[all-commits] [llvm/llvm-project] 368681: [GVNHoist] drop debug location according to the de...

[Aditya Kumar via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 368681f803830f42c539fe37e753d8401a121454
      https://github.com/llvm/llvm-project/commit/368681f803830f42c539fe37e753d8401a121454
  Author: Aditya Kumar <1894981+hiraditya at users.noreply.github.com>
  Date:   2022-03-30 (Wed, 30 Mar 2022)

  Changed paths:
    M llvm/lib/Transforms/Scalar/GVNHoist.cpp
    A llvm/test/Transforms/GVNHoist/hoist-drop-debug-info.ll

  Log Message:
  -----------
  [GVNHoist] drop debug location according to the debug info guide

According to the LLVM debug info update guide: https://llvm.org/docs/HowToUpdateDebugInfo.html,
"Hoisting identical instructions which appear in several successor
blocks into a predecessor block. In this case there is no single
merged instruction. The rule for dropping locations applies".

Thanks to Yuanbo Li for reporting this.

Reviewed By: dblaikie

Reviewers: sebpop, tejohnson, dblaikie

Differential Revision: https://reviews.llvm.org/D122730