[all-commits] [llvm/llvm-project] 2fba46: [DFAJumpThreading] Don't thread switch without mul...

[XChy via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2fba4694d07ee3f237e7728ab70e5c15c73791a8
      https://github.com/llvm/llvm-project/commit/2fba4694d07ee3f237e7728ab70e5c15c73791a8
  Author: XChy <xxs_chy at outlook.com>
  Date:   2023-11-02 (Thu, 02 Nov 2023)

  Changed paths:
    M llvm/lib/Transforms/Scalar/DFAJumpThreading.cpp
    A llvm/test/Transforms/DFAJumpThreading/single_succ_switch.ll

  Log Message:
  -----------
  [DFAJumpThreading] Don't thread switch without multiple successors (#71060)

Fixes #56882.
Fixes #60254.

When switch has only one successor, it make no sense to thread it. And
computing the cost of it brings div-by-zero exception. We prevent it in
this patch.