[all-commits] [llvm/llvm-project] 6f0ca6: [JumpThreading] Insert freeze when unfolding select

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6f0ca6fd2305be860057a1b2c21c6708f4ffdb38
      https://github.com/llvm/llvm-project/commit/6f0ca6fd2305be860057a1b2c21c6708f4ffdb38
  Author: Nikita Popov <nikita.ppv at gmail.com>
  Date:   2022-05-21 (Sat, 21 May 2022)

  Changed paths:
    M llvm/include/llvm/Transforms/Scalar/JumpThreading.h
    M llvm/lib/Transforms/Scalar/JumpThreading.cpp
    M llvm/test/Transforms/JumpThreading/codesize-loop.ll
    M llvm/test/Transforms/JumpThreading/select.ll

  Log Message:
  -----------
  [JumpThreading] Insert freeze when unfolding select

JumpThreading may convert selects into branch instructions,
in which case the condition needs to be frozen (as branch on
poison is immediate undefined behavior, unlike select on poison).

The necessary code for this is already in place, this just enables
the option.

Differential Revision: https://reviews.llvm.org/D125869