[PATCH] D125712: [SLP][X86] Improve reordering to consider alternate instruction bundles

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

I'm concerned its yet something else that is being added to SLP to make up for a weakness some place else (usually the cost model mechanism) and may take years to unravel again.

In this case we don't have a way to determine realistic costs for instruction sequences - at best we can optionally provide operands when getting the cost of a single instruction - we already have this problem with folded loads, this could end up being a lot more complex :-(


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D125712/new/

https://reviews.llvm.org/D125712