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c781a243a3
VirtRegMap keeps track of allocations so it knows what's not used. As a horrible hack, the stack coloring can color spill slots with *free* registers. That is, it replace reload and spills with copies from and to the free register. It unfold instructions that load and store the spill slot and replace them with register using variants. Not yet enabled. This is part 1. More coming. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70787 91177308-0d34-0410-b5e6-96231b3b80d8
535 lines
22 KiB
C++
535 lines
22 KiB
C++
//===-- LiveIntervalAnalysis.h - Live Interval Analysis ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the LiveInterval analysis pass. Given some numbering of
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// each the machine instructions (in this implemention depth-first order) an
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// interval [i, j) is said to be a live interval for register v if there is no
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// instruction with number j' > j such that v is live at j' and there is no
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// instruction with number i' < i such that v is live at i'. In this
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// implementation intervals can have holes, i.e. an interval might look like
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// [1,20), [50,65), [1000,1001).
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_LIVEINTERVAL_ANALYSIS_H
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#define LLVM_CODEGEN_LIVEINTERVAL_ANALYSIS_H
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/LiveInterval.h"
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#include "llvm/ADT/BitVector.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/Allocator.h"
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#include <cmath>
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namespace llvm {
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class AliasAnalysis;
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class LiveVariables;
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class MachineLoopInfo;
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class TargetRegisterInfo;
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class MachineRegisterInfo;
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class TargetInstrInfo;
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class TargetRegisterClass;
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class VirtRegMap;
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typedef std::pair<unsigned, MachineBasicBlock*> IdxMBBPair;
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inline bool operator<(unsigned V, const IdxMBBPair &IM) {
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return V < IM.first;
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}
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inline bool operator<(const IdxMBBPair &IM, unsigned V) {
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return IM.first < V;
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}
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struct Idx2MBBCompare {
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bool operator()(const IdxMBBPair &LHS, const IdxMBBPair &RHS) const {
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return LHS.first < RHS.first;
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}
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};
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class LiveIntervals : public MachineFunctionPass {
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MachineFunction* mf_;
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MachineRegisterInfo* mri_;
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const TargetMachine* tm_;
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const TargetRegisterInfo* tri_;
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const TargetInstrInfo* tii_;
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AliasAnalysis *aa_;
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LiveVariables* lv_;
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/// Special pool allocator for VNInfo's (LiveInterval val#).
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///
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BumpPtrAllocator VNInfoAllocator;
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/// MBB2IdxMap - The indexes of the first and last instructions in the
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/// specified basic block.
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std::vector<std::pair<unsigned, unsigned> > MBB2IdxMap;
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/// Idx2MBBMap - Sorted list of pairs of index of first instruction
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/// and MBB id.
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std::vector<IdxMBBPair> Idx2MBBMap;
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/// FunctionSize - The number of instructions present in the function
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uint64_t FunctionSize;
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typedef DenseMap<MachineInstr*, unsigned> Mi2IndexMap;
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Mi2IndexMap mi2iMap_;
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typedef std::vector<MachineInstr*> Index2MiMap;
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Index2MiMap i2miMap_;
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typedef DenseMap<unsigned, LiveInterval*> Reg2IntervalMap;
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Reg2IntervalMap r2iMap_;
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BitVector allocatableRegs_;
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std::vector<MachineInstr*> ClonedMIs;
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public:
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static char ID; // Pass identification, replacement for typeid
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LiveIntervals() : MachineFunctionPass(&ID) {}
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struct InstrSlots {
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enum {
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LOAD = 0,
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USE = 1,
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DEF = 2,
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STORE = 3,
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NUM = 4
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};
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};
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static unsigned getBaseIndex(unsigned index) {
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return index - (index % InstrSlots::NUM);
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}
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static unsigned getBoundaryIndex(unsigned index) {
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return getBaseIndex(index + InstrSlots::NUM - 1);
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}
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static unsigned getLoadIndex(unsigned index) {
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return getBaseIndex(index) + InstrSlots::LOAD;
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}
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static unsigned getUseIndex(unsigned index) {
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return getBaseIndex(index) + InstrSlots::USE;
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}
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static unsigned getDefIndex(unsigned index) {
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return getBaseIndex(index) + InstrSlots::DEF;
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}
