Initial real implementation of simple merge for frames. Does not yet...

src/codegen-ia32.cc

 // Copyright 2006-2008 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 229 matching lines @@
       ProcessDeclarations(scope_->declarations());
       // Bail out if a stack-overflow exception occurred when processing
       // declarations.
       if (HasStackOverflow()) return;
     }
 
     if (FLAG_trace) {
       frame_->CallRuntime(Runtime::kTraceEnter, 0);
       // Ignore the return value.
     }
-    frame_->SpillAll();
     CheckStack();
 
     // Compile the body of the function in a vanilla state. Don't
     // bother compiling all the code if the scope has an illegal
     // redeclaration.
     if (!scope_->HasIllegalRedeclaration()) {
       Comment cmnt(masm_, "[ function body");
 #ifdef DEBUG
       bool is_builtin = Bootstrapper::IsActive();
       bool should_trace =
@@ skipping 5227 matching lines @@
 
   // Slow-case: Go through the JavaScript implementation.
   __ bind(&slow);
   __ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal