Table lookups - this is pretty definitive

[Peter Alexander]

> Switching to it in Warp produced a very significant speedup on 
> real files.
>
> https://github.com/facebook/warp/pull/5

That's to be expected as warp will call it often and it will stay 
in the cache. For a program that calls it less often the other 
methods may be faster.

Basically, it depends on the use case.

Glad to see it's helped in warp. Any idea how it is comparing to 
clang with this improvement?