Optimize %IsConstructCall() on IA-32.

src/x64/codegen-x64.cc

 // Copyright 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 3311 matching lines @@
   __ testl(value.reg(), Immediate(kSmiTagMask));
   destination()->false_target()->Branch(equal);
   // It is a heap object - get map.
   // Check if the object is a JS array or not.
   __ CmpObjectType(value.reg(), JS_ARRAY_TYPE, kScratchRegister);
   value.Unuse();
   destination()->Split(equal);
 }
 
 
+void CodeGenerator::GenerateIsConstructCall(ZoneList<Expression*>* args) {
+  ASSERT(args->length() == 0);
+  Result answer = frame_->CallRuntime(Runtime::kIsConstructCall, 0);

[Mads Ager (chromium), 2009/06/29 08:12:26]

Maybe add a TODO here and also on ARM so we remember to optimize on those
platforms as well?

+  frame_->Push(&answer);
+}
+
+
 void CodeGenerator::GenerateArgumentsLength(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 0);
   // ArgumentsAccessStub takes the parameter count as an input argument
   // in register eax.  Create a constant result for it.
   Result count(Handle<Smi>(Smi::FromInt(scope_->num_parameters())));
   // Call the shared stub to get to the arguments.length.
   ArgumentsAccessStub stub(ArgumentsAccessStub::READ_LENGTH);
   Result result = frame_->CallStub(&stub, &count);
   frame_->Push(&result);
 }
@@ skipping 3411 matching lines @@
       break;
     default:
       UNREACHABLE();
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal