1 files changed, 135 insertions, 19 deletions

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 954b842..7c9a001 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -456,6 +456,13 @@ static void AddNodeIDCustom(FoldingSetNodeID &ID, const SDNode *N) {
     ID.AddInteger(AT->getRawSubclassData());
     break;
   }
+  case ISD::VECTOR_SHUFFLE: {
+    const ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(N);
+    for (unsigned i = 0, e = N->getValueType(0).getVectorNumElements(); 
+         i != e; ++i)
+      ID.AddInteger(SVN->getMaskElt(i));
+    break;
+  }
   } // end switch (N->getOpcode())
 }
 
@@ -765,9 +772,9 @@ void SelectionDAG::VerifyNode(SDNode *N) {
     MVT EltVT = N->getValueType(0).getVectorElementType();
     for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I)
       assert((I->getValueType() == EltVT ||
-              (EltVT.isInteger() && I->getValueType().isInteger() &&
-               EltVT.bitsLE(I->getValueType()))) &&
-             "Wrong operand type!");
+             (EltVT.isInteger() && I->getValueType().isInteger() &&
+              EltVT.bitsLE(I->getValueType()))) &&
+            "Wrong operand type!");
     break;
   }
   }
@@ -1126,6 +1133,110 @@ SDValue SelectionDAG::getCondCode(ISD::CondCode Cond) {
   return SDValue(CondCodeNodes[Cond], 0);
 }
 
+static void commuteShuffle(SDValue &N1, SDValue &N2, SmallVectorImpl<int> &M) {
+  std::swap(N1, N2);
+  int NElts = M.size();
+  for (int i = 0; i != NElts; ++i) {
+    if (M[i] >= NElts)
+      M[i] -= NElts;
+    else if (M[i] >= 0)
+      M[i] += NElts;
+  }
+}
+
+SDValue SelectionDAG::getVectorShuffle(MVT VT, DebugLoc dl, SDValue N1, 
+                                       SDValue N2, const int *Mask) {
+  assert(N1.getValueType() == N2.getValueType() && "Invalid VECTOR_SHUFFLE");
+  assert(VT.isVector() && N1.getValueType().isVector() && 
+         "Vector Shuffle VTs must be a vectors");
+  assert(VT.getVectorElementType() == N1.getValueType().getVectorElementType()
+         && "Vector Shuffle VTs must have same element type");
+
+  // Canonicalize shuffle undef, undef -> undef
+  if (N1.getOpcode() == ISD::UNDEF && N2.getOpcode() == ISD::UNDEF)
+    return N1;
+
+  // Validate that all indices in Mask are within the range of the elements 
+  // input to the shuffle.
+  int NElts = VT.getVectorNumElements();
+  SmallVector<int, 8> MaskVec;
+  for (int i = 0; i != NElts; ++i) {
+    if (Mask[i] >= (NElts * 2)) {
+      assert(0 && "Index out of range");
+      return SDValue();
+    }
+    MaskVec.push_back(Mask[i]);
+  }
+  
+  // Canonicalize shuffle v, v -> v, undef
+  if (N1 == N2) {
+    N2 = getUNDEF(VT);
+    for (int i = 0; i != NElts; ++i)
+      if (MaskVec[i] >= NElts) MaskVec[i] -= NElts;
+  }
+  
+  // Canonicalize shuffle undef, v -> v, undef.  Commute the shuffle mask.
+  if (N1.getOpcode() == ISD::UNDEF)
+    commuteShuffle(N1, N2, MaskVec);
+  
+  // Canonicalize all index into lhs, -> shuffle lhs, undef
+  // Canonicalize all index into rhs, -> shuffle rhs, undef
+  bool AllLHS = true, AllRHS = true;
+  bool N2Undef = N2.getOpcode() == ISD::UNDEF;
+  for (int i = 0; i != NElts; ++i) {
+    if (MaskVec[i] >= NElts) {
+      if (N2Undef)
+        MaskVec[i] = -1;
+      else
+        AllLHS = false;
+    } else if (MaskVec[i] >= 0) {
+      AllRHS = false;
+    }
+  }
+  if (AllLHS && AllRHS)
+    return getUNDEF(VT);
+  if (AllLHS)
+    N2 = getUNDEF(VT);
+  if (AllRHS) {
+    N1 = getUNDEF(VT);
+    commuteShuffle(N1, N2, MaskVec);
+  }
+  
+  // If Identity shuffle, or all shuffle in to undef, return that node.
+  bool AllUndef = true;
+  bool Identity = true;
+  for (int i = 0; i < NElts; ++i) {
+    if (MaskVec[i] >= 0 && MaskVec[i] != i) Identity = false;
+    if (MaskVec[i] >= 0) AllUndef = false;
+  }
+  if (Identity)
+    return N1;
+  if (AllUndef)
+    return getUNDEF(VT);
+
+  FoldingSetNodeID ID;
+  SDValue Ops[2] = { N1, N2 };
+  AddNodeIDNode(ID, ISD::VECTOR_SHUFFLE, getVTList(VT), Ops, 2);
+  for (int i = 0; i != NElts; ++i)
+    ID.AddInteger(MaskVec[i]);
+  
+  void* IP = 0;
+  if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
+    return SDValue(E, 0);
+  
+  // Allocate the mask array for the node out of the BumpPtrAllocator, since
+  // SDNode doesn't have access to it.  This memory will be "leaked" when
+  // the node is deallocated, but recovered when the NodeAllocator is released.
+  int *MaskAlloc = OperandAllocator.Allocate<int>(NElts);
+  memcpy(MaskAlloc, &MaskVec[0], NElts * sizeof(int));
+  
+  ShuffleVectorSDNode *N = NodeAllocator.Allocate<ShuffleVectorSDNode>();
+  new (N) ShuffleVectorSDNode(VT, dl, N1, N2, MaskAlloc);
+  CSEMap.InsertNode(N, IP);
+  AllNodes.push_back(N);
+  return SDValue(N, 0);
+}
+
 SDValue SelectionDAG::getConvertRndSat(MVT VT, DebugLoc dl,
                                        SDValue Val, SDValue DTy,
                                        SDValue STy, SDValue Rnd, SDValue Sat,
@@ -2087,19 +2198,18 @@ bool SelectionDAG::isVerifiedDebugInfoDesc(SDValue Op) const {
 SDValue SelectionDAG::getShuffleScalarElt(const SDNode *N, unsigned i) {
   MVT VT = N->getValueType(0);
   DebugLoc dl = N->getDebugLoc();
-  SDValue PermMask = N->getOperand(2);
-  SDValue Idx = PermMask.getOperand(i);
-  if (Idx.getOpcode() == ISD::UNDEF)
+  const ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(N);
+  int Index = SVN->getMaskElt(i);
+  if (Index < 0)
     return getUNDEF(VT.getVectorElementType());
-  unsigned Index = cast<ConstantSDNode>(Idx)->getZExtValue();
-  unsigned NumElems = PermMask.getNumOperands();
+  int NumElems = VT.getVectorNumElements();
   SDValue V = (Index < NumElems) ? N->getOperand(0) : N->getOperand(1);
   Index %= NumElems;
 