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static unsigned getStoreIndex(unsigned index) {
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return getBaseIndex(index) + InstrSlots::STORE;
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}
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static float getSpillWeight(bool isDef, bool isUse, unsigned loopDepth) {
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return (isDef + isUse) * powf(10.0F, (float)loopDepth);
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}
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typedef Reg2IntervalMap::iterator iterator;
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typedef Reg2IntervalMap::const_iterator const_iterator;
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const_iterator begin() const { return r2iMap_.begin(); }
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const_iterator end() const { return r2iMap_.end(); }
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iterator begin() { return r2iMap_.begin(); }
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iterator end() { return r2iMap_.end(); }
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unsigned getNumIntervals() const { return (unsigned)r2iMap_.size(); }
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LiveInterval &getInterval(unsigned reg) {
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Reg2IntervalMap::iterator I = r2iMap_.find(reg);
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assert(I != r2iMap_.end() && "Interval does not exist for register");
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return *I->second;
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}
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const LiveInterval &getInterval(unsigned reg) const {
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Reg2IntervalMap::const_iterator I = r2iMap_.find(reg);
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assert(I != r2iMap_.end() && "Interval does not exist for register");
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return *I->second;
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}
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bool hasInterval(unsigned reg) const {
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return r2iMap_.count(reg);
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}
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/// getMBBStartIdx - Return the base index of the first instruction in the
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/// specified MachineBasicBlock.
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unsigned getMBBStartIdx(MachineBasicBlock *MBB) const {
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return getMBBStartIdx(MBB->getNumber());
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}
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unsigned getMBBStartIdx(unsigned MBBNo) const {
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assert(MBBNo < MBB2IdxMap.size() && "Invalid MBB number!");
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return MBB2IdxMap[MBBNo].first;
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}
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/// getMBBEndIdx - Return the store index of the last instruction in the
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/// specified MachineBasicBlock.
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unsigned getMBBEndIdx(MachineBasicBlock *MBB) const {
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return getMBBEndIdx(MBB->getNumber());
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}
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unsigned getMBBEndIdx(unsigned MBBNo) const {
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assert(MBBNo < MBB2IdxMap.size() && "Invalid MBB number!");
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return MBB2IdxMap[MBBNo].second;
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}
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/// getScaledIntervalSize - get the size of an interval in "units,"
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/// where every function is composed of one thousand units. This
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/// measure scales properly with empty index slots in the function.
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double getScaledIntervalSize(LiveInterval& I) {
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return (1000.0 / InstrSlots::NUM * I.getSize()) / i2miMap_.size();
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}
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/// getApproximateInstructionCount - computes an estimate of the number
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/// of instructions in a given LiveInterval.
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unsigned getApproximateInstructionCount(LiveInterval& I) {
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double IntervalPercentage = getScaledIntervalSize(I) / 1000.0;
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return (unsigned)(IntervalPercentage * FunctionSize);
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}
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/// getMBBFromIndex - given an index in any instruction of an
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/// MBB return a pointer the MBB
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MachineBasicBlock* getMBBFromIndex(unsigned index) const {
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std::vector<IdxMBBPair>::const_iterator I =
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std::lower_bound(Idx2MBBMap.begin(), Idx2MBBMap.end(), index);
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// Take the pair containing the index
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std::vector<IdxMBBPair>::const_iterator J =
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((I != Idx2MBBMap.end() && I->first > index) ||
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(I == Idx2MBBMap.end() && Idx2MBBMap.size()>0)) ? (I-1): I;
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assert(J != Idx2MBBMap.end() && J->first < index+1 &&
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index <= getMBBEndIdx(J->second) &&
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"index does not correspond to an MBB");
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return J->second;
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}
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/// getInstructionIndex - returns the base index of instr
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unsigned getInstructionIndex(MachineInstr* instr) const {
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Mi2IndexMap::const_iterator it = mi2iMap_.find(instr);
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assert(it != mi2iMap_.end() && "Invalid instruction!");
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return it->second;
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}
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/// getInstructionFromIndex - given an index in any slot of an
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/// instruction return a pointer the instruction
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MachineInstr* getInstructionFromIndex(unsigned index) const {
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index /= InstrSlots::NUM; // convert index to vector index
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assert(index < i2miMap_.size() &&
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"index does not correspond to an instruction");
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return i2miMap_[index];
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}
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/// hasGapBeforeInstr - Return true if the previous instruction slot,
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/// i.e. Index - InstrSlots::NUM, is not occupied.
