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misched: try (not too hard) to place debug values where they belong

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llvm-svn: 155458
This commit is contained in:
Andrew Trick 2012-04-24 18:04:37 +00:00
parent 02daf554b7
commit 0b0b66833e
1 changed files with 25 additions and 0 deletions
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25
lib/CodeGen/MachineScheduler.cpp
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@ -359,6 +359,8 @@ protected:
void releaseSuccessors(SUnit *SU);
void releasePred(SUnit *SU, SDep *PredEdge);
void releasePredecessors(SUnit *SU);
void placeDebugValues();
};
} // namespace
@ -526,6 +528,29 @@ void ScheduleDAGMI::schedule() {
SU->isScheduled = true;
}
assert(CurrentTop == CurrentBottom && "Nonempty unscheduled zone.");
placeDebugValues();
}
/// Reinsert any remaining debug_values, just like the PostRA scheduler.
void ScheduleDAGMI::placeDebugValues() {
// If first instruction was a DBG_VALUE then put it back.
if (FirstDbgValue) {
BB->splice(RegionBegin, BB, FirstDbgValue);
RegionBegin = FirstDbgValue;
}
for (std::vector<std::pair<MachineInstr *, MachineInstr *> >::iterator
DI = DbgValues.end(), DE = DbgValues.begin(); DI != DE; --DI) {
std::pair<MachineInstr *, MachineInstr *> P = *prior(DI);
MachineInstr *DbgValue = P.first;
MachineBasicBlock::iterator OrigPrevMI = P.second;
BB->splice(++OrigPrevMI, BB, DbgValue);
if (OrigPrevMI == llvm::prior(RegionEnd))
RegionEnd = DbgValue;
}
DbgValues.clear();
FirstDbgValue = NULL;
}
//===----------------------------------------------------------------------===//