diff options
| -rw-r--r-- | llvm/include/llvm/CodeGen/MachineScheduler.h | 6 | ||||
| -rw-r--r-- | llvm/lib/CodeGen/MachineScheduler.cpp | 4 |
2 files changed, 7 insertions, 3 deletions
diff --git a/llvm/include/llvm/CodeGen/MachineScheduler.h b/llvm/include/llvm/CodeGen/MachineScheduler.h index 081bf8f471f..9d3212e3e9d 100644 --- a/llvm/include/llvm/CodeGen/MachineScheduler.h +++ b/llvm/include/llvm/CodeGen/MachineScheduler.h @@ -156,8 +156,12 @@ struct MachineSchedPolicy { bool OnlyTopDown; bool OnlyBottomUp; + // Disable heuristic that tries to fetch nodes from long dependency chains + // first. + bool DisableLatencyHeuristic; + MachineSchedPolicy(): ShouldTrackPressure(false), OnlyTopDown(false), - OnlyBottomUp(false) {} + OnlyBottomUp(false), DisableLatencyHeuristic(false) {} }; /// MachineSchedStrategy - Interface to the scheduling algorithm used by diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp index 7e5ae05781e..ee2dbc86bf1 100644 --- a/llvm/lib/CodeGen/MachineScheduler.cpp +++ b/llvm/lib/CodeGen/MachineScheduler.cpp @@ -2722,8 +2722,8 @@ void GenericScheduler::tryCandidate(SchedCandidate &Cand, // Avoid serializing long latency dependence chains. // For acyclic path limited loops, latency was already checked above. - if (Cand.Policy.ReduceLatency && !Rem.IsAcyclicLatencyLimited - && tryLatency(TryCand, Cand, Zone)) { + if (!RegionPolicy.DisableLatencyHeuristic && Cand.Policy.ReduceLatency && + !Rem.IsAcyclicLatencyLimited && tryLatency(TryCand, Cand, Zone)) { return; } |
