ahatanak added a comment.

In http://reviews.llvm.org/D11319#208367, @echristo wrote:

> Question:
>
> Would it be better to just use reserve=NUM and parse that rather than the 
> single +/- per register? Or is it just not worth it here?


I guess it could be useful for debugging or testing code-gen passes (for 
example, register allocator).

AArch64 has a similar option "aarch64-reserve-x18". Are there other targets or 
use cases that require reserving registers?


http://reviews.llvm.org/D11319




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