[PATCH] Allow the RegisterCoalescer to remove copies to reserved registers

[Quentin Colombet]

> Perhaps we should restrict to the case of a reserved physical register?


Reserved registers are a different story and in that case, by all means, this is a good idea :).

> I can certainly try that if you don't like my suggestion above.


I like your suggestion, the copy propagation improvement is just another angle of attack I was envisioning. It may be generally useful, but if we do not have motivating example, I would leave that for later.

Thanks,
-Quentin


http://reviews.llvm.org/D6978

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