> > You can use the FFI for all these operations, just import the C
> > versions. You can even use unboxed types if you really
> want (mostly it
> > shouldn't be necessary, though).
>
> Ah, yes, that works too :). I only suggested it because all the other
> Float# functions seem to be exactly what is found in the
> RealFloat class and these were "missing"...foreign works too, though.
I think it's just this way due to hysterical raisins.
There are few reasons to make something into a primitive instead of a
foreign call; the main one is that you get constant folding. Another
reason is if it can be implemented inline by both the C code generator
and the native code generator. Neither of these seem particularly
important for asinhDouble# and friends, but there are existing primops
you could make the same argument for.
> Out of curiousity, why would I get better performance when using:
>
> data Log = Log Float#
>
> instead of
>
> newtype Log = Log Float
>
> ? GHC should be removing the newtype constructor anyway, so I don't
> understand the difference.
There shouldn't be any difference, as far as I can tell. The two types
have the same representation. But strange things do happen. If you
have an example where it makes a difference, we can take a look.
Cheers,
Simon
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