MipsISelLowering.h revision cb2eafdfa358ae8a1e1f9ae39d8c72cd4d446da1
1//===-- MipsISelLowering.h - Mips DAG Lowering Interface --------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the interfaces that Mips uses to lower LLVM code into a 11// selection DAG. 12// 13//===----------------------------------------------------------------------===// 14 15#ifndef MipsISELLOWERING_H 16#define MipsISELLOWERING_H 17 18#include "Mips.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" 24#include <deque> 25#include <string> 26 27namespace llvm { 28 namespace MipsISD { 29 enum NodeType { 30 // Start the numbering from where ISD NodeType finishes. 31 FIRST_NUMBER = ISD::BUILTIN_OP_END, 32 33 // Jump and link (call) 34 JmpLink, 35 36 // Tail call 37 TailCall, 38 39 // Get the Higher 16 bits from a 32-bit immediate 40 // No relation with Mips Hi register 41 Hi, 42 43 // Get the Lower 16 bits from a 32-bit immediate 44 // No relation with Mips Lo register 45 Lo, 46 47 // Handle gp_rel (small data/bss sections) relocation. 48 GPRel, 49 50 // Thread Pointer 51 ThreadPointer, 52 53 // Floating Point Branch Conditional 54 FPBrcond, 55 56 // Floating Point Compare 57 FPCmp, 58 59 // Floating Point Conditional Moves 60 CMovFP_T, 61 CMovFP_F, 62 63 // Floating Point Rounding 64 FPRound, 65 66 // Return 67 Ret, 68 69 EH_RETURN, 70 71 // MAdd/Sub nodes 72 MAdd, 73 MAddu, 74 MSub, 75 MSubu, 76 77 // DivRem(u) 78 DivRem, 79 DivRemU, 80 81 BuildPairF64, 82 ExtractElementF64, 83 84 Wrapper, 85 86 DynAlloc, 87 88 Sync, 89 90 Ext, 91 Ins, 92 93 // EXTR.W instrinsic nodes. 94 EXTP, 95 EXTPDP, 96 EXTR_S_H, 97 EXTR_W, 98 EXTR_R_W, 99 EXTR_RS_W, 100 SHILO, 101 MTHLIP, 102 103 // DPA.W intrinsic nodes. 104 MULSAQ_S_W_PH, 105 MAQ_S_W_PHL, 106 MAQ_S_W_PHR, 107 MAQ_SA_W_PHL, 108 MAQ_SA_W_PHR, 109 DPAU_H_QBL, 110 DPAU_H_QBR, 111 DPSU_H_QBL, 112 DPSU_H_QBR, 113 DPAQ_S_W_PH, 114 DPSQ_S_W_PH, 115 DPAQ_SA_L_W, 116 DPSQ_SA_L_W, 117 DPA_W_PH, 118 DPS_W_PH, 119 DPAQX_S_W_PH, 120 DPAQX_SA_W_PH, 121 DPAX_W_PH, 122 DPSX_W_PH, 123 DPSQX_S_W_PH, 124 DPSQX_SA_W_PH, 125 MULSA_W_PH, 126 127 MULT, 128 MULTU, 129 MADD_DSP, 130 MADDU_DSP, 131 MSUB_DSP, 132 MSUBU_DSP, 133 134 // Load/Store Left/Right nodes. 135 LWL = ISD::FIRST_TARGET_MEMORY_OPCODE, 136 LWR, 137 SWL, 138 SWR, 139 LDL, 140 LDR, 141 SDL, 142 SDR 143 }; 144 } 145 146 //===--------------------------------------------------------------------===// 147 // TargetLowering Implementation 148 //===--------------------------------------------------------------------===// 149 class MipsFunctionInfo; 150 151 class MipsTargetLowering : public TargetLowering { 152 public: 153 explicit MipsTargetLowering(MipsTargetMachine &TM); 154 155 virtual MVT getScalarShiftAmountTy(EVT LHSTy) const { return MVT::i32; } 156 157 virtual bool allowsUnalignedMemoryAccesses (EVT VT, bool *Fast) const; 158 159 virtual void LowerOperationWrapper(SDNode *N, 160 SmallVectorImpl<SDValue> &Results, 161 SelectionDAG &DAG) const; 162 163 /// LowerOperation - Provide custom lowering hooks for some operations. 164 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const; 165 166 /// ReplaceNodeResults - Replace the results of node with an illegal result 167 /// type with new values built out of custom code. 168 /// 169 virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results, 170 SelectionDAG &DAG) const; 171 172 /// getTargetNodeName - This method returns the name of a target specific 173 // DAG node. 174 virtual const char *getTargetNodeName(unsigned Opcode) const; 175 176 /// getSetCCResultType - get the ISD::SETCC result ValueType 177 EVT getSetCCResultType(EVT VT) const; 178 179 virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const; 180 private: 181 182 void SetMips16LibcallName(RTLIB::Libcall, const char *Name); 183 184 void setMips16HardFloatLibCalls(); 185 186 unsigned int 187 getMips16HelperFunctionStubNumber(ArgListTy &Args) const; 188 189 const char *getMips16HelperFunction 190 (Type* RetTy, ArgListTy &Args, bool &needHelper) const; 191 192 /// ByValArgInfo - Byval argument information. 193 struct ByValArgInfo { 194 unsigned FirstIdx; // Index of the first register used. 195 unsigned NumRegs; // Number of registers used for this argument. 196 unsigned Address; // Offset of the stack area used to pass this argument. 197 198 ByValArgInfo() : FirstIdx(0), NumRegs(0), Address(0) {} 199 }; 200 201 /// MipsCC - This class provides methods used to analyze formal and call 202 /// arguments and inquire about calling convention information. 203 class MipsCC { 204 public: 205 MipsCC(CallingConv::ID CallConv, bool IsO32, CCState &Info); 206 207 void analyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs, 208 bool IsVarArg, bool IsSoftFloat, 209 const SDNode *CallNode, 210 std::vector<ArgListEntry> &FuncArgs); 211 void analyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins, 212 bool IsSoftFloat, 213 Function::const_arg_iterator FuncArg); 214 const CCState &getCCInfo() const { return CCInfo; } 215 216 /// hasByValArg - Returns true if function has byval arguments. 217 bool hasByValArg() const { return !ByValArgs.empty(); } 218 219 /// regSize - Size (in number of bits) of integer registers. 220 unsigned regSize() const { return IsO32 ? 4 : 8; } 221 222 /// numIntArgRegs - Number of integer registers available for calls. 223 unsigned numIntArgRegs() const; 224 225 /// reservedArgArea - The size of the area the caller reserves for 226 /// register arguments. This is 16-byte if ABI is O32. 227 unsigned reservedArgArea() const; 228 229 /// Return pointer to array of integer argument registers. 230 const uint16_t *intArgRegs() const; 231 232 typedef SmallVector<ByValArgInfo, 2>::const_iterator byval_iterator; 233 byval_iterator byval_begin() const { return ByValArgs.begin(); } 234 byval_iterator byval_end() const { return ByValArgs.end(); } 235 236 private: 237 void handleByValArg(unsigned ValNo, MVT ValVT, MVT LocVT, 238 CCValAssign::LocInfo LocInfo, 239 ISD::ArgFlagsTy ArgFlags); 240 241 /// useRegsForByval - Returns true if the calling convention allows the 242 /// use of registers to pass byval arguments. 243 bool useRegsForByval() const { return CallConv != CallingConv::Fast; } 244 245 /// Return the function that analyzes fixed argument list functions. 246 llvm::CCAssignFn *fixedArgFn() const; 247 248 /// Return the function that analyzes variable argument list functions. 249 llvm::CCAssignFn *varArgFn() const; 250 251 const uint16_t *shadowRegs() const; 252 253 void allocateRegs(ByValArgInfo &ByVal, unsigned ByValSize, 254 unsigned Align); 255 256 /// Return the type of the register which is used to pass an argument or 257 /// return a value. This function returns f64 if the argument is an i64 258 /// value which has been generated as a result of softening an f128 value. 