RFC: Enable vectorization of call instructions in the loop vectorizer

[Renato Golin]

On 16 December 2013 22:02, Hal Finkel <hfinkel at anl.gov> wrote:

> I think we're okay here for the time being ;) -- Arnold suggested that we
> use some large value to represent the cost of the scalar function. The
> metadata (or whatever) just need to specify some multiplicative factor by
> which we scale that cost. In general, I think that should be fairly easy to
> determine.
>

Yes, the question was more rhetorical than anything else. I think the
standard cost of "call / width" is a good one, and domain-specific
decisions can be taken in the call-backs.

cheers,
--renato
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