[all-commits] [llvm/llvm-project] 1f8449: [AMDGPU] Update target helpers & GCNSchedStrategy ...

[Diana Picus via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1f844952558b041ff1b4c27eed7b81c15841ee84
      https://github.com/llvm/llvm-project/commit/1f844952558b041ff1b4c27eed7b81c15841ee84
  Author: Diana Picus <Diana-Magda.Picus at amd.com>
  Date:   2025-03-19 (Wed, 19 Mar 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPU.td
    M llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp
    M llvm/lib/Target/AMDGPU/GCNSubtarget.h
    M llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
    M llvm/unittests/Target/AMDGPU/AMDGPUUnitTests.cpp
    M llvm/unittests/Target/AMDGPU/CMakeLists.txt

  Log Message:
  -----------
  [AMDGPU] Update target helpers & GCNSchedStrategy for dynamic VGPRs (#130047)

In dynamic VGPR mode, we can allocate up to 8 blocks of either 16 or 32
VGPRs (based on a chip-wide setting which we can model with a Subtarget
feature). Update some of the subtarget helpers to reflect this.

In particular:
- getVGPRAllocGranule is set to the block size
- getAddresableNumVGPR will limit itself to 8 * size of a block

We also try to be more careful about how many VGPR blocks we allocate.
Therefore, when deciding if we should revert scheduling after a given
stage, we check that we haven't increased the number of VGPR blocks that
need to be allocated.

---------

Co-authored-by: Jannik Silvanus <jannik.silvanus at amd.com>



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