[all-commits] [llvm/llvm-project] cba7e5: AMDGPU: Add a few missing mfma rewrite tests

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/add-more-mfma-rewrite-tests
  Home:   https://github.com/llvm/llvm-project
  Commit: cba7e52da8f08fe84bafd14ad1f9aa893bafc00f
      https://github.com/llvm/llvm-project/commit/cba7e52da8f08fe84bafd14ad1f9aa893bafc00f
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2025-08-07 (Thu, 07 Aug 2025)

  Changed paths:
    M llvm/test/CodeGen/AMDGPU/inflate-reg-class-vgpr-mfma-to-agpr-negative-tests.mir
    M llvm/test/CodeGen/AMDGPU/inflate-reg-class-vgpr-mfma-to-av-with-load-source.mir

  Log Message:
  -----------
  AMDGPU: Add a few missing mfma rewrite tests

Test other splitting situations that appear in greedy.
This includes ensuring we have a case that hits a local split
and instruction split (most of the tests hit the region split path).

Also test a few cases where the final result isn't fully used, resulting
in partial copy bundles instead of a simple full copy. Test physreg
and virtreg agpr interference with a reassignment candidate.

I'm accumulating too many failure cases, and MIR tests are very prone
to painful merge conflicts, so I've added a few more tests and extracted
new tests from #147975.

Closes #149026



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