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bool hasGapBeforeInstr(unsigned Index) {
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Index = getBaseIndex(Index - InstrSlots::NUM);
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return getInstructionFromIndex(Index) == 0;
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}
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/// findGapBeforeInstr - Find an empty instruction slot before the
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/// specified index. If "Furthest" is true, find one that's furthest
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/// away from the index (but before any index that's occupied).
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unsigned findGapBeforeInstr(unsigned Index, bool Furthest = false) {
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Index = getBaseIndex(Index - InstrSlots::NUM);
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if (getInstructionFromIndex(Index))
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return 0; // No gap!
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if (!Furthest)
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return Index;
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unsigned PrevIndex = getBaseIndex(Index - InstrSlots::NUM);
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while (getInstructionFromIndex(Index)) {
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Index = PrevIndex;
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PrevIndex = getBaseIndex(Index - InstrSlots::NUM);
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}
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return Index;
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}
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/// InsertMachineInstrInMaps - Insert the specified machine instruction
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/// into the instruction index map at the given index.
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void InsertMachineInstrInMaps(MachineInstr *MI, unsigned Index) {
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i2miMap_[Index / InstrSlots::NUM] = MI;
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Mi2IndexMap::iterator it = mi2iMap_.find(MI);
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assert(it == mi2iMap_.end() && "Already in map!");
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mi2iMap_[MI] = Index;
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}
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/// conflictsWithPhysRegDef - Returns true if the specified register
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/// is defined during the duration of the specified interval.
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bool conflictsWithPhysRegDef(const LiveInterval &li, VirtRegMap &vrm,
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unsigned reg);
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/// conflictsWithPhysRegRef - Similar to conflictsWithPhysRegRef except
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/// it can check use as well.
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bool conflictsWithPhysRegRef(LiveInterval &li, unsigned Reg,
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bool CheckUse,
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SmallPtrSet<MachineInstr*,32> &JoinedCopies);
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/// findLiveInMBBs - Given a live range, if the value of the range
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/// is live in any MBB returns true as well as the list of basic blocks
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/// in which the value is live.
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bool findLiveInMBBs(unsigned Start, unsigned End,
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SmallVectorImpl<MachineBasicBlock*> &MBBs) const;
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/// findReachableMBBs - Return a list MBB that can be reached via any
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/// branch or fallthroughs. Return true if the list is not empty.
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bool findReachableMBBs(unsigned Start, unsigned End,
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SmallVectorImpl<MachineBasicBlock*> &MBBs) const;
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// Interval creation
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LiveInterval &getOrCreateInterval(unsigned reg) {
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Reg2IntervalMap::iterator I = r2iMap_.find(reg);
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if (I == r2iMap_.end())
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I = r2iMap_.insert(std::make_pair(reg, createInterval(reg))).first;
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return *I->second;
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}
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/// dupInterval - Duplicate a live interval. The caller is responsible for
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/// managing the allocated memory.
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LiveInterval *dupInterval(LiveInterval *li);
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/// addLiveRangeToEndOfBlock - Given a register and an instruction,
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/// adds a live range from that instruction to the end of its MBB.
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LiveRange addLiveRangeToEndOfBlock(unsigned reg,
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MachineInstr* startInst);
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// Interval removal
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void removeInterval(unsigned Reg) {
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DenseMap<unsigned, LiveInterval*>::iterator I = r2iMap_.find(Reg);
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delete I->second;
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r2iMap_.erase(I);
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}
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/// isNotInMIMap - returns true if the specified machine instr has been
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/// removed or was never entered in the map.
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bool isNotInMIMap(MachineInstr* instr) const {
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return !mi2iMap_.count(instr);
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}
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/// RemoveMachineInstrFromMaps - This marks the specified machine instr as
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/// deleted.
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void RemoveMachineInstrFromMaps(MachineInstr *MI) {
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// remove index -> MachineInstr and
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// MachineInstr -> index mappings
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Mi2IndexMap::iterator mi2i = mi2iMap_.find(MI);
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if (mi2i != mi2iMap_.end()) {
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i2miMap_[mi2i->second/InstrSlots::NUM] = 0;
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mi2iMap_.erase(mi2i);
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}
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}
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/// ReplaceMachineInstrInMaps - Replacing a machine instr with a new one in
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/// maps used by register allocator.
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void ReplaceMachineInstrInMaps(MachineInstr *MI, MachineInstr *NewMI) {
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Mi2IndexMap::iterator mi2i = mi2iMap_.find(MI);
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if (mi2i == mi2iMap_.end())
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return;
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i2miMap_[mi2i->second/InstrSlots::NUM] = NewMI;
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Mi2IndexMap::iterator it = mi2iMap_.find(MI);
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assert(it != mi2iMap_.end() && "Invalid instruction!");
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unsigned Index = it->second;
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mi2iMap_.erase(it);
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mi2iMap_[NewMI] = Index;
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}
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BumpPtrAllocator& getVNInfoAllocator() { return VNInfoAllocator; }
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/// getVNInfoSourceReg - Helper function that parses the specified VNInfo
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/// copy field and returns the source register that defines it.
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unsigned getVNInfoSourceReg(const VNInfo *VNI) const;
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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virtual void releaseMemory();
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/// runOnMachineFunction - pass entry point
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virtual bool runOnMachineFunction(MachineFunction&);
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/// print - Implement the dump method.
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virtual void print(std::ostream &O, const Module* = 0) const;
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void print(std::ostream *O, const Module* M = 0) const {
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if (O) print(*O, M);
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}
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/// addIntervalsForSpills - Create new intervals for spilled defs / uses of
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/// the given interval. FIXME: It also returns the weight of the spill slot
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/// (if any is created) by reference. This is temporary.
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std::vector<LiveInterval*>
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addIntervalsForSpills(const LiveInterval& i,
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SmallVectorImpl<LiveInterval*> &SpillIs,
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const MachineLoopInfo *loopInfo, VirtRegMap& vrm);
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/// addIntervalsForSpillsFast - Quickly create new intervals for spilled
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/// defs / uses without remat or splitting.
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std::vector<LiveInterval*>
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addIntervalsForSpillsFast(const LiveInterval &li,
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const MachineLoopInfo *loopInfo, VirtRegMap &vrm);
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/// spillPhysRegAroundRegDefsUses - Spill the specified physical register
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/// around all defs and uses of the specified interval. Return true if it
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/// was able to cut its interval.
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bool spillPhysRegAroundRegDefsUses(const LiveInterval &li,
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unsigned PhysReg, VirtRegMap &vrm);
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/// isReMaterializable - Returns true if every definition of MI of every
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/// val# of the specified interval is re-materializable. Also returns true
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/// by reference if all of the defs are load instructions.
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bool isReMaterializable(const LiveInterval &li,
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SmallVectorImpl<LiveInterval*> &SpillIs,
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bool &isLoad);
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/// isReMaterializable - Returns true if the definition MI of the specified
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/// val# of the specified interval is re-materializable.
