1 //===-- MipsISelLowering.h - Mips 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 Mips uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_LIB_TARGET_MIPS_MIPSISELLOWERING_H
16 #define LLVM_LIB_TARGET_MIPS_MIPSISELLOWERING_H
18 #include "MCTargetDesc/MipsBaseInfo.h"
20 #include "llvm/CodeGen/CallingConvLower.h"
21 #include "llvm/CodeGen/SelectionDAG.h"
22 #include "llvm/IR/Function.h"
23 #include "llvm/Target/TargetLowering.h"
30 // Start the numbering from where ISD NodeType finishes.
31 FIRST_NUMBER = ISD::BUILTIN_OP_END,
33 // Jump and link (call)
39 // Get the Higher 16 bits from a 32-bit immediate
40 // No relation with Mips Hi register
43 // Get the Lower 16 bits from a 32-bit immediate
44 // No relation with Mips Lo register
47 // Handle gp_rel (small data/bss sections) relocation.
53 // Floating Point Branch Conditional
56 // Floating Point Compare
59 // Floating Point Conditional Moves
63 // FP-to-int truncation node.
71 // Node used to extract integer from accumulator.
75 // Node used to insert integers to accumulator.
106 // EXTR.W instrinsic nodes.
116 // DPA.W intrinsic nodes.
152 // DSP setcc and select_cc nodes.
156 // Vector comparisons.
157 // These take a vector and return a boolean.
163 // These take a vector and return a vector bitmask.
170 // Element-wise vector max/min.
176 // Vector Shuffle with mask as an operand
177 VSHF, // Generic shuffle
178 SHF, // 4-element set shuffle.
179 ILVEV, // Interleave even elements
180 ILVOD, // Interleave odd elements
181 ILVL, // Interleave left elements
182 ILVR, // Interleave right elements
183 PCKEV, // Pack even elements
184 PCKOD, // Pack odd elements
187 INSVE, // Copy element from one vector to another
189 // Combined (XOR (OR $a, $b), -1)
192 // Extended vector element extraction
196 // Load/Store Left/Right nodes.
197 LWL = ISD::FIRST_TARGET_MEMORY_OPCODE,
208 //===--------------------------------------------------------------------===//
209 // TargetLowering Implementation
210 //===--------------------------------------------------------------------===//
211 class MipsFunctionInfo;
214 class MipsTargetLowering : public TargetLowering {
217 explicit MipsTargetLowering(MipsTargetMachine &TM,
218 const MipsSubtarget &STI);
220 static const MipsTargetLowering *create(MipsTargetMachine &TM,
221 const MipsSubtarget &STI);
223 /// createFastISel - This method returns a target specific FastISel object,
224 /// or null if the target does not support "fast" ISel.
225 FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
226 const TargetLibraryInfo *libInfo) const override;
228 MVT getScalarShiftAmountTy(EVT LHSTy) const override { return MVT::i32; }
230 void LowerOperationWrapper(SDNode *N,
231 SmallVectorImpl<SDValue> &Results,
232 SelectionDAG &DAG) const override;
234 /// LowerOperation - Provide custom lowering hooks for some operations.
235 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
237 /// ReplaceNodeResults - Replace the results of node with an illegal result
238 /// type with new values built out of custom code.
