[llvm] r311444 - [SelectionDAG] Add getNode debug messages

[Sjoerd Meijer via llvm-commits]

Author: sjoerdmeijer
Date: Tue Aug 22 03:43:51 2017
New Revision: 311444

URL: http://llvm.org/viewvc/llvm-project?rev=311444&view=rev
Log:
[SelectionDAG] Add getNode debug messages

This adds debug messages to various functions that create new SDValue nodes.
This is e.g. useful to have during legalization, as otherwise it can prints
legalization info of nodes that did not appear in the dumps before.

Differential Revision: https://reviews.llvm.org/D36984

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp?rev=311444&r1=311443&r2=311444&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp Tue Aug 22 03:43:51 2017
@@ -87,6 +87,15 @@ static SDVTList makeVTList(const EVT *VT
 void SelectionDAG::DAGUpdateListener::NodeDeleted(SDNode*, SDNode*) {}
 void SelectionDAG::DAGUpdateListener::NodeUpdated(SDNode*) {}
 
+#define DEBUG_TYPE "selectiondag"
+
+static void NewSDValueDbgMsg(SDValue V, StringRef Msg) {
+  DEBUG(
+    dbgs() << Msg;
+    V.dump();
+  );
+}
+
 //===----------------------------------------------------------------------===//
 //                              ConstantFPSDNode Class
 //===----------------------------------------------------------------------===//
@@ -1158,7 +1167,10 @@ SDValue SelectionDAG::getConstant(const
     SmallVector<SDValue, 8> Ops;
     for (unsigned i = 0, e = VT.getVectorNumElements(); i != e; ++i)
       Ops.insert(Ops.end(), EltParts.begin(), EltParts.end());
-    return getNode(ISD::BITCAST, DL, VT, getBuildVector(ViaVecVT, DL, Ops));
+
+    SDValue V = getNode(ISD::BITCAST, DL, VT, getBuildVector(ViaVecVT, DL, Ops));
+    NewSDValueDbgMsg(V, "Creating constant: ");
+    return V;
   }
 
   assert(Elt->getBitWidth() == EltVT.getSizeInBits() &&
@@ -1183,6 +1195,8 @@ SDValue SelectionDAG::getConstant(const
   SDValue Result(N, 0);
   if (VT.isVector())
     Result = getSplatBuildVector(VT, DL, Result);
+
+  NewSDValueDbgMsg(Result, "Creating constant: ");
   return Result;
 }
 
@@ -1224,6 +1238,7 @@ SDValue SelectionDAG::getConstantFP(cons
   SDValue Result(N, 0);
   if (VT.isVector())
     Result = getSplatBuildVector(VT, DL, Result);
+  NewSDValueDbgMsg(Result, "Creating fp constant: ");
   return Result;
 }
 
@@ -3456,7 +3471,9 @@ static SDValue FoldCONCAT_VECTORS(const
                ? DAG.getZExtOrTrunc(Op, DL, SVT)
                : DAG.getSExtOrTrunc(Op, DL, SVT);
 
-  return DAG.getBuildVector(VT, DL, Elts);
+  SDValue V = DAG.getBuildVector(VT, DL, Elts);
+  NewSDValueDbgMsg(V, "New node fold concat vectors: ");
+  return V;
 }
 
 /// Gets or creates the specified node.
@@ -3472,7 +3489,9 @@ SDValue SelectionDAG::getNode(unsigned O
   CSEMap.InsertNode(N, IP);
 
   InsertNode(N);
-  return SDValue(N, 0);
+  SDValue V = SDValue(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ");
+  return V;
 }
 
 SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,
@@ -3833,7 +3852,9 @@ SDValue SelectionDAG::getNode(unsigned O
   }
 
   InsertNode(N);
-  return SDValue(N, 0);
+  SDValue V = SDValue(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ");
+  return V;
 }
 
 static std::pair<APInt, bool> FoldValue(unsigned Opcode, const APInt &C1,
@@ -4106,7 +4127,9 @@ SDValue SelectionDAG::FoldConstantVector
     ScalarResults.push_back(ScalarResult);
   }
 
-  return getBuildVector(VT, DL, ScalarResults);
+  SDValue V = getBuildVector(VT, DL, ScalarResults);
+  NewSDValueDbgMsg(V, "New node fold constant vector: ");
+  return V;
 }
 
 SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,
@@ -4606,7 +4629,9 @@ SDValue SelectionDAG::getNode(unsigned O
   }
 
   InsertNode(N);
-  return SDValue(N, 0);
+  SDValue V = SDValue(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ");
+  return V;
 }
 
 SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,
@@ -4641,8 +4666,10 @@ SDValue SelectionDAG::getNode(unsigned O
       return V;
     // Vector constant folding.
     SDValue Ops[] = {N1, N2, N3};
-    if (SDValue V = FoldConstantVectorArithmetic(Opcode, DL, VT, Ops))
+    if (SDValue V = FoldConstantVectorArithmetic(Opcode, DL, VT, Ops)) {
+      NewSDValueDbgMsg(V, "New node vector constant folding: ");
       return V;
+    }
     break;
   }
   case ISD::SELECT:
@@ -4714,7 +4741,9 @@ SDValue SelectionDAG::getNode(unsigned O
   }
 
   InsertNode(N);
-  return SDValue(N, 0);
+  SDValue V = SDValue(N, 0);
+  NewSDValueDbgMsg(V, "Creating new node: ");
+  return V;
 }
 
 SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT,