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498 lines
22 KiB
C++
498 lines
22 KiB
C++
//===-- llvm/CodeGen/SelectionDAG.h - InstSelection DAG ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the SelectionDAG class, and transitively defines the
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// SDNode class and subclasses.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_SELECTIONDAG_H
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#define LLVM_CODEGEN_SELECTIONDAG_H
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/ADT/ilist"
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#include "llvm/CodeGen/SelectionDAGNodes.h"
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#include <list>
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#include <vector>
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#include <map>
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#include <set>
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#include <string>
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namespace llvm {
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class AliasAnalysis;
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class TargetLowering;
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class TargetMachine;
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class MachineModuleInfo;
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class MachineFunction;
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class MachineConstantPoolValue;
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/// SelectionDAG class - This is used to represent a portion of an LLVM function
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/// in a low-level Data Dependence DAG representation suitable for instruction
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/// selection. This DAG is constructed as the first step of instruction
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/// selection in order to allow implementation of machine specific optimizations
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/// and code simplifications.
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///
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/// The representation used by the SelectionDAG is a target-independent
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/// representation, which has some similarities to the GCC RTL representation,
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/// but is significantly more simple, powerful, and is a graph form instead of a
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/// linear form.
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///
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class SelectionDAG {
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TargetLowering &TLI;
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MachineFunction &MF;
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MachineModuleInfo *MMI;
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/// Root - The root of the entire DAG. EntryNode - The starting token.
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SDOperand Root, EntryNode;
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/// AllNodes - A linked list of nodes in the current DAG.
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ilist<SDNode> AllNodes;
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/// CSEMap - This structure is used to memoize nodes, automatically performing
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/// CSE with existing nodes with a duplicate is requested.
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FoldingSet<SDNode> CSEMap;
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public:
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SelectionDAG(TargetLowering &tli, MachineFunction &mf, MachineModuleInfo *mmi)
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: TLI(tli), MF(mf), MMI(mmi) {
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EntryNode = Root = getNode(ISD::EntryToken, MVT::Other);
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}
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~SelectionDAG();
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MachineFunction &getMachineFunction() const { return MF; }
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const TargetMachine &getTarget() const;
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TargetLowering &getTargetLoweringInfo() const { return TLI; }
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MachineModuleInfo *getMachineModuleInfo() const { return MMI; }
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/// viewGraph - Pop up a GraphViz/gv window with the DAG rendered using 'dot'.
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///
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void viewGraph();
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#ifndef NDEBUG
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std::map<const SDNode *, std::string> NodeGraphAttrs;
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#endif
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/// clearGraphAttrs - Clear all previously defined node graph attributes.
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/// Intended to be used from a debugging tool (eg. gdb).
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void clearGraphAttrs();
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/// setGraphAttrs - Set graph attributes for a node. (eg. "color=red".)
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///
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void setGraphAttrs(const SDNode *N, const char *Attrs);
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/// getGraphAttrs - Get graph attributes for a node. (eg. "color=red".)
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/// Used from getNodeAttributes.
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const std::string getGraphAttrs(const SDNode *N) const;
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/// setGraphColor - Convenience for setting node color attribute.
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///
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void setGraphColor(const SDNode *N, const char *Color);
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typedef ilist<SDNode>::const_iterator allnodes_const_iterator;
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allnodes_const_iterator allnodes_begin() const { return AllNodes.begin(); }
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allnodes_const_iterator allnodes_end() const { return AllNodes.end(); }
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typedef ilist<SDNode>::iterator allnodes_iterator;
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allnodes_iterator allnodes_begin() { return AllNodes.begin(); }
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allnodes_iterator allnodes_end() { return AllNodes.end(); }
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/// getRoot - Return the root tag of the SelectionDAG.
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///
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const SDOperand &getRoot() const { return Root; }
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/// getEntryNode - Return the token chain corresponding to the entry of the
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/// function.
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const SDOperand &getEntryNode() const { return EntryNode; }
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/// setRoot - Set the current root tag of the SelectionDAG.
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///
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const SDOperand &setRoot(SDOperand N) { return Root = N; }
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/// Combine - This iterates over the nodes in the SelectionDAG, folding
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/// certain types of nodes together, or eliminating superfluous nodes. When
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/// the AfterLegalize argument is set to 'true', Combine takes care not to
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/// generate any nodes that will be illegal on the target.
