#define LLVM_CODEGEN_LIVEINTERVAL_H
#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/Streams.h"
#include <iosfwd>
#include <vector>
#include <cassert>
namespace llvm {
+ class MachineInstr;
class MRegisterInfo;
/// LiveRange structure - This represents a simple register range in the
}
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;
}
struct LiveInterval {
typedef SmallVector<LiveRange,4> Ranges;
unsigned reg; // the register of this interval
+ unsigned preference; // preferred register to allocate for this interval
float weight; // weight of this interval
Ranges ranges; // the ranges in which this register is live
+
+ /// ValueNumberInfo - If the value number definition is undefined (e.g. phi
+ /// merge point), it contains ~0u,x. If the value number is not in use, it
+ /// contains ~1u,x to indicate that the value # is not used.
+ struct VNInfo {
+ unsigned def; // instruction # of the definition
+ unsigned reg; // src reg: non-zero iff val# is defined by a copy
+ SmallVector<unsigned, 4> kills; // instruction #s of the kills
+ VNInfo() : def(~1U), reg(0) {};
+ VNInfo(unsigned d, unsigned r) : def(d), reg(r) {};
+ };
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;
+ SmallVector<VNInfo, 4> ValueNumberInfo;
public:
LiveInterval(unsigned Reg, float Weight)
- : reg(Reg), weight(Weight) {
+ : reg(Reg), preference(0), weight(Weight) {
}
typedef Ranges::iterator iterator;
/// 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));
+ ValueNumberInfo.push_back(VNInfo(MIIdx, SrcReg));
return ValueNumberInfo.size()-1;
}
- /// getInstForValNum - Return the machine instruction index that defines the
+ /// getDefForValNum - 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 getDefForValNum(unsigned ValNo) const {
+ assert(ValNo < ValueNumberInfo.size());
+ return ValueNumberInfo[ValNo].def;
}
+ /// getSrcRegForValNum - If the machine instruction that defines the
+ /// specified value number is a copy, returns the source register. Otherwise,
+ /// returns zero.
unsigned getSrcRegForValNum(unsigned ValNo) const {
- //assert(ValNo < ValueNumberInfo.size());
- if (ValueNumberInfo[ValNo].first < ~2U)
- return ValueNumberInfo[ValNo].second;
- return 0;
+ assert(ValNo < ValueNumberInfo.size());
+ return ValueNumberInfo[ValNo].reg;
+ }
+
+ /// setDefForValNum - Set the machine instruction index that defines the
+ /// specified value number.
+ void setDefForValNum(unsigned ValNo, unsigned NewDef) {
+ assert(ValNo < ValueNumberInfo.size());
+ ValueNumberInfo[ValNo].def = NewDef;
}
- std::pair<unsigned, unsigned> getValNumInfo(unsigned ValNo) const {
- //assert(ValNo < ValueNumberInfo.size());
+ /// setSrcRegForValNum - Set the source register of the specified value
+ /// number.
+ void setSrcRegForValNum(unsigned ValNo, unsigned NewReg) {
+ assert(ValNo < ValueNumberInfo.size());
+ ValueNumberInfo[ValNo].reg = NewReg;
+ }
+
+ /// getKillsForValNum - Return the kill instruction indexes of the specified
+ /// value number.
+ const SmallVector<unsigned, 4> &getKillsForValNum(unsigned ValNo) const {
+ assert(ValNo < ValueNumberInfo.size());
+ return ValueNumberInfo[ValNo].kills;
+ }
+
+ /// addKillForValNum - Add a kill instruction index to the specified value
+ /// number.
+ void addKillForValNum(unsigned ValNo, unsigned KillIdx) {
+ assert(ValNo < ValueNumberInfo.size());
+ SmallVector<unsigned, 4> &kills = ValueNumberInfo[ValNo].kills;
+ if (kills.empty()) {
+ kills.push_back(KillIdx);
+ } else {
+ SmallVector<unsigned, 4>::iterator
+ I = std::lower_bound(kills.begin(), kills.end(), KillIdx);
+ kills.insert(I, KillIdx);
+ }
+ }
+
+ /// addKills - Add a number of kills into the VNInfo kill vector. If this
+ /// interval is live at a kill point, then the kill is not added.
+ void addKills(VNInfo &VNI, const SmallVector<unsigned, 4> &kills) {
+ for (unsigned i = 0, e = kills.size(); i != e; ++i) {
+ unsigned KillIdx = kills[i];
+ if (!liveAt(KillIdx)) {
+ SmallVector<unsigned, 4>::iterator
+ I = std::lower_bound(VNI.kills.begin(), VNI.kills.end(), KillIdx);
+ VNI.kills.insert(I, KillIdx);
+ }
+ }
+ }
+
+ /// addKillsForValNum - Add a number of kills into the kills vector of
+ /// the specified value number.
