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/Target/TargetLowering.h"
29 // Start the numbering from where ISD NodeType finishes.
30 FIRST_NUMBER = ISD::BUILTIN_OP_END,
32 // Jump and link (call)
38 // Get the Higher 16 bits from a 32-bit immediate
39 // No relation with Mips Hi register
42 // Get the Lower 16 bits from a 32-bit immediate
43 // No relation with Mips Lo register
46 // Handle gp_rel (small data/bss sections) relocation.
52 // Floating Point Branch Conditional
55 // Floating Point Compare
58 // Floating Point Conditional Moves
62 // Floating Point Rounding
92 // EXTR.W instrinsic nodes.
102 // DPA.W intrinsic nodes.
133 // Load/Store Left/Right nodes.
134 LWL = ISD::FIRST_TARGET_MEMORY_OPCODE,
145 //===--------------------------------------------------------------------===//
146 // TargetLowering Implementation
147 //===--------------------------------------------------------------------===//
148 class MipsFunctionInfo;
150 class MipsTargetLowering : public TargetLowering {
152 explicit MipsTargetLowering(MipsTargetMachine &TM);
154 virtual MVT getShiftAmountTy(EVT LHSTy) const { return MVT::i32; }
156 virtual bool allowsUnalignedMemoryAccesses (EVT VT, bool *Fast) const;
158 virtual void LowerOperationWrapper(SDNode *N,
159 SmallVectorImpl<SDValue> &Results,
160 SelectionDAG &DAG) const;
162 /// LowerOperation - Provide custom lowering hooks for some operations.
163 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
165 /// ReplaceNodeResults - Replace the results of node with an illegal result
166 /// type with new values built out of custom code.
168 virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
169 SelectionDAG &DAG) const;
171 /// getTargetNodeName - This method returns the name of a target specific
173 virtual const char *getTargetNodeName(unsigned Opcode) const;
175 /// getSetCCResultType - get the ISD::SETCC result ValueType
176 EVT getSetCCResultType(EVT VT) const;
178 virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
181 void SetMips16LibcallName(RTLIB::Libcall, const char *Name);
183 void setMips16HardFloatLibCalls();
186 getMips16HelperFunctionStubNumber(ArgListTy &Args) const;
188 const char *getMips16HelperFunction
189 (Type* RetTy, ArgListTy &Args, bool &needHelper) const;
191 /// ByValArgInfo - Byval argument information.
192 struct ByValArgInfo {
193 unsigned FirstIdx; // Index of the first register used.
194 unsigned NumRegs; // Number of registers used for this argument.
195 unsigned Address; // Offset of the stack area used to pass this argument.
197 ByValArgInfo() : FirstIdx(0), NumRegs(0), Address(0) {}
200 /// MipsCC - This class provides methods used to analyze formal and call
201 /// arguments and inquire about calling convention information.
204 MipsCC(CallingConv::ID CallConv, bool IsVarArg, bool IsO32,
207 void analyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs);
208 void analyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins);
209 void handleByValArg(unsigned ValNo, MVT ValVT, MVT LocVT,
210 CCValAssign::LocInfo LocInfo,
211 ISD::ArgFlagsTy ArgFlags);
213 const CCState &getCCInfo() const { return CCInfo; }
215 /// hasByValArg - Returns true if function has byval arguments.
216 bool hasByValArg() const { return !ByValArgs.empty(); }
218 /// useRegsForByval - Returns true if the calling convention allows the
219 /// use of registers to pass byval arguments.
220 bool useRegsForByval() const { return UseRegsForByval; }
222 /// regSize - Size (in number of bits) of integer registers.
223 unsigned regSize() const { return RegSize; }
225 /// numIntArgRegs - Number of integer registers available for calls.
226 unsigned numIntArgRegs() const { return NumIntArgRegs; }
228 /// reservedArgArea - The size of the area the caller reserves for
229 /// register arguments. This is 16-byte if ABI is O32.
230 unsigned reservedArgArea() const { return ReservedArgArea; }
232 /// intArgRegs - Pointer to array of integer registers.
233 const uint16_t *intArgRegs() const { return IntArgRegs; }
235 typedef SmallVector<ByValArgInfo, 2>::const_iterator byval_iterator;
236 byval_iterator byval_begin() const { return ByValArgs.begin(); }
237 byval_iterator byval_end() const { return ByValArgs.end(); }
240 void allocateRegs(ByValArgInfo &ByVal, unsigned ByValSize,
244 bool UseRegsForByval;
246 unsigned NumIntArgRegs;
247 unsigned ReservedArgArea;
248 const uint16_t *IntArgRegs, *ShadowRegs;
249 SmallVector<ByValArgInfo, 2> ByValArgs;
250 llvm::CCAssignFn *FixedFn, *VarFn;
254 const MipsSubtarget *Subtarget;
256 bool HasMips64, IsN64, IsO32;
258 // Lower Operand helpers
259 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
260 CallingConv::ID CallConv, bool isVarArg,
261 const SmallVectorImpl<ISD::InputArg> &Ins,
262 DebugLoc dl, SelectionDAG &DAG,
263 SmallVectorImpl<SDValue> &InVals) const;
265 // Lower Operand specifics
266 SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) const;
267 SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
268 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
269 SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
270 SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
271 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
272 SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
273 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
274 SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
275 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
276 SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const;
277 SDValue LowerFABS(SDValue Op, SelectionDAG &DAG) const;
278 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
279 SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
280 SDValue LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const;
281 SDValue LowerMEMBARRIER(SDValue Op, SelectionDAG& DAG) const;
282 SDValue LowerATOMIC_FENCE(SDValue Op, SelectionDAG& DAG) const;
283 SDValue LowerShiftLeftParts(SDValue Op, SelectionDAG& DAG) const;
284 SDValue LowerShiftRightParts(SDValue Op, SelectionDAG& DAG,
286 SDValue LowerLOAD(SDValue Op, SelectionDAG &DAG) const;
287 SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG) const;
288 SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
289 SDValue LowerINTRINSIC_W_CHAIN(SDValue Op, SelectionDAG &DAG) const;
290 SDValue LowerADD(SDValue Op, SelectionDAG &DAG) const;
292 /// IsEligibleForTailCallOptimization - Check whether the call is eligible
293 /// for tail call optimization.
