mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-22 07:32:48 +00:00
e81561909d
now cerr, cout, and NullStream resp. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32298 91177308-0d34-0410-b5e6-96231b3b80d8
286 lines
11 KiB
C++
286 lines
11 KiB
C++
//===-- 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 "llvm/ADT/SmallVector.h"
|
|
#include "llvm/Support/Streams.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 OStream& operator<<(OStream& os, const LiveRange &LR) {
|
|
if (os.stream()) *os.stream() << LR;
|
|
return os;
|
|
}
|
|
|
|
inline bool operator<(unsigned V, const LiveRange &LR) {
|
|
return V < LR.start;
|
|
}
|
|
|
|
inline bool operator<(const LiveRange &LR, unsigned V) {
|
|
return LR.start < V;
|
|
}
|
|
|
|
/// 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 SmallVector<LiveRange,4> Ranges;
|
|
unsigned reg; // the register of this interval
|
|
float weight; // weight of this interval
|
|
Ranges ranges; // the ranges in which this register is live
|
|
private:
|
|
/// ValueNumberInfo - If this value number is not defined by a copy, this
|
|
/// holds ~0,x. If the value number is not in use, it contains ~1,x to
|
|
/// indicate that the value # is not used. If the val# is defined by a
|
|
/// copy, the first entry is the instruction # of the copy, and the second
|
|
/// is the register number copied from.
|
|
SmallVector<std::pair<unsigned,unsigned>, 4> ValueNumberInfo;
|
|
public:
|
|
|
|
LiveInterval(unsigned Reg, float Weight)
|
|
: reg(Reg), weight(Weight) {
|
|
}
|
|
|
|
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);
|
|
std::swap(ranges, other.ranges);
|
|
std::swap(ValueNumberInfo, other.ValueNumberInfo);
|
|
}
|
|
|
|
bool containsOneValue() const { return ValueNumberInfo.size() == 1; }
|
|
|
|
unsigned getNumValNums() const { return ValueNumberInfo.size(); }
|
|
|
|
/// getNextValue - Create a new value number and return it. MIIdx specifies
|
|
/// the instruction that defines the value number.
|
|
unsigned getNextValue(unsigned MIIdx, unsigned SrcReg) {
|
|
ValueNumberInfo.push_back(std::make_pair(MIIdx, SrcReg));
|
|
return ValueNumberInfo.size()-1;
|
|
}
|
|
|
|
/// getInstForValNum - Return the machine instruction index that defines the
|
|
/// specified value number.
|
|
unsigned getInstForValNum(unsigned ValNo) const {
|
|
//assert(ValNo < ValueNumberInfo.size());
|
|
return ValueNumberInfo[ValNo].first;
|
|
}
|
|
|
|
unsigned getSrcRegForValNum(unsigned ValNo) const {
|
|
//assert(ValNo < ValueNumberInfo.size());
|
|
if (ValueNumberInfo[ValNo].first < ~2U)
|
|
return ValueNumberInfo[ValNo].second;
|
|
return 0;
|
|
}
|
|
|
|
std::pair<unsigned, unsigned> getValNumInfo(unsigned ValNo) const {
|
|
//assert(ValNo < ValueNumberInfo.size());
|
|
return ValueNumberInfo[ValNo];
|
|
}
|
|
|
|
/// setValueNumberInfo - Change the value number info for the specified
|
|
/// value number.
|
|
void setValueNumberInfo(unsigned ValNo,
|
|
const std::pair<unsigned, unsigned> &I){
|
|
ValueNumberInfo[ValNo] = I;
|
|
}
|
|
|
|
/// MergeValueNumberInto - This method is called when two value nubmers
|
|
/// are found to be equivalent. This eliminates V1, replacing all
|
|
/// LiveRanges with the V1 value number with the V2 value number. This can
|
|
/// cause merging of V1/V2 values numbers and compaction of the value space.
|
|
void MergeValueNumberInto(unsigned V1, unsigned V2);
|
|
|
|
/// MergeInClobberRanges - For any live ranges that are not defined in the
|
|
/// current interval, but are defined in the Clobbers interval, mark them
|
|
/// used with an unknown definition value.
|
|
void MergeInClobberRanges(const LiveInterval &Clobbers);
|
|
|
|
|
|
/// MergeRangesInAsValue - Merge all of the intervals in RHS into this live
|
|
/// interval as the specified value number. The LiveRanges in RHS are
|
|
/// allowed to overlap with LiveRanges in the current interval, but only if
|
|
/// the overlapping LiveRanges have the specified value number.
|
|
void MergeRangesInAsValue(const LiveInterval &RHS, unsigned LHSValNo);
|
|
|
|
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 {
|
|
const_iterator I = FindLiveRangeContaining(Idx);
|
|
return I == end() ? 0 : &*I;
|
|
}
|
|
|
|
/// FindLiveRangeContaining - Return an iterator to the live range that
|
|
/// contains the specified index, or end() if there is none.
|
|
const_iterator FindLiveRangeContaining(unsigned Idx) const;
|
|
|
|
/// FindLiveRangeContaining - Return an iterator to the live range that
|
|
/// contains the specified index, or end() if there is none.
|
|
iterator FindLiveRangeContaining(unsigned Idx);
|
|
|
|
/// getOverlapingRanges - Given another live interval which is defined as a
|
|
/// copy from this one, return a list of all of the live ranges where the
|
|
/// two overlap and have different value numbers.
|
|
void getOverlapingRanges(const LiveInterval &Other, unsigned CopyIdx,
|
|
std::vector<LiveRange*> &Ranges);
|
|
|
|
/// 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 applies
|
|
/// mappings to the value numbers in the LHS/RHS intervals as specified. If
|
|
/// the intervals are not joinable, this aborts.
|
|
void join(LiveInterval &Other, int *ValNoAssignments,
|
|
int *RHSValNoAssignments,
|
|
SmallVector<std::pair<unsigned,unsigned>,16> &NewValueNumberInfo);
|
|
|
|
/// 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);
|
|
|
|
void removeRange(LiveRange LR) {
|
|
removeRange(LR.start, LR.end);
|
|
}
|
|
|
|
bool operator<(const LiveInterval& other) const {
|
|
return beginNumber() < other.beginNumber();
|
|
}
|
|
|
|
void print(OStream OS, const MRegisterInfo *MRI = 0) const;
|
|
void print(std::ostream &OS, const MRegisterInfo *MRI = 0) const {
|
|
print(OStream(OS), MRI);
|
|
}
|
|
void dump() const;
|
|
|
|
private:
|
|
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 OStream &operator<<(OStream &OS, const LiveInterval &LI) {
|
|
LI.print(OS);
|
|
return OS;
|
|
}
|
|
|
|
inline std::ostream &operator<<(std::ostream &OS, const LiveInterval &LI) {
|
|
LI.print(OS);
|
|
return OS;
|
|
}
|
|
}
|
|
|
|
#endif
|