[all-commits] [llvm/llvm-project] 24633e: [Peephole] Check instructions from CopyMIs are sti...

[weiguozhi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 24633eac38d46cd4b253ba53258165ee08d886cd
      https://github.com/llvm/llvm-project/commit/24633eac38d46cd4b253ba53258165ee08d886cd
  Author: weiguozhi <57237827+weiguozhi at users.noreply.github.com>
  Date:   2023-10-20 (Fri, 20 Oct 2023)

  Changed paths:
    M llvm/lib/CodeGen/PeepholeOptimizer.cpp
    A llvm/test/CodeGen/X86/peephole-copy.mir

  Log Message:
  -----------
  [Peephole] Check instructions from CopyMIs are still COPY (#69511)

Function foldRedundantCopy records COPY instructions in CopyMIs and uses
it later. But other optimizations may delete or modify it. So before
using it we should check if the extracted instruction is existing and
still a COPY instruction.