#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 TargetLowering;
class TargetInstrInfo;
class FunctionLoweringInfo;
- class HazardRecognizer;
+ class ScheduleHazardRecognizer;
class GCFunctionInfo;
- class ScheduleDAG;
+ class ScheduleDAGSDNodes;
/// SelectionDAGISel - This is the common base class used for SelectionDAG-based
/// pattern-matching instruction selectors.
-class SelectionDAGISel : public FunctionPass {
+class SelectionDAGISel : public MachineFunctionPass {
public:
- TargetLowering &TLI;
- MachineRegisterInfo *RegInfo;
+ const TargetMachine &TM;
+ const TargetLowering &TLI;
FunctionLoweringInfo *FuncInfo;
+ MachineFunction *MF;
+ MachineRegisterInfo *RegInfo;
SelectionDAG *CurDAG;
- SelectionDAGLowering *SDL;
- MachineBasicBlock *BB;
+ SelectionDAGBuilder *SDB;
AliasAnalysis *AA;
GCFunctionInfo *GFI;
- bool Fast;
+ CodeGenOpt::Level OptLevel;
static char ID;
- explicit SelectionDAGISel(TargetLowering &tli, bool fast = false);
+ 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
return true;
}
- /// CanBeFoldedBy - Returns true if the specific operand node N of U can be
- /// folded during instruction selection that starts at Root?
- virtual bool CanBeFoldedBy(SDNode *N, SDNode *U, SDNode *Root) const {
- return true;
- }
-
+ /// 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 HazardRecognizer *CreateTargetHazardRecognizer();
+ 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<SDValue> &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;
-private:
- void SelectAllBasicBlocks(Function &Fn, MachineFunction &MF,
- MachineModuleInfo *MMI,
- const TargetInstrInfo &TII);
- void FinishBasicBlock();
+
+ /// 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;
+ }
- void SelectBasicBlock(BasicBlock *LLVMBB,
- BasicBlock::iterator Begin,
- BasicBlock::iterator End);
- void CodeGenAndEmitDAG();
- void LowerArguments(BasicBlock *BB);
+ /// 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;
+ }
- void ComputeLiveOutVRegInfo();
+ virtual bool CheckComplexPattern(SDNode *Root, SDValue N, unsigned PatternNo,
+ SmallVectorImpl<SDValue> &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:
+
+ // 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,
+ BasicBlock::const_iterator Begin,
+ BasicBlock::const_iterator End,
+ bool &HadTailCall);
+ MachineBasicBlock *CodeGenAndEmitDAG(MachineBasicBlock *BB);
+ void LowerArguments(const BasicBlock *BB);
+
+ void ComputeLiveOutVRegInfo();
- /// Pick a safe ordering for instructions for each target node in the
- /// graph.
- ScheduleDAG *Schedule();
+ /// 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<unsigned> OpcodeOffset;
+
+ void UpdateChainsAndFlags(SDNode *NodeToMatch, SDValue InputChain,
+ const SmallVectorImpl<SDNode*> &ChainNodesMatched,
+ SDValue InputFlag,const SmallVectorImpl<SDNode*> &F,
+ bool isMorphNodeTo);
+
};
}
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