[turbofan] map vregs early

src/compiler/instruction.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/instruction.h"
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/generic-node-inl.h"
 
 namespace v8 {
@@ skipping 298 matching lines @@
       return os << static_cast<const void*>(
                        constant.ToExternalReference().address());
     case Constant::kHeapObject:
       return os << Brief(*constant.ToHeapObject());
   }
   UNREACHABLE();
   return os;
 }
 
 
+InstructionSequence::InstructionSequence(Linkage* linkage, Graph* graph,
+                                         Schedule* schedule)
+    : graph_(graph),
+      node_map_(zone()->NewArray<int>(graph->NodeCount())),
+      linkage_(linkage),
+      schedule_(schedule),
+      constants_(ConstantMap::key_compare(),
+                 ConstantMap::allocator_type(zone())),
+      immediates_(zone()),
+      instructions_(zone()),
+      next_virtual_register_(0),
+      pointer_maps_(zone()),
+      doubles_(std::less<int>(), VirtualRegisterSet::allocator_type(zone())),
+      references_(std::less<int>(), VirtualRegisterSet::allocator_type(zone())),
+      deoptimization_entries_(zone()) {
+  for (int i = 0; i < graph->NodeCount(); ++i) {
+    node_map_[i] = -1;
+  }
+}
+
+
+int InstructionSequence::GetVirtualRegister(const Node* node) {
+  if (node_map_[node->id()] == -1) {
+    node_map_[node->id()] = NextVirtualRegister();
+  }
+  return node_map_[node->id()];
+}
+
+
 Label* InstructionSequence::GetLabel(BasicBlock* block) {
   return GetBlockStart(block)->label();
 }
 
 
 BlockStartInstruction* InstructionSequence::GetBlockStart(BasicBlock* block) {
   return BlockStartInstruction::cast(InstructionAt(block->code_start()));
 }
 
 
@@ skipping 147 matching lines @@
       os << " B" << (*iter)->id();
     }
     os << "\n";
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8