240 void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
241 SelectionDAG &DAG) const override;
243 /// getTargetNodeName - This method returns the name of a target specific
245 const char *getTargetNodeName(unsigned Opcode) const override;
247 /// getSetCCResultType - get the ISD::SETCC result ValueType
248 EVT getSetCCResultType(LLVMContext &Context, EVT VT) const override;
250 SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
253 EmitInstrWithCustomInserter(MachineInstr *MI,
254 MachineBasicBlock *MBB) const override;
257 bool operator()(const char *S1, const char *S2) const {
258 return strcmp(S1, S2) < 0;
263 SDValue getGlobalReg(SelectionDAG &DAG, EVT Ty) const;
265 // This method creates the following nodes, which are necessary for
266 // computing a local symbol's address:
268 // (add (load (wrapper $gp, %got(sym)), %lo(sym))
269 template <class NodeTy>
270 SDValue getAddrLocal(NodeTy *N, EVT Ty, SelectionDAG &DAG,
271 bool IsN32OrN64) const {
273 unsigned GOTFlag = IsN32OrN64 ? MipsII::MO_GOT_PAGE : MipsII::MO_GOT;
274 SDValue GOT = DAG.getNode(MipsISD::Wrapper, DL, Ty, getGlobalReg(DAG, Ty),
275 getTargetNode(N, Ty, DAG, GOTFlag));
276 SDValue Load = DAG.getLoad(Ty, DL, DAG.getEntryNode(), GOT,
277 MachinePointerInfo::getGOT(), false, false,
279 unsigned LoFlag = IsN32OrN64 ? MipsII::MO_GOT_OFST : MipsII::MO_ABS_LO;
280 SDValue Lo = DAG.getNode(MipsISD::Lo, DL, Ty,
281 getTargetNode(N, Ty, DAG, LoFlag));
282 return DAG.getNode(ISD::ADD, DL, Ty, Load, Lo);
285 // This method creates the following nodes, which are necessary for
286 // computing a global symbol's address:
288 // (load (wrapper $gp, %got(sym)))
289 template<class NodeTy>
290 SDValue getAddrGlobal(NodeTy *N, EVT Ty, SelectionDAG &DAG,
291 unsigned Flag, SDValue Chain,
292 const MachinePointerInfo &PtrInfo) const {
294 SDValue Tgt = DAG.getNode(MipsISD::Wrapper, DL, Ty, getGlobalReg(DAG, Ty),
295 getTargetNode(N, Ty, DAG, Flag));
296 return DAG.getLoad(Ty, DL, Chain, Tgt, PtrInfo, false, false, false, 0);
299 // This method creates the following nodes, which are necessary for
300 // computing a global symbol's address in large-GOT mode:
302 // (load (wrapper (add %hi(sym), $gp), %lo(sym)))
303 template<class NodeTy>
304 SDValue getAddrGlobalLargeGOT(NodeTy *N, EVT Ty, SelectionDAG &DAG,
305 unsigned HiFlag, unsigned LoFlag,
307 const MachinePointerInfo &PtrInfo) const {
309 SDValue Hi = DAG.getNode(MipsISD::Hi, DL, Ty,
310 getTargetNode(N, Ty, DAG, HiFlag));
311 Hi = DAG.getNode(ISD::ADD, DL, Ty, Hi, getGlobalReg(DAG, Ty));
312 SDValue Wrapper = DAG.getNode(MipsISD::Wrapper, DL, Ty, Hi,
313 getTargetNode(N, Ty, DAG, LoFlag));
314 return DAG.getLoad(Ty, DL, Chain, Wrapper, PtrInfo, false, false, false,
318 // This method creates the following nodes, which are necessary for
319 // computing a symbol's address in non-PIC mode:
321 // (add %hi(sym), %lo(sym))
322 template<class NodeTy>
323 SDValue getAddrNonPIC(NodeTy *N, EVT Ty, SelectionDAG &DAG) const {
325 SDValue Hi = getTargetNode(N, Ty, DAG, MipsII::MO_ABS_HI);
326 SDValue Lo = getTargetNode(N, Ty, DAG, MipsII::MO_ABS_LO);
327 return DAG.getNode(ISD::ADD, DL, Ty,
328 DAG.getNode(MipsISD::Hi, DL, Ty, Hi),
329 DAG.getNode(MipsISD::Lo, DL, Ty, Lo));
332 /// This function fills Ops, which is the list of operands that will later
333 /// be used when a function call node is created. It also generates
334 /// copyToReg nodes to set up argument registers.
336 getOpndList(SmallVectorImpl<SDValue> &Ops,
337 std::deque< std::pair<unsigned, SDValue> > &RegsToPass,
338 bool IsPICCall, bool GlobalOrExternal, bool InternalLinkage,
339 CallLoweringInfo &CLI, SDValue Callee, SDValue Chain) const;
341 /// ByValArgInfo - Byval argument information.