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void Combine(bool AfterLegalize, AliasAnalysis &AA);
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/// Legalize - This transforms the SelectionDAG into a SelectionDAG that is
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/// compatible with the target instruction selector, as indicated by the
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/// TargetLowering object.
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///
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/// Note that this is an involved process that may invalidate pointers into
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/// the graph.
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void Legalize();
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/// RemoveDeadNodes - This method deletes all unreachable nodes in the
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/// SelectionDAG.
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void RemoveDeadNodes();
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/// RemoveDeadNode - Remove the specified node from the system. If any of its
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/// operands then becomes dead, remove them as well. The vector Deleted is
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/// populated with nodes that are deleted.
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void RemoveDeadNode(SDNode *N, std::vector<SDNode*> &Deleted);
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/// DeleteNode - Remove the specified node from the system. This node must
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/// have no referrers.
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void DeleteNode(SDNode *N);
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/// getVTList - Return an SDVTList that represents the list of values
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/// specified.
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SDVTList getVTList(MVT::ValueType VT);
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SDVTList getVTList(MVT::ValueType VT1, MVT::ValueType VT2);
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SDVTList getVTList(MVT::ValueType VT1, MVT::ValueType VT2,MVT::ValueType VT3);
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SDVTList getVTList(const MVT::ValueType *VTs, unsigned NumVTs);
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/// getNodeValueTypes - These are obsolete, use getVTList instead.
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const MVT::ValueType *getNodeValueTypes(MVT::ValueType VT) {
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return getVTList(VT).VTs;
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}
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const MVT::ValueType *getNodeValueTypes(MVT::ValueType VT1,
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MVT::ValueType VT2) {
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return getVTList(VT1, VT2).VTs;
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}
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const MVT::ValueType *getNodeValueTypes(MVT::ValueType VT1,MVT::ValueType VT2,
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MVT::ValueType VT3) {
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return getVTList(VT1, VT2, VT3).VTs;
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}
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const MVT::ValueType *getNodeValueTypes(std::vector<MVT::ValueType> &VTList) {
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return getVTList(&VTList[0], VTList.size()).VTs;
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}
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//===--------------------------------------------------------------------===//
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// Node creation methods.
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//
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SDOperand getString(const std::string &Val);
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SDOperand getConstant(uint64_t Val, MVT::ValueType VT, bool isTarget = false);
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SDOperand getTargetConstant(uint64_t Val, MVT::ValueType VT) {
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return getConstant(Val, VT, true);
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}
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SDOperand getConstantFP(double Val, MVT::ValueType VT, bool isTarget = false);
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SDOperand getTargetConstantFP(double Val, MVT::ValueType VT) {
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return getConstantFP(Val, VT, true);
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}
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SDOperand getGlobalAddress(const GlobalValue *GV, MVT::ValueType VT,
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int offset = 0, bool isTargetGA = false);
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SDOperand getTargetGlobalAddress(const GlobalValue *GV, MVT::ValueType VT,
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int offset = 0) {
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return getGlobalAddress(GV, VT, offset, true);
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}
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SDOperand getFrameIndex(int FI, MVT::ValueType VT, bool isTarget = false);
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SDOperand getTargetFrameIndex(int FI, MVT::ValueType VT) {
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return getFrameIndex(FI, VT, true);
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}
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SDOperand getJumpTable(int JTI, MVT::ValueType VT, bool isTarget = false);
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SDOperand getTargetJumpTable(int JTI, MVT::ValueType VT) {
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return getJumpTable(JTI, VT, true);
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}
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SDOperand getConstantPool(Constant *C, MVT::ValueType VT,
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unsigned Align = 0, int Offs = 0, bool isT=false);
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SDOperand getTargetConstantPool(Constant *C, MVT::ValueType VT,
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unsigned Align = 0, int Offset = 0) {
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return getConstantPool(C, VT, Align, Offset, true);
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}
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SDOperand getConstantPool(MachineConstantPoolValue *C, MVT::ValueType VT,
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unsigned Align = 0, int Offs = 0, bool isT=false);
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SDOperand getTargetConstantPool(MachineConstantPoolValue *C,
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MVT::ValueType VT, unsigned Align = 0,
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int Offset = 0) {
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return getConstantPool(C, VT, Align, Offset, true);
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}
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SDOperand getBasicBlock(MachineBasicBlock *MBB);
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SDOperand getExternalSymbol(const char *Sym, MVT::ValueType VT);
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SDOperand getTargetExternalSymbol(const char *Sym, MVT::ValueType VT);
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SDOperand getValueType(MVT::ValueType);
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SDOperand getRegister(unsigned Reg, MVT::ValueType VT);
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SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N) {
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return getNode(ISD::CopyToReg, MVT::Other, Chain,
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getRegister(Reg, N.getValueType()), N);
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}
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// This version of the getCopyToReg method takes an extra operand, which
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// indicates that there is potentially an incoming flag value (if Flag is not
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// null) and that there should be a flag result.
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SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N,
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SDOperand Flag) {
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const MVT::ValueType *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
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SDOperand Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Flag };
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return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.Val ? 4 : 3);
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}
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// Similar to last getCopyToReg() except parameter Reg is a SDOperand
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SDOperand getCopyToReg(SDOperand Chain, SDOperand Reg, SDOperand N,
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SDOperand Flag) {
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const MVT::ValueType *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
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SDOperand Ops[] = { Chain, Reg, N, Flag };
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return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.Val ? 4 : 3);
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}
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SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT) {
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const MVT::ValueType *VTs = getNodeValueTypes(VT, MVT::Other);
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SDOperand Ops[] = { Chain, getRegister(Reg, VT) };
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return getNode(ISD::CopyFromReg, VTs, 2, Ops, 2);
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}
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// This version of the getCopyFromReg method takes an extra operand, which
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// indicates that there is potentially an incoming flag value (if Flag is not
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// null) and that there should be a flag result.
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SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT,
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SDOperand Flag) {
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const MVT::ValueType *VTs = getNodeValueTypes(VT, MVT::Other, MVT::Flag);
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SDOperand Ops[] = { Chain, getRegister(Reg, VT), Flag };
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return getNode(ISD::CopyFromReg, VTs, 3, Ops, Flag.Val ? 3 : 2);
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}
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SDOperand getCondCode(ISD::CondCode Cond);
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/// getZeroExtendInReg - Return the expression required to zero extend the Op
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/// value assuming it was the smaller SrcTy value.
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SDOperand getZeroExtendInReg(SDOperand Op, MVT::ValueType SrcTy);
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/// getCALLSEQ_START - Return a new CALLSEQ_START node, which always must have
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/// a flag result (to ensure it's not CSE'd).
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SDOperand getCALLSEQ_START(SDOperand Chain, SDOperand Op) {
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const MVT::ValueType *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
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SDOperand Ops[] = { Chain, Op };
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return getNode(ISD::CALLSEQ_START, VTs, 2, Ops, 2);
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}
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/// getNode - Gets or creates the specified node.
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///
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SDOperand getNode(unsigned Opcode, MVT::ValueType VT);
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SDOperand getNode(unsigned Opcode, MVT::ValueType VT, SDOperand N);
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SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
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SDOperand N1, SDOperand N2);
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SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
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SDOperand N1, SDOperand N2, SDOperand N3);
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SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
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SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4);
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SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
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SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4,
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SDOperand N5);
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SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
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const SDOperand *Ops, unsigned NumOps);
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SDOperand getNode(unsigned Opcode, std::vector<MVT::ValueType> &ResultTys,
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const SDOperand *Ops, unsigned NumOps);
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SDOperand getNode(unsigned Opcode, const MVT::ValueType *VTs, unsigned NumVTs,
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const SDOperand *Ops, unsigned NumOps);
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SDOperand getNode(unsigned Opcode, SDVTList VTs,
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const SDOperand *Ops, unsigned NumOps);
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/// getSetCC - Helper function to make it easier to build SetCC's if you just
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/// have an ISD::CondCode instead of an SDOperand.
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///
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SDOperand getSetCC(MVT::ValueType VT, SDOperand LHS, SDOperand RHS,
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ISD::CondCode Cond) {
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return getNode(ISD::SETCC, VT, LHS, RHS, getCondCode(Cond));
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}
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/// getSelectCC - Helper function to make it easier to build SelectCC's if you
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/// just have an ISD::CondCode instead of an SDOperand.