294 bool IsEligibleForTailCallOptimization(const MipsCC &MipsCCInfo,
295 unsigned NextStackOffset,
296 const MipsFunctionInfo& FI) const;
298 /// copyByValArg - Copy argument registers which were used to pass a byval
299 /// argument to the stack. Create a stack frame object for the byval
301 void copyByValRegs(SDValue Chain, DebugLoc DL,
302 std::vector<SDValue> &OutChains, SelectionDAG &DAG,
303 const ISD::ArgFlagsTy &Flags,
304 SmallVectorImpl<SDValue> &InVals,
305 const Argument *FuncArg,
306 const MipsCC &CC, const ByValArgInfo &ByVal) const;
308 /// passByValArg - Pass a byval argument in registers or on stack.
309 void passByValArg(SDValue Chain, DebugLoc DL,
310 std::deque< std::pair<unsigned, SDValue> > &RegsToPass,
311 SmallVector<SDValue, 8> &MemOpChains, SDValue StackPtr,
312 MachineFrameInfo *MFI, SelectionDAG &DAG, SDValue Arg,
313 const MipsCC &CC, const ByValArgInfo &ByVal,
314 const ISD::ArgFlagsTy &Flags, bool isLittle) const;
316 /// writeVarArgRegs - Write variable function arguments passed in registers
317 /// to the stack. Also create a stack frame object for the first variable
319 void writeVarArgRegs(std::vector<SDValue> &OutChains, const MipsCC &CC,
320 SDValue Chain, DebugLoc DL, SelectionDAG &DAG) const;
323 LowerFormalArguments(SDValue Chain,
324 CallingConv::ID CallConv, bool isVarArg,
325 const SmallVectorImpl<ISD::InputArg> &Ins,
326 DebugLoc dl, SelectionDAG &DAG,
327 SmallVectorImpl<SDValue> &InVals) const;
329 SDValue passArgOnStack(SDValue StackPtr, unsigned Offset, SDValue Chain,
330 SDValue Arg, DebugLoc DL, bool IsTailCall,
331 SelectionDAG &DAG) const;
334 LowerCall(TargetLowering::CallLoweringInfo &CLI,
335 SmallVectorImpl<SDValue> &InVals) const;
338 CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
340 const SmallVectorImpl<ISD::OutputArg> &Outs,
341 LLVMContext &Context) const;
344 LowerReturn(SDValue Chain,
345 CallingConv::ID CallConv, bool isVarArg,
346 const SmallVectorImpl<ISD::OutputArg> &Outs,
347 const SmallVectorImpl<SDValue> &OutVals,
348 DebugLoc dl, SelectionDAG &DAG) const;
350 virtual MachineBasicBlock *
351 EmitInstrWithCustomInserter(MachineInstr *MI,
352 MachineBasicBlock *MBB) const;
354 // Inline asm support
355 ConstraintType getConstraintType(const std::string &Constraint) const;
357 /// Examine constraint string and operand type and determine a weight value.
358 /// The operand object must already have been set up with the operand type.
359 ConstraintWeight getSingleConstraintMatchWeight(
360 AsmOperandInfo &info, const char *constraint) const;
362 std::pair<unsigned, const TargetRegisterClass*>
363 getRegForInlineAsmConstraint(const std::string &Constraint,
366 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
367 /// vector. If it is invalid, don't add anything to Ops. If hasMemory is
368 /// true it means one of the asm constraint of the inline asm instruction
369 /// being processed is 'm'.
370 virtual void LowerAsmOperandForConstraint(SDValue Op,
371 std::string &Constraint,
372 std::vector<SDValue> &Ops,
373 SelectionDAG &DAG) const;
375 virtual bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const;
377 virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
379 virtual EVT getOptimalMemOpType(uint64_t Size, unsigned DstAlign,
381 bool IsMemset, bool ZeroMemset,
383 MachineFunction &MF) const;
385 /// isFPImmLegal - Returns true if the target can instruction select the
386 /// specified FP immediate natively. If false, the legalizer will
387 /// materialize the FP immediate as a load from a constant pool.
388 virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const;
390 virtual unsigned getJumpTableEncoding() const;
392 MachineBasicBlock *EmitBPOSGE32(MachineInstr *MI,
393 MachineBasicBlock *BB) const;
394 MachineBasicBlock *EmitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
395 unsigned Size, unsigned BinOpcode, bool Nand = false) const;
396 MachineBasicBlock *EmitAtomicBinaryPartword(MachineInstr *MI,
397 MachineBasicBlock *BB, unsigned Size, unsigned BinOpcode,
398 bool Nand = false) const;
399 MachineBasicBlock *EmitAtomicCmpSwap(MachineInstr *MI,
400 MachineBasicBlock *BB, unsigned Size) const;
401 MachineBasicBlock *EmitAtomicCmpSwapPartword(MachineInstr *MI,
402 MachineBasicBlock *BB, unsigned Size) const;
406 #endif // MipsISELLOWERING_H