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 MipsISELLOWERING_H
16 #define MipsISELLOWERING_H
19 #include "MipsSubtarget.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.
74 // Node used to insert integers to accumulator.
105 // EXTR.W instrinsic nodes.
115 // DPA.W intrinsic nodes.
151 // DSP setcc and select_cc nodes.
155 // Vector comparisons.
156 // These take a vector and return a boolean.
162 // These take a vector and return a vector bitmask.
169 // Element-wise vector max/min.
175 // Vector Shuffle with mask as an operand
176 VSHF, // Generic shuffle
178 // Combined (XOR (OR $a, $b), -1)
181 // Extended vector element extraction
185 // Load/Store Left/Right nodes.
186 LWL = ISD::FIRST_TARGET_MEMORY_OPCODE,
197 //===--------------------------------------------------------------------===//
198 // TargetLowering Implementation
199 //===--------------------------------------------------------------------===//
200 class MipsFunctionInfo;
202 class MipsTargetLowering : public TargetLowering {
204 explicit MipsTargetLowering(MipsTargetMachine &TM);
206 static const MipsTargetLowering *create(MipsTargetMachine &TM);
208 virtual MVT getScalarShiftAmountTy(EVT LHSTy) const { return MVT::i32; }
210 virtual void LowerOperationWrapper(SDNode *N,
211 SmallVectorImpl<SDValue> &Results,
212 SelectionDAG &DAG) const;
214 /// LowerOperation - Provide custom lowering hooks for some operations.
215 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
217 /// ReplaceNodeResults - Replace the results of node with an illegal result
218 /// type with new values built out of custom code.
220 virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
221 SelectionDAG &DAG) const;
223 /// getTargetNodeName - This method returns the name of a target specific
225 virtual const char *getTargetNodeName(unsigned Opcode) const;
227 /// getSetCCResultType - get the ISD::SETCC result ValueType
228 EVT getSetCCResultType(LLVMContext &Context, EVT VT) const;
230 virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
232 virtual MachineBasicBlock *
233 EmitInstrWithCustomInserter(MachineInstr *MI, MachineBasicBlock *MBB) const;
236 bool operator()(const char *S1, const char *S2) const {
237 return strcmp(S1, S2) < 0;
242 SDValue getGlobalReg(SelectionDAG &DAG, EVT Ty) const;
244 SDValue getAddrLocal(SDValue Op, SelectionDAG &DAG, bool HasMips64) const;
246 SDValue getAddrGlobal(SDValue Op, SelectionDAG &DAG, unsigned Flag) const;
248 SDValue getAddrGlobalLargeGOT(SDValue Op, SelectionDAG &DAG,
249 unsigned HiFlag, unsigned LoFlag) const;
251 /// This function fills Ops, which is the list of operands that will later
252 /// be used when a function call node is created. It also generates
253 /// copyToReg nodes to set up argument registers.
255 getOpndList(SmallVectorImpl<SDValue> &Ops,
256 std::deque< std::pair<unsigned, SDValue> > &RegsToPass,
257 bool IsPICCall, bool GlobalOrExternal, bool InternalLinkage,
258 CallLoweringInfo &CLI, SDValue Callee, SDValue Chain) const;
260 /// ByValArgInfo - Byval argument information.
261 struct ByValArgInfo {
262 unsigned FirstIdx; // Index of the first register used.
263 unsigned NumRegs; // Number of registers used for this argument.
264 unsigned Address; // Offset of the stack area used to pass this argument.
266 ByValArgInfo() : FirstIdx(0), NumRegs(0), Address(0) {}
269 /// MipsCC - This class provides methods used to analyze formal and call
270 /// arguments and inquire about calling convention information.
273 enum SpecialCallingConvType {
274 Mips16RetHelperConv, NoSpecialCallingConv
277 MipsCC(CallingConv::ID CallConv, bool IsO32, bool IsFP64, CCState &Info,
278 SpecialCallingConvType SpecialCallingConv = NoSpecialCallingConv);
281 void analyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
282 bool IsVarArg, bool IsSoftFloat,
283 const SDNode *CallNode,
284 std::vector<ArgListEntry> &FuncArgs);
285 void analyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
287 Function::const_arg_iterator FuncArg);
289 void analyzeCallResult(const SmallVectorImpl<ISD::InputArg> &Ins,
290 bool IsSoftFloat, const SDNode *CallNode,
291 const Type *RetTy) const;
293 void analyzeReturn(const SmallVectorImpl<ISD::OutputArg> &Outs,
294 bool IsSoftFloat, const Type *RetTy) const;
296 const CCState &getCCInfo() const { return CCInfo; }
298 /// hasByValArg - Returns true if function has byval arguments.
