[Sheriff] Revert "Check elimination temporarily disabled.", "Fix for buildbot failure after r19102.…

src/hydrogen-check-elimination.cc

Index: src/hydrogen-check-elimination.cc
diff --git a/src/hydrogen-check-elimination.cc b/src/hydrogen-check-elimination.cc
index e393234067095408e1a68bb107212f9ef90903e9..e12f14a13fb16b740fe6f4327970c5d77f7edca2 100644
--- a/src/hydrogen-check-elimination.cc
+++ b/src/hydrogen-check-elimination.cc
@@ -48,12 +48,12 @@ typedef UniqueSet<Map>* MapSet;
 
 struct HCheckTableEntry {
   HValue* object_;  // The object being approximated. NULL => invalid entry.
-  HInstruction* check_;  // The last check instruction.
-  MapSet maps_;          // The set of known maps for the object.
+  HValue* check_;   // The last check instruction.
+  MapSet maps_;     // The set of known maps for the object.
 };
 
 
-// The main data structure used during check elimination, which stores a
+// The main datastructure used during check elimination, which stores a
 // set of known maps for each object.
 class HCheckTable : public ZoneObject {
  public:
@@ -130,23 +130,6 @@ class HCheckTable : public ZoneObject {
     copy->cursor_ = cursor_;
     copy->size_ = size_;
 
-    // Create entries for succ block's phis.
-    if (succ->phis()->length() > 0) {
-      int pred_index = succ->PredecessorIndexOf(from_block);
-      for (int phi_index = 0;
-           phi_index < succ->phis()->length();
-           ++phi_index) {
-        HPhi* phi = succ->phis()->at(phi_index);
-        HValue* phi_operand = phi->OperandAt(pred_index);
-
-        HCheckTableEntry* pred_entry = copy->Find(phi_operand);
-        if (pred_entry != NULL) {
-          // Create an entry for a phi in the table.
-          copy->Insert(phi, NULL, pred_entry->maps_->Copy(phase_->zone()));
-        }
-      }
-    }
-
     // Branch-sensitive analysis for certain comparisons may add more facts
     // to the state for the successor on the true branch.
     bool learned = false;
@@ -202,28 +185,17 @@ class HCheckTable : public ZoneObject {
 
   // Global analysis: Merge this state with the other incoming state.
   HCheckTable* Merge(HBasicBlock* succ, HCheckTable* that,
-                     HBasicBlock* pred_block, Zone* zone) {
-    if (pred_block->IsReachable()) {
+                     HBasicBlock* that_block, Zone* zone) {
+    if (that_block->IsReachable()) {
       if (that->size_ == 0) {
         // If the other state is empty, simply reset.
         size_ = 0;
         cursor_ = 0;
       } else {
-        int pred_index = succ->PredecessorIndexOf(pred_block);
         bool compact = false;
         for (int i = 0; i < size_; i++) {
           HCheckTableEntry* this_entry = &entries_[i];
-          HCheckTableEntry* that_entry;
-          if (this_entry->object_->IsPhi() &&
-              this_entry->object_->block() == succ) {
-            HPhi* phi = HPhi::cast(this_entry->object_);
-            HValue* phi_operand = phi->OperandAt(pred_index);
-            that_entry = that->Find(phi_operand);
-
-          } else {
-            that_entry = that->Find(this_entry->object_);
-          }
-
+          HCheckTableEntry* that_entry = that->Find(this_entry->object_);
           if (that_entry == NULL) {
             this_entry->object_ = NULL;
             compact = true;
@@ -241,7 +213,7 @@ class HCheckTable : public ZoneObject {
     }
     if (FLAG_trace_check_elimination) {
       PrintF("B%d checkmaps-table merged with B%d table:\n",
-             succ->block_id(), pred_block->block_id());
+             succ->block_id(), that_block->block_id());
       Print();
     }
     return this;
@@ -272,43 +244,14 @@ class HCheckTable : public ZoneObject {
         }
         return;
       }
-      MapSet intersection = i->Intersect(a, phase_->zone());
-      if (intersection->size() == 0) {
+      i = i->Intersect(a, phase_->zone());
+      if (i->size() == 0) {
         // Intersection is empty; probably megamorphic, which is likely to
         // deopt anyway, so just leave things as they are.
         INC_STAT(empty_);
       } else {
-        // Update set of maps in the entry.
-        entry->maps_ = intersection;
-        if (intersection->size() != i->size()) {
-          // Narrow set of maps in the second check maps instruction.
-          HGraph* graph = instr->block()->graph();
-          HCheckMaps* new_check_maps =
-              HCheckMaps::New(graph->zone(), NULL, instr->value(),
-                              intersection, instr->typecheck(),
-                              instr->has_migration_target());
-          if (entry->check_ != NULL &&
-              entry->check_->block() == instr->block()) {
-            // There is a check in the same block so replace it with a more
-            // strict check and eliminate the second check entirely.
-            new_check_maps->InsertBefore(entry->check_);
-            entry->check_->DeleteAndReplaceWith(new_check_maps);
-            TRACE(("Check #%d narrowed to #%d\n",
-                entry->check_->id(), new_check_maps->id()));
-
-          } else {
-            new_check_maps->InsertBefore(instr);
-          }
-          TRACE(("CheckMaps #%d for #%d narrowed to #%d:\n",
-              instr->id(), instr->value()->id(), new_check_maps->id()));
-          instr->DeleteAndReplaceWith(new_check_maps);
-          entry->check_ = new_check_maps;
-
-          if (FLAG_trace_check_elimination) {
-            Print();
-          }
-          INC_STAT(narrowed_);
-        }
+        // TODO(titzer): replace the first check with a more strict check
+        INC_STAT(narrowed_);
       }
     } else {
       // No entry; insert a new one.
@@ -483,9 +426,7 @@ class HCheckTable : public ZoneObject {
     for (int i = 0; i < size_; i++) {
       HCheckTableEntry* entry = &entries_[i];
       ASSERT(entry->object_ != NULL);
-      PrintF("  checkmaps-table @%d: %s #%d ", i,
-             entry->object_->IsPhi() ? "phi" : "object",
-             entry->object_->id());
+      PrintF("  checkmaps-table @%d: object #%d ", i, entry->object_->id());
       if (entry->check_ != NULL) {
         PrintF("check #%d ", entry->check_->id());
       }