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 // Floating Point Rounding
93 // EXTR.W instrinsic nodes.
103 // DPA.W intrinsic nodes.
134 // Load/Store Left/Right nodes.
135 LWL = ISD::FIRST_TARGET_MEMORY_OPCODE,
146 //===--------------------------------------------------------------------===//
147 // TargetLowering Implementation
148 //===--------------------------------------------------------------------===//
149 class MipsFunctionInfo;
151 class MipsTargetLowering : public TargetLowering {
153 explicit MipsTargetLowering(MipsTargetMachine &TM);
155 virtual MVT getScalarShiftAmountTy(EVT LHSTy) const { return MVT::i32; }
157 virtual bool allowsUnalignedMemoryAccesses (EVT VT, bool *Fast) const;
159 virtual void LowerOperationWrapper(SDNode *N,
160 SmallVectorImpl<SDValue> &Results,
161 SelectionDAG &DAG) const;
163 /// LowerOperation - Provide custom lowering hooks for some operations.
164 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
166 /// ReplaceNodeResults - Replace the results of node with an illegal result
167 /// type with new values built out of custom code.
169 virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
170 SelectionDAG &DAG) const;
172 /// getTargetNodeName - This method returns the name of a target specific
174 virtual const char *getTargetNodeName(unsigned Opcode) const;
176 /// getSetCCResultType - get the ISD::SETCC result ValueType
177 EVT getSetCCResultType(EVT VT) const;
179 virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
182 void SetMips16LibcallName(RTLIB::Libcall, const char *Name);
184 void setMips16HardFloatLibCalls();
187 getMips16HelperFunctionStubNumber(ArgListTy &Args) const;
189 const char *getMips16HelperFunction
190 (Type* RetTy, ArgListTy &Args, bool &needHelper) const;
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.
198 ByValArgInfo() : FirstIdx(0), NumRegs(0), Address(0) {}
201 /// MipsCC - This class provides methods used to analyze formal and call
202 /// arguments and inquire about calling convention information.
205 MipsCC(CallingConv::ID CallConv, bool IsO32, CCState &Info);
207 void analyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
209 void analyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
211 Function::const_arg_iterator FuncArg);
212 const CCState &getCCInfo() const { return CCInfo; }
214 /// hasByValArg - Returns true if function has byval arguments.
215 bool hasByValArg() const { return !ByValArgs.empty(); }
217 /// regSize - Size (in number of bits) of integer registers.
218 unsigned regSize() const { return IsO32 ? 4 : 8; }
220 /// numIntArgRegs - Number of integer registers available for calls.
221 unsigned numIntArgRegs() const;
223 /// reservedArgArea - The size of the area the caller reserves for
224 /// register arguments. This is 16-byte if ABI is O32.
225 unsigned reservedArgArea() const;
227 /// Return pointer to array of integer argument registers.
228 const uint16_t *intArgRegs() const;
230 typedef SmallVector<ByValArgInfo, 2>::const_iterator byval_iterator;
231 byval_iterator byval_begin() const { return ByValArgs.begin(); }
232 byval_iterator byval_end() const { return ByValArgs.end(); }
235 void handleByValArg(unsigned ValNo, MVT ValVT, MVT LocVT,
236 CCValAssign::LocInfo LocInfo,
237 ISD::ArgFlagsTy ArgFlags);
239 /// useRegsForByval - Returns true if the calling convention allows the
240 /// use of registers to pass byval arguments.
241 bool useRegsForByval() const { return CallConv != CallingConv::Fast; }
243 /// Return the function that analyzes fixed argument list functions.
244 llvm::CCAssignFn *fixedArgFn() const;
246 /// Return the function that analyzes variable argument list functions.
247 llvm::CCAssignFn *varArgFn() const;
249 const uint16_t *shadowRegs() const;
251 void allocateRegs(ByValArgInfo &ByVal, unsigned ByValSize,
254 /// Return the type of the register which is used to pass an argument or
255 /// return a value. This function returns f64 if the argument is an i64
256 /// value which has been generated as a result of softening an f128 value.
