Add debugging code to the packetizer

llvm-svn: 275455

1 files changed, 25 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/DFAPacketizer.cpp b/llvm/lib/CodeGen/DFAPacketizer.cpp
index a92d17cb38f..2386af9e687 100644
--- a/llvm/lib/CodeGen/DFAPacketizer.cpp
+++ b/llvm/lib/CodeGen/DFAPacketizer.cpp
@@ -23,6 +23,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#define DEBUG_TYPE "packets"
+
 #include "llvm/CodeGen/DFAPacketizer.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineInstrBundle.h"
@@ -222,6 +224,7 @@ void VLIWPacketizerList::endPacket(MachineBasicBlock *MBB,
   }
   CurrentPacketMIs.clear();
   ResourceTracker->clearResources();
+  DEBUG(dbgs() << "End packet\n");
 }
 
 
@@ -235,6 +238,12 @@ void VLIWPacketizerList::PacketizeMIs(MachineBasicBlock *MBB,
                              std::distance(BeginItr, EndItr));
   VLIWScheduler->schedule();
 
+  DEBUG({
+    dbgs() << "Scheduling DAG of the packetize region\n";
+    for (SUnit &SU : VLIWScheduler->SUnits)
+      SU.dumpAll(VLIWScheduler);
+  });
+
   // Generate MI -> SU map.
   MIToSUnit.clear();
   for (SUnit &SU : VLIWScheduler->SUnits)
@@ -259,30 +268,46 @@ void VLIWPacketizerList::PacketizeMIs(MachineBasicBlock *MBB,
     assert(SUI && "Missing SUnit Info!");
 
     // Ask DFA if machine resource is available for MI.
+    DEBUG(dbgs() << "Checking resources for adding MI to packet " << MI);
+
     bool ResourceAvail = ResourceTracker->canReserveResources(MI);
+    DEBUG({
+      if (ResourceAvail)
+        dbgs() << "  Resources are available for adding MI to packet\n";
+      else
+        dbgs() << "  Resources NOT available\n";
+    });
     if (ResourceAvail && shouldAddToPacket(MI)) {
       // Dependency check for MI with instructions in CurrentPacketMIs.
       for (auto MJ : CurrentPacketMIs) {
         SUnit *SUJ = MIToSUnit[MJ];
         assert(SUJ && "Missing SUnit Info!");
 
+        DEBUG(dbgs() << "  Checking against MJ " << *MJ);
         // Is it legal to packetize SUI and SUJ together.
         if (!isLegalToPacketizeTogether(SUI, SUJ)) {
+          DEBUG(dbgs() << "  Not legal to add MI, try to prune\n");
           // Allow packetization if dependency can be pruned.
           if (!isLegalToPruneDependencies(SUI, SUJ)) {
             // End the packet if dependency cannot be pruned.
+            DEBUG(dbgs() << "  Could not prune dependencies for adding MI\n");
             endPacket(MBB, MI);
             break;
           }
+          DEBUG(dbgs() << "  Pruned dependence for adding MI\n");
         }
       }
     } else {
+      DEBUG(if (ResourceAvail)
+        dbgs() << "Resources are available, but instruction should not be "
+                  "added to packet\n  " << MI);
       // End the packet if resource is not available, or if the instruction
       // shoud not be added to the current packet.
       endPacket(MBB, MI);
     }
 
     // Add MI to the current packet.
+    DEBUG(dbgs() << "* Adding MI to packet " << MI << '\n');
     BeginItr = addToPacket(MI);
   } // For all instructions in the packetization range.