[all-commits] [llvm/llvm-project] aed9f1: [AMDGPU] Handle lowering addrspace casts from LDS ...

[Chaitanya via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: aed9f11965d44e86fa5a53c7a6c1dfc7d8cbe6b8
      https://github.com/llvm/llvm-project/commit/aed9f11965d44e86fa5a53c7a6c1dfc7d8cbe6b8
  Author: Chaitanya <Krishna.Sankisa at amd.com>
  Date:   2025-02-19 (Wed, 19 Feb 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp
    M llvm/test/CodeGen/AMDGPU/amdgpu-sw-lower-lds-non-kernel-declaration.ll
    M llvm/test/CodeGen/AMDGPU/amdgpu-sw-lower-lds-static-indirect-access-asan.ll
    M llvm/test/CodeGen/AMDGPU/amdgpu-sw-lower-lds-static-indirect-access-nested-asan.ll
    M llvm/test/CodeGen/AMDGPU/amdgpu-sw-lower-lds-static-indirect-access-nested.ll
    M llvm/test/CodeGen/AMDGPU/amdgpu-sw-lower-lds-static-indirect-access-no-kernel-lds-id.ll
    M llvm/test/CodeGen/AMDGPU/amdgpu-sw-lower-lds-static-indirect-access.ll
    A llvm/test/CodeGen/AMDGPU/amdgpu-sw-lower-lds-static-lds-O0.ll
    A llvm/test/CodeGen/AMDGPU/amdgpu-sw-lower-lds-static-lds-vector-ptrs.ll

  Log Message:
  -----------
  [AMDGPU] Handle lowering addrspace casts from LDS to FLAT address in amdgpu-sw-lower-lds. (#121214)

"infer-address-spaces" pass replaces all refinable generic pointers with
equivalent specific pointers.

At -O0 optimisation level, infer-address-spaces pass doesn't run in the
pipeline.

"amdgpu-sw-lower-lds" pass instruments memory operations on addrspace(3)
ptrs. Since, extra addrspacecasts are present from lds to flat
addrspaces at -O0 and the actual store/load memory instructions are now
on flat addrspace, these addrspacecast need to be handled in the
amdgpu-sw-lower-lds pass itself. This patch lowers the lds ptr first to
the corresponding ptr in the global memory from the asan_malloc. Then
replaces the original cast with addrspacecast from global ptr to flat
ptr.



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