[PATCH] D90445: [SLP] Make SLPVectorizer to use `llvm.masked.gather` intrinsic

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In D90445#2411311 <https://reviews.llvm.org/D90445#2411311>, @fhahn wrote:

> It appears this is causing a ~2-3% regression on AArch64 for some benchmarks, including `CINT2000/256.bzip2`. Any ideas? It might be caused by underestimating the cost of gather/scatter on AArch64.

Poor target specific costs is likely to be the problem - either for explicit gather intrinsic costs or the scalarization overhead fallback.


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