299 bool hasByValArg() const { return !ByValArgs.empty(); }
301 /// regSize - Size (in number of bits) of integer registers.
302 unsigned regSize() const { return IsO32 ? 4 : 8; }
304 /// numIntArgRegs - Number of integer registers available for calls.
305 unsigned numIntArgRegs() const;
307 /// reservedArgArea - The size of the area the caller reserves for
308 /// register arguments. This is 16-byte if ABI is O32.
309 unsigned reservedArgArea() const;
311 /// Return pointer to array of integer argument registers.
312 const uint16_t *intArgRegs() const;
314 typedef SmallVectorImpl<ByValArgInfo>::const_iterator byval_iterator;
315 byval_iterator byval_begin() const { return ByValArgs.begin(); }
316 byval_iterator byval_end() const { return ByValArgs.end(); }
319 void handleByValArg(unsigned ValNo, MVT ValVT, MVT LocVT,
320 CCValAssign::LocInfo LocInfo,
321 ISD::ArgFlagsTy ArgFlags);
323 /// useRegsForByval - Returns true if the calling convention allows the
324 /// use of registers to pass byval arguments.
325 bool useRegsForByval() const { return CallConv != CallingConv::Fast; }
327 /// Return the function that analyzes fixed argument list functions.
328 llvm::CCAssignFn *fixedArgFn() const;
330 /// Return the function that analyzes variable argument list functions.
331 llvm::CCAssignFn *varArgFn() const;
333 const uint16_t *shadowRegs() const;
335 void allocateRegs(ByValArgInfo &ByVal, unsigned ByValSize,
338 /// Return the type of the register which is used to pass an argument or
339 /// return a value. This function returns f64 if the argument is an i64
340 /// value which has been generated as a result of softening an f128 value.
341 /// Otherwise, it just returns VT.
342 MVT getRegVT(MVT VT, const Type *OrigTy, const SDNode *CallNode,
343 bool IsSoftFloat) const;
345 template<typename Ty>
346 void analyzeReturn(const SmallVectorImpl<Ty> &RetVals, bool IsSoftFloat,
347 const SDNode *CallNode, const Type *RetTy) const;
350 CallingConv::ID CallConv;
352 SpecialCallingConvType SpecialCallingConv;
353 SmallVector<ByValArgInfo, 2> ByValArgs;
356 SDValue lowerLOAD(SDValue Op, SelectionDAG &DAG) const;
357 SDValue lowerSTORE(SDValue Op, SelectionDAG &DAG) const;
360 const MipsSubtarget *Subtarget;
362 bool HasMips64, IsN64, IsO32;
366 MipsCC::SpecialCallingConvType getSpecialCallingConv(SDValue Callee) const;
367 // Lower Operand helpers
368 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
369 CallingConv::ID CallConv, bool isVarArg,
370 const SmallVectorImpl<ISD::InputArg> &Ins,
371 SDLoc dl, SelectionDAG &DAG,
372 SmallVectorImpl<SDValue> &InVals,
373 const SDNode *CallNode, const Type *RetTy) const;
375 // Lower Operand specifics
376 SDValue lowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
377 SDValue lowerBRCOND(SDValue Op, SelectionDAG &DAG) const;
378 SDValue lowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
379 SDValue lowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
380 SDValue lowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
381 SDValue lowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
382 SDValue lowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
383 SDValue lowerSELECT(SDValue Op, SelectionDAG &DAG) const;
384 SDValue lowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
385 SDValue lowerSETCC(SDValue Op, SelectionDAG &DAG) const;
386 SDValue lowerVASTART(SDValue Op, SelectionDAG &DAG) const;
387 SDValue lowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const;
388 SDValue lowerFABS(SDValue Op, SelectionDAG &DAG) const;
389 SDValue lowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
390 SDValue lowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
391 SDValue lowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const;
392 SDValue lowerATOMIC_FENCE(SDValue Op, SelectionDAG& DAG) const;
393 SDValue lowerShiftLeftParts(SDValue Op, SelectionDAG& DAG) const;
394 SDValue lowerShiftRightParts(SDValue Op, SelectionDAG& DAG,
396 SDValue lowerADD(SDValue Op, SelectionDAG &DAG) const;
397 SDValue lowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) const;
399 /// isEligibleForTailCallOptimization - Check whether the call is eligible
400 /// for tail call optimization.
402 isEligibleForTailCallOptimization(const MipsCC &MipsCCInfo,
403 unsigned NextStackOffset,
404 const MipsFunctionInfo& FI) const = 0;
406 /// copyByValArg - Copy argument registers which were used to pass a byval
407 /// argument to the stack. Create a stack frame object for the byval
409 void copyByValRegs(SDValue Chain, SDLoc DL,
410 std::vector<SDValue> &OutChains, SelectionDAG &DAG,
411 const ISD::ArgFlagsTy &Flags,
412 SmallVectorImpl<SDValue> &InVals,
413 const Argument *FuncArg,
414 const MipsCC &CC, const ByValArgInfo &ByVal) const;
416 /// passByValArg - Pass a byval argument in registers or on stack.
