[PATCH] D103144: [X86][Costmodel] Load/store v2i16 VF=2 interleaving costs

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

And one more example: store VF16 stride 6:

- haswell `48` https://godbolt.org/z/jfb1rss8E
- broadwell `48` https://godbolt.org/z/v73sTPrax
- skylake `48` `https://godbolt.org/z/fn8Y9334x`
- zen1 `20` https://godbolt.org/z/rnTvzYnTr (we seem to round 0.5 down?)
- zen2 `20` https://godbolt.org/z/effcqPfaP (we seem to round 0.5 down?)
- zen3 `20` https://godbolt.org/z/1fTjhf3To

Thus, `48`.

Sidenote, i'm still unsure whether we should specify that Zen 3 has `FeatureFastVariableShuffle`.
Byte-wise variable shuffle is fast, but some are ucoded.


Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D103144