[all-commits] [llvm/llvm-project] dcd5a8: [Attributor] Don't replace `AddrSpaceCast` with `C...

[Shilei Tian via All-commits]

  Branch: refs/heads/users/shiltian/do-not-replace-addrspacecast-with-constantpointernull
  Home:   https://github.com/llvm/llvm-project
  Commit: dcd5a83b6a282532ccecd8d06bc2eaad2458148e
      https://github.com/llvm/llvm-project/commit/dcd5a83b6a282532ccecd8d06bc2eaad2458148e
  Author: Shilei Tian <i at tianshilei.me>
  Date:   2025-02-12 (Wed, 12 Feb 2025)

  Changed paths:
    M llvm/lib/Transforms/IPO/AttributorAttributes.cpp
    A llvm/test/Transforms/Attributor/do-not-replace-addrspacecast-with-constantpointernull.ll

  Log Message:
  -----------
  [Attributor] Don't replace `AddrSpaceCast` with `ConstantPointerNull`

`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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