[all-commits] [llvm/llvm-project] 7fa41d: [DFAJumpThreading] Only unfold select coming from ...

[XChy via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7fa41d8a8f897219a6b22ab7a288f445e9d6119b
      https://github.com/llvm/llvm-project/commit/7fa41d8a8f897219a6b22ab7a288f445e9d6119b
  Author: XChy <xxs_chy at outlook.com>
  Date:   2023-11-02 (Thu, 02 Nov 2023)

  Changed paths:
    M llvm/lib/Transforms/Scalar/DFAJumpThreading.cpp
    M llvm/test/Transforms/DFAJumpThreading/dfa-unfold-select.ll

  Log Message:
  -----------
  [DFAJumpThreading] Only unfold select coming from directly where it is defined (#70966)

Fixes #64860.
When a select instruction comes in by PHINode, the phi's incoming block
for it can flow indirectly past other BasicBlock into it. In this case,
we cannot unfold select to the phi's BB.