Didn't mean ScheduleDAGList.cpp to make the last checkin.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28030 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp

@@ -51,7 +51,6 @@ namespace {
     short NumSuccsLeft;                 // # of succs not scheduled.
     short NumChainPredsLeft;            // # of chain preds not scheduled.
     short NumChainSuccsLeft;            // # of chain succs not scheduled.
-    bool isStore          : 1;          // Is a store.
     bool isTwoAddress     : 1;          // Is a two-address instruction.
     bool isDefNUseOperand : 1;          // Is a def&use operand.
     bool isPending        : 1;          // True once pending.
@@ -64,7 +63,7 @@ namespace {
     
     SUnit(SDNode *node, unsigned nodenum)
       : Node(node), NumPredsLeft(0), NumSuccsLeft(0),
-      NumChainPredsLeft(0), NumChainSuccsLeft(0), isStore(false),
+      NumChainPredsLeft(0), NumChainSuccsLeft(0),
       isTwoAddress(false), isDefNUseOperand(false),
       isPending(false), isAvailable(false), isScheduled(false), 
       Latency(0), CycleBound(0), Cycle(0), NodeNum(nodenum) {}
@@ -316,13 +315,9 @@ void ScheduleDAGList::BuildSchedUnits() {
     SUnit *SU = &SUnits[su];
     SDNode *MainNode = SU->Node;
     
-    if (MainNode->isTargetOpcode()) {
+    if (MainNode->isTargetOpcode() &&
-      unsigned Opc = MainNode->getTargetOpcode();
+        TII->isTwoAddrInstr(MainNode->getTargetOpcode()))
-      if (TII->isTwoAddrInstr(Opc))
+      SU->isTwoAddress = true;
-        SU->isTwoAddress = true;
-      if (TII->isStore(Opc))
-        SU->isStore = true;
-    }
     
     // Find all predecessors and successors of the group.
     // Temporarily add N to make code simpler.
@@ -363,9 +358,9 @@ void ScheduleDAGList::BuildSchedUnits() {
     SU->FlaggedNodes.pop_back();
   }
   
+  return;
   DEBUG(for (unsigned su = 0, e = SUnits.size(); su != e; ++su)
         SUnits[su].dumpAll(&DAG));
-  return;
 }
 
 /// EmitSchedule - Emit the machine code in scheduled order.
@@ -740,7 +735,7 @@ namespace {
     const std::vector<SUnit> *SUnits;
     
     // SethiUllmanNumbers - The SethiUllman number for each node.
-    std::vector<unsigned> SethiUllmanNumbers;
+    std::vector<int> SethiUllmanNumbers;
     
     std::priority_queue<SUnit*, std::vector<SUnit*>, ls_rr_sort> Queue;
   public:
@@ -779,7 +774,7 @@ namespace {
     }
   private:
     void CalculatePriorities();
-    unsigned CalcNodePriority(const SUnit *SU);
+    int CalcNodePriority(const SUnit *SU);
   };
 }
 
@@ -789,7 +784,7 @@ bool ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const {
   
   int LBonus = (int)left ->isDefNUseOperand;
   int RBonus = (int)right->isDefNUseOperand;
-
+  
   // Special tie breaker: if two nodes share a operand, the one that
   // use it as a def&use operand is preferred.
   if (left->isTwoAddress && !right->isTwoAddress) {
@@ -803,20 +798,6 @@ bool ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const {
       RBonus++;
   }
   
-  // Push stores up as much as possible. This really help code like this:
-  //   load
-  //   compute
-  //   store
-  //   load
-  //   compute
-  //   store
-  // This would make sure the scheduled code completed all computations and
-  // the stores before the next series of computation starts.
-  if (!left->isStore && right->isStore)
-    LBonus += 2;
-  if (left->isStore && !right->isStore)
-    RBonus += 2;
-
   // Priority1 is just the number of live range genned.
   int LPriority1 = left ->NumPredsLeft - LBonus;
   int RPriority1 = right->NumPredsLeft - RBonus;
@@ -838,9 +819,9 @@ bool ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const {
 
 /// CalcNodePriority - Priority is the Sethi Ullman number. 
 /// Smaller number is the higher priority.
-unsigned RegReductionPriorityQueue::CalcNodePriority(const SUnit *SU) {
+int RegReductionPriorityQueue::CalcNodePriority(const SUnit *SU) {
-  unsigned &SethiUllmanNumber = SethiUllmanNumbers[SU->NodeNum];
+  int &SethiUllmanNumber = SethiUllmanNumbers[SU->NodeNum];
-  if (SethiUllmanNumber != 0)
+  if (SethiUllmanNumber != INT_MIN)
     return SethiUllmanNumber;
   
   if (SU->Preds.size() == 0) {
@@ -851,7 +832,7 @@ unsigned RegReductionPriorityQueue::CalcNodePriority(const SUnit *SU) {
          I = SU->Preds.begin(), E = SU->Preds.end(); I != E; ++I) {
       if (I->second) continue;  // ignore chain preds.
       SUnit *PredSU = I->first;
-      unsigned PredSethiUllman = CalcNodePriority(PredSU);
+      int PredSethiUllman = CalcNodePriority(PredSU);
       if (PredSethiUllman > SethiUllmanNumber) {
         SethiUllmanNumber = PredSethiUllman;
         Extra = 0;
@@ -859,7 +840,10 @@ unsigned RegReductionPriorityQueue::CalcNodePriority(const SUnit *SU) {
         Extra++;
     }
     
-    SethiUllmanNumber += Extra;
+    if (SU->Node->getOpcode() != ISD::TokenFactor)
+      SethiUllmanNumber += Extra;
+    else
+      SethiUllmanNumber = (Extra == 1) ? 0 : Extra-1;
   }
   
   return SethiUllmanNumber;
@@ -867,7 +851,7 @@ unsigned RegReductionPriorityQueue::CalcNodePriority(const SUnit *SU) {
 
 /// CalculatePriorities - Calculate priorities of all scheduling units.
 void RegReductionPriorityQueue::CalculatePriorities() {
-  SethiUllmanNumbers.assign(SUnits->size(), 0);
+  SethiUllmanNumbers.assign(SUnits->size(), INT_MIN);
   
   for (unsigned i = 0, e = SUnits->size(); i != e; ++i)
     CalcNodePriority(&(*SUnits)[i]);