On 10/25/2016 8:23 PM, Larry Evans wrote:
At the very least support for the basic SSE 16 byte alignment of subarrays is crucial.
My best idea so far is some magic wrapper type that gets special treatment. Like: using data_t = soa_block< float3, soa_align
, bool >; Something like:
template
struct alignas(Alignment) soa_align { T data; }; Have you tried that yet. If not, I might try.
The issue is you don't want to overalign all elements of the array, just the first element. I have a working solution (using Peter Dimov's mp11 library as I'm not well-versed in post cpp03 metaprogramming). I'm just trying to play around with implementation ideas at the moment. Basically it'd be a nice to store only a single pointer and cheap constant time member sub-array access. But with alignment concerns all I've managed so far are two implementations. 1. 1 pointer with linear time member array access 2. n-pointers with constant time member array access I feel like there should exist implementation that trades a bit of dynamic allocation size for a single pointer and constant time member array access.