[all-commits] [llvm/llvm-project] dfa56b: [RFC][DataLayout] Add null pointer value infrastru...

[Shilei Tian via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dfa56b58d663cf79cd4a825ef585aa87d9133a86
      https://github.com/llvm/llvm-project/commit/dfa56b58d663cf79cd4a825ef585aa87d9133a86
  Author: Shilei Tian <i at tianshilei.me>
  Date:   2026-04-30 (Thu, 30 Apr 2026)

  Changed paths:
    M llvm/docs/LangRef.rst
    M llvm/docs/ReleaseNotes.md
    M llvm/include/llvm/IR/DataLayout.h
    M llvm/lib/IR/DataLayout.cpp
    M llvm/unittests/IR/DataLayoutTest.cpp

  Log Message:
  -----------
  [RFC][DataLayout] Add null pointer value infrastructure (#183207)

Add support for specifying the null pointer bit representation per
address space in DataLayout via new pointer spec flags:
- 'z': null pointer is all-zeros
- 'o': null pointer is all-ones

When neither flag is present, the null pointer value is zero.

No target DataLayout strings are updated in this change. This is pure
infrastructure for a future ConstantPointerNull semantic change to
support targets with non-zero null pointers (e.g. AMDGPU).



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