[PATCH] D78880: [InstCombine] use select-of-constants with set/clear bit mask patterns

[Sanne Wouda via Phabricator via llvm-commits]

sanwou01 added a comment.

Hi, we're seeing a small (1.0%) regression in omnetpp_r in SPEC INT 2017 on AArch64 with LTO enabled that bisects to this patch. I should be able to reduce omnetpp_r to a small IR example that shows the changed AArch64 codegen, if that's useful. A revert is probably not necessary if all we need is an additional pattern or two in the AArch64 backend.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D78880/new/

https://reviews.llvm.org/D78880