342 struct ByValArgInfo {
343 unsigned FirstIdx; // Index of the first register used.
344 unsigned NumRegs; // Number of registers used for this argument.
345 unsigned Address; // Offset of the stack area used to pass this argument.
347 ByValArgInfo() : FirstIdx(0), NumRegs(0), Address(0) {}
350 /// MipsCC - This class provides methods used to analyze formal and call
351 /// arguments and inquire about calling convention information.
354 enum SpecialCallingConvType {
355 Mips16RetHelperConv, NoSpecialCallingConv
358 MipsCC(CallingConv::ID CallConv, const MipsSubtarget &Subtarget,
360 SpecialCallingConvType SpecialCallingConv = NoSpecialCallingConv);
362 void analyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
363 bool IsVarArg, bool IsSoftFloat,
364 const SDNode *CallNode,
365 std::vector<ArgListEntry> &FuncArgs);
366 void analyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
368 Function::const_arg_iterator FuncArg);
370 const CCState &getCCInfo() const { return CCInfo; }
372 /// hasByValArg - Returns true if function has byval arguments.
373 bool hasByValArg() const { return !ByValArgs.empty(); }
375 /// reservedArgArea - The size of the area the caller reserves for
376 /// register arguments. This is 16-byte if ABI is O32.
377 unsigned reservedArgArea() const;
379 /// Return pointer to array of integer argument registers.
380 const ArrayRef<MCPhysReg> intArgRegs() const;
382 typedef SmallVectorImpl<ByValArgInfo>::const_iterator byval_iterator;
383 byval_iterator byval_begin() const { return ByValArgs.begin(); }
384 byval_iterator byval_end() const { return ByValArgs.end(); }
387 void handleByValArg(unsigned ValNo, MVT ValVT, MVT LocVT,
388 CCValAssign::LocInfo LocInfo,
389 ISD::ArgFlagsTy ArgFlags);
391 /// useRegsForByval - Returns true if the calling convention allows the
392 /// use of registers to pass byval arguments.
393 bool useRegsForByval() const { return CallConv != CallingConv::Fast; }
395 /// Return the function that analyzes fixed argument list functions.
396 llvm::CCAssignFn *fixedArgFn() const;
398 /// Return the function that analyzes variable argument list functions.
399 llvm::CCAssignFn *varArgFn() const;
401 const MCPhysReg *shadowRegs() const;
403 void allocateRegs(ByValArgInfo &ByVal, unsigned ByValSize,
406 /// Return the type of the register which is used to pass an argument or
407 /// return a value. This function returns f64 if the argument is an i64
408 /// value which has been generated as a result of softening an f128 value.
409 /// Otherwise, it just returns VT.
410 MVT getRegVT(MVT VT, const Type *OrigTy, const SDNode *CallNode,
411 bool IsSoftFloat) const;
413 template<typename Ty>
414 void analyzeReturn(const SmallVectorImpl<Ty> &RetVals, bool IsSoftFloat,
415 const SDNode *CallNode, const Type *RetTy) const;
418 CallingConv::ID CallConv;
419 const MipsSubtarget &Subtarget;
420 SpecialCallingConvType SpecialCallingConv;
421 SmallVector<ByValArgInfo, 2> ByValArgs;
424 SDValue lowerLOAD(SDValue Op, SelectionDAG &DAG) const;
425 SDValue lowerSTORE(SDValue Op, SelectionDAG &DAG) const;
428 const MipsSubtarget &Subtarget;
431 // Create a TargetGlobalAddress node.
432 SDValue getTargetNode(GlobalAddressSDNode *N, EVT Ty, SelectionDAG &DAG,
433 unsigned Flag) const;
435 // Create a TargetExternalSymbol node.
436 SDValue getTargetNode(ExternalSymbolSDNode *N, EVT Ty, SelectionDAG &DAG,
437 unsigned Flag) const;
439 // Create a TargetBlockAddress node.
