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Iterative coallescing doesn't buy us anything (we get identical results on
crafty with and without it). Removing it speeds up live intervals 6%. llvm-svn: 30010
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@ -53,17 +53,6 @@ namespace llvm {
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std::vector<bool> allocatableRegs_;
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std::vector<bool> allocatableRegs_;
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public:
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public:
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struct CopyRec {
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MachineInstr *MI;
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unsigned SrcReg, DstReg;
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};
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CopyRec getCopyRec(MachineInstr *MI, unsigned SrcReg, unsigned DstReg) {
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CopyRec R;
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R.MI = MI;
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R.SrcReg = SrcReg;
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R.DstReg = DstReg;
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return R;
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}
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struct InstrSlots {
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struct InstrSlots {
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enum {
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enum {
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LOAD = 0,
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LOAD = 0,
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@ -161,10 +150,8 @@ namespace llvm {
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/// joinIntervals - join compatible live intervals
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/// joinIntervals - join compatible live intervals
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void joinIntervals();
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void joinIntervals();
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/// CopyCoallesceInMBB - Coallsece copies in the specified MBB, putting
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/// CopyCoallesceInMBB - Coallsece copies in the specified MBB.
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/// copies that cannot yet be coallesced into the "TryAgain" list.
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void CopyCoallesceInMBB(MachineBasicBlock *MBB);
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void CopyCoallesceInMBB(MachineBasicBlock *MBB,
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std::vector<CopyRec> &TryAgain);
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/// JoinCopy - Attempt to join intervals corresponding to SrcReg/DstReg,
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/// JoinCopy - Attempt to join intervals corresponding to SrcReg/DstReg,
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/// which are the src/dst of the copy instruction CopyMI. This returns true
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/// which are the src/dst of the copy instruction CopyMI. This returns true
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@ -1066,8 +1066,7 @@ namespace {
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}
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}
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void LiveIntervals::CopyCoallesceInMBB(MachineBasicBlock *MBB,
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void LiveIntervals::CopyCoallesceInMBB(MachineBasicBlock *MBB) {
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std::vector<CopyRec> &TryAgain) {
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DEBUG(std::cerr << ((Value*)MBB->getBasicBlock())->getName() << ":\n");
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DEBUG(std::cerr << ((Value*)MBB->getBasicBlock())->getName() << ":\n");
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for (MachineBasicBlock::iterator MII = MBB->begin(), E = MBB->end();
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for (MachineBasicBlock::iterator MII = MBB->begin(), E = MBB->end();
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@ -1078,8 +1077,7 @@ void LiveIntervals::CopyCoallesceInMBB(MachineBasicBlock *MBB,
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unsigned SrcReg, DstReg;
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unsigned SrcReg, DstReg;
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if (!tii_->isMoveInstr(*Inst, SrcReg, DstReg)) continue;
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if (!tii_->isMoveInstr(*Inst, SrcReg, DstReg)) continue;
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if (!JoinCopy(Inst, SrcReg, DstReg))
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JoinCopy(Inst, SrcReg, DstReg);
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TryAgain.push_back(getCopyRec(Inst, SrcReg, DstReg));
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}
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}
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}
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}
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@ -1087,14 +1085,12 @@ void LiveIntervals::CopyCoallesceInMBB(MachineBasicBlock *MBB,
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void LiveIntervals::joinIntervals() {
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void LiveIntervals::joinIntervals() {
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DEBUG(std::cerr << "********** JOINING INTERVALS ***********\n");
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DEBUG(std::cerr << "********** JOINING INTERVALS ***********\n");
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std::vector<CopyRec> TryAgainList;
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const LoopInfo &LI = getAnalysis<LoopInfo>();
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const LoopInfo &LI = getAnalysis<LoopInfo>();
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if (LI.begin() == LI.end()) {
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if (LI.begin() == LI.end()) {
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// If there are no loops in the function, join intervals in function order.
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// If there are no loops in the function, join intervals in function order.
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for (MachineFunction::iterator I = mf_->begin(), E = mf_->end();
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for (MachineFunction::iterator I = mf_->begin(), E = mf_->end();
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I != E; ++I)
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I != E; ++I)
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CopyCoallesceInMBB(I, TryAgainList);
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CopyCoallesceInMBB(I);
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} else {
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} else {
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// Otherwise, join intervals in inner loops before other intervals.
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// Otherwise, join intervals in inner loops before other intervals.
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// Unfortunately we can't just iterate over loop hierarchy here because
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// Unfortunately we can't just iterate over loop hierarchy here because
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@ -1109,23 +1105,7 @@ void LiveIntervals::joinIntervals() {
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// Finally, join intervals in loop nest order.
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// Finally, join intervals in loop nest order.
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for (unsigned i = 0, e = MBBs.size(); i != e; ++i)
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for (unsigned i = 0, e = MBBs.size(); i != e; ++i)
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CopyCoallesceInMBB(MBBs[i].second, TryAgainList);
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CopyCoallesceInMBB(MBBs[i].second);
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}
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// Joining intervals can allow other intervals to be joined. Iteratively join
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// until we make no progress.
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bool ProgressMade = true;
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while (ProgressMade) {
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ProgressMade = false;
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for (unsigned i = 0, e = TryAgainList.size(); i != e; ++i) {
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CopyRec &TheCopy = TryAgainList[i];
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if (TheCopy.MI &&
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JoinCopy(TheCopy.MI, TheCopy.SrcReg, TheCopy.DstReg)) {
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TheCopy.MI = 0; // Mark this one as done.
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ProgressMade = true;
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}
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}
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}
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}
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DEBUG(std::cerr << "*** Register mapping ***\n");
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DEBUG(std::cerr << "*** Register mapping ***\n");
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