GHC.Prim contains a good couple of vectorised instructions, which can be used by libraries for generating nice fast e.g. sums of floating-point vectors.

However, several instructions that modern processors could vectorise are missing there. In particular, I would like to be able to use the VPSLLVD...VPSRAVD shifting operations, and at some point perhaps VPMAXSQ...VPMINUQ maximum/minimum operations.

It would be great if corresponding primops could be added. Else I would like to know – where is this stuff even defined? GHC.Prim as such seems to be merely an automatically-generated dummy module, mostly for Haddock.

(On the other hand, I find it also a bit strange that there are primops for integer division, which is apparently not supported by SSE/AVX at all!)