[all-commits] [llvm/llvm-project] d29924: [Attributor] Don't replace `addrspacecast (ptr nul...

[Shilei Tian via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d2992423e336b06a3c75b6f99aed6dd73abc3112
      https://github.com/llvm/llvm-project/commit/d2992423e336b06a3c75b6f99aed6dd73abc3112
  Author: Shilei Tian <i at tianshilei.me>
  Date:   2025-05-20 (Tue, 20 May 2025)

  Changed paths:
    M llvm/lib/Transforms/IPO/Attributor.cpp
    M llvm/test/CodeGen/AMDGPU/addrspacecast.ll
    A llvm/test/Transforms/Attributor/AMDGPU/do-not-replace-addrspacecast-with-constantpointernull.ll
    A llvm/test/Transforms/Attributor/AMDGPU/lit.local.cfg

  Log Message:
  -----------
  [Attributor] Don't replace `addrspacecast (ptr null to ptr addrspace(x))` with `ptr addrspace(x) null` (#126779)

`ConstantPointerNull` represents a pointer with value 0, but it doesn’t
necessarily mean a `nullptr`. `ptr addrspace(x) null` is not the same as
`addrspacecast (ptr null to ptr addrspace(x))` if the `nullptr` in AS X
is not
zero. Therefore, we can't simply replace it.

Fixes #115083.



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