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Use a multimap rather than a map for holding the list of copies to insert, so we don't lose copies when two of them have
the same source. I don't know what I was thinking when I wrote this originally. Note: There's probably a more efficient way to do this, but I need to think about it some more, and about what determinism guarantees need to be present. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56964 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -44,7 +44,7 @@ namespace {
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// Waiting stores, for each MBB, the set of copies that need to
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// be inserted into that MBB
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DenseMap<MachineBasicBlock*,
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std::map<unsigned, unsigned> > Waiting;
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std::multimap<unsigned, unsigned> > Waiting;
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// Stacks holds the renaming stack for each register
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std::map<unsigned, std::vector<unsigned> > Stacks;
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@ -647,9 +647,9 @@ void StrongPHIElimination::processPHIUnion(MachineInstr* Inst,
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void StrongPHIElimination::ScheduleCopies(MachineBasicBlock* MBB,
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std::set<unsigned>& pushed) {
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// FIXME: This function needs to update LiveIntervals
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std::map<unsigned, unsigned>& copy_set= Waiting[MBB];
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std::multimap<unsigned, unsigned>& copy_set= Waiting[MBB];
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std::map<unsigned, unsigned> worklist;
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std::multimap<unsigned, unsigned> worklist;
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std::map<unsigned, unsigned> map;
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// Setup worklist of initial copies
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@ -662,9 +662,9 @@ void StrongPHIElimination::ScheduleCopies(MachineBasicBlock* MBB,
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worklist.insert(*I);
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// Avoid iterator invalidation
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unsigned first = I->first;
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std::multimap<unsigned, unsigned>::iterator OI = I;
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++I;
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copy_set.erase(first);
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copy_set.erase(OI);
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} else {
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++I;
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}
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@ -680,8 +680,9 @@ void StrongPHIElimination::ScheduleCopies(MachineBasicBlock* MBB,
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// Iterate over the worklist, inserting copies
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while (!worklist.empty() || !copy_set.empty()) {
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while (!worklist.empty()) {
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std::pair<unsigned, unsigned> curr = *worklist.begin();
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worklist.erase(curr.first);
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std::multimap<unsigned, unsigned>::iterator WI = worklist.begin();
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std::pair<unsigned, unsigned> curr = *WI;
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worklist.erase(WI);
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const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(curr.first);
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@ -695,6 +696,8 @@ void StrongPHIElimination::ScheduleCopies(MachineBasicBlock* MBB,
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TII->copyRegToReg(*PI->getParent(), PI, t,
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curr.second, RC, RC);
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DOUT << "Inserted copy from " << curr.second << " to " << t << "\n";
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// Push temporary on Stacks
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Stacks[curr.second].push_back(t);
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@ -709,6 +712,8 @@ void StrongPHIElimination::ScheduleCopies(MachineBasicBlock* MBB,
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TII->copyRegToReg(*MBB, MBB->getFirstTerminator(), curr.second,
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map[curr.first], RC, RC);
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map[curr.first] = curr.second;
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DOUT << "Inserted copy from " << curr.first << " to "
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<< curr.second << "\n";
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// Push this copy onto InsertedPHICopies so we can
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// update LiveIntervals with it.
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@ -716,15 +721,16 @@ void StrongPHIElimination::ScheduleCopies(MachineBasicBlock* MBB,
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InsertedPHIDests.push_back(std::make_pair(curr.second, --MI));
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// If curr.first is a destination in copy_set...
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for (std::map<unsigned, unsigned>::iterator I = copy_set.begin(),
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for (std::multimap<unsigned, unsigned>::iterator I = copy_set.begin(),
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E = copy_set.end(); I != E; )
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if (curr.first == I->second) {
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std::pair<unsigned, unsigned> temp = *I;
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worklist.insert(temp);
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// Avoid iterator invalidation
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std::multimap<unsigned, unsigned>::iterator OI = I;
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++I;
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copy_set.erase(temp.first);
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worklist.insert(temp);
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copy_set.erase(OI);
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break;
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} else {
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@ -733,9 +739,10 @@ void StrongPHIElimination::ScheduleCopies(MachineBasicBlock* MBB,
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}
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if (!copy_set.empty()) {
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std::pair<unsigned, unsigned> curr = *copy_set.begin();
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copy_set.erase(curr.first);
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std::multimap<unsigned, unsigned>::iterator CI = copy_set.begin();
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std::pair<unsigned, unsigned> curr = *CI;
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worklist.insert(curr);
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copy_set.erase(CI);
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LiveInterval& I = LI.getInterval(curr.second);
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MachineBasicBlock::iterator term = MBB->getFirstTerminator();
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