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misched: try (not too hard) to place debug values where they belong
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155458 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -359,6 +359,8 @@ protected:
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void releaseSuccessors(SUnit *SU);
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void releasePred(SUnit *SU, SDep *PredEdge);
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void releasePredecessors(SUnit *SU);
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void placeDebugValues();
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};
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} // namespace
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@ -526,6 +528,29 @@ void ScheduleDAGMI::schedule() {
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SU->isScheduled = true;
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}
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assert(CurrentTop == CurrentBottom && "Nonempty unscheduled zone.");
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placeDebugValues();
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}
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/// Reinsert any remaining debug_values, just like the PostRA scheduler.
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void ScheduleDAGMI::placeDebugValues() {
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// If first instruction was a DBG_VALUE then put it back.
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if (FirstDbgValue) {
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BB->splice(RegionBegin, BB, FirstDbgValue);
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RegionBegin = FirstDbgValue;
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}
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for (std::vector<std::pair<MachineInstr *, MachineInstr *> >::iterator
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DI = DbgValues.end(), DE = DbgValues.begin(); DI != DE; --DI) {
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std::pair<MachineInstr *, MachineInstr *> P = *prior(DI);
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MachineInstr *DbgValue = P.first;
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MachineBasicBlock::iterator OrigPrevMI = P.second;
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BB->splice(++OrigPrevMI, BB, DbgValue);
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if (OrigPrevMI == llvm::prior(RegionEnd))
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RegionEnd = DbgValue;
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}
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DbgValues.clear();
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FirstDbgValue = NULL;
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}
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//===----------------------------------------------------------------------===//
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