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Ryan Houdek
5472d1cc04
This does a gather load three ways, SVE256, SVE128, and ASIMD. This operation is a bit special since it it can't quite handle all gather loadstores in the 256-bit case and requires the frontend to decompose the operation in the case that the striding hits a mode that SVE doesn't support! The 128-bit case is a lot simpler since both support all the cases where stride doesn't match. I find this to be a nice compromise while there aren't any SVE256 products on the market. In the 128-bit case there is an SVE path which is utilized if the passed in stride supports what SVE understands, otherwise it falls back to an ASIMD implementation which manually emulates everything that is necessary. This instruction is very explicitly doing basically exactly what AVX gather instructions want, because it's complex enough that we don't want to try and make this a generic solution.