When trying to unify the vector_vector_composition variants I noticed that 
there are even more alignment checks than when I last looked ;)

I think we would need to store at least the "punning type" as well as the
element type in ls_data.  The computed alignment_support_scheme as well as
the misalignment are also used for costing later.

Can we defer that "plastic surgery" to later?  I don't think there is anything 
to be gained in terms of legibility if I transplant parts of it into a helper 
function that is called from get_load_store_type.  And I think it would 
increase the scope of the current patch too much.  I can try as a follow up of 
course.

I think the largest remaining problem is the load permutations and how to 
properly filter the ones I have in mind.

Computing the alignment twice can be avoided if we either store a fallback 
vectype (that's how I did it locally) or don't bother with a fallback at all.

Regarding ls.pun_vectype, would you want to get rid of that entirely and 
"replace" vectype?  (Or just in get_load_store_type?)  I thought replacing 
isn't possible as we have done analysis based on the old vectype already.

-- 
Regards
 Robin

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