[all-commits] [llvm/llvm-project] 91aea3: [Clang][AMDGPU] Add amdgcn_av("none") attribute fo...

[Sameer Sahasrabuddhe via All-commits]

  Branch: refs/heads/users/ssahasra/av-metadata-clang
  Home:   https://github.com/llvm/llvm-project
  Commit: 91aea372182a8011300352ddf817c0c55592946f
      https://github.com/llvm/llvm-project/commit/91aea372182a8011300352ddf817c0c55592946f
  Author: Sameer Sahasrabuddhe <sameer.sahasrabuddhe at amd.com>
  Date:   2026-07-09 (Thu, 09 Jul 2026)

  Changed paths:
    M clang/include/clang/Basic/Attr.td
    M clang/include/clang/Basic/AttrDocs.td
    M clang/include/clang/Basic/DiagnosticGroups.td
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/lib/CodeGen/CGAtomic.cpp
    M clang/lib/CodeGen/CGBuiltin.cpp
    M clang/lib/CodeGen/CGStmt.cpp
    M clang/lib/CodeGen/CodeGenFunction.h
    M clang/lib/CodeGen/TargetBuiltins/AMDGPU.cpp
    M clang/lib/CodeGen/Targets/AMDGPU.cpp
    M clang/lib/Sema/SemaStmtAttr.cpp
    A clang/test/CodeGen/AMDGPU/amdgcn-av-non-atomic.cpp
    A clang/test/CodeGen/AMDGPU/amdgcn-av-none-amdgpu-atomic.cpp
    A clang/test/CodeGen/AMDGPU/amdgcn-av-none-attr-c-atomic.c
    A clang/test/CodeGen/AMDGPU/amdgcn-av-none-attr.cpp

  Log Message:
  -----------
  [Clang][AMDGPU] Add amdgcn_av("none") attribute for atomic expressions

Add a statement attribute that suppresses MakeAvailable/MakeVisible
cache operations on AMDGPU atomic instructions while preserving memory
ordering (waits).

The attribute takes a string argument specifying the mode. Currently
"none" is the only supported mode. The resulting atomic or fence
instruction carries !mmra !{!"amdgcn-av", !"none"} metadata.

Support includes C/C++ atomic builtins, _Atomic type qualifier
operations, fence builtins, and AMDGPU-specific atomic builtins
marked with TargetAtomicMixin.

Uses Builtin::Context::isTargetAtomicBuiltin() to identify
target-specific atomic builtins in target-neutral Sema code.

Assisted-By: Claude Opus 4.6



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