440 SDValue getTargetNode(BlockAddressSDNode *N, EVT Ty, SelectionDAG &DAG,
441 unsigned Flag) const;
443 // Create a TargetJumpTable node.
444 SDValue getTargetNode(JumpTableSDNode *N, EVT Ty, SelectionDAG &DAG,
445 unsigned Flag) const;
447 // Create a TargetConstantPool node.
448 SDValue getTargetNode(ConstantPoolSDNode *N, EVT Ty, SelectionDAG &DAG,
449 unsigned Flag) const;
451 MipsCC::SpecialCallingConvType getSpecialCallingConv(SDValue Callee) const;
452 // Lower Operand helpers
453 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
454 CallingConv::ID CallConv, bool isVarArg,
455 const SmallVectorImpl<ISD::InputArg> &Ins,
456 SDLoc dl, SelectionDAG &DAG,
457 SmallVectorImpl<SDValue> &InVals,
458 const SDNode *CallNode, const Type *RetTy) const;
460 // Lower Operand specifics
461 SDValue lowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
462 SDValue lowerBRCOND(SDValue Op, SelectionDAG &DAG) const;
463 SDValue lowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
464 SDValue lowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
465 SDValue lowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
466 SDValue lowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
467 SDValue lowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
468 SDValue lowerSELECT(SDValue Op, SelectionDAG &DAG) const;
469 SDValue lowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
470 SDValue lowerSETCC(SDValue Op, SelectionDAG &DAG) const;
471 SDValue lowerVASTART(SDValue Op, SelectionDAG &DAG) const;
472 SDValue lowerVAARG(SDValue Op, SelectionDAG &DAG) const;
473 SDValue lowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const;
474 SDValue lowerFABS(SDValue Op, SelectionDAG &DAG) const;
475 SDValue lowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
476 SDValue lowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
477 SDValue lowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const;
478 SDValue lowerATOMIC_FENCE(SDValue Op, SelectionDAG& DAG) const;
479 SDValue lowerShiftLeftParts(SDValue Op, SelectionDAG& DAG) const;
480 SDValue lowerShiftRightParts(SDValue Op, SelectionDAG& DAG,
482 SDValue lowerADD(SDValue Op, SelectionDAG &DAG) const;
483 SDValue lowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) const;
485 /// isEligibleForTailCallOptimization - Check whether the call is eligible
486 /// for tail call optimization.
488 isEligibleForTailCallOptimization(const MipsCC &MipsCCInfo,
489 unsigned NextStackOffset,
490 const MipsFunctionInfo& FI) const = 0;
492 /// copyByValArg - Copy argument registers which were used to pass a byval
493 /// argument to the stack. Create a stack frame object for the byval
495 void copyByValRegs(SDValue Chain, SDLoc DL,
496 std::vector<SDValue> &OutChains, SelectionDAG &DAG,
497 const ISD::ArgFlagsTy &Flags,
498 SmallVectorImpl<SDValue> &InVals,
499 const Argument *FuncArg,
500 const MipsCC &CC, const ByValArgInfo &ByVal) const;
502 /// passByValArg - Pass a byval argument in registers or on stack.
