Switch the operandlist/valuelist from being vectors to being just an array.This saves 12 bytes from SDNode, but doesn't speed things up substantially

(our graphs apparently already fit within the cache on my g5).  In any case
this reduces memory usage.

llvm-svn: 24249

1 files changed, 33 insertions, 23 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index c1cd169b248..753364ecb3c 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -214,15 +214,17 @@ void SelectionDAG::DestroyDeadNode(SDNode *N) {
   
   // Next, brutally remove the operand list.  This is safe to do, as there are
   // no cycles in the graph.
-  while (!N->Operands.empty()) {
-    SDNode *O = N->Operands.back().Val;
-    N->Operands.pop_back();
+  for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) {
+    SDNode *O = I->Val;
     O->removeUser(N);
     
     // Now that we removed this operand, see if there are no uses of it left.
     if (O->use_empty())
       DestroyDeadNode(O);
   }
+  delete[] N->OperandList;
+  N->OperandList = 0;
+  N->NumOperands = 0;
 
   // Mark the node as dead.
   N->MorphNodeTo(65535);
@@ -253,11 +255,11 @@ void SelectionDAG::DeleteNodeNotInCSEMaps(SDNode *N) {
   }
     
   // Drop all of the operands and decrement used nodes use counts.
-  while (!N->Operands.empty()) {
-    SDNode *O = N->Operands.back().Val;
-    N->Operands.pop_back();
-    O->removeUser(N);
-  }
+  for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I)
+    I->Val->removeUser(N);
+  delete[] N->OperandList;
+  N->OperandList = 0;
+  N->NumOperands = 0;
   
   delete N;
 }
@@ -430,8 +432,13 @@ SDNode *SelectionDAG::AddNonLeafNodeToCSEMaps(SDNode *N) {
 
 
 SelectionDAG::~SelectionDAG() {
-  for (unsigned i = 0, e = AllNodes.size(); i != e; ++i)
-    delete AllNodes[i];
+  for (unsigned i = 0, e = AllNodes.size(); i != e; ++i) {
+    SDNode *N = AllNodes[i];
+    delete [] N->OperandList;
+    N->OperandList = 0;
+    N->NumOperands = 0;
+    delete N;
+  }
 }
 
 SDOperand SelectionDAG::getZeroExtendInReg(SDOperand Op, MVT::ValueType VT) {
@@ -1078,9 +1085,9 @@ void SDNode::setAdjCallChain(SDOperand N) {
   assert((getOpcode() == ISD::CALLSEQ_START ||
           getOpcode() == ISD::CALLSEQ_END) && "Cannot adjust this node!");
 
-  Operands[0].Val->removeUser(this);
-  Operands[0] = N;
-  N.Val->Uses.push_back(this);
+  OperandList[0].Val->removeUser(this);
+  OperandList[0] = N;
+  OperandList[0].Val->Uses.push_back(this);
 }
 
 
@@ -1430,10 +1437,11 @@ void SelectionDAG::ReplaceAllUsesWith(SDOperand FromN, SDOperand ToN,
     // This node is about to morph, remove its old self from the CSE maps.
     RemoveNodeFromCSEMaps(U);
     
-    for (unsigned i = 0, e = U->getNumOperands(); i != e; ++i)
-      if (U->getOperand(i).Val == From) {
+    for (SDOperand *I = U->OperandList, *E = U->OperandList+U->NumOperands;
+         I != E; ++I)
+      if (I->Val == From) {
         From->removeUser(U);
-        U->Operands[i].Val = To;
+        I->Val = To;
         To->addUser(U);
       }
 
@@ -1471,10 +1479,11 @@ void SelectionDAG::ReplaceAllUsesWith(SDNode *From, SDNode *To,
     // This node is about to morph, remove its old self from the CSE maps.
     RemoveNodeFromCSEMaps(U);
     
-    for (unsigned i = 0, e = U->getNumOperands(); i != e; ++i)
-      if (U->getOperand(i).Val == From) {
+    for (SDOperand *I = U->OperandList, *E = U->OperandList+U->NumOperands;
+         I != E; ++I)
+      if (I->Val == From) {
         From->removeUser(U);
-        U->Operands[i].Val = To;
+        I->Val = To;
         To->addUser(U);
       }
         
@@ -1512,11 +1521,12 @@ void SelectionDAG::ReplaceAllUsesWith(SDNode *From,
     // This node is about to morph, remove its old self from the CSE maps.
     RemoveNodeFromCSEMaps(U);
     
-    for (unsigned i = 0, e = U->getNumOperands(); i != e; ++i)
-      if (U->getOperand(i).Val == From) {
-        const SDOperand &ToOp = To[U->getOperand(i).ResNo];
+    for (SDOperand *I = U->OperandList, *E = U->OperandList+U->NumOperands;
+         I != E; ++I)
+      if (I->Val == From) {
+        const SDOperand &ToOp = To[I->ResNo];
         From->removeUser(U);
-        U->Operands[i] = ToOp;
+        *I = ToOp;
         ToOp.Val->addUser(U);
       }