Teach if-converter to be more careful with predicating instructions that would
take multiple cycles to decode.
For the current if-converter clients (actually only ARM), the instructions that
are predicated on false are not nops. They would still take machine cycles to
decode. Micro-coded instructions such as LDM / STM can potentially take multiple
cycles to decode. If-converter should take treat them as non-micro-coded
simple instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113570 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/TargetInstrInfo.cpp b/lib/Target/TargetInstrInfo.cpp
index 118afd4..47cd0fb 100644
--- a/lib/Target/TargetInstrInfo.cpp
+++ b/lib/Target/TargetInstrInfo.cpp
@@ -50,12 +50,12 @@
unsigned
TargetInstrInfo::getNumMicroOps(const MachineInstr *MI,
- const InstrItineraryData &ItinData) const {
- if (ItinData.isEmpty())
+ const InstrItineraryData *ItinData) const {
+ if (!ItinData || ItinData->isEmpty())
return 1;
unsigned Class = MI->getDesc().getSchedClass();
- unsigned UOps = ItinData.Itineratries[Class].NumMicroOps;
+ unsigned UOps = ItinData->Itineratries[Class].NumMicroOps;
if (UOps)
return UOps;