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Expose the LiveInterval interfaces as public headers.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23400 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-21 04:19:09 +00:00
parent 779a6513fe
commit 3c3fe462f7
6 changed files with 4 additions and 400 deletions
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2
lib/CodeGen/LiveInterval.cpp
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@ -18,7 +18,7 @@
//
//===----------------------------------------------------------------------===//
#include "LiveInterval.h"
#include "llvm/CodeGen/LiveInterval.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Target/MRegisterInfo.h"
#include <algorithm>

197
lib/CodeGen/LiveInterval.h
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@ -1,197 +0,0 @@
//===-- llvm/CodeGen/LiveInterval.h - Interval representation ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the LiveRange and LiveInterval classes. Given some
// numbering of each the machine instructions an interval [i, j) is said to be a
// live interval for register v if there is no instruction with number j' > j
// such that v is live at j' and there is no instruction with number i' < i such
// that v is live at i'. In this implementation intervals can have holes,
// i.e. an interval might look like [1,20), [50,65), [1000,1001). Each
// individual range is represented as an instance of LiveRange, and the whole
// interval is represented as an instance of LiveInterval.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_LIVEINTERVAL_H
#define LLVM_CODEGEN_LIVEINTERVAL_H
#include <iosfwd>
#include <vector>
#include <cassert>
namespace llvm {
class MRegisterInfo;
/// LiveRange structure - This represents a simple register range in the
/// program, with an inclusive start point and an exclusive end point.
/// These ranges are rendered as [start,end).
struct LiveRange {
unsigned start; // Start point of the interval (inclusive)
unsigned end; // End point of the interval (exclusive)
unsigned ValId; // identifier for the value contained in this interval.
LiveRange(unsigned S, unsigned E, unsigned V) : start(S), end(E), ValId(V) {
assert(S < E && "Cannot create empty or backwards range");
}
/// contains - Return true if the index is covered by this range.
///
bool contains(unsigned I) const {
return start <= I && I < end;
}
bool operator<(const LiveRange &LR) const {
return start < LR.start || (start == LR.start && end < LR.end);
}
bool operator==(const LiveRange &LR) const {
return start == LR.start && end == LR.end;
}
void dump() const;
private:
LiveRange(); // DO NOT IMPLEMENT
};
std::ostream& operator<<(std::ostream& os, const LiveRange &LR);
inline bool operator<(unsigned V, const LiveRange &LR) {
return V < LR.start;
}
/// LiveInterval - This class represents some number of live ranges for a
/// register or value. This class also contains a bit of register allocator
/// state.
struct LiveInterval {
typedef std::vector<LiveRange> Ranges;
unsigned reg; // the register of this interval
float weight; // weight of this interval
Ranges ranges; // the ranges in which this register is live
LiveInterval(unsigned Reg, float Weight)
: reg(Reg), weight(Weight), NumValues(0) {
}
typedef Ranges::iterator iterator;
iterator begin() { return ranges.begin(); }
iterator end() { return ranges.end(); }
typedef Ranges::const_iterator const_iterator;
const_iterator begin() const { return ranges.begin(); }
const_iterator end() const { return ranges.end(); }
/// advanceTo - Advance the specified iterator to point to the LiveRange
/// containing the specified position, or end() if the position is past the
/// end of the interval. If no LiveRange contains this position, but the
/// position is in a hole, this method returns an iterator pointing the the
/// LiveRange immediately after the hole.
iterator advanceTo(iterator I, unsigned Pos) {
if (Pos >= endNumber())
return end();
while (I->end <= Pos) ++I;
return I;
}
void swap(LiveInterval& other) {
std::swap(reg, other.reg);
std::swap(weight, other.weight);
ranges.swap(other.ranges);
std::swap(NumValues, other.NumValues);
}
bool containsOneValue() const { return NumValues == 1; }
unsigned getNextValue() {
return NumValues++;
}
bool empty() const { return ranges.empty(); }
/// beginNumber - Return the lowest numbered slot covered by interval.
unsigned beginNumber() const {
assert(!empty() && "empty interval for register");
return ranges.front().start;
}
/// endNumber - return the maximum point of the interval of the whole,
/// exclusive.
unsigned endNumber() const {
assert(!empty() && "empty interval for register");
return ranges.back().end;
}
bool expiredAt(unsigned index) const {
return index >= endNumber();
}
bool liveAt(unsigned index) const;
/// getLiveRangeContaining - Return the live range that contains the
/// specified index, or null if there is none.
const LiveRange *getLiveRangeContaining(unsigned Idx) const;
/// joinable - Two intervals are joinable if the either don't overlap at all
/// or if the destination of the copy is a single assignment value, and it
/// only overlaps with one value in the source interval.
bool joinable(const LiveInterval& other, unsigned CopyIdx) const;
/// overlaps - Return true if the intersection of the two live intervals is
/// not empty.
bool overlaps(const LiveInterval& other) const {
return overlapsFrom(other, other.begin());
}
/// overlapsFrom - Return true if the intersection of the two live intervals
/// is not empty. The specified iterator is a hint that we can begin
/// scanning the Other interval starting at I.
bool overlapsFrom(const LiveInterval& other, const_iterator I) const;
/// addRange - Add the specified LiveRange to this interval, merging
/// intervals as appropriate. This returns an iterator to the inserted live
/// range (which may have grown since it was inserted.
void addRange(LiveRange LR) {
addRangeFrom(LR, ranges.begin());
}
/// join - Join two live intervals (this, and other) together. This
/// operation is the result of a copy instruction in the source program,
/// that occurs at index 'CopyIdx' that copies from 'other' to 'this'. This
/// destroys 'other'.
void join(LiveInterval& other, unsigned CopyIdx);
/// removeRange - Remove the specified range from this interval. Note that
/// the range must already be in this interval in its entirety.
void removeRange(unsigned Start, unsigned End);
bool operator<(const LiveInterval& other) const {
return beginNumber() < other.beginNumber();
}
void print(std::ostream &OS, const MRegisterInfo *MRI = 0) const;
void dump() const;
private:
unsigned NumValues; // the number of distinct values in this interval.
Ranges::iterator addRangeFrom(LiveRange LR, Ranges::iterator From);
void extendIntervalEndTo(Ranges::iterator I, unsigned NewEnd);
Ranges::iterator extendIntervalStartTo(Ranges::iterator I, unsigned NewStr);
LiveInterval& operator=(const LiveInterval& rhs); // DO NOT IMPLEMENT
};
inline std::ostream &operator<<(std::ostream &OS, const LiveInterval &LI) {
LI.print(OS);
return OS;
}
}
#endif

