Outs,
775 const SmallVectorImpl<SDValue> &OutVals,
776 const SDLoc &dl, SelectionDAG &DAG) const override;
778 bool isUsedByReturnOnly(SDNode *N, SDValue &Chain) const override;
780 bool mayBeEmittedAsTailCall(const CallInst *CI) const override;
782 bool shouldConsiderGEPOffsetSplit() const override { return true; }
784 SDValue getCMOV(const SDLoc &dl, EVT VT, SDValue FalseVal, SDValue TrueVal,
785 SDValue ARMcc, SDValue CCR, SDValue Cmp,
786 SelectionDAG &DAG) const;
787 SDValue getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
788 SDValue &ARMcc, SelectionDAG &DAG, const SDLoc &dl) const;
789 SDValue getVFPCmp(SDValue LHS, SDValue RHS, SelectionDAG &DAG,
790 const SDLoc &dl, bool InvalidOnQNaN) const;
791 SDValue duplicateCmp(SDValue Cmp, SelectionDAG &DAG) const;
793 SDValue OptimizeVFPBrcond(SDValue Op, SelectionDAG &DAG) const;
795 void SetupEntryBlockForSjLj(MachineInstr &MI, MachineBasicBlock *MBB,
796 MachineBasicBlock *DispatchBB, int FI) const;
798 void EmitSjLjDispatchBlock(MachineInstr &MI, MachineBasicBlock *MBB) const;
800 bool RemapAddSubWithFlags(MachineInstr &MI, MachineBasicBlock *BB) const;
802 MachineBasicBlock *EmitStructByval(MachineInstr &MI,
803 MachineBasicBlock *MBB) const;
805 MachineBasicBlock *EmitLowered__chkstk(MachineInstr &MI,
806 MachineBasicBlock *MBB) const;
807 MachineBasicBlock *EmitLowered__dbzchk(MachineInstr &MI,
808 MachineBasicBlock *MBB) const;
811 enum NEONModImmType {
819 FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
820 const TargetLibraryInfo *libInfo);
822 } // end namespace ARM
824 } // end namespace llvm
826 #endif // LLVM_LIB_TARGET_ARM_ARMISELLOWERING_H