Start using the overwrite mode from the full codegens to generate...

src/ast.cc

 // Copyright 2010 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 221 matching lines @@
   return false;
 }
 
 
 void Expression::CopyAnalysisResultsFrom(Expression* other) {
   bitfields_ = other->bitfields_;
   type_ = other->type_;
 }
 
 
+bool UnaryOperation::ResultOverwriteAllowed() {
+  switch (op_) {
+    case Token::BIT_NOT:
+    case Token::SUB:
+      return true;
+    default:
+      return false;
+  }
+}
+
+
+bool BinaryOperation::ResultOverwriteAllowed() {
+  switch (op_) {
+    case Token::COMMA:
+    case Token::OR:
+    case Token::AND:
+      return false;
+    case Token::BIT_OR:
+    case Token::BIT_XOR:
+    case Token::BIT_AND:
+    case Token::SHL:
+    case Token::SAR:
+    case Token::SHR:
+    case Token::ADD:
+    case Token::SUB:
+    case Token::MUL:
+    case Token::DIV:
+    case Token::MOD:
+      return true;
+    default:
+      UNREACHABLE();
+  }
+  return false;
+}
+
+
 BinaryOperation::BinaryOperation(Assignment* assignment) {
   ASSERT(assignment->is_compound());
   op_ = assignment->binary_op();
   left_ = assignment->target();
   right_ = assignment->value();
   pos_ = assignment->position();
   CopyAnalysisResultsFrom(assignment);
 }
 
 
@@ skipping 341 matching lines @@
       cond_(NULL),
       may_have_function_literal_(true) {
 }
 
 
 CaseClause::CaseClause(Expression* label, ZoneList<Statement*>* statements)
     : label_(label), statements_(statements) {
 }
 
 } }  // namespace v8::internal