257 /// Otherwise, it just returns VT.
258 MVT getRegVT(MVT VT, const Type *OrigTy, const SDNode *CallNode,
259 bool IsSoftFloat) const;
262 CallingConv::ID CallConv;
264 SmallVector<ByValArgInfo, 2> ByValArgs;
268 const MipsSubtarget *Subtarget;
270 bool HasMips64, IsN64, IsO32;
272 // Lower Operand helpers
273 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
274 CallingConv::ID CallConv, bool isVarArg,
275 const SmallVectorImpl<ISD::InputArg> &Ins,
276 DebugLoc dl, SelectionDAG &DAG,
277 SmallVectorImpl<SDValue> &InVals) const;
279 // Lower Operand specifics
280 SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) const;
281 SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
282 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
283 SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
284 SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
285 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
286 SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
287 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
288 SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
289 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
290 SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const;
291 SDValue LowerFABS(SDValue Op, SelectionDAG &DAG) const;
292 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
293 SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
294 SDValue LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const;
295 SDValue LowerMEMBARRIER(SDValue Op, SelectionDAG& DAG) const;
296 SDValue LowerATOMIC_FENCE(SDValue Op, SelectionDAG& DAG) const;
297 SDValue LowerShiftLeftParts(SDValue Op, SelectionDAG& DAG) const;
298 SDValue LowerShiftRightParts(SDValue Op, SelectionDAG& DAG,
300 SDValue LowerLOAD(SDValue Op, SelectionDAG &DAG) const;
301 SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG) const;
302 SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
303 SDValue LowerINTRINSIC_W_CHAIN(SDValue Op, SelectionDAG &DAG) const;
304 SDValue LowerADD(SDValue Op, SelectionDAG &DAG) const;
306 /// IsEligibleForTailCallOptimization - Check whether the call is eligible
307 /// for tail call optimization.
308 bool IsEligibleForTailCallOptimization(const MipsCC &MipsCCInfo,
309 unsigned NextStackOffset,
310 const MipsFunctionInfo& FI) const;
312 /// copyByValArg - Copy argument registers which were used to pass a byval
313 /// argument to the stack. Create a stack frame object for the byval
315 void copyByValRegs(SDValue Chain, DebugLoc DL,
316 std::vector<SDValue> &OutChains, SelectionDAG &DAG,
317 const ISD::ArgFlagsTy &Flags,
318 SmallVectorImpl<SDValue> &InVals,
319 const Argument *FuncArg,
320 const MipsCC &CC, const ByValArgInfo &ByVal) const;
322 /// passByValArg - Pass a byval argument in registers or on stack.
323 void passByValArg(SDValue Chain, DebugLoc DL,
324 std::deque< std::pair<unsigned, SDValue> > &RegsToPass,
325 SmallVector<SDValue, 8> &MemOpChains, SDValue StackPtr,
326 MachineFrameInfo *MFI, SelectionDAG &DAG, SDValue Arg,
327 const MipsCC &CC, const ByValArgInfo &ByVal,
328 const ISD::ArgFlagsTy &Flags, bool isLittle) const;
330 /// writeVarArgRegs - Write variable function arguments passed in registers
331 /// to the stack. Also create a stack frame object for the first variable
333 void writeVarArgRegs(std::vector<SDValue> &OutChains, const MipsCC &CC,
334 SDValue Chain, DebugLoc DL, SelectionDAG &DAG) const;
337 LowerFormalArguments(SDValue Chain,
338 CallingConv::ID CallConv, bool isVarArg,
339 const SmallVectorImpl<ISD::InputArg> &Ins,
340 DebugLoc dl, SelectionDAG &DAG,
341 SmallVectorImpl<SDValue> &InVals) const;
343 SDValue passArgOnStack(SDValue StackPtr, unsigned Offset, SDValue Chain,
344 SDValue Arg, DebugLoc DL, bool IsTailCall,
345 SelectionDAG &DAG) const;
348 LowerCall(TargetLowering::CallLoweringInfo &CLI,
349 SmallVectorImpl<SDValue> &InVals) const;
352 CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
354 const SmallVectorImpl<ISD::OutputArg> &Outs,
355 LLVMContext &Context) const;
358 LowerReturn(SDValue Chain,
359 CallingConv::ID CallConv, bool isVarArg,
360 const SmallVectorImpl<ISD::OutputArg> &Outs,
361 const SmallVectorImpl<SDValue> &OutVals,
362 DebugLoc dl, SelectionDAG &DAG) const;
364 virtual MachineBasicBlock *
365 EmitInstrWithCustomInserter(MachineInstr *MI,
366 MachineBasicBlock *MBB) const;
368 // Inline asm support
369 ConstraintType getConstraintType(const std::string &Constraint) const;
371 /// Examine constraint string and operand type and determine a weight value.
372 /// The operand object must already have been set up with the operand type.
373 ConstraintWeight getSingleConstraintMatchWeight(
374 AsmOperandInfo &info, const char *constraint) const;
376 std::pair<unsigned, const TargetRegisterClass*>
377 getRegForInlineAsmConstraint(const std::string &Constraint,
380 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
381 /// vector. If it is invalid, don't add anything to Ops. If hasMemory is
382 /// true it means one of the asm constraint of the inline asm instruction
383 /// being processed is 'm'.
384 virtual void LowerAsmOperandForConstraint(SDValue Op,
385 std::string &Constraint,
386 std::vector<SDValue> &Ops,
387 SelectionDAG &DAG) const;
389 virtual bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const;
391 virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
393 virtual EVT getOptimalMemOpType(uint64_t Size, unsigned DstAlign,
395 bool IsMemset, bool ZeroMemset,
397 MachineFunction &MF) const;
399 /// isFPImmLegal - Returns true if the target can instruction select the
400 /// specified FP immediate natively. If false, the legalizer will
401 /// materialize the FP immediate as a load from a constant pool.
402 virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const;
404 virtual unsigned getJumpTableEncoding() const;
406 MachineBasicBlock *EmitBPOSGE32(MachineInstr *MI,
407 MachineBasicBlock *BB) const;
408 MachineBasicBlock *EmitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
409 unsigned Size, unsigned BinOpcode, bool Nand = false) const;
410 MachineBasicBlock *EmitAtomicBinaryPartword(MachineInstr *MI,
411 MachineBasicBlock *BB, unsigned Size, unsigned BinOpcode,
412 bool Nand = false) const;
413 MachineBasicBlock *EmitAtomicCmpSwap(MachineInstr *MI,
414 MachineBasicBlock *BB, unsigned Size) const;
415 MachineBasicBlock *EmitAtomicCmpSwapPartword(MachineInstr *MI,
416 MachineBasicBlock *BB, unsigned Size) const;
417 MachineBasicBlock *EmitSel16(unsigned Opc, MachineInstr *MI,
418 MachineBasicBlock *BB) const;
419 MachineBasicBlock *EmitSeliT16(unsigned Opc1, unsigned Opc2,
421 MachineBasicBlock *BB) const;
423 MachineBasicBlock *EmitSelT16(unsigned Opc1, unsigned Opc2,
425 MachineBasicBlock *BB) const;
426 MachineBasicBlock *EmitFEXT_T8I816_ins(unsigned BtOpc, unsigned CmpOpc,
428 MachineBasicBlock *BB) const;
429 MachineBasicBlock *EmitFEXT_T8I8I16_ins(
430 unsigned BtOpc, unsigned CmpiOpc, unsigned CmpiXOpc,
431 MachineInstr *MI, MachineBasicBlock *BB) const;
432 MachineBasicBlock *EmitFEXT_CCRX16_ins(
434 MachineInstr *MI, MachineBasicBlock *BB) const;
435 MachineBasicBlock *EmitFEXT_CCRXI16_ins(
436 unsigned SltiOpc, unsigned SltiXOpc,
437 MachineInstr *MI, MachineBasicBlock *BB )const;
442 #endif // MipsISELLOWERING_H