[PATCH] D84940: [JumpThreading] Conditionally freeze its condition when unfolding select

[Juneyoung Lee via Phabricator via llvm-commits]

aqjune created this revision.
aqjune added reviewers: efriedma, jdoerfert, nikic, lebedev.ri, spatel.
Herald added subscribers: llvm-commits, dexonsmith, hiraditya.
Herald added a project: LLVM.
aqjune requested review of this revision.

This patch is fixes pr45956 (https://bugs.llvm.org/show_bug.cgi?id=45956 ).
To minimize its impact to the quality of generated code, I suggest enabling
this only for LTO as a start (it has two JumpThreading passes registered).
This patch contains a flag that makes JumpThreading enable it. A patch that makes this run
in LTO passes will be uploaded soon.

To minimize performance degradation, a few updates to JumpThreading were
needed. I'll upload them and add as child patches. This does not resolve all
regressions yet, however.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D84940

Files:
  llvm/include/llvm/Transforms/Scalar.h
  llvm/include/llvm/Transforms/Scalar/JumpThreading.h
  llvm/lib/Transforms/Scalar/JumpThreading.cpp
  llvm/test/Transforms/JumpThreading/select-unfold-freeze.ll

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