mi-sched: Reuse an invalid HazardRecognizer to save compile time.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189989 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineScheduler.cpp b/lib/CodeGen/MachineScheduler.cpp
index 6b9dd3e..0aacc3a 100644
--- a/lib/CodeGen/MachineScheduler.cpp
+++ b/lib/CodeGen/MachineScheduler.cpp
@@ -1469,13 +1469,16 @@
void reset() {
// A new HazardRec is created for each DAG and owned by SchedBoundary.
- delete HazardRec;
-
+ // Detroying and reconstructing it is very expensive though. So keep
+ // invalid, placeholder HazardRecs.
+ if (HazardRec && HazardRec->isEnabled()) {
+ delete HazardRec;
+ HazardRec = 0;
+ }
Available.clear();
Pending.clear();
CheckPending = false;
NextSUs.clear();
- HazardRec = 0;
CurrCycle = 0;
CurrMOps = 0;
MinReadyCycle = UINT_MAX;
@@ -1681,9 +1684,14 @@
// are disabled, then these HazardRecs will be disabled.
const InstrItineraryData *Itin = SchedModel->getInstrItineraries();
const TargetMachine &TM = DAG->MF.getTarget();
- Top.HazardRec = TM.getInstrInfo()->CreateTargetMIHazardRecognizer(Itin, DAG);
- Bot.HazardRec = TM.getInstrInfo()->CreateTargetMIHazardRecognizer(Itin, DAG);
-
+ if (!Top.HazardRec) {
+ Top.HazardRec =
+ TM.getInstrInfo()->CreateTargetMIHazardRecognizer(Itin, DAG);
+ }
+ if (!Bot.HazardRec) {
+ Bot.HazardRec =
+ TM.getInstrInfo()->CreateTargetMIHazardRecognizer(Itin, DAG);
+ }
assert((!ForceTopDown || !ForceBottomUp) &&
"-misched-topdown incompatible with -misched-bottomup");
}