   if (V.getOpcode() == ISD::BIT_CONVERT) {
     V = V.getOperand(0);
     MVT VVT = V.getValueType();
-    if (!VVT.isVector() || VVT.getVectorNumElements() != NumElems)
+    if (!VVT.isVector() || VVT.getVectorNumElements() != (unsigned)NumElems)
       return SDValue();
   }
   if (V.getOpcode() == ISD::SCALAR_TO_VECTOR)
@@ -2794,12 +2904,7 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, MVT VT,
     }
     break;
   case ISD::VECTOR_SHUFFLE:
-    assert(N1.getValueType() == N2.getValueType() &&
-           N1.getValueType().isVector() &&
-           VT.isVector() && N3.getValueType().isVector() &&
-           N3.getOpcode() == ISD::BUILD_VECTOR &&
-           VT.getVectorNumElements() == N3.getNumOperands() &&
-           "Illegal VECTOR_SHUFFLE node!");
+    assert(0 && "should use getVectorShuffle constructor!");
     break;
   case ISD::BIT_CONVERT:
     // Fold bit_convert nodes from a type to themselves.
@@ -5323,14 +5428,15 @@ void SDNode::print_types(raw_ostream &OS, const SelectionDAG *G) const {
 
 void SDNode::print_details(raw_ostream &OS, const SelectionDAG *G) const {
   if (!isTargetOpcode() && getOpcode() == ISD::VECTOR_SHUFFLE) {
-    SDNode *Mask = getOperand(2).getNode();
+    const ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(this);
     OS << "<";
-    for (unsigned i = 0, e = Mask->getNumOperands(); i != e; ++i) {
+    for (unsigned i = 0, e = ValueList[0].getVectorNumElements(); i != e; ++i) {
+      int Idx = SVN->getMaskElt(i);
       if (i) OS << ",";
-      if (Mask->getOperand(i).getOpcode() == ISD::UNDEF)
+      if (Idx < 0)
         OS << "u";
       else
-        OS << cast<ConstantSDNode>(Mask->getOperand(i))->getZExtValue();
+        OS << Idx;
     }
     OS << ">";
   }
@@ -5611,3 +5717,13 @@ bool BuildVectorSDNode::isConstantSplat(APInt &SplatValue,
   SplatBitSize = sz;
   return true;
 }
+
+bool ShuffleVectorSDNode::isSplatMask(const int *Mask, MVT VT) {
+  int Idx = -1;
+  for (unsigned i = 0, e = VT.getVectorNumElements(); i != e; ++i) {
+    if (Idx < 0) Idx = Mask[i];
+    if (Mask[i] >= 0 && Mask[i] != Idx)
+      return false;
+  }
+  return true;
+}