[PATCH] D126771: [fastalloc] Support allocate specific register class in fastalloc.

[Xiang Zhang via Phabricator via llvm-commits]

xiangzhangllvm added a comment.

I think the idea of "split" special registers RA pass is good (especially for the registers who need to be config).
I notice all the "isVirtual<Register>" places need carefully to "exclude" the special registers.
Seems we may no need to do it if we can make sure that we handle these special registers **before **normal fast RA.
(because they have be allocated to physic registers)


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