[all-commits] [llvm/llvm-project] 44c9e4: [InstrRef] Fix mismatch between LiveDebugValues an...

[Shubham Sandeep Rastogi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 44c9e46fce12badae8cd3f5bd53fe1c2b1248940
      https://github.com/llvm/llvm-project/commit/44c9e46fce12badae8cd3f5bd53fe1c2b1248940
  Author: Shubham Sandeep Rastogi <srastogi22 at apple.com>
  Date:   2025-01-27 (Mon, 27 Jan 2025)

  Changed paths:
    M llvm/lib/CodeGen/MachineFunction.cpp

  Log Message:
  -----------
  [InstrRef] Fix mismatch between LiveDebugValues and salvageCopySSA (#124233)

The LiveDebugValues pass and the instruction selector (which calls
salvageCopySSA) need to be consistent on what they consider a copy
instruction. With https://github.com/llvm/llvm-project/pull/75184, the
definition of what a copy instruction is was narrowed for AArch64 to
exclude a w->x ORR and treat it as a zero-extend rather than a copy

However, to make sure LiveDebugValues still treats a w->x ORR as a copy,
the new function, isCopyLikeInstr was created. We need to make sure that
salvageCopySSA also calls that function.

This patch addresses this mismatch.



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