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Of course, but I'd check for the class equality first, because it's faster (yeah, i know you turned off inlining of #class, but Cog doesn't care about that ;)).
Are you sure Cog doesn't care? I think it does. From what I can see in Cog code the entry point to inline #class is from the bytecoodes. If you see
initializeBytecodeTableForClosureV3
...
#(1 199 199 genSpecialSelectorClass needsFrameNever: notMapped 0). "not mapped because it is directly inlined (for now)"
...
so if you use a the normal bytecode for #class then I think #class is not inlined in machine code. At least from my tests I noticed that.
Cheers
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Another thing that you should add (besides tests of course) is SmallInteger >> #pointsTo: which should return false. Also make sure that pointer tracing tools use #pointsTo:. In Squeak I found that some of them "reinvented" this method...
Levente