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///
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SDOperand getSelectCC(SDOperand LHS, SDOperand RHS,
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SDOperand True, SDOperand False, ISD::CondCode Cond) {
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return getNode(ISD::SELECT_CC, True.getValueType(), LHS, RHS, True, False,
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getCondCode(Cond));
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}
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/// getVAArg - VAArg produces a result and token chain, and takes a pointer
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/// and a source value as input.
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SDOperand getVAArg(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
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SDOperand SV);
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/// getLoad - Loads are not normal binary operators: their result type is not
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/// determined by their operands, and they produce a value AND a token chain.
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///
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SDOperand getLoad(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
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const Value *SV, int SVOffset, bool isVolatile=false);
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SDOperand getExtLoad(ISD::LoadExtType ExtType, MVT::ValueType VT,
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SDOperand Chain, SDOperand Ptr, const Value *SV,
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int SVOffset, MVT::ValueType EVT, bool isVolatile=false);
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SDOperand getIndexedLoad(SDOperand OrigLoad, SDOperand Base,
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SDOperand Offset, ISD::MemIndexedMode AM);
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SDOperand getVecLoad(unsigned Count, MVT::ValueType VT, SDOperand Chain,
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SDOperand Ptr, SDOperand SV);
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/// getStore - Helper function to build ISD::STORE nodes.
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///
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SDOperand getStore(SDOperand Chain, SDOperand Val, SDOperand Ptr,
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const Value *SV, int SVOffset, bool isVolatile=false);
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SDOperand getTruncStore(SDOperand Chain, SDOperand Val, SDOperand Ptr,
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const Value *SV, int SVOffset, MVT::ValueType TVT,
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bool isVolatile=false);
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SDOperand getIndexedStore(SDOperand OrigStoe, SDOperand Base,
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SDOperand Offset, ISD::MemIndexedMode AM);
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// getSrcValue - construct a node to track a Value* through the backend
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SDOperand getSrcValue(const Value* I, int offset = 0);
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/// UpdateNodeOperands - *Mutate* the specified node in-place to have the
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/// specified operands. If the resultant node already exists in the DAG,
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/// this does not modify the specified node, instead it returns the node that
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/// already exists. If the resultant node does not exist in the DAG, the
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/// input node is returned. As a degenerate case, if you specify the same
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/// input operands as the node already has, the input node is returned.
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SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op);
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SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2);
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SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
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SDOperand Op3);
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SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
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SDOperand Op3, SDOperand Op4);
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SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
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SDOperand Op3, SDOperand Op4, SDOperand Op5);
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SDOperand UpdateNodeOperands(SDOperand N, SDOperand *Ops, unsigned NumOps);
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/// SelectNodeTo - These are used for target selectors to *mutate* the
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/// specified node to have the specified return type, Target opcode, and
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/// operands. Note that target opcodes are stored as
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/// ISD::BUILTIN_OP_END+TargetOpcode in the node opcode field. The 0th value
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/// of the resultant node is returned.
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SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT);
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SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
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SDOperand Op1);
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SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
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SDOperand Op1, SDOperand Op2);
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SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
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SDOperand Op1, SDOperand Op2, SDOperand Op3);
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SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
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const SDOperand *Ops, unsigned NumOps);
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SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
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MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
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SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
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MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
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SDOperand Op3);
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/// getTargetNode - These are used for target selectors to create a new node
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/// with specified return type(s), target opcode, and operands.
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///
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/// Note that getTargetNode returns the resultant node. If there is already a
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/// node of the specified opcode and operands, it returns that node instead of
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/// the current one.
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SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT);
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SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
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SDOperand Op1);
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SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
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SDOperand Op1, SDOperand Op2);
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SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
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SDOperand Op1, SDOperand Op2, SDOperand Op3);
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SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
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const SDOperand *Ops, unsigned NumOps);
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SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
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MVT::ValueType VT2, SDOperand Op1);
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SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
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MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
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SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
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MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
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SDOperand Op3);
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SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
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MVT::ValueType VT2,
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const SDOperand *Ops, unsigned NumOps);
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SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
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MVT::ValueType VT2, MVT::ValueType VT3,
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SDOperand Op1, SDOperand Op2);
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SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
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MVT::ValueType VT2, MVT::ValueType VT3,
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const SDOperand *Ops, unsigned NumOps);
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/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
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/// This can cause recursive merging of nodes in the DAG. Use the first
|
|
/// version if 'From' is known to have a single result, use the second
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|
/// if you have two nodes with identical results, use the third otherwise.
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|
///
|
|
/// These methods all take an optional vector, which (if not null) is
|
|
/// populated with any nodes that are deleted from the SelectionDAG, due to
|
|
/// new equivalences that are discovered.
|
|
///
|
|
void ReplaceAllUsesWith(SDOperand From, SDOperand Op,
|
|
std::vector<SDNode*> *Deleted = 0);
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|
void ReplaceAllUsesWith(SDNode *From, SDNode *To,
|
|
std::vector<SDNode*> *Deleted = 0);
|
|
void ReplaceAllUsesWith(SDNode *From, const SDOperand *To,
|
|
std::vector<SDNode*> *Deleted = 0);
|
|
|
|
/// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
|
|
/// uses of other values produced by From.Val alone. The Deleted vector is
|
|
/// handled the same was as for ReplaceAllUsesWith, but it is required for
|
|
/// this method.
|
|
void ReplaceAllUsesOfValueWith(SDOperand From, SDOperand To,
|
|
std::vector<SDNode*> &Deleted);
|
|
|
|
/// AssignNodeIds - Assign a unique node id for each node in the DAG based on
|
|
/// their allnodes order. It returns the maximum id.
|
|
unsigned AssignNodeIds();
|
|
|
|
/// AssignTopologicalOrder - Assign a unique node id for each node in the DAG
|
|
/// based on their topological order. It returns the maximum id and a vector
|
|
/// of the SDNodes* in assigned order by reference.
|
|
unsigned AssignTopologicalOrder(std::vector<SDNode*> &TopOrder);
|
|
|
|
/// isCommutativeBinOp - Returns true if the opcode is a commutative binary
|
|
/// operation.
|
|
static bool isCommutativeBinOp(unsigned Opcode) {
|
|
switch (Opcode) {
|
|
case ISD::ADD:
|
|
case ISD::MUL:
|
|
case ISD::MULHU:
|
|
case ISD::MULHS:
|
|
case ISD::FADD:
|
|
case ISD::FMUL:
|
|
case ISD::AND:
|
|
case ISD::OR:
|
|
case ISD::XOR:
|
|
case ISD::ADDC:
|
|
case ISD::ADDE: return true;
|
|
default: return false;
|
|
}
|
|
}
|
|
|
|
void dump() const;
|
|
|
|
/// FoldSetCC - Constant fold a setcc to true or false.
|
|
SDOperand FoldSetCC(MVT::ValueType VT, SDOperand N1,
|
|
SDOperand N2, ISD::CondCode Cond);
|
|
|
|
private:
|
|
void RemoveNodeFromCSEMaps(SDNode *N);
|
|
SDNode *AddNonLeafNodeToCSEMaps(SDNode *N);
|
|
SDNode *FindModifiedNodeSlot(SDNode *N, SDOperand Op, void *&InsertPos);
|
|
SDNode *FindModifiedNodeSlot(SDNode *N, SDOperand Op1, SDOperand Op2,
|
|
void *&InsertPos);
|
|
SDNode *FindModifiedNodeSlot(SDNode *N, const SDOperand *Ops, unsigned NumOps,
|
|
void *&InsertPos);
|
|
|
|
void DeleteNodeNotInCSEMaps(SDNode *N);
|
|
|
|
// List of non-single value types.
|
|
std::list<std::vector<MVT::ValueType> > VTList;
|
|
|
|
// Maps to auto-CSE operations.
|
|
std::vector<CondCodeSDNode*> CondCodeNodes;
|
|
|
|
std::vector<SDNode*> ValueTypeNodes;
|
|
std::map<std::string, SDNode*> ExternalSymbols;
|
|
std::map<std::string, SDNode*> TargetExternalSymbols;
|
|
std::map<std::string, StringSDNode*> StringNodes;
|
|
};
|
|
|
|
template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> {
|
|
typedef SelectionDAG::allnodes_iterator nodes_iterator;
|
|
static nodes_iterator nodes_begin(SelectionDAG *G) {
|
|
return G->allnodes_begin();
|
|
}
|
|
static nodes_iterator nodes_end(SelectionDAG *G) {
|
|
return G->allnodes_end();
|
|
}
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|