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[AArch64] Add patterns for constructive splice. #113912
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This change (regression?) looks strange. Not necessarily blocking this but do you know why we see a difference here between SVE2 and SME?
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Thanks for pointing out; that's due to changing the RUN line from +sve to +sve2, not the code change for splice.
It seems the lowering of shufflevector goes through the generic expansion code for +sve (which ends up resulting in the relatively neat zips), but chooses to use the TBL when it is available (i.e. with +sve2), which unfortunately doesn't end up being as nice.
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Ok, can be a follow up fix then.