259 /// Otherwise, it just returns VT. 260 MVT getRegVT(MVT VT, const Type *OrigTy, const SDNode *CallNode, 261 bool IsSoftFloat) const; 262 263 CCState &CCInfo; 264 CallingConv::ID CallConv; 265 bool IsO32; 266 SmallVector<ByValArgInfo, 2> ByValArgs; 267 }; 268 269 // Subtarget Info 270 const MipsSubtarget *Subtarget; 271 272 bool HasMips64, IsN64, IsO32; 273 274 // Lower Operand helpers 275 SDValue LowerCallResult(SDValue Chain, SDValue InFlag, 276 CallingConv::ID CallConv, bool isVarArg, 277 const SmallVectorImpl<ISD::InputArg> &Ins, 278 DebugLoc dl, SelectionDAG &DAG, 279 SmallVectorImpl<SDValue> &InVals) const; 280 281 // Lower Operand specifics 282 SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) const; 283 SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const; 284 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const; 285 SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const; 286 SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const; 287 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const; 288 SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const; 289 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const; 290 SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const; 291 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const; 292 SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const; 293 SDValue LowerFABS(SDValue Op, SelectionDAG &DAG) const; 294 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const; 295 SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const; 296 SDValue LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const; 297 SDValue LowerMEMBARRIER(SDValue Op, SelectionDAG& DAG) const; 298 SDValue LowerATOMIC_FENCE(SDValue Op, SelectionDAG& DAG) const; 299 SDValue LowerShiftLeftParts(SDValue Op, SelectionDAG& DAG) const; 300 SDValue LowerShiftRightParts(SDValue Op, SelectionDAG& DAG, 301 bool IsSRA) const; 302 SDValue LowerLOAD(SDValue Op, SelectionDAG &DAG) const; 303 SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG) const; 304 SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const; 305 SDValue LowerINTRINSIC_W_CHAIN(SDValue Op, SelectionDAG &DAG) const; 306 SDValue LowerADD(SDValue Op, SelectionDAG &DAG) const; 307 308 /// IsEligibleForTailCallOptimization - Check whether the call is eligible 309 /// for tail call optimization. 310 bool IsEligibleForTailCallOptimization(const MipsCC &MipsCCInfo, 311 unsigned NextStackOffset, 312 const MipsFunctionInfo& FI) const; 313 314 /// copyByValArg - Copy argument registers which were used to pass a byval 315 /// argument to the stack. Create a stack frame object for the byval 316 /// argument. 317 void copyByValRegs(SDValue Chain, DebugLoc DL, 318 std::vector<SDValue> &OutChains, SelectionDAG &DAG, 319 const ISD::ArgFlagsTy &Flags, 320 SmallVectorImpl<SDValue> &InVals, 321 const Argument *FuncArg, 322 const MipsCC &CC, const ByValArgInfo &ByVal) const; 323 324 /// passByValArg - Pass a byval argument in registers or on stack. 325 void passByValArg(SDValue Chain, DebugLoc DL, 326 std::deque< std::pair<unsigned, SDValue> > &RegsToPass, 327 SmallVector<SDValue, 8> &MemOpChains, SDValue StackPtr, 328 MachineFrameInfo *MFI, SelectionDAG &DAG, SDValue Arg, 329 const MipsCC &CC, const ByValArgInfo &ByVal, 330 const ISD::ArgFlagsTy &Flags, bool isLittle) const; 331 332 /// writeVarArgRegs - Write variable function arguments passed in registers 333 /// to the stack. Also create a stack frame object for the first variable 334 /// argument. 335 void writeVarArgRegs(std::vector<SDValue> &OutChains, const MipsCC &CC, 336 SDValue Chain, DebugLoc DL, SelectionDAG &DAG) const; 337 338 virtual SDValue 339 LowerFormalArguments(SDValue Chain, 340 CallingConv::ID CallConv, bool isVarArg, 341 const SmallVectorImpl<ISD::InputArg> &Ins, 342 DebugLoc dl, SelectionDAG &DAG, 343 SmallVectorImpl<SDValue> &InVals) const; 344 345 SDValue passArgOnStack(SDValue StackPtr, unsigned Offset, SDValue Chain, 346 SDValue Arg, DebugLoc DL, bool IsTailCall, 347 SelectionDAG &DAG) const; 348 349 virtual SDValue 350 LowerCall(TargetLowering::CallLoweringInfo &CLI, 351 SmallVectorImpl<SDValue> &InVals) const; 352 353 virtual bool 354 CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF, 355 bool isVarArg, 356 const SmallVectorImpl<ISD::OutputArg> &Outs, 357 LLVMContext &Context) const; 358 359 virtual SDValue 360 LowerReturn(SDValue Chain, 361 CallingConv::ID CallConv, bool isVarArg, 362 const SmallVectorImpl<ISD::OutputArg> &Outs, 363 const SmallVectorImpl<SDValue> &OutVals, 364 DebugLoc dl, SelectionDAG &DAG) const; 365 366 virtual MachineBasicBlock * 367 EmitInstrWithCustomInserter(MachineInstr *MI, 368 MachineBasicBlock *MBB) const; 369 370 // Inline asm support 371 ConstraintType getConstraintType(const std::string &Constraint) const; 372 373 /// Examine constraint string and operand type and determine a weight value. 374 /// The operand object must already have been set up with the operand type. 375 ConstraintWeight getSingleConstraintMatchWeight( 376 AsmOperandInfo &info, const char *constraint) const; 377 378 std::pair<unsigned, const TargetRegisterClass*> 379 getRegForInlineAsmConstraint(const std::string &Constraint, 380 EVT VT) const; 381 382 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops 383 /// vector. If it is invalid, don't add anything to Ops. If hasMemory is 384 /// true it means one of the asm constraint of the inline asm instruction 385 /// being processed is 'm'. 386 virtual void LowerAsmOperandForConstraint(SDValue Op, 387 std::string &Constraint, 388 std::vector<SDValue> &Ops, 389 SelectionDAG &DAG) const; 390 391 virtual bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const; 392 393 virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const; 394 395 virtual EVT getOptimalMemOpType(uint64_t Size, unsigned DstAlign, 396 unsigned SrcAlign, 397 bool IsMemset, bool ZeroMemset, 398 bool MemcpyStrSrc, 399 MachineFunction &MF) const; 400 401 /// isFPImmLegal - Returns true if the target can instruction select the 402 /// specified FP immediate natively. If false, the legalizer will 403 /// materialize the FP immediate as a load from a constant pool. 404 virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const; 405 406 virtual unsigned getJumpTableEncoding() const; 407 408 MachineBasicBlock *EmitBPOSGE32(MachineInstr *MI, 409 MachineBasicBlock *BB) const; 410 MachineBasicBlock *EmitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB, 411 unsigned Size, unsigned BinOpcode, bool Nand = false) const; 412 MachineBasicBlock *EmitAtomicBinaryPartword(MachineInstr *MI, 413 MachineBasicBlock *BB, unsigned Size, unsigned BinOpcode, 414 bool Nand = false) const; 415 MachineBasicBlock *EmitAtomicCmpSwap(MachineInstr *MI, 416 MachineBasicBlock *BB, unsigned Size) const; 417 MachineBasicBlock *EmitAtomicCmpSwapPartword(MachineInstr *MI, 418 MachineBasicBlock *BB, unsigned Size) const; 419 MachineBasicBlock *EmitSel16(unsigned Opc, MachineInstr *MI, 420 MachineBasicBlock *BB) const; 421 MachineBasicBlock *EmitSeliT16(unsigned Opc1, unsigned Opc2, 422 MachineInstr *MI, 423 MachineBasicBlock *BB) const; 424 425 MachineBasicBlock *EmitSelT16(unsigned Opc1, unsigned Opc2, 426 MachineInstr *MI, 427 MachineBasicBlock *BB) const; 428 MachineBasicBlock *EmitFEXT_T8I816_ins(unsigned BtOpc, unsigned CmpOpc, 429 MachineInstr *MI, 430 MachineBasicBlock *BB) const; 431 MachineBasicBlock *EmitFEXT_T8I8I16_ins( 432 unsigned BtOpc, unsigned CmpiOpc, unsigned CmpiXOpc, 433 MachineInstr *MI, MachineBasicBlock *BB) const; 434 MachineBasicBlock *EmitFEXT_CCRX16_ins( 435 unsigned SltOpc, 436 MachineInstr *MI, MachineBasicBlock *BB) const; 437 MachineBasicBlock *EmitFEXT_CCRXI16_ins( 438 unsigned SltiOpc, unsigned SltiXOpc, 439 MachineInstr *MI, MachineBasicBlock *BB )const; 440 441 }; 442} 443 444#endif // MipsISELLOWERING_H 445