[LLVMdev] how to declare that two registers must be different

Chris Lattner sabre at nondot.org
Mon Sep 18 10:30:46 PDT 2006

On Mon, 18 Sep 2006, Vladimir Prus wrote:
>> Restrictions of the form cannot be register Rx can be solved by
>> creating a register class without Rx. The problem is the "must not be
>> the same" restriction.
> Is it allowed now to have overlapping register classes? It was not 
> allowed last time I tried (admittedly long ago).

They are allowed, but don't work particularly well.  It's also on the todo 
list. :)

- Volodya

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