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bool isReMaterializable(const LiveInterval &li, const VNInfo *ValNo,
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MachineInstr *MI);
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/// getRepresentativeReg - Find the largest super register of the specified
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/// physical register.
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unsigned getRepresentativeReg(unsigned Reg) const;
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/// getNumConflictsWithPhysReg - Return the number of uses and defs of the
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/// specified interval that conflicts with the specified physical register.
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unsigned getNumConflictsWithPhysReg(const LiveInterval &li,
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unsigned PhysReg) const;
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/// computeNumbering - Compute the index numbering.
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void computeNumbering();
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/// intervalIsInOneMBB - Returns true if the specified interval is entirely
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/// within a single basic block.
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bool intervalIsInOneMBB(const LiveInterval &li) const;
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private:
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/// computeIntervals - Compute live intervals.
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void computeIntervals();
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/// handleRegisterDef - update intervals for a register def
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/// (calls handlePhysicalRegisterDef and
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/// handleVirtualRegisterDef)
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void handleRegisterDef(MachineBasicBlock *MBB,
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MachineBasicBlock::iterator MI, unsigned MIIdx,
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MachineOperand& MO, unsigned MOIdx);
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/// handleVirtualRegisterDef - update intervals for a virtual
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/// register def
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void handleVirtualRegisterDef(MachineBasicBlock *MBB,
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MachineBasicBlock::iterator MI,
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unsigned MIIdx, MachineOperand& MO,
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unsigned MOIdx, LiveInterval& interval);
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/// handlePhysicalRegisterDef - update intervals for a physical register
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/// def.
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void handlePhysicalRegisterDef(MachineBasicBlock* mbb,
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MachineBasicBlock::iterator mi,
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unsigned MIIdx, MachineOperand& MO,
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LiveInterval &interval,
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MachineInstr *CopyMI);
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/// handleLiveInRegister - Create interval for a livein register.
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void handleLiveInRegister(MachineBasicBlock* mbb,
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unsigned MIIdx,
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LiveInterval &interval, bool isAlias = false);
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/// getReMatImplicitUse - If the remat definition MI has one (for now, we
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/// only allow one) virtual register operand, then its uses are implicitly
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/// using the register. Returns the virtual register.
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unsigned getReMatImplicitUse(const LiveInterval &li,
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MachineInstr *MI) const;
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/// isValNoAvailableAt - Return true if the val# of the specified interval
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/// which reaches the given instruction also reaches the specified use
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/// index.
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bool isValNoAvailableAt(const LiveInterval &li, MachineInstr *MI,
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unsigned UseIdx) const;
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/// isReMaterializable - Returns true if the definition MI of the specified
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/// val# of the specified interval is re-materializable. Also returns true
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/// by reference if the def is a load.
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bool isReMaterializable(const LiveInterval &li, const VNInfo *ValNo,
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MachineInstr *MI,
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SmallVectorImpl<LiveInterval*> &SpillIs,
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bool &isLoad);
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/// tryFoldMemoryOperand - Attempts to fold either a spill / restore from
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/// slot / to reg or any rematerialized load into ith operand of specified
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/// MI. If it is successul, MI is updated with the newly created MI and
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/// returns true.
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bool tryFoldMemoryOperand(MachineInstr* &MI, VirtRegMap &vrm,
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MachineInstr *DefMI, unsigned InstrIdx,
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SmallVector<unsigned, 2> &Ops,
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bool isSS, int Slot, unsigned Reg);
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/// canFoldMemoryOperand - Return true if the specified load / store
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/// folding is possible.
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bool canFoldMemoryOperand(MachineInstr *MI,
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SmallVector<unsigned, 2> &Ops,
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bool ReMatLoadSS) const;
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/// anyKillInMBBAfterIdx - Returns true if there is a kill of the specified
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/// VNInfo that's after the specified index but is within the basic block.
