[all-commits] [llvm/llvm-project] 17c8c1: [AMDGPU] Do not fold into v_accvpr_mov/write/read ...

[bcahoon via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 17c8c1c5098bd1fa68809d686867d01d56d5e564
      https://github.com/llvm/llvm-project/commit/17c8c1c5098bd1fa68809d686867d01d56d5e564
  Author: bcahoon <59846893+bcahoon at users.noreply.github.com>
  Date:   2025-01-07 (Tue, 07 Jan 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
    A llvm/test/CodeGen/AMDGPU/no-fold-accvgpr-mov.ll
    A llvm/test/CodeGen/AMDGPU/no-fold-accvgpr-mov.mir
    A llvm/test/CodeGen/AMDGPU/no-fold-accvgpr-read.mir

  Log Message:
  -----------
  [AMDGPU] Do not fold into v_accvpr_mov/write/read (#120475)

In SIFoldOperands, leave copies for moving between agpr and vgpr
registers. The register coalescer is able to handle the copies
more efficiently than v_accvgpr_mov, v_accvgpr_write, and
v_accvgpr_read. Otherwise, the compiler generates unneccesary
instructions such as v_accvgpr_mov a0, a0.



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