Schedule high latency instructions for latency reduction even if they are not vfp / NEON instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105060 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index d724ba3..ef2f07b 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -605,11 +605,29 @@
}
Sched::Preference ARMTargetLowering::getSchedulingPreference(SDNode *N) const {
- for (unsigned i = 0, e = N->getNumValues(); i != e; ++i) {
+ unsigned NumVals = N->getNumValues();
+ if (!NumVals)
+ return Sched::RegPressure;
+
+ for (unsigned i = 0; i != NumVals; ++i) {
EVT VT = N->getValueType(i);
if (VT.isFloatingPoint() || VT.isVector())
return Sched::Latency;
}
+
+ if (!N->isMachineOpcode())
+ return Sched::RegPressure;
+
+ // Load are scheduled for latency even if there instruction itinerary
+ // is not available.
+ const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+ const TargetInstrDesc &TID = TII->get(N->getMachineOpcode());
+ if (TID.mayLoad())
+ return Sched::Latency;
+
+ const InstrItineraryData &Itins = getTargetMachine().getInstrItineraryData();
+ if (!Itins.isEmpty() && Itins.getStageLatency(TID.getSchedClass()) > 2)
+ return Sched::Latency;
return Sched::RegPressure;
}