#define LLVM_CODEGEN_LIVEINTERVAL_H
#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/Streams.h"
#include <iosfwd>
#include <vector>
#include <cassert>
}
void dump() const;
+ void print(std::ostream &os) const;
+ void print(std::ostream *os) const { if (os) print(*os); }
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;
}
float weight; // weight of this interval
Ranges ranges; // the ranges in which this register is live
private:
- unsigned NumValues; // the number of distinct values in this interval.
-
- /// InstDefiningValue - This tracks the def index of the instruction that
- /// defines a particular value number in the interval. This may be ~0,
- /// which is treated as unknown.
- SmallVector<unsigned, 4> InstDefiningValue;
+ /// 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), NumValues(0) {
+ : reg(Reg), weight(Weight) {
}
typedef Ranges::iterator iterator;
std::swap(reg, other.reg);
std::swap(weight, other.weight);
std::swap(ranges, other.ranges);
- std::swap(NumValues, other.NumValues);
+ std::swap(ValueNumberInfo, other.ValueNumberInfo);
}
- bool containsOneValue() const { return NumValues == 1; }
+ 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) {
- InstDefiningValue.push_back(MIIdx);
- return NumValues++;
+ 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 {
- return InstDefiningValue[ValNo];
+ //assert(ValNo < ValueNumberInfo.size());
+ return ValueNumberInfo[ValNo].first;
}
- /// setInstDefiningValNum - Change the instruction defining the specified
- /// value number to the specified instruction.
- void setInstDefiningValNum(unsigned ValNo, unsigned MIIdx) {
- InstDefiningValue[ValNo] = MIIdx;
+ 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.
/// getLiveRangeContaining - Return the live range that contains the
/// specified index, or null if there is none.
- const LiveRange *getLiveRangeContaining(unsigned Idx) const;
-
+ const LiveRange *getLiveRangeContaining(unsigned Idx) const {
+ const_iterator I = FindLiveRangeContaining(Idx);
+ return I == end() ? 0 : &*I;
+ }
- /// 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;
+ /// 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.
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);
-
+ /// 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(std::ostream &OS, const MRegisterInfo *MRI = 0) const;
+ void print(std::ostream *OS, const MRegisterInfo *MRI = 0) const {
+ if (OS) print(*OS, MRI);
+ }
void dump() const;
private:
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