//===-- llvm/CodeGen/SelectionDAG.h - InstSelection DAG ---------*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
-//
+//
// This file declares the SelectionDAG class, and transitively defines the
// SDNode class and subclasses.
-//
+//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_SELECTIONDAG_H
/// linear form.
///
class SelectionDAG {
- const TargetMachine &TM;
+ TargetLowering &TLI;
MachineFunction &MF;
// Root - The root of the entire DAG. EntryNode - The starting token.
// AllNodes - All of the nodes in the DAG
std::vector<SDNode*> AllNodes;
- // Maps to auto-CSE operations.
- std::map<std::pair<unsigned, std::pair<SDOperand, MVT::ValueType> >,
- SDNode *> UnaryOps;
- std::map<std::pair<unsigned, std::pair<SDOperand, SDOperand> >,
- SDNode *> BinaryOps;
-
- std::map<std::pair<std::pair<SDOperand, SDOperand>, ISD::CondCode>,
- SetCCSDNode*> SetCCs;
+ // ValueNodes - track SrcValue nodes
+ std::map<std::pair<const Value*, int>, SDNode*> ValueNodes;
- std::map<std::pair<SDOperand, std::pair<SDOperand, MVT::ValueType> >,
- SDNode *> Loads;
-
- std::map<const GlobalValue*, SDNode*> GlobalValues;
- std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> Constants;
- std::map<std::pair<double, MVT::ValueType>, SDNode*> ConstantFPs;
- std::map<int, SDNode*> FrameIndices;
- std::map<unsigned, SDNode*> ConstantPoolIndices;
- std::map<MachineBasicBlock *, SDNode*> BBNodes;
- std::map<std::string, SDNode*> ExternalSymbols;
public:
- SelectionDAG(const TargetMachine &tm, MachineFunction &mf) : TM(tm), MF(mf) {
+ SelectionDAG(TargetLowering &tli, MachineFunction &mf) : TLI(tli), MF(mf) {
EntryNode = Root = getNode(ISD::EntryToken, MVT::Other);
}
~SelectionDAG();
MachineFunction &getMachineFunction() const { return MF; }
- const TargetMachine &getTarget() { return TM; }
+ const TargetMachine &getTarget() const;
+ TargetLowering &getTargetLoweringInfo() const { return TLI; }
/// viewGraph - Pop up a ghostview window with the DAG rendered using 'dot'.
///
typedef std::vector<SDNode*>::const_iterator allnodes_iterator;
allnodes_iterator allnodes_begin() const { return AllNodes.begin(); }
allnodes_iterator allnodes_end() const { return AllNodes.end(); }
-
+
/// getRoot - Return the root tag of the SelectionDAG.
///
const SDOperand &getRoot() const { return Root; }
///
/// Note that this is an involved process that may invalidate pointers into
/// the graph.
- void Legalize(TargetLowering &TLI);
+ void Legalize();
/// RemoveDeadNodes - This method deletes all unreachable nodes in the
/// SelectionDAG, including nodes (like loads) that have uses of their token
void RemoveDeadNodes(SDNode *N = 0);
SDOperand getConstant(uint64_t Val, MVT::ValueType VT);
+ SDOperand getTargetConstant(uint64_t Val, MVT::ValueType VT);
SDOperand getConstantFP(double Val, MVT::ValueType VT);
SDOperand getGlobalAddress(const GlobalValue *GV, MVT::ValueType VT);
+ SDOperand getTargetGlobalAddress(const GlobalValue *GV, MVT::ValueType VT);
SDOperand getFrameIndex(int FI, MVT::ValueType VT);
SDOperand getConstantPool(unsigned CPIdx, MVT::ValueType VT);
SDOperand getBasicBlock(MachineBasicBlock *MBB);
SDOperand getExternalSymbol(const char *Sym, MVT::ValueType VT);
+ SDOperand getValueType(MVT::ValueType);
+ SDOperand getRegister(unsigned Reg, MVT::ValueType VT);
- SDOperand getCopyToReg(SDOperand Chain, SDOperand N, unsigned Reg) {
- // Note: these are auto-CSE'd because the caller doesn't make requests that
- // could cause duplicates to occur.
- SDNode *NN = new RegSDNode(Chain, N, Reg);
- AllNodes.push_back(NN);
- return SDOperand(NN, 0);
+ SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N) {
+ return getNode(ISD::CopyToReg, MVT::Other, Chain,
+ getRegister(Reg, N.getValueType()), N);
}
- SDOperand getCopyFromReg(unsigned Reg, MVT::ValueType VT) {
- // Note: These nodes are auto-CSE'd by the caller of this method.
