| commit | 9a2d4d176ad290eb556f27a990880acad99cc163 | [log] [tgz] |
|---|---|---|
| author | Luke Lau <luke@igalia.com> | Tue Jun 03 12:05:44 2025 +0100 |
| committer | GitHub <noreply@github.com> | Tue Jun 03 12:05:44 2025 +0100 |
| tree | 4d7f2512c56a37535e07ee780e6c8b0203f520e5 | |
| parent | ddfeecf4c588d525bad3a7e19601d714fd708363 [diff] |
[SelectionDAG][AArch64] Legalize power of 2 vector.[de]interleaveN (#141513) After https://github.com/llvm/llvm-project/pull/139893, we now have [de]interleave intrinsics for factors 2-8 inclusive, with the plan to eventually get the loop vectorizer to emit a single intrinsic for these factors instead of recursively deinterleaving (to support scalable non-power-of-2 factors and to remove the complexity in the interleaved access pass). AArch64 currently supports scalable interleaved groups of factors 2 and 4 from the loop vectorizer. For factor 4 this is currently emitted as a series of recursive [de]interleaves, and normally converted to a target intrinsic in the interleaved access pass. However if for some reason the interleaved access pass doesn't catch it, the [de]interleave4 intrinsic will need to be lowered by the backend. This patch legalizes the node and any other power-of-2 factor to smaller factors, so if a target can lower [de]interleave2 it should be able to handle this without crashing. Factor 3 will probably be more complicated to lower so I've left it out for now. We can disable it in the AArch64 cost model when implementing the loop vectorizer changes.
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