Register objects question

[Jared Buttles]

I'm looking to create some rtl statements that reference registers, but 
it is my understanding that registers, as objects, are unique and 
stored in the regno_reg_rtx[] array. If that is the case, then why does 
regno_reg_rtx[] return a different rtl address than that used (as is 
evident when I print the rtl list)? How do I access the register object 
actually being used in the rtl? Am I fundamentally misunderstanding the 
storage of these things?

Jared Buttles
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Research Associate, Cylant Inc.
www.cylant.com