Philip Reames 25e43334a8
[RISCV] Lower shuffle which splats a single span (without exact VLEN) (#127108)
If we have a shuffle which repeats the same pattern of elements, all of
which come from the first register in the source register group, we can
lower this to a single vrgather at m1 to perform the element
rearrangement, and reuse that for each register in the result vector
register group.
2025-02-14 17:09:27 -08:00
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