+ void addKillsForValNum(unsigned ValNo,
+ const SmallVector<unsigned, 4> &kills) {
+ addKills(ValueNumberInfo[ValNo], kills);
+ }
+
+ /// isKillForValNum - Returns true if KillIdx is a kill of the specified
+ /// val#.
+ bool isKillForValNum(unsigned ValNo, unsigned KillIdx) const {
+ assert(ValNo < ValueNumberInfo.size());
+ const SmallVector<unsigned, 4> &kills = ValueNumberInfo[ValNo].kills;
+ SmallVector<unsigned, 4>::const_iterator
+ I = std::lower_bound(kills.begin(), kills.end(), KillIdx);
+ if (I == kills.end())
+ return false;
+ return *I == KillIdx;
+ }
+
+ /// removeKill - Remove the specified kill from the list of kills of
+ /// the specified val#.
+ static bool removeKill(VNInfo &VNI, unsigned KillIdx) {
+ SmallVector<unsigned, 4> &kills = VNI.kills;
+ SmallVector<unsigned, 4>::iterator
+ I = std::lower_bound(kills.begin(), kills.end(), KillIdx);
+ if (I != kills.end() && *I == KillIdx) {
+ kills.erase(I);
+ return true;
+ }
+ return false;
+ }
+
+ /// removeKillForValNum - Remove the specified kill from the list of kills
+ /// of the specified val#.
+ bool removeKillForValNum(unsigned ValNo, unsigned KillIdx) {
+ assert(ValNo < ValueNumberInfo.size());
+ return removeKill(ValueNumberInfo[ValNo], KillIdx);
+ }
+
+ /// removeKillForValNum - Remove all the kills in specified range
+ /// [Start, End] of the specified val#.
+ void removeKillForValNum(unsigned ValNo, unsigned Start, unsigned End) {
+ assert(ValNo < ValueNumberInfo.size());
+ SmallVector<unsigned, 4> &kills = ValueNumberInfo[ValNo].kills;
+ SmallVector<unsigned, 4>::iterator
+ I = std::lower_bound(kills.begin(), kills.end(), Start);
+ SmallVector<unsigned, 4>::iterator
+ E = std::upper_bound(kills.begin(), kills.end(), End);
+ kills.erase(I, E);
+ }
+
+ /// replaceKill - Replace a kill index of the specified value# with a new
+ /// kill. Returns true if OldKill was indeed a kill point.
+ static bool replaceKill(VNInfo &VNI, unsigned OldKill, unsigned NewKill) {
+ SmallVector<unsigned, 4> &kills = VNI.kills;
+ SmallVector<unsigned, 4>::iterator
+ I = std::lower_bound(kills.begin(), kills.end(), OldKill);
+ if (I != kills.end() && *I == OldKill) {
+ *I = NewKill;
+ return true;
+ }
+ return false;
+ }
+
+ /// replaceKillForValNum - Replace a kill index of the specified value# with
+ /// a new kill. Returns true if OldKill was indeed a kill point.
+ bool replaceKillForValNum(unsigned ValNo, unsigned OldKill,
+ unsigned NewKill) {
+ assert(ValNo < ValueNumberInfo.size());
+ return replaceKill(ValueNumberInfo[ValNo], OldKill, NewKill);
+ }
+
+ /// getValNumInfo - Returns a copy of the specified val#.
+ ///
+ VNInfo getValNumInfo(unsigned ValNo) const {
+ assert(ValNo < ValueNumberInfo.size());
return ValueNumberInfo[ValNo];
}
- /// setValueNumberInfo - Change the value number info for the specified
+ /// setValNumInfo - Change the value number info for the specified
/// value number.
- void setValueNumberInfo(unsigned ValNo,
- const std::pair<unsigned, unsigned> &I){
+ void setValNumInfo(unsigned ValNo, const VNInfo &I) {
ValueNumberInfo[ValNo] = I;
}
-
+
+ /// copyValNumInfo - Copy the value number info for one value number to
+ /// another.
+ void copyValNumInfo(unsigned DstValNo, unsigned SrcValNo) {
+ ValueNumberInfo[DstValNo] = ValueNumberInfo[SrcValNo];
+ }
+ void copyValNumInfo(unsigned DstValNo, const LiveInterval &SrcLI,
+ unsigned SrcValNo) {
+ ValueNumberInfo[DstValNo] = SrcLI.ValueNumberInfo[SrcValNo];
+ }
+
/// 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
/// the intervals are not joinable, this aborts.
void join(LiveInterval &Other, int *ValNoAssignments,
int *RHSValNoAssignments,
- SmallVector<std::pair<unsigned,unsigned>,16> &NewValueNumberInfo);
+ SmallVector<VNInfo,16> &NewValueNumberInfo);
/// removeRange - Remove the specified range from this interval. Note that
/// the range must already be in this interval in its entirety.
removeRange(LR.start, LR.end);
}
+ /// getSize - Returns the sum of sizes of all the LiveRange's.
+ ///
+ unsigned getSize() const;
+
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:
projects / oota-llvm.git / blobdiff