[PATCH] D149916: [VP][SelectionDAG][RISCV] Add get_vector_length intrinsics and generic SelectionDAG support.

[Simon Moll via Phabricator via llvm-commits]

simoll added a comment.

I suppose this makes sense for ARM MVE/SVE as well?
Generally, we should simplify this in IR for other targets and/or tripcounts with known multiples: otherwise the VP expansion pass will create %evl-to-%mask expansion code not knowing that the `%evl` is ineffective (eg `%evl == vector_length`).


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https://reviews.llvm.org/D149916