X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FCodeGen%2FSelectionDAGISel.h;h=f22ac902de9df5434f39869728efcea607a0f337;hb=3c7b3fecacee40df7b9a99d290638398b5a62173;hp=d2c0dc420f8a21261ab6fa0023666d842edad1c6;hpb=dac237e18209b697a8ba122d0ddd9cad4dfba1f8;p=oota-llvm.git diff --git a/include/llvm/CodeGen/SelectionDAGISel.h b/include/llvm/CodeGen/SelectionDAGISel.h index d2c0dc420f8..f22ac902de9 100644 --- a/include/llvm/CodeGen/SelectionDAGISel.h +++ b/include/llvm/CodeGen/SelectionDAGISel.h @@ -17,19 +17,17 @@ #include "llvm/BasicBlock.h" #include "llvm/Pass.h" -#include "llvm/Constant.h" #include "llvm/CodeGen/SelectionDAG.h" +#include "llvm/CodeGen/MachineFunctionPass.h" namespace llvm { class FastISel; - class SelectionDAGLowering; + class SelectionDAGBuilder; class SDValue; class MachineRegisterInfo; class MachineBasicBlock; class MachineFunction; class MachineInstr; - class MachineModuleInfo; - class DwarfWriter; class TargetLowering; class TargetInstrInfo; class FunctionLoweringInfo; @@ -39,40 +37,43 @@ namespace llvm { /// SelectionDAGISel - This is the common base class used for SelectionDAG-based /// pattern-matching instruction selectors. -class SelectionDAGISel : public FunctionPass { +class SelectionDAGISel : public MachineFunctionPass { public: const TargetMachine &TM; - TargetLowering &TLI; + const TargetLowering &TLI; FunctionLoweringInfo *FuncInfo; MachineFunction *MF; MachineRegisterInfo *RegInfo; SelectionDAG *CurDAG; - SelectionDAGLowering *SDL; - MachineBasicBlock *BB; + SelectionDAGBuilder *SDB; AliasAnalysis *AA; GCFunctionInfo *GFI; CodeGenOpt::Level OptLevel; static char ID; - explicit SelectionDAGISel(TargetMachine &tm, + explicit SelectionDAGISel(const TargetMachine &tm, CodeGenOpt::Level OL = CodeGenOpt::Default); virtual ~SelectionDAGISel(); - TargetLowering &getTargetLowering() { return TLI; } + const TargetLowering &getTargetLowering() { return TLI; } virtual void getAnalysisUsage(AnalysisUsage &AU) const; - virtual bool runOnFunction(Function &Fn); + virtual bool runOnMachineFunction(MachineFunction &MF); - unsigned MakeReg(MVT VT); - - virtual void EmitFunctionEntryCode(Function &Fn, MachineFunction &MF) {} - virtual void InstructionSelect() = 0; + virtual void EmitFunctionEntryCode() {} + + /// PreprocessISelDAG - This hook allows targets to hack on the graph before + /// instruction selection starts. + virtual void PreprocessISelDAG() {} + + /// PostprocessISelDAG() - This hook allows the target to hack on the graph + /// right after selection. + virtual void PostprocessISelDAG() {} + + /// Select - Main hook targets implement to select a node. + virtual SDNode *Select(SDNode *N) = 0; - void SelectRootInit() { - DAGSize = CurDAG->AssignTopologicalOrder(); - } - /// SelectInlineAsmMemoryOperand - Select the specified address as a target /// addressing mode, according to the specified constraint code. If this does /// not match or is not implemented, return true. The resultant operands @@ -84,55 +85,230 @@ public: return true; } - /// IsLegalAndProfitableToFold - Returns true if the specific operand node N of - /// U can be folded during instruction selection that starts at Root and - /// folding N is profitable. - virtual - bool IsLegalAndProfitableToFold(SDNode *N, SDNode *U, SDNode *Root) const; + /// IsProfitableToFold - Returns true if it's profitable to fold the specific + /// operand node N of U during instruction selection that starts at Root. + virtual bool IsProfitableToFold(SDValue N, SDNode *U, SDNode *Root) const; + + /// IsLegalToFold - Returns true if the specific operand node N of + /// U can be folded during instruction selection that starts at Root. + /// FIXME: This is a static member function because the PIC16 target, + /// which uses it during lowering. + static bool IsLegalToFold(SDValue N, SDNode *U, SDNode *Root, + CodeGenOpt::Level OptLevel, + bool IgnoreChains = false); /// CreateTargetHazardRecognizer - Return a newly allocated hazard recognizer /// to use for this target when scheduling the DAG. virtual ScheduleHazardRecognizer *CreateTargetHazardRecognizer(); + + // Opcodes used by the DAG state machine: + enum BuiltinOpcodes { + OPC_Scope, + OPC_RecordNode, + OPC_RecordChild0, OPC_RecordChild1, OPC_RecordChild2, OPC_RecordChild3, + OPC_RecordChild4, OPC_RecordChild5, OPC_RecordChild6, OPC_RecordChild7, + OPC_RecordMemRef, + OPC_CaptureFlagInput, + OPC_MoveChild, + OPC_MoveParent, + OPC_CheckSame, + OPC_CheckPatternPredicate, + OPC_CheckPredicate, + OPC_CheckOpcode, + OPC_SwitchOpcode, + OPC_CheckType, + OPC_SwitchType, + OPC_CheckChild0Type, OPC_CheckChild1Type, OPC_CheckChild2Type, + OPC_CheckChild3Type, OPC_CheckChild4Type, OPC_CheckChild5Type, + OPC_CheckChild6Type, OPC_CheckChild7Type, + OPC_CheckInteger, + OPC_CheckCondCode, + OPC_CheckValueType, + OPC_CheckComplexPat, + OPC_CheckAndImm, OPC_CheckOrImm, + OPC_CheckFoldableChainNode, + + OPC_EmitInteger, + OPC_EmitRegister, + OPC_EmitConvertToTarget, + OPC_EmitMergeInputChains, + OPC_EmitMergeInputChains1_0, + OPC_EmitMergeInputChains1_1, + OPC_EmitCopyToReg, + OPC_EmitNodeXForm, + OPC_EmitNode, + OPC_MorphNodeTo, + OPC_MarkFlagResults, + OPC_CompleteMatch + }; + + enum { + OPFL_None = 0, // Node has no chain or flag input and isn't variadic. + OPFL_Chain = 1, // Node has a chain input. + OPFL_FlagInput = 2, // Node has a flag input. + OPFL_FlagOutput = 4, // Node has a flag output. + OPFL_MemRefs = 8, // Node gets accumulated MemRefs. + OPFL_Variadic0 = 1<<4, // Node is variadic, root has 0 fixed inputs. + OPFL_Variadic1 = 2<<4, // Node is variadic, root has 1 fixed inputs. + OPFL_Variadic2 = 3<<4, // Node is variadic, root has 2 fixed inputs. + OPFL_Variadic3 = 4<<4, // Node is variadic, root has 3 fixed inputs. + OPFL_Variadic4 = 5<<4, // Node is variadic, root has 4 fixed inputs. + OPFL_Variadic5 = 6<<4, // Node is variadic, root has 5 fixed inputs. + OPFL_Variadic6 = 7<<4, // Node is variadic, root has 6 fixed inputs. + + OPFL_VariadicInfo = OPFL_Variadic6 + }; + + /// getNumFixedFromVariadicInfo - Transform an EmitNode flags word into the + /// number of fixed arity values that should be skipped when copying from the + /// root. + static inline int getNumFixedFromVariadicInfo(unsigned Flags) { + return ((Flags&OPFL_VariadicInfo) >> 4)-1; + } + + protected: /// DAGSize - Size of DAG being instruction selected. /// unsigned DAGSize; + + /// ISelPosition - Node iterator marking the current position of + /// instruction selection as it procedes through the topologically-sorted + /// node list. + SelectionDAG::allnodes_iterator ISelPosition; + + + /// ISelUpdater - helper class to handle updates of the + /// instruction selection graph. + class ISelUpdater : public SelectionDAG::DAGUpdateListener { + SelectionDAG::allnodes_iterator &ISelPosition; + public: + explicit ISelUpdater(SelectionDAG::allnodes_iterator &isp) + : ISelPosition(isp) {} + + /// NodeDeleted - Handle nodes deleted from the graph. If the + /// node being deleted is the current ISelPosition node, update + /// ISelPosition. + /// + virtual void NodeDeleted(SDNode *N, SDNode *E) { + if (ISelPosition == SelectionDAG::allnodes_iterator(N)) + ++ISelPosition; + } + + /// NodeUpdated - Ignore updates for now. + virtual void NodeUpdated(SDNode *N) {} + }; + + /// ReplaceUses - replace all uses of the old node F with the use + /// of the new node T. + void ReplaceUses(SDValue F, SDValue T) { + ISelUpdater ISU(ISelPosition); + CurDAG->ReplaceAllUsesOfValueWith(F, T, &ISU); + } + + /// ReplaceUses - replace all uses of the old nodes F with the use + /// of the new nodes T. + void ReplaceUses(const SDValue *F, const SDValue *T, unsigned Num) { + ISelUpdater