- SDNode *NN = new RegSDNode(ISD::CopyFromReg, Reg, VT);
- AllNodes.push_back(NN);
- return SDOperand(NN, 0);
+ SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT) {
+ std::vector<MVT::ValueType> ResultTys;
+ ResultTys.push_back(VT);
+ ResultTys.push_back(MVT::Other);
+ std::vector<SDOperand> Ops;
+ Ops.push_back(Chain);
+ Ops.push_back(getRegister(Reg, VT));
+ return getNode(ISD::CopyFromReg, ResultTys, Ops);
}
- SDOperand getImplicitDef(unsigned Reg) {
- // Note: These nodes are auto-CSE'd by the caller of this method.
- SDNode *NN = new RegSDNode(ISD::ImplicitDef, Reg, MVT::Other);
- AllNodes.push_back(NN);
- return SDOperand(NN, 0);
+ SDOperand getImplicitDef(SDOperand Chain, unsigned Reg, MVT::ValueType VT) {
+ return getNode(ISD::ImplicitDef, MVT::Other, Chain, getRegister(Reg, VT));
}
/// getCall - Note that this destroys the vector of RetVals passed in.
///
SDNode *getCall(std::vector<MVT::ValueType> &RetVals, SDOperand Chain,
- SDOperand Callee) {
- SDNode *NN = new SDNode(ISD::CALL, Chain, Callee);
+ SDOperand Callee, bool isTailCall = false) {
+ SDNode *NN = new SDNode(isTailCall ? ISD::TAILCALL : ISD::CALL, Chain,
+ Callee);
NN->setValueTypes(RetVals);
AllNodes.push_back(NN);
return NN;
}
- SDOperand getSetCC(ISD::CondCode, SDOperand LHS, SDOperand RHS);
+ /// getCall - This is identical to the one above, and should be used for calls
+ /// where arguments are passed in physical registers. This destroys the
+ /// RetVals and ArgsInRegs vectors.
+ SDNode *getCall(std::vector<MVT::ValueType> &RetVals, SDOperand Chain,
+ SDOperand Callee, std::vector<SDOperand> &ArgsInRegs,
+ bool isTailCall = false) {
+ ArgsInRegs.insert(ArgsInRegs.begin(), Callee);
+ ArgsInRegs.insert(ArgsInRegs.begin(), Chain);
+ SDNode *NN = new SDNode(isTailCall ? ISD::TAILCALL : ISD::CALL, ArgsInRegs);
+ NN->setValueTypes(RetVals);
+ AllNodes.push_back(NN);
+ return NN;
+ }
+
+ SDOperand getCondCode(ISD::CondCode Cond);
+
+ /// getZeroExtendInReg - Return the expression required to zero extend the Op
+ /// value assuming it was the smaller SrcTy value.
+ SDOperand getZeroExtendInReg(SDOperand Op, MVT::ValueType SrcTy);
/// getNode - Gets or creates the specified node.
///
SDOperand N1, SDOperand N2);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand N1, SDOperand N2, SDOperand N3);
+ SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
+ SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4);
+ SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
+ SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4,
+ SDOperand N5);
SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
std::vector<SDOperand> &Children);
+ SDOperand getNode(unsigned Opcode, std::vector<MVT::ValueType> &ResultTys,
+ std::vector<SDOperand> &Ops);
+
+ /// getSetCC - Helper function to make it easier to build SetCC's if you just
+ /// have an ISD::CondCode instead of an SDOperand.
+ ///
+ SDOperand getSetCC(MVT::ValueType VT, SDOperand LHS, SDOperand RHS,
+ ISD::CondCode Cond) {
+ return getNode(ISD::SETCC, VT, LHS, RHS, getCondCode(Cond));
+ }
+
+ /// getSelectCC - Helper function to make it easier to build SelectCC's if you
+ /// just have an ISD::CondCode instead of an SDOperand.
+ ///
+ SDOperand getSelectCC(SDOperand LHS, SDOperand RHS,
+ SDOperand True, SDOperand False, ISD::CondCode Cond) {
+ MVT::ValueType VT = True.getValueType();
+ return getNode(ISD::SELECT_CC, VT, LHS, RHS, True, False,getCondCode(Cond));
+ }
+
+ /// getBR2Way_CC - Helper function to make it easier to build BRTWOWAY_CC
+ /// nodes.
+ ///
+ SDOperand getBR2Way_CC(SDOperand Chain, SDOperand CCNode, SDOperand LHS,
+ SDOperand RHS, SDOperand True, SDOperand False) {
+ std::vector<SDOperand> Ops;
+ Ops.push_back(Chain);
+ Ops.push_back(CCNode);
+ Ops.push_back(LHS);
+ Ops.push_back(RHS);
+ Ops.push_back(True);
+ Ops.push_back(False);
+ return getNode(ISD::BRTWOWAY_CC, MVT::Other, Ops);
+ }
/// getLoad - Loads are not normal binary operators: their result type is not
/// determined by their operands, and they produce a value AND a token chain.
///
- SDOperand getLoad(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr);
+ SDOperand getLoad(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
+ SDOperand SV);
+ SDOperand getExtLoad(unsigned Opcode, MVT::ValueType VT, SDOperand Chain,
+ SDOperand Ptr, SDOperand SV, MVT::ValueType EVT);
- void replaceAllUsesWith(SDOperand Old, SDOperand New) {
- assert(Old != New && "RAUW self!");
- assert(0 && "Unimplemented!");
- }
+ // getSrcValue - construct a node to track a Value* through the backend
+ SDOperand getSrcValue(const Value* I, int offset = 0);
+
+ /// SelectNodeTo - These are used for target selectors to *mutate* the
+ /// specified node to have the specified return type, Target opcode, and
+ /// operands. Note that target opcodes are stored as
+ /// ISD::BUILTIN_OP_END+TargetOpcode in the node opcode field.
+ void SelectNodeTo(SDNode *N, MVT::ValueType VT, unsigned TargetOpc,
+ SDOperand Op1);
+ void SelectNodeTo(SDNode *N, MVT::ValueType VT, unsigned TargetOpc,
+ SDOperand Op1, SDOperand Op2);
+ void SelectNodeTo(SDNode *N, MVT::ValueType VT, unsigned TargetOpc,
+ SDOperand Op1, SDOperand Op2, SDOperand Op3);
+ void SelectNodeTo(SDNode *N, MVT::ValueType VT, unsigned TargetOpc,
+ SDOperand Op1, SDOperand Op2, SDOperand Op3, SDOperand Op4);
+
+ SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
+ SDOperand Op1) {
+ return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1);
+ }
+ SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
+ SDOperand Op1, SDOperand Op2) {
+ return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1, Op2);
+ }
+ SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
+ SDOperand Op1, SDOperand Op2, SDOperand Op3) {
+ return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1, Op2, Op3);
+ }
+ SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
+ SDOperand Op1, SDOperand Op2, SDOperand Op3,
+ SDOperand Op4) {
+ return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1, Op2, Op3, Op4);
+ }
+ SDOperand getTargetNode(unsigned Opcode, MVT::ValueType VT,
+ SDOperand Op1, SDOperand Op2, SDOperand Op3,
+ SDOperand Op4, SDOperand Op5) {
+ return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1, Op2, Op3, Op4, Op5);
+ }
+
+ /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
+ /// This can cause recursive merging of nodes in the DAG.
+ ///
+ void ReplaceAllUsesWith(SDNode *From, SDNode *To);
+
void dump() const;
private:
+ void RemoveNodeFromCSEMaps(SDNode *N);
+ SDNode *AddNonLeafNodeToCSEMaps(SDNode *N);
void DeleteNodeIfDead(SDNode *N, void *NodeSet);
+
+ /// SimplifySetCC - Try to simplify a setcc built with the specified operands
+ /// and cc. If unable to simplify it, return a null SDOperand.
+ SDOperand SimplifySetCC(MVT::ValueType VT, SDOperand N1,
+ SDOperand N2, ISD::CondCode Cond);
+
+ /// SimplifySelectCC - Try to simplify a select_cc built with the specified
+ /// operands and cc. This can be used to simplify both the select_cc node,
+ /// and a select node whose first operand is a setcc.
+ SDOperand SimplifySelectCC(SDOperand N1, SDOperand N2, SDOperand N3,
+ SDOperand N4, ISD::CondCode CC);
+
+ // Maps to auto-CSE operations.
+ std::map<std::pair<unsigned, std::pair<SDOperand, MVT::ValueType> >,
+ SDNode *> UnaryOps;
+ std::map<std::pair<unsigned, std::pair<SDOperand, SDOperand> >,
+ SDNode *> BinaryOps;
+
+ std::vector<RegisterSDNode*> RegNodes;
+ std::vector<CondCodeSDNode*> CondCodeNodes;
+
+ std::map<std::pair<SDOperand, std::pair<SDOperand, MVT::ValueType> >,
+ SDNode *> Loads;
+
+ std::map<const GlobalValue*, SDNode*> GlobalValues;
+ std::map<const GlobalValue*, SDNode*> TargetGlobalValues;
+ std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> Constants;
+ std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> TargetConstants;
+ std::map<std::pair<uint64_t, MVT::ValueType>, SDNode*> ConstantFPs;
+ std::map<int, SDNode*> FrameIndices;
+ std::map<unsigned, SDNode*> ConstantPoolIndices;
+ std::map<MachineBasicBlock *, SDNode*> BBNodes;
+ std::vector<SDNode*> ValueTypeNodes;
+ std::map<std::string, SDNode*> ExternalSymbols;
+ std::map<std::pair<unsigned,
+ std::pair<MVT::ValueType, std::vector<SDOperand> > >,
+ SDNode*> OneResultNodes;
+ std::map<std::pair<unsigned,
+ std::pair<std::vector<MVT::ValueType>,
+ std::vector<SDOperand> > >,
+ SDNode*> ArbitraryNodes;
};
template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> {
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