[all-commits] [llvm/llvm-project] aeaf85: [AMDGPU] Select VGPR versions of MFMA if possible

[Stanislav Mekhanoshin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: aeaf85b9c283c61413c14b52f0f289348eab6a5d
      https://github.com/llvm/llvm-project/commit/aeaf85b9c283c61413c14b52f0f289348eab6a5d
  Author: Stanislav Mekhanoshin <Stanislav.Mekhanoshin at amd.com>
  Date:   2022-02-08 (Tue, 08 Feb 2022)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
    M llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.cpp
    M llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.h
    M llvm/lib/Target/AMDGPU/VOP3PInstructions.td
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.mfma.gfx90a.ll
    M llvm/test/CodeGen/AMDGPU/acc-ldst.ll
    M llvm/test/CodeGen/AMDGPU/gfx90a-enc.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.mfma.bf16.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.mfma.gfx90a.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.mfma.i8.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.mfma.ll
    A llvm/test/CodeGen/AMDGPU/mfma-bf16-vgpr-cd-select.ll
    A llvm/test/CodeGen/AMDGPU/mfma-cd-select.ll
    M llvm/test/CodeGen/AMDGPU/mfma-loop.ll
    A llvm/test/CodeGen/AMDGPU/mfma-vgpr-cd-select.ll
    M llvm/test/CodeGen/AMDGPU/partial-regcopy-and-spill-missed-at-regalloc.ll

  Log Message:
  -----------
  [AMDGPU] Select VGPR versions of MFMA if possible

We can select _vgprcd versions of MAI instructions and have no
AGPRs with the whole budget left for VGPRs if:

1. This is a kernel;
2. It has no calls;
3. It runs at least on 2 waves thus having not more that 256 VGPRs.
4. There is no inline asm requesting AGPRs.

Differential Revision: https://reviews.llvm.org/D117253