[Packetizer] Add AliasAnalysis as a parameter to the packetizer

This will make the depedence graph more accurate if an alias analysis
is provided. If nullptr is specified in its place, the behavior will
remain as it is currently.

llvm-svn: 255540

1 files changed, 11 insertions, 7 deletions

diff --git a/llvm/lib/CodeGen/DFAPacketizer.cpp b/llvm/lib/CodeGen/DFAPacketizer.cpp
index 0970812..80e03d9 100644
--- a/llvm/lib/CodeGen/DFAPacketizer.cpp
+++ b/llvm/lib/CodeGen/DFAPacketizer.cpp
@@ -149,31 +149,35 @@ namespace llvm {
 // DefaultVLIWScheduler - This class extends ScheduleDAGInstrs and overrides
 // Schedule method to build the dependence graph.
 class DefaultVLIWScheduler : public ScheduleDAGInstrs {
+private:
+  AliasAnalysis *AA;
 public:
-  DefaultVLIWScheduler(MachineFunction &MF, MachineLoopInfo &MLI);
+  DefaultVLIWScheduler(MachineFunction &MF, MachineLoopInfo &MLI,
+                       AliasAnalysis *AA);
   // Schedule - Actual scheduling work.
   void schedule() override;
 };
 }
 
 DefaultVLIWScheduler::DefaultVLIWScheduler(MachineFunction &MF,
-                                           MachineLoopInfo &MLI)
-    : ScheduleDAGInstrs(MF, &MLI) {
+                                           MachineLoopInfo &MLI,
+                                           AliasAnalysis *AA)
+    : ScheduleDAGInstrs(MF, &MLI), AA(AA) {
   CanHandleTerminators = true;
 }
 
 void DefaultVLIWScheduler::schedule() {
   // Build the scheduling graph.
-  buildSchedGraph(nullptr);
+  buildSchedGraph(AA);
 }
 
 // VLIWPacketizerList Ctor
 VLIWPacketizerList::VLIWPacketizerList(MachineFunction &MF,
-                                       MachineLoopInfo &MLI)
-    : MF(MF) {
+                                       MachineLoopInfo &MLI, AliasAnalysis *AA)
+    : MF(MF), AA(AA) {
   TII = MF.getSubtarget().getInstrInfo();
   ResourceTracker = TII->CreateTargetScheduleState(MF.getSubtarget());
-  VLIWScheduler = new DefaultVLIWScheduler(MF, MLI);
+  VLIWScheduler = new DefaultVLIWScheduler(MF, MLI, AA);
 }
 
 // VLIWPacketizerList Dtor