| commit | 7ef77eb9984d1fb537a409cf4be89560fbb681fe | [log] [tgz] |
|---|---|---|
| author | Luke Lau <luke@igalia.com> | Thu Jun 12 11:09:09 2025 +0100 |
| committer | GitHub <noreply@github.com> | Thu Jun 12 11:09:09 2025 +0100 |
| tree | 40f124347a3b2e11fddf20da07bbd4c543c17012 | |
| parent | 5987f1ee5cc59a05961156c04010ab0f3c857628 [diff] |
[LV] Support scalable interleave groups for factors 3,5,6 and 7 (#141865) Currently the loop vectorizer can only vectorize interleave groups for power-of-2 factors at scalable VFs by recursively interleaving [de]interleave2 intrinsics. However after https://github.com/llvm/llvm-project/pull/124825 and #139893, we now have [de]interleave intrinsics for all factors up to 8, which is enough to support all types of segmented loads and stores on RISC-V. Now that the interleaved access pass has been taught to lower these in #139373 and #141512, this patch teaches the loop vectorizer to emit these intrinsics for factors up to 8, which enables scalable vectorization for non-power-of-2 factors. As far as I'm aware, no in-tree target will vectorize a scalable interelave group above factor 8 because the maximum interleave factor is capped at 4 on AArch64 and 8 on RISC-V, and the `-max-interleave-group-factor` CLI option defaults to 8, so the recursive [de]interleaving code has been removed for now. Factors of 3 with scalable VFs are also turned off in AArch64 since there's no lowering for [de]interleave3 just yet either.
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