mi-sched: Reorder Cyclicpath (latency) and CriticalMax (pressure) heuristics.
The latency based scheduling could induce spills in some cases.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190177 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineScheduler.cpp b/lib/CodeGen/MachineScheduler.cpp
index b854a13..7d957b5 100644
--- a/lib/CodeGen/MachineScheduler.cpp
+++ b/lib/CodeGen/MachineScheduler.cpp
@@ -2469,16 +2469,16 @@
TryCand, Cand, RegExcess))
return;
- // For loops that are acyclic path limited, aggressively schedule for latency.
- if (Rem.IsAcyclicLatencyLimited && tryLatency(TryCand, Cand, Zone))
- return;
-
// Avoid increasing the max critical pressure in the scheduled region.
if (DAG->isTrackingPressure() && tryPressure(TryCand.RPDelta.CriticalMax,
Cand.RPDelta.CriticalMax,
TryCand, Cand, RegCritical))
return;
+ // For loops that are acyclic path limited, aggressively schedule for latency.
+ if (Rem.IsAcyclicLatencyLimited && tryLatency(TryCand, Cand, Zone))
+ return;
+
// Keep clustered nodes together to encourage downstream peephole
// optimizations which may reduce resource requirements.
//