[all-commits] [llvm/llvm-project] 7d4baf: [AMDGPU] Add maximum NSA size limit ISA feature

[Carl Ritson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7d4baf25aae5dd3610310d655ae5ec2881fb2d81
      https://github.com/llvm/llvm-project/commit/7d4baf25aae5dd3610310d655ae5ec2881fb2d81
  Author: Carl Ritson <carl.ritson at amd.com>
  Date:   2021-07-23 (Fri, 23 Jul 2021)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPU.td
    M llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUSubtarget.cpp
    M llvm/lib/Target/AMDGPU/GCNSubtarget.h
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-llvm.amdgcn.image.sample.a16.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-llvm.amdgcn.image.sample.g16.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.image.gather4.dim.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.image.gather4.o.dim.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.image.sample.g16.ll
    M llvm/test/CodeGen/AMDGPU/cluster_stores.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.image.nsa.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.image.sample.a16.dim.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.image.sample.dim.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.image.sample.g16.a16.dim.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.image.sample.g16.encode.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.image.sample.g16.ll

  Log Message:
  -----------
  [AMDGPU] Add maximum NSA size limit ISA feature

Add maximum NSA size limit as an ISA feature.
Use this to reduce NSA usage on GFX10.1 to avoid stability issues
with 4 and 5 dwords NSA instructions.
Maintain use of longer NSA instructions on GFX10.3.

Note: this also contains some minor fixes for GlobalISel which
did not work correctly with non-NSA form instructions on GFX10.

Reviewed By: foad

Differential Revision: https://reviews.llvm.org/D103348