[all-commits] [llvm/llvm-project] 6d003f: [AArch64][clang][llvm] Add ACLE `stshh` atomic sto...

[Jonathan Thackray via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6d003f5033b324aa0319cd3ee8912bde80a915d6
      https://github.com/llvm/llvm-project/commit/6d003f5033b324aa0319cd3ee8912bde80a915d6
  Author: Jonathan Thackray <jonathan.thackray at arm.com>
  Date:   2026-03-05 (Thu, 05 Mar 2026)

  Changed paths:
    M clang/include/clang/Basic/BuiltinsAArch64.def
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/lib/CIR/CodeGen/CIRGenBuiltinAArch64.cpp
    M clang/lib/CodeGen/TargetBuiltins/ARM.cpp
    M clang/lib/Headers/arm_acle.h
    M clang/lib/Sema/SemaARM.cpp
    A clang/test/CodeGen/AArch64/pcdphint-atomic-store.c
    M clang/test/CodeGen/arm_acle.c
    M clang/test/CodeGen/builtins-arm64.c
    A clang/test/Sema/AArch64/pcdphint-atomic-store.c
    M llvm/include/llvm/IR/IntrinsicsAArch64.td
    M llvm/lib/IR/Verifier.cpp
    M llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp
    M llvm/lib/Target/AArch64/AArch64InstrFormats.td
    M llvm/lib/Target/AArch64/AArch64InstrInfo.td
    M llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
    A llvm/test/CodeGen/AArch64/pcdphint-atomic-store.ll
    M llvm/test/Verifier/AArch64/intrinsic-immarg.ll

  Log Message:
  -----------
  [AArch64][clang][llvm] Add ACLE `stshh` atomic store builtin (#181386)

Add `__arm_atomic_store_with_stshh` implementation as defined in the
ACLE. Validate arguments passed are correct, and lower to the `stshh`
intrinsic plus an atomic store using a pseudo-instruction with the
allowed orderings:
  * memory orderings: relaxed, release, seq_cst
  * retention policies: keep, strm

The `STSHH` instruction (Store with Store Hint for Hardware) is part
of the `FEAT_PCDPHINT` extension.



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