2
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -16,7 +16,7 @@
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "liveintervals"
#include "LiveIntervalAnalysis.h"
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
#include "VirtRegMap.h"
#include "llvm/Value.h"
#include "llvm/Analysis/LoopInfo.h"

199
lib/CodeGen/LiveIntervalAnalysis.h
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@ -1,199 +0,0 @@
//===-- LiveIntervalAnalysis.h - Live Interval Analysis ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the LiveInterval analysis pass. Given some numbering of
// each the machine instructions (in this implemention depth-first order) an
// interval [i, j) is said to be a live interval for register v if there is no
// instruction with number j' > j such that v is live at j' abd there is no
// instruction with number i' < i such that v is live at i'. In this
// implementation intervals can have holes, i.e. an interval might look like
// [1,20), [50,65), [1000,1001).
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_LIVEINTERVAL_ANALYSIS_H
#define LLVM_CODEGEN_LIVEINTERVAL_ANALYSIS_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "LiveInterval.h"
namespace llvm {
class LiveVariables;
class MRegisterInfo;
class TargetInstrInfo;
class VirtRegMap;
class LiveIntervals : public MachineFunctionPass {
MachineFunction* mf_;
const TargetMachine* tm_;
const MRegisterInfo* mri_;
const TargetInstrInfo* tii_;
LiveVariables* lv_;
typedef std::map<MachineInstr*, unsigned> Mi2IndexMap;
Mi2IndexMap mi2iMap_;
typedef std::vector<MachineInstr*> Index2MiMap;
Index2MiMap i2miMap_;
typedef std::map<unsigned, LiveInterval> Reg2IntervalMap;
Reg2IntervalMap r2iMap_;
typedef DenseMap<unsigned> Reg2RegMap;
Reg2RegMap r2rMap_;
std::vector<bool> allocatableRegs_;
public:
struct InstrSlots
{
enum {
LOAD = 0,
USE = 1,
DEF = 2,
STORE = 3,
NUM = 4,
};
};
static unsigned getBaseIndex(unsigned index) {
return index - (index % InstrSlots::NUM);
}
static unsigned getBoundaryIndex(unsigned index) {
return getBaseIndex(index + InstrSlots::NUM - 1);
}
static unsigned getLoadIndex(unsigned index) {
return getBaseIndex(index) + InstrSlots::LOAD;
}
static unsigned getUseIndex(unsigned index) {
return getBaseIndex(index) + InstrSlots::USE;
}
static unsigned getDefIndex(unsigned index) {
return getBaseIndex(index) + InstrSlots::DEF;
}
static unsigned getStoreIndex(unsigned index) {
return getBaseIndex(index) + InstrSlots::STORE;
}
typedef Reg2IntervalMap::iterator iterator;
typedef Reg2IntervalMap::const_iterator const_iterator;
const_iterator begin() const { return r2iMap_.begin(); }
const_iterator end() const { return r2iMap_.end(); }
iterator begin() { return r2iMap_.begin(); }
iterator end() { return r2iMap_.end(); }
unsigned getNumIntervals() const { return r2iMap_.size(); }
LiveInterval &getInterval(unsigned reg) {
Reg2IntervalMap::iterator I = r2iMap_.find(reg);
assert(I != r2iMap_.end() && "Interval does not exist for register");
return I->second;
}
const LiveInterval &getInterval(unsigned reg) const {
Reg2IntervalMap::const_iterator I = r2iMap_.find(reg);
assert(I != r2iMap_.end() && "Interval does not exist for register");
return I->second;
}
/// getInstructionIndex - returns the base index of instr
unsigned getInstructionIndex(MachineInstr* instr) const {
