[all-commits] [llvm/llvm-project] 9ba452: [JumpThreading] Don't pass DT to isGuaranteedNotTo...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9ba452b08eb5368bd89126102031b687d0ecdbaf
      https://github.com/llvm/llvm-project/commit/9ba452b08eb5368bd89126102031b687d0ecdbaf
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2022-05-17 (Tue, 17 May 2022)

  Changed paths:
    M llvm/lib/Transforms/Scalar/JumpThreading.cpp

  Log Message:
  -----------
  [JumpThreading] Don't pass DT to isGuaranteedNotToBeUndefOrPoison()

JumpThreading intentionally does not force updating of the DT
during optimization, because this may be expensive when many CFG
updates and DT calculations are interleaved.

We shouldn't be fetching the DT just for the purpose of calling
isGuaranteedNotToBeUndefOrPoison(), especially as DT availability
doesn't even show benefit in tests.