[all-commits] [llvm/llvm-project] 49a533: AMDGPU: Stop introducing v_accvgpr_write_b32 for r...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 49a533a4859eac99efac3220a1ffc62616cb3664
      https://github.com/llvm/llvm-project/commit/49a533a4859eac99efac3220a1ffc62616cb3664
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2025-03-03 (Mon, 03 Mar 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
    M llvm/test/CodeGen/AMDGPU/si-fold-operands-agpr-copy-reg-sequence.mir

  Log Message:
  -----------
  AMDGPU: Stop introducing v_accvgpr_write_b32 for reg-to-reg copy (#129059)

This was trying to hack around the intermediate VGPR requirement
to copy to AGPRs on gfx908. We should still use a copy for all
reg-to-reg cases. This should matter less these days, as we
reserve a VGPR to handle it when required (and no end to end tests
need updating).

This was also an obstacle to handling this fold for input registers
which are larger than 32-bits.



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