[all-commits] [llvm/llvm-project] 6b9da2: [AMDGPU][LowerBufferFatPointers] Handle addrspacec...

[Krzysztof Drewniak via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6b9da28b2b9f00f347a09a87463d7443928be99b
      https://github.com/llvm/llvm-project/commit/6b9da28b2b9f00f347a09a87463d7443928be99b
  Author: Krzysztof Drewniak <Krzysztof.Drewniak at amd.com>
  Date:   2025-05-20 (Tue, 20 May 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPULowerBufferFatPointers.cpp
    M llvm/test/CodeGen/AMDGPU/lower-buffer-fat-pointers-pointer-ops.ll

  Log Message:
  -----------
  [AMDGPU][LowerBufferFatPointers] Handle addrspacecast null to p7 (#140775)

Some application code operating on generic pointers (that then gete
initialized to buffer fat pointers) may perform tests against nullptr.
After address space inference, this results in comparisons against
`addrspacecast (ptr null to ptr addrspace(7))`, which were crashing.

However, while general casts to ptr addrspace(7) from generic pointers
aren't supposted, it is possible to cast null pointers to the all-zerose
bufer resource and 0 offset, which this patch adds.

It also adds a TODO for casting _out_ of buffer resources, which isn't
implemented here but could be.



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