[SelectionDAG] Add some debug print messages to LegalizeVectorOps.

llvm-svn: 321535

1 files changed, 15 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
index 74970ab5792..7643790df35 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
@@ -49,6 +49,8 @@
 
 using namespace llvm;
 
+#define DEBUG_TYPE "legalizevectorops"
+
 namespace {
 
 class VectorLegalizer {
@@ -226,7 +228,8 @@ SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
   if (Op.getOpcode() == ISD::LOAD) {
     LoadSDNode *LD = cast<LoadSDNode>(Op.getNode());
     ISD::LoadExtType ExtType = LD->getExtensionType();
-    if (LD->getMemoryVT().isVector() && ExtType != ISD::NON_EXTLOAD)
+    if (LD->getMemoryVT().isVector() && ExtType != ISD::NON_EXTLOAD) {
+      DEBUG(dbgs() << "\nLegalizing extending vector load: "; Node->dump(&DAG));
       switch (TLI.getLoadExtAction(LD->getExtensionType(), LD->getValueType(0),
                                    LD->getMemoryVT())) {
       default: llvm_unreachable("This action is not supported yet!");
@@ -252,11 +255,14 @@ SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
         Changed = true;
         return LegalizeOp(ExpandLoad(Op));
       }
+    }
   } else if (Op.getOpcode() == ISD::STORE) {
     StoreSDNode *ST = cast<StoreSDNode>(Op.getNode());
     EVT StVT = ST->getMemoryVT();
     MVT ValVT = ST->getValue().getSimpleValueType();
-    if (StVT.isVector() && ST->isTruncatingStore())
+    if (StVT.isVector() && ST->isTruncatingStore()) {
+      DEBUG(dbgs() << "\nLegalizing truncating vector store: ";
+            Node->dump(&DAG));
       switch (TLI.getTruncStoreAction(ValVT, StVT)) {
       default: llvm_unreachable("This action is not supported yet!");
       case TargetLowering::Legal:
@@ -270,6 +276,7 @@ SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
         Changed = true;
         return LegalizeOp(ExpandStore(Op));
       }
+    }
   } else if (Op.getOpcode() == ISD::MSCATTER || Op.getOpcode() == ISD::MSTORE)
     HasVectorValue = true;
 
@@ -376,6 +383,8 @@ SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
     break;
   }
 
+  DEBUG(dbgs() << "\nLegalizing vector op: "; Node->dump(&DAG));
+
   switch (TLI.getOperationAction(Node->getOpcode(), QueryType)) {
   default: llvm_unreachable("This action is not supported yet!");
   case TargetLowering::Promote:
@@ -383,12 +392,16 @@ SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
     Changed = true;
     break;
   case TargetLowering::Legal:
+    DEBUG(dbgs() << "Legal node: nothing to do\n");
     break;
   case TargetLowering::Custom: {
+    DEBUG(dbgs() << "Trying custom legalization\n");
     if (SDValue Tmp1 = TLI.LowerOperation(Op, DAG)) {
+      DEBUG(dbgs() << "Successfully custom legalized node\n");
       Result = Tmp1;
       break;
     }
+    DEBUG(dbgs() << "Could not custom legalize node\n");
     LLVM_FALLTHROUGH;
   }
   case TargetLowering::Expand: