[all-commits] [llvm/llvm-project] 30f18e: [AMDGPU] Handle SMRD signed offset immediate

[Austin Kerbow via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 30f18ed387c128a12fc1027c066c2f81b6d55fce
      https://github.com/llvm/llvm-project/commit/30f18ed387c128a12fc1027c066c2f81b6d55fce
  Author: Austin Kerbow <Austin.Kerbow at amd.com>
  Date:   2020-04-02 (Thu, 02 Apr 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
    M llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
    M llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
    M llvm/test/CodeGen/AMDGPU/GlobalISel/inst-select-load-constant.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/smrd.ll
    M llvm/test/CodeGen/AMDGPU/smrd.ll

  Log Message:
  -----------
  [AMDGPU] Handle SMRD signed offset immediate

Summary:
This fixes a few issues related to SMRD offsets. On gfx9 and gfx10 we have a
signed byte offset immediate, however we can overflow into a negative since we
treat it as unsigned.

Also, the SMRD SOFFSET sgpr is an unsigned offset on all subtargets. We
sometimes tried to use negative values here.

Third, S_BUFFER instructions should never use a signed offset immediate.

Differential Revision: https://reviews.llvm.org/D77082