[PATCH] D102748: [LoopUnroll] Don't unroll before vectorisation

[Dávid Bolvanský via Phabricator via llvm-commits]

xbolva00 added a comment.

And there is something weird in terms of cost modelling between vectorizers.

See https://bugs.llvm.org/show_bug.cgi?id=47491

If we dont unroll the loop, llvm loop vectorizer vectorizes the loop (cost model says it is profitable).

If we unroll the loop, slp does not vectorize the unrolled loop.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D102748/new/

https://reviews.llvm.org/D102748