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Completely eliminate the intervals_ list. instead, the r2iMap_ maintains

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ownership of the intervals.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15155 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-07-24 03:32:06 +00:00
parent 7ac2d3146a
commit 4df98e546d
5 changed files with 96 additions and 102 deletions
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50
include/llvm/CodeGen/LiveIntervalAnalysis.h
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@@ -22,7 +22,6 @@
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "LiveInterval.h"
#include <list>
namespace llvm {
@@ -30,17 +29,10 @@ namespace llvm {
class MRegisterInfo;
class VirtRegMap;
class LiveIntervals : public MachineFunctionPass
{
public:
typedef std::list<LiveInterval> Intervals;
private:
class LiveIntervals : public MachineFunctionPass {
MachineFunction* mf_;
const TargetMachine* tm_;
const MRegisterInfo* mri_;
MachineBasicBlock* currentMbb_;
MachineBasicBlock::iterator currentInstr_;
LiveVariables* lv_;
typedef std::map<MachineInstr*, unsigned> Mi2IndexMap;
@@ -49,14 +41,14 @@ namespace llvm {
typedef std::vector<MachineInstr*> Index2MiMap;
Index2MiMap i2miMap_;
typedef std::map<unsigned, Intervals::iterator> Reg2IntervalMap;
Reg2IntervalMap r2iMap_;
/// r2iMap_ - This map OWNS the interval pointed to by the map. When
/// this map is destroyed or when entries are modified, this intervals
/// should be destroyed or modified as well.
std::map<unsigned, LiveInterval*> r2iMap_;
typedef std::map<unsigned, unsigned> Reg2RegMap;
Reg2RegMap r2rMap_;
Intervals intervals_;
public:
struct InstrSlots
{
@@ -88,15 +80,15 @@ namespace llvm {
return getBaseIndex(index) + InstrSlots::STORE;
}
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
virtual void releaseMemory();
typedef std::map<unsigned, LiveInterval*>::const_iterator iterator;
iterator begin() const { return r2iMap_.begin(); }
iterator end() const { return r2iMap_.end(); }
unsigned getNumIntervals() const { return r2iMap_.size(); }
/// runOnMachineFunction - pass entry point
virtual bool runOnMachineFunction(MachineFunction&);
LiveInterval& getInterval(unsigned reg) {
Reg2IntervalMap::iterator I = r2iMap_.find(reg);
assert(I != r2iMap_.end()&& "Interval does not exist for register");
LiveInterval &getInterval(unsigned reg) const {
std::map<unsigned, LiveInterval*>::const_iterator I =
r2iMap_.find(reg);
assert(I != r2iMap_.end() && "Interval does not exist for register");
return *I->second;
}
@@ -116,12 +108,16 @@ namespace llvm {
return i2miMap_[index];
}
Intervals& getIntervals() { return intervals_; }
std::vector<LiveInterval*> addIntervalsForSpills(const LiveInterval& i,
VirtRegMap& vrm,
int slot);
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
virtual void releaseMemory();
/// runOnMachineFunction - pass entry point
virtual bool runOnMachineFunction(MachineFunction&);
private:
/// computeIntervals - compute live intervals
void computeIntervals();
@@ -159,8 +155,14 @@ namespace llvm {
bool overlapsAliases(const LiveInterval *lhs,
const LiveInterval *rhs) const;
LiveInterval *createInterval(unsigned Reg) const;
LiveInterval& getOrCreateInterval(unsigned reg);
LiveInterval &getOrCreateInterval(unsigned reg) {
LiveInterval *&LI = r2iMap_[reg];
if (LI == 0)
LI = createInterval(reg);
return *LI;
}
/// rep - returns the representative of this register
unsigned rep(unsigned reg) {