simd branch ready for review

[Johan Tibell]

On Mon, Feb 4, 2013 at 2:09 PM, Geoffrey Mainland <mainland at apeiron.net>wrote:

> I'd like to figure out how to properly support having the set of
> available primops depend on the dynamic flags before adding too much
> more. I'll be speaking to Simon PJ about it tomorrow.


Could we use a fallback, like we did for e.g. popcount? I don't think have
conditionally defined primops is a good idea. How would you use them in
programs? You'd have to do something like:

#ifdef ???
-- use primops
#else
-- use fallback
#endif

and everyone would write their own fallback. It would be better if GHC fell
back to some generic implementation.

-- Johan
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