503 void passByValArg(SDValue Chain, SDLoc DL,
504 std::deque< std::pair<unsigned, SDValue> > &RegsToPass,
505 SmallVectorImpl<SDValue> &MemOpChains, SDValue StackPtr,
506 MachineFrameInfo *MFI, SelectionDAG &DAG, SDValue Arg,
507 const MipsCC &CC, const ByValArgInfo &ByVal,
508 const ISD::ArgFlagsTy &Flags, bool isLittle) const;
510 /// writeVarArgRegs - Write variable function arguments passed in registers
511 /// to the stack. Also create a stack frame object for the first variable
513 void writeVarArgRegs(std::vector<SDValue> &OutChains, const MipsCC &CC,
514 SDValue Chain, SDLoc DL, SelectionDAG &DAG) const;
517 LowerFormalArguments(SDValue Chain,
518 CallingConv::ID CallConv, bool isVarArg,
519 const SmallVectorImpl<ISD::InputArg> &Ins,
520 SDLoc dl, SelectionDAG &DAG,
521 SmallVectorImpl<SDValue> &InVals) const override;
523 SDValue passArgOnStack(SDValue StackPtr, unsigned Offset, SDValue Chain,
524 SDValue Arg, SDLoc DL, bool IsTailCall,
525 SelectionDAG &DAG) const;
527 SDValue LowerCall(TargetLowering::CallLoweringInfo &CLI,
528 SmallVectorImpl<SDValue> &InVals) const override;
530 bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
532 const SmallVectorImpl<ISD::OutputArg> &Outs,
533 LLVMContext &Context) const override;
535 SDValue LowerReturn(SDValue Chain,
536 CallingConv::ID CallConv, bool isVarArg,
537 const SmallVectorImpl<ISD::OutputArg> &Outs,
538 const SmallVectorImpl<SDValue> &OutVals,
539 SDLoc dl, SelectionDAG &DAG) const override;
541 // Inline asm support
543 getConstraintType(const std::string &Constraint) const override;
545 /// Examine constraint string and operand type and determine a weight value.
546 /// The operand object must already have been set up with the operand type.
547 ConstraintWeight getSingleConstraintMatchWeight(
548 AsmOperandInfo &info, const char *constraint) const override;
550 /// This function parses registers that appear in inline-asm constraints.
551 /// It returns pair (0, 0) on failure.
552 std::pair<unsigned, const TargetRegisterClass *>
553 parseRegForInlineAsmConstraint(StringRef C, MVT VT) const;
555 std::pair<unsigned, const TargetRegisterClass*>
556 getRegForInlineAsmConstraint(const std::string &Constraint,
557 MVT VT) const override;
559 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
560 /// vector. If it is invalid, don't add anything to Ops. If hasMemory is
561 /// true it means one of the asm constraint of the inline asm instruction
562 /// being processed is 'm'.
563 void LowerAsmOperandForConstraint(SDValue Op,
564 std::string &Constraint,
565 std::vector<SDValue> &Ops,
566 SelectionDAG &DAG) const override;
568 bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const override;
570 bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
572 EVT getOptimalMemOpType(uint64_t Size, unsigned DstAlign,
574 bool IsMemset, bool ZeroMemset,
576 MachineFunction &MF) const override;
578 /// isFPImmLegal - Returns true if the target can instruction select the
579 /// specified FP immediate natively. If false, the legalizer will
580 /// materialize the FP immediate as a load from a constant pool.
581 bool isFPImmLegal(const APFloat &Imm, EVT VT) const override;
583 unsigned getJumpTableEncoding() const override;
585 /// Emit a sign-extension using sll/sra, seb, or seh appropriately.
586 MachineBasicBlock *emitSignExtendToI32InReg(MachineInstr *MI,
587 MachineBasicBlock *BB,
588 unsigned Size, unsigned DstReg,
589 unsigned SrcRec) const;
591 MachineBasicBlock *emitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
592 unsigned Size, unsigned BinOpcode, bool Nand = false) const;
593 MachineBasicBlock *emitAtomicBinaryPartword(MachineInstr *MI,
594 MachineBasicBlock *BB, unsigned Size, unsigned BinOpcode,
595 bool Nand = false) const;
596 MachineBasicBlock *emitAtomicCmpSwap(MachineInstr *MI,
597 MachineBasicBlock *BB, unsigned Size) const;
598 MachineBasicBlock *emitAtomicCmpSwapPartword(MachineInstr *MI,
599 MachineBasicBlock *BB, unsigned Size) const;
600 MachineBasicBlock *emitSEL_D(MachineInstr *MI, MachineBasicBlock *BB) const;
603 /// Create MipsTargetLowering objects.
604 const MipsTargetLowering *
605 createMips16TargetLowering(MipsTargetMachine &TM, const MipsSubtarget &STI);
606 const MipsTargetLowering *
607 createMipsSETargetLowering(MipsTargetMachine &TM, const MipsSubtarget &STI);
610 FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
611 const TargetLibraryInfo *libInfo);