[PATCH] D36404: Disable jump threading into loop headers

[Balaram Makam via Phabricator via llvm-commits]

bmakam added a comment.

In https://reviews.llvm.org/D36404#835401, @kparzysz wrote:

> On our internal benchmarks it's mostly neutral, but the benchmark that motivated it improved by 5.3%.  We have some extra code, though, that is supposed to deal with similar cases, so some of the impact may be reduced.  By default it keeps the behavior unchanged, so for all other architectures it should have no effect.


@kparzysz, This change regressed spec2017/perlbench by 3% on Falkor. Perhaps we need a late jump-threading pass like Hal suggested?


Repository:
  rL LLVM

https://reviews.llvm.org/D36404