diff options
Diffstat (limited to 'lib/CodeGen/MachineScheduler.cpp')
| -rw-r--r-- | lib/CodeGen/MachineScheduler.cpp | 12 |
1 files changed, 2 insertions, 10 deletions
diff --git a/lib/CodeGen/MachineScheduler.cpp b/lib/CodeGen/MachineScheduler.cpp index 117b2bd..a32df78 100644 --- a/lib/CodeGen/MachineScheduler.cpp +++ b/lib/CodeGen/MachineScheduler.cpp @@ -48,15 +48,6 @@ static cl::opt<unsigned> MISchedCutoff("misched-cutoff", cl::Hidden, static bool ViewMISchedDAGs = false; #endif // NDEBUG -// Threshold to very roughly model an out-of-order processor's instruction -// buffers. If the actual value of this threshold matters much in practice, then -// it can be specified by the machine model. For now, it's an experimental -// tuning knob to determine when and if it matters. -static cl::opt<unsigned> ILPWindow("ilp-window", cl::Hidden, - cl::desc("Allow expected latency to exceed the critical path by N cycles " - "before attempting to balance ILP"), - cl::init(10U)); - // Experimental heuristics static cl::opt<bool> EnableLoadCluster("misched-cluster", cl::Hidden, cl::desc("Enable load clustering."), cl::init(true)); @@ -1297,7 +1288,8 @@ void ConvergingScheduler::SchedBoundary::setLatencyPolicy(CandPolicy &Policy) { if (L > RemLatency) RemLatency = L; } - if (RemLatency + ExpectedLatency >= Rem->CriticalPath + ILPWindow + unsigned CriticalPathLimit = Rem->CriticalPath + SchedModel->getILPWindow(); + if (RemLatency + ExpectedLatency >= CriticalPathLimit && RemLatency > Rem->getMaxRemainingCount(SchedModel)) { Policy.ReduceLatency = true; DEBUG(dbgs() << "Increase ILP: " << Available.getName() << '\n'); |