[vector] vector shift operations

[Adam Pocock]

I'm implementing Csuros approximate counters 
(https://arxiv.org/abs/0904.3062) which have a data dependent shift in 
them to recover the int value from the stored byte. I'd like to be able 
to recover n ints from an array of n bytes using the Vector API, but 
that requires left shifting each element of a vector of n ints by a data 
dependent value from the vector of n bytes (encoded as ints for simplicity).

It looks like there is an instruction in AVX2 which does this from the 
vpslld family 
(https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=epi&techs=AVX2&cats=Shift&expand=4871). 
Is there a roadmap somewhere for how much coverage the Vector API will 
have over the wide space of intrinsics? Should we expect the API to grow 
over time, or are the current operations the only ones which are 
expected to be supported?

Thanks,

Adam

-- 
Adam Pocock
Principal Member of Technical Staff
Machine Learning Research Group
Oracle Labs, Burlington, MA