417 void passByValArg(SDValue Chain, SDLoc DL,
418 std::deque< std::pair<unsigned, SDValue> > &RegsToPass,
419 SmallVectorImpl<SDValue> &MemOpChains, SDValue StackPtr,
420 MachineFrameInfo *MFI, SelectionDAG &DAG, SDValue Arg,
421 const MipsCC &CC, const ByValArgInfo &ByVal,
422 const ISD::ArgFlagsTy &Flags, bool isLittle) const;
424 /// writeVarArgRegs - Write variable function arguments passed in registers
425 /// to the stack. Also create a stack frame object for the first variable
427 void writeVarArgRegs(std::vector<SDValue> &OutChains, const MipsCC &CC,
428 SDValue Chain, SDLoc DL, SelectionDAG &DAG) const;
431 LowerFormalArguments(SDValue Chain,
432 CallingConv::ID CallConv, bool isVarArg,
433 const SmallVectorImpl<ISD::InputArg> &Ins,
434 SDLoc dl, SelectionDAG &DAG,
435 SmallVectorImpl<SDValue> &InVals) const;
437 SDValue passArgOnStack(SDValue StackPtr, unsigned Offset, SDValue Chain,
438 SDValue Arg, SDLoc DL, bool IsTailCall,
439 SelectionDAG &DAG) const;
442 LowerCall(TargetLowering::CallLoweringInfo &CLI,
443 SmallVectorImpl<SDValue> &InVals) const;
446 CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
448 const SmallVectorImpl<ISD::OutputArg> &Outs,
449 LLVMContext &Context) const;
452 LowerReturn(SDValue Chain,
453 CallingConv::ID CallConv, bool isVarArg,
454 const SmallVectorImpl<ISD::OutputArg> &Outs,
455 const SmallVectorImpl<SDValue> &OutVals,
456 SDLoc dl, SelectionDAG &DAG) const;
458 // Inline asm support
459 ConstraintType getConstraintType(const std::string &Constraint) const;
461 /// Examine constraint string and operand type and determine a weight value.
462 /// The operand object must already have been set up with the operand type.
463 ConstraintWeight getSingleConstraintMatchWeight(
464 AsmOperandInfo &info, const char *constraint) const;
466 /// This function parses registers that appear in inline-asm constraints.
467 /// It returns pair (0, 0) on failure.
468 std::pair<unsigned, const TargetRegisterClass *>
469 parseRegForInlineAsmConstraint(const StringRef &C, MVT VT) const;
471 std::pair<unsigned, const TargetRegisterClass*>
472 getRegForInlineAsmConstraint(const std::string &Constraint,
475 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
476 /// vector. If it is invalid, don't add anything to Ops. If hasMemory is
477 /// true it means one of the asm constraint of the inline asm instruction
478 /// being processed is 'm'.
479 virtual void LowerAsmOperandForConstraint(SDValue Op,
480 std::string &Constraint,
481 std::vector<SDValue> &Ops,
482 SelectionDAG &DAG) const;
484 virtual bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const;
486 virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
488 virtual EVT getOptimalMemOpType(uint64_t Size, unsigned DstAlign,
490 bool IsMemset, bool ZeroMemset,
492 MachineFunction &MF) const;
494 /// isFPImmLegal - Returns true if the target can instruction select the
495 /// specified FP immediate natively. If false, the legalizer will
496 /// materialize the FP immediate as a load from a constant pool.
497 virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const;
499 virtual unsigned getJumpTableEncoding() const;
501 MachineBasicBlock *emitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
502 unsigned Size, unsigned BinOpcode, bool Nand = false) const;
503 MachineBasicBlock *emitAtomicBinaryPartword(MachineInstr *MI,
504 MachineBasicBlock *BB, unsigned Size, unsigned BinOpcode,
505 bool Nand = false) const;
506 MachineBasicBlock *emitAtomicCmpSwap(MachineInstr *MI,
507 MachineBasicBlock *BB, unsigned Size) const;
508 MachineBasicBlock *emitAtomicCmpSwapPartword(MachineInstr *MI,
509 MachineBasicBlock *BB, unsigned Size) const;
512 /// Create MipsTargetLowering objects.
513 const MipsTargetLowering *createMips16TargetLowering(MipsTargetMachine &TM);
514 const MipsTargetLowering *createMipsSETargetLowering(MipsTargetMachine &TM);
517 #endif // MipsISELLOWERING_H