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https://github.com/c64scene-ar/llvm-6502.git
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d0fde30ce8
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9903 91177308-0d34-0410-b5e6-96231b3b80d8
340 lines
10 KiB
C++
340 lines
10 KiB
C++
//===-- llvm/CodeGen/InstForest.h -------------------------------*- 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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// Purpose:
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// Convert SSA graph to instruction trees for instruction selection.
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//
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// Strategy:
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// The basic idea is that we would like to group instructions into a single
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// tree if one or more of them might be potentially combined into a single
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// complex instruction in the target machine.
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// Since this grouping is completely machine-independent, it is as
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// aggressive as possible. In particular, we group two instructions
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// O and I if:
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// (1) Instruction O computes an operand of instruction I, and
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// (2) O and I are part of the same basic block, and
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// (3) O has only a single use, viz., I.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_INSTRFOREST_H
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#define LLVM_CODEGEN_INSTRFOREST_H
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#include "llvm/Instruction.h"
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#include "Support/hash_map"
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namespace llvm {
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class Constant;
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class Function;
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class InstrTreeNode;
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class InstrForest;
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} // End llvm namespace
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using namespace llvm;
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//--------------------------------------------------------------------------
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// OpLabel values for special-case nodes created for instruction selection.
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// All op-labels not defined here are identical to the instruction
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// opcode returned by Instruction::getOpcode()
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//--------------------------------------------------------------------------
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//
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const int InvalidOp = -1;
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const int VRegListOp = 97;
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const int VRegNodeOp = 98;
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const int ConstantNodeOp= 99;
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const int LabelNodeOp = 100;
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const int RetValueOp = 100 + Instruction::Ret; // 101
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const int BrCondOp = 100 + Instruction::Br; // 102
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const int BAndOp = 100 + Instruction::And; // 111
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const int BOrOp = 100 + Instruction::Or; // 112
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const int BXorOp = 100 + Instruction::Xor; // 113
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const int BNotOp = 200 + Instruction::Xor; // 213
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const int NotOp = 300 + Instruction::Xor; // 313
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const int SetCCOp = 100 + Instruction::SetEQ; // 114
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const int AllocaN = 100 + Instruction::Alloca; // 122
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const int LoadIdx = 100 + Instruction::Load; // 123
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const int GetElemPtrIdx= 100 + Instruction::GetElementPtr; // 125
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const int ToBoolTy = 100 + Instruction::Cast; // 127
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const int ToUByteTy = ToBoolTy + 1;
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const int ToSByteTy = ToBoolTy + 2;
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const int ToUShortTy = ToBoolTy + 3;
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const int ToShortTy = ToBoolTy + 4;
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const int ToUIntTy = ToBoolTy + 5;
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const int ToIntTy = ToBoolTy + 6;
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const int ToULongTy = ToBoolTy + 7;
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const int ToLongTy = ToBoolTy + 8;
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const int ToFloatTy = ToBoolTy + 9;
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const int ToDoubleTy = ToBoolTy + 10;
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const int ToArrayTy = ToBoolTy + 11;
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const int ToPointerTy = ToBoolTy + 12;
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//-------------------------------------------------------------------------
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// Data types needed by BURG and implemented by us
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//-------------------------------------------------------------------------
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typedef int OpLabel;
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typedef int StateLabel;
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//-------------------------------------------------------------------------
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// Declarations of data and functions created by BURG
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//-------------------------------------------------------------------------
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extern short* burm_nts[];
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extern StateLabel burm_label (InstrTreeNode* p);
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extern StateLabel burm_state (OpLabel op, StateLabel leftState,
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StateLabel rightState);
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extern StateLabel burm_rule (StateLabel state, int goalNT);
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extern InstrTreeNode** burm_kids (InstrTreeNode* p, int eruleno,
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InstrTreeNode* kids[]);
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extern void printcover (InstrTreeNode*, int, int);
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extern void printtree (InstrTreeNode*);
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extern int treecost (InstrTreeNode*, int, int);
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extern void printMatches (InstrTreeNode*);
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namespace llvm {
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//------------------------------------------------------------------------
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// class InstrTreeNode
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//
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// A single tree node in the instruction tree used for
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// instruction selection via BURG.
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//------------------------------------------------------------------------
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class InstrTreeNode {
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InstrTreeNode(const InstrTreeNode &); // DO NOT IMPLEMENT
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void operator=(const InstrTreeNode &); // DO NOT IMPLEMENT
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public:
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enum InstrTreeNodeType { NTInstructionNode,
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NTVRegListNode,
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NTVRegNode,
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NTConstNode,
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NTLabelNode };
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// BASIC TREE NODE START
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InstrTreeNode* LeftChild;
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InstrTreeNode* RightChild;
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InstrTreeNode* Parent;
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OpLabel opLabel;
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StateLabel state;
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// BASIC TREE NODE END
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protected:
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InstrTreeNodeType treeNodeType;
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Value* val;
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public:
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InstrTreeNode(InstrTreeNodeType nodeType, Value* _val)
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: treeNodeType(nodeType), val(_val) {
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LeftChild = RightChild = Parent = 0;
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opLabel = InvalidOp;
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}
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virtual ~InstrTreeNode() {
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delete LeftChild;
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delete RightChild;
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}
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InstrTreeNodeType getNodeType () const { return treeNodeType; }
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Value* getValue () const { return val; }
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inline OpLabel getOpLabel () const { return opLabel; }
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inline InstrTreeNode* leftChild() const {
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return LeftChild;
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}
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// If right child is a list node, recursively get its *left* child
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inline InstrTreeNode* rightChild() const {
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return (!RightChild ? 0 :
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(RightChild->getOpLabel() == VRegListOp
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? RightChild->LeftChild : RightChild));
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}
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inline InstrTreeNode *parent() const {
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return Parent;
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}
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void dump(int dumpChildren, int indent) const;
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protected:
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virtual void dumpNode(int indent) const = 0;
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friend class InstrForest;
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};
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class InstructionNode : public InstrTreeNode {
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private:
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bool codeIsFoldedIntoParent;
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public:
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InstructionNode(Instruction *_instr);
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Instruction *getInstruction() const {
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assert(treeNodeType == NTInstructionNode);
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return cast<Instruction>(val);
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}
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void markFoldedIntoParent() { codeIsFoldedIntoParent = true; }
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bool isFoldedIntoParent() { return codeIsFoldedIntoParent; }
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// Methods to support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const InstructionNode *N) { return true; }
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static inline bool classof(const InstrTreeNode *N) {
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return N->getNodeType() == InstrTreeNode::NTInstructionNode;
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}
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protected:
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virtual void dumpNode(int indent) const;
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};
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class VRegListNode : public InstrTreeNode {
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public:
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VRegListNode() : InstrTreeNode(NTVRegListNode, 0) {
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opLabel = VRegListOp;
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}
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// Methods to support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const VRegListNode *N) { return true; }
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static inline bool classof(const InstrTreeNode *N) {
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return N->getNodeType() == InstrTreeNode::NTVRegListNode;
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}
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protected:
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virtual void dumpNode(int indent) const;
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};
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class VRegNode : public InstrTreeNode {
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public:
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VRegNode(Value* _val) : InstrTreeNode(NTVRegNode, _val) {
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opLabel = VRegNodeOp;
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}
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// Methods to support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const VRegNode *N) { return true; }
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static inline bool classof(const InstrTreeNode *N) {
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return N->getNodeType() == InstrTreeNode::NTVRegNode;
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}
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protected:
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virtual void dumpNode(int indent) const;
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};
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class ConstantNode : public InstrTreeNode {
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public:
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ConstantNode(Constant *constVal)
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: InstrTreeNode(NTConstNode, (Value*)constVal) {
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opLabel = ConstantNodeOp;
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}
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Constant *getConstVal() const { return (Constant*) val;}
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// Methods to support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const ConstantNode *N) { return true; }
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static inline bool classof(const InstrTreeNode *N) {
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return N->getNodeType() == InstrTreeNode::NTConstNode;
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}
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protected:
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virtual void dumpNode(int indent) const;
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};
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class LabelNode : public InstrTreeNode {
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public:
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LabelNode(BasicBlock* BB) : InstrTreeNode(NTLabelNode, (Value*)BB) {
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opLabel = LabelNodeOp;
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}
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BasicBlock *getBasicBlock() const { return (BasicBlock*)val;}
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// Methods to support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const LabelNode *N) { return true; }
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static inline bool classof(const InstrTreeNode *N) {
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return N->getNodeType() == InstrTreeNode::NTLabelNode;
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}
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protected:
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virtual void dumpNode(int indent) const;
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};
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//------------------------------------------------------------------------
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// class InstrForest
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//
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// A forest of instruction trees, usually for a single method.
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//
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// Methods:
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// buildTreesForMethod() Builds the forest of trees for a method
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// getTreeNodeForInstr() Returns the tree node for an Instruction
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// getRootSet() Returns a set of root nodes for all the trees
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//
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//------------------------------------------------------------------------
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class InstrForest : private hash_map<const Instruction *, InstructionNode*> {
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public:
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// Use a vector for the root set to get a deterministic iterator
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// for stable code generation. Even though we need to erase nodes
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// during forest construction, a vector should still be efficient
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// because the elements to erase are nearly always near the end.
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typedef std::vector<InstructionNode*> RootSet;
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typedef RootSet:: iterator root_iterator;
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typedef RootSet::const_iterator const_root_iterator;
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private:
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RootSet treeRoots;
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public:
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/*ctor*/ InstrForest (Function *F);
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/*dtor*/ ~InstrForest ();
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inline InstructionNode *getTreeNodeForInstr(Instruction* instr) {
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return (*this)[instr];
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}
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const_root_iterator roots_begin() const { return treeRoots.begin(); }
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root_iterator roots_begin() { return treeRoots.begin(); }
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const_root_iterator roots_end () const { return treeRoots.end(); }
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root_iterator roots_end () { return treeRoots.end(); }
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void dump() const;
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private:
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//
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// Private methods for buidling the instruction forest
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//
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void eraseRoot (InstructionNode* node);
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void setLeftChild (InstrTreeNode* parent, InstrTreeNode* child);
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void setRightChild(InstrTreeNode* parent, InstrTreeNode* child);
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void setParent (InstrTreeNode* child, InstrTreeNode* parent);
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void noteTreeNodeForInstr(Instruction* instr, InstructionNode* treeNode);
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InstructionNode* buildTreeForInstruction(Instruction* instr);
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};
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} // End llvm namespace
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#endif
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