[all-commits] [llvm/llvm-project] a0bad8: [AMDGPU][GlobalIsel] Add RegBankLegalize rules and...

[Abhinav Garg via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a0bad855ccb86c0ace7be1eb05e51895d61afecc
      https://github.com/llvm/llvm-project/commit/a0bad855ccb86c0ace7be1eb05e51895d61afecc
  Author: Abhinav Garg <abhinav.garg at amd.com>
  Date:   2026-06-12 (Fri, 12 Jun 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeHelper.cpp
    M llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeHelper.h
    M llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.cpp
    M llvm/lib/Target/AMDGPU/AMDGPURegBankLegalizeRules.h
    M llvm/test/CodeGen/AMDGPU/GlobalISel/is-safe-to-sink-bug.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.s.buffer.load.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.set.inactive.ll
    A llvm/test/CodeGen/AMDGPU/GlobalISel/regbanklegalize-amdgcn.s.buffer.load.ll
    A llvm/test/CodeGen/AMDGPU/GlobalISel/regbanklegalize-amdgcn.s.buffer.load.subdword.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-amdgcn-s-buffer-load.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-amdgcn.s.buffer.load.ll
    M llvm/test/CodeGen/AMDGPU/gfx12_scalar_subword_loads.ll
    M llvm/test/CodeGen/AMDGPU/scalar-float-sop2.ll

  Log Message:
  -----------
  [AMDGPU][GlobalIsel] Add RegBankLegalize rules and lowering for G_AMDGPU_S_BUFFER_LOAD (#192480)

Add RegBankLegalize rules and lowering for G_AMDGPU_S_BUFFER_LOAD and
sub-dword variants (UBYTE, SBYTE, USHORT, SSHORT). The lowering covers
all four rsrc/offset divergence combinations:
- Uniform rsrc + uniform offset → scalar SMEM (stays as-is)
- Uniform rsrc + divergent offset → MUBUF (S_BUF_to_BUF, no waterfall)
- Divergent rsrc + uniform offset → SMEM in waterfall loop over rsrc
- Divergent rsrc + divergent offset → MUBUF + waterfall over rsrc

TODO: 
1. Fix legalize rule for intrinsic amdgcn_cvt_pkrtz to emit scalar cvt
operation in _/AMDGPU/scalar-float-sop2.ll_
2. Fix offset for GFX1250 in
_/AMDGPU/GlobalISel/regbankselect-amdgcn.s.buffer.load.ll_ as done by
PR#178389



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