[llvm-dev] XMMs unused

[Dangeti Tharun kumar via llvm-dev]

On Fri, Nov 2, 2018 at 3:31 PM Anton Korobeynikov <anton at korobeynikov.info>
wrote:

> > Yes, I am compiling for linux system.
> > So the RA will not consider assigning a scratch register to a live range
> crossing function call, though it may reduce spills?
> Well, it has to spill the register – otherwise it could be clobbered by a
> call.

May be, I haven't conveyed it properly. What I mean was, does the RA make
an analysis of spills incurred by *using a scratch register and
spilled/restored across the call site* and *by not using the scratch
register at all *?

>
> --
> With best regards, Anton Korobeynikov
> Department of Statistical Modelling, Saint Petersburg State University
>


-- 
Regards,
DTharun
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