[all-commits] [llvm/llvm-project] fdf4dc: [InferAddressSpaces] Add a TTI hook for address sp...

[Alex MacLean via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fdf4dcb7b7ddb33e5f4c9ab7fad0fca2e0170daa
      https://github.com/llvm/llvm-project/commit/fdf4dcb7b7ddb33e5f4c9ab7fad0fca2e0170daa
  Author: Alex MacLean <amaclean at nvidia.com>
  Date:   2026-09-22 (Tue, 22 Sep 2026)

  Changed paths:
    M llvm/include/llvm/Analysis/TargetTransformInfo.h
    M llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
    M llvm/lib/Analysis/TargetTransformInfo.cpp
    M llvm/lib/Target/NVPTX/NVPTXTargetTransformInfo.h
    M llvm/lib/Transforms/Scalar/InferAddressSpaces.cpp
    A llvm/test/CodeGen/NVPTX/infer-address-space-join.ll
    A llvm/test/Transforms/InferAddressSpaces/NVPTX/address-space-join.ll

  Log Message:
  -----------
  [InferAddressSpaces] Add a TTI hook for address space joins (#225161)

InferAddressSpaces currently joins different specific address spaces to
the flat address space. This misses cases where the target has a more
specific common space. For NVPTX, a PHI or select combining shared (AS3)
and cluster-shared (AS7) pointers can use AS7, allowing loads through
the result to use ld.shared::cluster.

Add a getAddressSpaceJoin TTI hook and implement the AS3/AS7 join for
NVPTX.



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