diff options
Diffstat (limited to 'llvm/lib/CodeGen/MachineScheduler.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineScheduler.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp index 0985f47..6e9a4a7 100644 --- a/llvm/lib/CodeGen/MachineScheduler.cpp +++ b/llvm/lib/CodeGen/MachineScheduler.cpp @@ -967,6 +967,12 @@ void ScheduleDAGMI::releaseSucc(SUnit *SU, SDep *SuccEdge) { /// releaseSuccessors - Call releaseSucc on each of SU's successors. void ScheduleDAGMI::releaseSuccessors(SUnit *SU) { + // Reset the next successor, For example, we want to cluster A B C. + // After A is picked, we will set B as next cluster succ, but if we pick + // D instead of B after A, then we need to reset the next cluster succ because + // we have decided to not pick the cluster candidate B during pickNode(). + // Leaving B as the NextClusterSucc just make things messy. + NextClusterSucc = nullptr; for (SDep &Succ : SU->Succs) releaseSucc(SU, &Succ); } @@ -1004,6 +1010,7 @@ void ScheduleDAGMI::releasePred(SUnit *SU, SDep *PredEdge) { /// releasePredecessors - Call releasePred on each of SU's predecessors. void ScheduleDAGMI::releasePredecessors(SUnit *SU) { + NextClusterPred = nullptr; for (SDep &Pred : SU->Preds) releasePred(SU, &Pred); } |