[PATCH] D75689: [VectorCombine] fold extract-extract-op with different extraction indexes

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

In D75689#1925667 <https://reviews.llvm.org/D75689#1925667>, @jgorbe wrote:

> Hi,
>
> We're seeing some large performance regressions on Eigen (http://eigen.tuxfamily.org/) running on haswell and skylake machines with this patch.


Those are being compiled with the correct `-march=` for the machine that actually runs benchmarks, right?
Can you be more specific? Reproduction steps (which benchmark specifically), perhaps some regressed snippets?

> Could you please revert it?




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  https://reviews.llvm.org/D75689/new/

https://reviews.llvm.org/D75689