Mi2IndexMap::const_iterator it = mi2iMap_.find(instr);
assert(it != mi2iMap_.end() && "Invalid instruction!");
return it->second;
}
/// getInstructionFromIndex - given an index in any slot of an
/// instruction return a pointer the instruction
MachineInstr* getInstructionFromIndex(unsigned index) const {
index /= InstrSlots::NUM; // convert index to vector index
assert(index < i2miMap_.size() &&
"index does not correspond to an instruction");
return i2miMap_[index];
}
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&);
/// print - Implement the dump method.
virtual void print(std::ostream &O, const Module* = 0) const;
private:
/// computeIntervals - compute live intervals
void computeIntervals();
/// joinIntervals - join compatible live intervals
void joinIntervals();
/// joinIntervalsInMachineBB - Join intervals based on move
/// instructions in the specified basic block.
void joinIntervalsInMachineBB(MachineBasicBlock *MBB);
/// handleRegisterDef - update intervals for a register def
/// (calls handlePhysicalRegisterDef and
/// handleVirtualRegisterDef)
void handleRegisterDef(MachineBasicBlock* mbb,
MachineBasicBlock::iterator mi,
unsigned reg);
/// handleVirtualRegisterDef - update intervals for a virtual
/// register def
void handleVirtualRegisterDef(MachineBasicBlock* mbb,
MachineBasicBlock::iterator mi,
LiveInterval& interval);
/// handlePhysicalRegisterDef - update intervals for a physical register
/// def. If the defining instruction is a move instruction, SrcReg will be
/// the input register, and DestReg will be the result. Note that Interval
/// may not match DestReg (it might be an alias instead).
///
void handlePhysicalRegisterDef(MachineBasicBlock* mbb,
MachineBasicBlock::iterator mi,
LiveInterval& interval,
unsigned SrcReg, unsigned DestReg,
bool isLiveIn = false);
/// Return true if the two specified registers belong to different
/// register classes. The registers may be either phys or virt regs.
bool differingRegisterClasses(unsigned RegA, unsigned RegB) const;
bool overlapsAliases(const LiveInterval *lhs,
const LiveInterval *rhs) const;
static LiveInterval createInterval(unsigned Reg);
LiveInterval &getOrCreateInterval(unsigned reg) {
Reg2IntervalMap::iterator I = r2iMap_.find(reg);
if (I == r2iMap_.end())
I = r2iMap_.insert(I, std::make_pair(reg, createInterval(reg)));
return I->second;
}
/// rep - returns the representative of this register
unsigned rep(unsigned Reg) {
unsigned Rep = r2rMap_[Reg];
if (Rep)
return r2rMap_[Reg] = rep(Rep);
return Reg;
}
void printRegName(unsigned reg) const;
};
} // End llvm namespace
#endif

2
lib/CodeGen/RegAllocIterativeScan.cpp
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@ -28,7 +28,7 @@
#include "llvm/Support/Debug.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/STLExtras.h"
#include "LiveIntervalAnalysis.h"
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
#include "PhysRegTracker.h"
#include "VirtRegMap.h"
#include <algorithm>

2
lib/CodeGen/RegAllocLinearScan.cpp
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@ -12,7 +12,7 @@
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "regalloc"
#include "LiveIntervalAnalysis.h"
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
#include "PhysRegTracker.h"
#include "VirtRegMap.h"
#include "llvm/Function.h"