[all-commits] [llvm/llvm-project] a13bbe: AMDGPU: Delete redundant recursive copy handling code

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/amdgpu/remove-redundant-recursive-copy-folding-fold-imm-true16-regression
  Home:   https://github.com/llvm/llvm-project
  Commit: a13bbe6e51b50adfe8026f5fba65cf013bf32dc1
      https://github.com/llvm/llvm-project/commit/a13bbe6e51b50adfe8026f5fba65cf013bf32dc1
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2025-11-04 (Tue, 04 Nov 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
    M llvm/test/CodeGen/AMDGPU/llvm.is.fpclass.f16.ll
    M llvm/test/CodeGen/AMDGPU/true16-fold.mir
    A llvm/test/CodeGen/AMDGPU/true16-imm-folded-to-0-regression.ll

  Log Message:
  -----------
  AMDGPU: Delete redundant recursive copy handling code

This fixes a regression exposed after 445415219708f9539801018e03282049ca33e0e2.
This introduces a few small regressions for true16. There are more cases
where the value can propagate through subregister extracts which need
new handling. They're also small enough that perhaps there's a way to avoid
needing to deal with this case in the first place.



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