Improve handling of unary plus.

src/hydrogen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 9142 matching lines @@
 
 
 void HOptimizedGraphBuilder::VisitUnaryOperation(UnaryOperation* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   switch (expr->op()) {
     case Token::DELETE: return VisitDelete(expr);
     case Token::VOID: return VisitVoid(expr);
     case Token::TYPEOF: return VisitTypeof(expr);
-    case Token::ADD: return VisitAdd(expr);
     case Token::SUB: return VisitSub(expr);
     case Token::BIT_NOT: return VisitBitNot(expr);
     case Token::NOT: return VisitNot(expr);
     default: UNREACHABLE();
   }
 }
 
 void HOptimizedGraphBuilder::VisitDelete(UnaryOperation* expr) {
   Property* prop = expr->expression()->AsProperty();
   VariableProxy* proxy = expr->expression()->AsVariableProxy();
@@ skipping 37 matching lines @@
 
 void HOptimizedGraphBuilder::VisitTypeof(UnaryOperation* expr) {
   CHECK_ALIVE(VisitForTypeOf(expr->expression()));
   HValue* value = Pop();
   HValue* context = environment()->LookupContext();
   HInstruction* instr = new(zone()) HTypeof(context, value);
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
-void HOptimizedGraphBuilder::VisitAdd(UnaryOperation* expr) {
-  CHECK_ALIVE(VisitForValue(expr->expression()));
-  HValue* value = Pop();
-  HValue* context = environment()->LookupContext();
-  HInstruction* instr =
-      HMul::New(zone(), context, value, graph()->GetConstant1());
-  if (instr->IsBinaryOperation()) {
-    // Since we don't have type feedback, we must be cautious/pessimistic.
-    HBinaryOperation::cast(instr)->set_observed_input_representation(
-        Representation::Tagged(), Representation::Tagged());
-  }
-  return ast_context()->ReturnInstruction(instr, expr->id());
-}
-
-
 void HOptimizedGraphBuilder::VisitSub(UnaryOperation* expr) {
   CHECK_ALIVE(VisitForValue(expr->expression()));
   HValue* value = Pop();
   HValue* context = environment()->LookupContext();
   HInstruction* instr =
       HMul::New(zone(), context, value, graph()->GetConstantMinus1());
   TypeInfo info = oracle()->UnaryType(expr);
   Representation rep = ToRepresentation(info);
   if (info.IsUninitialized()) {
     AddSoftDeoptimize();
@@ skipping 2445 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal