[PATCH] D115462: [SLP]Improve shuffles cost estimation where possible.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev added a comment.

In D115462#3603899 <https://reviews.llvm.org/D115462#3603899>, @MaskRay wrote:

> Here is `-mllvm -print-changed -mllvm -print-module-scope` output before SLPVectorizer: https://gist.github.com/MaskRay/23f0db50e136127fda1b4f83db2488da

Double checked the patch and the results. The patch itself does not change the vectorization, just adjusts the cost model estimation. Some of the buildvector sequences are not profitable for re-vectorization after this patch, nothing else. Plus, the code after this patch results in the same code, being applied to the compiler without the patch, i.e. the code transformations are the same, just different vectorization.
Maybe the debug info is corrupted somehow? Or there are other effects?


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  https://reviews.llvm.org/D115462/new/

https://reviews.llvm.org/D115462