[all-commits] [llvm/llvm-project] 5d2e28: MachineCopyPropagation: Do not remove copies prese...

[Jinsong Ji via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5d2e2847e09ae70e24b6c749c08028e705786113
      https://github.com/llvm/llvm-project/commit/5d2e2847e09ae70e24b6c749c08028e705786113
  Author: Jinsong Ji <jinsong.ji at intel.com>
  Date:   2025-02-10 (Mon, 10 Feb 2025)

  Changed paths:
    M llvm/lib/CodeGen/MachineCopyPropagation.cpp
    A llvm/test/CodeGen/MIR/X86/pr126107.mir

  Log Message:
  -----------
  MachineCopyPropagation: Do not remove copies preserved by regmask (#125868)

llvm/llvm-project at 9e436c2daa44 tries to handle register masks and
sub-registers, it avoids clobbering RegUnit presreved by regmask. But it
then introduces invalid pointer issues.

We delete the copies without invalidate all the use in the CopyInfo, so
we dereferenced invalid pointers in next interation, causing asserts.

Fixes: #126107

---------

Co-authored-by: Matt Arsenault <arsenm2 at gmail.com>



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