[WIP] NumberToString operator in TF.

src/compiler/simplified-lowering.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/simplified-lowering.h"
 
 #include <limits>
 
 #include "src/address-map.h"
 #include "src/base/bits.h"
@@ skipping 2010 matching lines @@
         if (lower()) DeferReplacement(node, node->InputAt(0));
         return;
       }
       case IrOpcode::kNumberToUint32: {
         // Just change representation if necessary.
         VisitUnop(node, UseInfo::TruncatingWord32(),
                   MachineRepresentation::kWord32);
         if (lower()) DeferReplacement(node, node->InputAt(0));
         return;
       }
+      case IrOpcode::kNumberToString: {
+        Type* const rhs_type = TypeOf(node->InputAt(1));
+        VisitBinop(node, UseInfo::AnyTagged(), MachineRepresentation::kTagged);
+        if (lower()) {
+          if (rhs_type->Is(type_cache_.kSingletonTen)) {
+            // NumberToString(x, #10) => Call(NumberToStringStub, x, no-context)
+            Operator::Properties properties = Operator::kEliminatable;
+            Callable callable =
+                CodeFactory::NumberToString(jsgraph_->isolate());
+            CallDescriptor::Flags flags = CallDescriptor::kNoFlags;
+            CallDescriptor* desc = Linkage::GetStubCallDescriptor(
+                jsgraph_->isolate(), jsgraph_->zone(), callable.descriptor(), 0,
+                flags, properties);
+            node->InsertInput(jsgraph_->zone(), 0,
+                              jsgraph_->HeapConstant(callable.code()));
+            node->ReplaceInput(2, jsgraph_->NoContextConstant());
+            node->AppendInput(jsgraph_->zone(), jsgraph_->graph()->start());
+            NodeProperties::ChangeOp(node, jsgraph_->common()->Call(desc));
+          } else {
+            // NumberToString(x, y) => %NumberToString(x, y, no-context)
+            Operator::Properties properties = Operator::kEliminatable;
+            CallDescriptor::Flags flags = CallDescriptor::kNoFlags;
+            Runtime::FunctionId id = Runtime::kNumberToString;
+            CallDescriptor* desc = Linkage::GetRuntimeCallDescriptor(
+                jsgraph_->zone(), id, 2, properties, flags);
+            node->InsertInput(jsgraph_->zone(), 0,
+                              jsgraph_->CEntryStubConstant(1));
+            node->AppendInput(jsgraph_->zone(),
+                              jsgraph_->ExternalConstant(
+                                  ExternalReference(id, jsgraph_->isolate())));
+            node->AppendInput(jsgraph_->zone(), jsgraph_->Int32Constant(2));
+            node->AppendInput(jsgraph_->zone(), jsgraph_->NoContextConstant());
+            node->AppendInput(jsgraph_->zone(), jsgraph_->graph()->start());
+            NodeProperties::ChangeOp(node, jsgraph_->common()->Call(desc));
+          }
+        }
+        return;
+      }
       case IrOpcode::kReferenceEqual: {
         VisitBinop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit);
         if (lower()) {
           NodeProperties::ChangeOp(node, lowering->machine()->WordEqual());
         }
         return;
       }
       case IrOpcode::kStringEqual: {
         VisitBinop(node, UseInfo::AnyTagged(), MachineRepresentation::kTagged);
         if (lower()) {
@@ skipping 1295 matching lines @@
         isolate(), graph()->zone(), callable.descriptor(), 0, flags,
         Operator::kNoProperties);
     to_number_operator_.set(common()->Call(desc));
   }
   return to_number_operator_.get();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8