Re-enable using push instructions for syncing the virtual frame....

src/ia32/codegen-ia32.cc

 // Copyright 2006-2009 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 3918 matching lines @@
   }
 }
 
 
 void CodeGenerator::VisitLiteral(Literal* node) {
   Comment cmnt(masm_, "[ Literal");
   frame_->Push(node->handle());
 }
 
 
-void CodeGenerator::LoadUnsafeSmi(Register target, Handle<Object> value) {
+void CodeGenerator::PushUnsafeSmi(Handle<Object> value) {
+  ASSERT(value->IsSmi());
+  int bits = reinterpret_cast<int>(*value);
+  __ push(Immediate(bits & 0x0000FFFF));
+  __ or_(Operand(esp, 0), Immediate(bits & 0xFFFF0000));
+}
+
+
+void CodeGenerator::StoreUnsafeSmiToLocal(int offset, Handle<Object> value) {
+  ASSERT(value->IsSmi());
+  int bits = reinterpret_cast<int>(*value);
+  __ mov(Operand(ebp, offset), Immediate(bits & 0x0000FFFF));
+  __ or_(Operand(ebp, offset), Immediate(bits & 0xFFFF0000));
+}
+
+
+void CodeGenerator::MoveUnsafeSmi(Register target, Handle<Object> value) {
   ASSERT(target.is_valid());
   ASSERT(value->IsSmi());
   int bits = reinterpret_cast<int>(*value);
   __ Set(target, Immediate(bits & 0x0000FFFF));
-  __ xor_(target, bits & 0xFFFF0000);
+  __ or_(target, bits & 0xFFFF0000);
 }
 
 
 bool CodeGenerator::IsUnsafeSmi(Handle<Object> value) {
   if (!value->IsSmi()) return false;
   int int_value = Smi::cast(*value)->value();
   return !is_intn(int_value, kMaxSmiInlinedBits);
 }
 
 
@@ skipping 4152 matching lines @@
 
 int CompareStub::MinorKey() {
   // Encode the two parameters in a unique 16 bit value.
   ASSERT(static_cast<unsigned>(cc_) < (1 << 15));
   return (static_cast<unsigned>(cc_) << 1) | (strict_ ? 1 : 0);
 }
 
 #undef __
 
 } }  // namespace v8::internal