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bool anyKillInMBBAfterIdx(const LiveInterval &li, const VNInfo *VNI,
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MachineBasicBlock *MBB, unsigned Idx) const;
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/// hasAllocatableSuperReg - Return true if the specified physical register
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/// has any super register that's allocatable.
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bool hasAllocatableSuperReg(unsigned Reg) const;
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/// SRInfo - Spill / restore info.
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struct SRInfo {
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int index;
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unsigned vreg;
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bool canFold;
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SRInfo(int i, unsigned vr, bool f) : index(i), vreg(vr), canFold(f) {};
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};
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bool alsoFoldARestore(int Id, int index, unsigned vr,
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BitVector &RestoreMBBs,
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|
DenseMap<unsigned,std::vector<SRInfo> >&RestoreIdxes);
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|
void eraseRestoreInfo(int Id, int index, unsigned vr,
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|
BitVector &RestoreMBBs,
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|
DenseMap<unsigned,std::vector<SRInfo> >&RestoreIdxes);
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|
|
|
/// handleSpilledImpDefs - Remove IMPLICIT_DEF instructions which are being
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/// spilled and create empty intervals for their uses.
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|
void handleSpilledImpDefs(const LiveInterval &li, VirtRegMap &vrm,
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|
const TargetRegisterClass* rc,
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|
std::vector<LiveInterval*> &NewLIs);
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|
|
|
/// rewriteImplicitOps - Rewrite implicit use operands of MI (i.e. uses of
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|
/// interval on to-be re-materialized operands of MI) with new register.
|
|
void rewriteImplicitOps(const LiveInterval &li,
|
|
MachineInstr *MI, unsigned NewVReg, VirtRegMap &vrm);
|
|
|
|
/// rewriteInstructionForSpills, rewriteInstructionsForSpills - Helper
|
|
/// functions for addIntervalsForSpills to rewrite uses / defs for the given
|
|
/// live range.
|
|
bool rewriteInstructionForSpills(const LiveInterval &li, const VNInfo *VNI,
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|
bool TrySplit, unsigned index, unsigned end, MachineInstr *MI,
|
|
MachineInstr *OrigDefMI, MachineInstr *DefMI, unsigned Slot, int LdSlot,
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|
bool isLoad, bool isLoadSS, bool DefIsReMat, bool CanDelete,
|
|
VirtRegMap &vrm, const TargetRegisterClass* rc,
|
|
SmallVector<int, 4> &ReMatIds, const MachineLoopInfo *loopInfo,
|
|
unsigned &NewVReg, unsigned ImpUse, bool &HasDef, bool &HasUse,
|
|
DenseMap<unsigned,unsigned> &MBBVRegsMap,
|
|
std::vector<LiveInterval*> &NewLIs);
|
|
void rewriteInstructionsForSpills(const LiveInterval &li, bool TrySplit,
|
|
LiveInterval::Ranges::const_iterator &I,
|
|
MachineInstr *OrigDefMI, MachineInstr *DefMI, unsigned Slot, int LdSlot,
|
|
bool isLoad, bool isLoadSS, bool DefIsReMat, bool CanDelete,
|
|
VirtRegMap &vrm, const TargetRegisterClass* rc,
|
|
SmallVector<int, 4> &ReMatIds, const MachineLoopInfo *loopInfo,
|
|
BitVector &SpillMBBs,
|
|
DenseMap<unsigned,std::vector<SRInfo> > &SpillIdxes,
|
|
BitVector &RestoreMBBs,
|
|
DenseMap<unsigned,std::vector<SRInfo> > &RestoreIdxes,
|
|
DenseMap<unsigned,unsigned> &MBBVRegsMap,
|
|
std::vector<LiveInterval*> &NewLIs);
|
|
|
|
static LiveInterval* createInterval(unsigned Reg);
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|
|
|
void printRegName(unsigned reg) const;
|
|
};
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|
|
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} // End llvm namespace
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#endif
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