[llvm-dev] TypeExpandInteger for vectors?

[Sean Silva via llvm-dev]

It looks like in various places in SelectionDAG and related machinery we
appear to implicitly or explicitly assume that TypeExpandInteger only
applies to scalars.

Does anybody know why that is?

For our target (Pixel Visual Core:
https://www.blog.google/products/pixel/pixel-visual-core-image-processing-and-machine-learning-pixel-2/)
expanding a N-bit vector op into two (N/2)-bit vector ops is a natural way
to legalize some of our vector operations, but we're finding that we need
to modify a bunch of random places in the code to make it work. I'm curious
if there is a cleaner way, or some big picture thing I'm missing.

Thanks,

-- Sean Silva
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