Right shift operation not working about nsimd HOT 2 OPEN

Hi NK-Nikunj,

The error you are facing is the expected behavior of NSIMD. Let me give you details: the shr, shl and shra operators work on integer types only (hence the error) and work element-wise. I mean that

v = [1 ; 2 ; 3 ; 4]
v << n == [1 << n ; 2 << n ; 3 << n ; 4 << n]

From what you describe, what you want is a shuffle but we do not have this one yet. Moreover I have questions for you on what you want exactly :

• Do you want this shuffle to work on a 4-elements basis i mean given v = [1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ]:

  shuffle(v, 1) = [ 2 ; 3 ; 4 ; 1 ; 6 ; 7 ; 8 ; 5 ]
  

  or

  shuffle(v, 1) = [ 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ; 1 ]
  

  ?

• Do you want it only a 4-elements SIMD vectors? Do your algorithm have this constraint? Do you want it to be length agnostic?

I am asking you these according to #8, there are two ways to have shuffles length angostic.

from nsimd.

@gquintin I want it to be length agnostic. My apologies, I should've seen this comment before.

from nsimd.