ISU(ISelPosition); + CurDAG->ReplaceAllUsesOfValuesWith(F, T, Num, &ISU); + } + + /// ReplaceUses - replace all uses of the old node F with the use + /// of the new node T. + void ReplaceUses(SDNode *F, SDNode *T) { + ISelUpdater ISU(ISelPosition); + CurDAG->ReplaceAllUsesWith(F, T, &ISU); + } + /// SelectInlineAsmMemoryOperands - Calls to this are automatically generated /// by tblgen. Others should not call it. void SelectInlineAsmMemoryOperands(std::vector &Ops); + +public: // Calls to these predicates are generated by tblgen. bool CheckAndMask(SDValue LHS, ConstantSDNode *RHS, int64_t DesiredMaskS) const; bool CheckOrMask(SDValue LHS, ConstantSDNode *RHS, int64_t DesiredMaskS) const; + + /// CheckPatternPredicate - This function is generated by tblgen in the + /// target. It runs the specified pattern predicate and returns true if it + /// succeeds or false if it fails. The number is a private implementation + /// detail to the code tblgen produces. + virtual bool CheckPatternPredicate(unsigned PredNo) const { + assert(0 && "Tblgen should generate the implementation of this!"); + return 0; + } + + /// CheckNodePredicate - This function is generated by tblgen in the target. + /// It runs node predicate number PredNo and returns true if it succeeds or + /// false if it fails. The number is a private implementation + /// detail to the code tblgen produces. + virtual bool CheckNodePredicate(SDNode *N, unsigned PredNo) const { + assert(0 && "Tblgen should generate the implementation of this!"); + return 0; + } + + virtual bool CheckComplexPattern(SDNode *Root, SDValue N, unsigned PatternNo, + SmallVectorImpl &Result) { + assert(0 && "Tblgen should generate the implementation of this!"); + return false; + } + + virtual SDValue RunSDNodeXForm(SDValue V, unsigned XFormNo) { + assert(0 && "Tblgen shoudl generate this!"); + return SDValue(); + } + + SDNode *SelectCodeCommon(SDNode *NodeToMatch, + const unsigned char *MatcherTable, + unsigned TableSize); + private: - void SelectAllBasicBlocks(Function &Fn, MachineFunction &MF, - MachineModuleInfo *MMI, - DwarfWriter *DW, - const TargetInstrInfo &TII); - void FinishBasicBlock(); - - void SelectBasicBlock(BasicBlock *LLVMBB, - BasicBlock::iterator Begin, - BasicBlock::iterator End); - void CodeGenAndEmitDAG(); - void LowerArguments(BasicBlock *BB); - void ComputeLiveOutVRegInfo(); + // Calls to these functions are generated by tblgen. + SDNode *Select_INLINEASM(SDNode *N); + SDNode *Select_UNDEF(SDNode *N); + void CannotYetSelect(SDNode *N); - void HandlePHINodesInSuccessorBlocks(BasicBlock *LLVMBB); +private: + void DoInstructionSelection(); + SDNode *MorphNode(SDNode *Node, unsigned TargetOpc, SDVTList VTs, + const SDValue *Ops, unsigned NumOps, unsigned EmitNodeInfo); + + void PrepareEHLandingPad(MachineBasicBlock *BB); + void SelectAllBasicBlocks(const Function &Fn); + void FinishBasicBlock(MachineBasicBlock *BB); - bool HandlePHINodesInSuccessorBlocksFast(BasicBlock *LLVMBB, FastISel *F); + MachineBasicBlock *SelectBasicBlock(MachineBasicBlock *BB, + const BasicBlock *LLVMBB, + BasicBlock::const_iterator Begin, + BasicBlock::const_iterator End, + bool &HadTailCall); + MachineBasicBlock *CodeGenAndEmitDAG(MachineBasicBlock *BB); + void LowerArguments(const BasicBlock *BB); + + void ComputeLiveOutVRegInfo(); /// Create the scheduler. If a specific scheduler was specified /// via the SchedulerRegistry, use it, otherwise select the /// one preferred by the target. /// ScheduleDAGSDNodes *CreateScheduler(); + + /// OpcodeOffset - This is a cache used to dispatch efficiently into isel + /// state machines that start with a OPC_SwitchOpcode node. + std::vector OpcodeOffset; + + void UpdateChainsAndFlags(SDNode *NodeToMatch, SDValue InputChain, + const SmallVectorImpl &ChainNodesMatched, + SDValue InputFlag,const SmallVectorImpl &F, + bool isMorphNodeTo); + }; }