[all-commits] [llvm/llvm-project] 456bf2: Remove __arm_atomic_store_with_stshh from llvm (#1...

[Lukacma via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 456bf22d5dfd0010c376190b4fca83d5d7cbb857
      https://github.com/llvm/llvm-project/commit/456bf22d5dfd0010c376190b4fca83d5d7cbb857
  Author: Lukacma <Marian.Lukac at arm.com>
  Date:   2026-04-17 (Fri, 17 Apr 2026)

  Changed paths:
    M clang/include/clang/Basic/BuiltinsAArch64.td
    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
    R clang/test/CodeGen/AArch64/pcdphint-atomic-store.c
    M clang/test/CodeGen/arm_acle.c
    M clang/test/CodeGen/builtins-arm64.c
    R 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/AArch64InstrInfo.td
    R llvm/test/CodeGen/AArch64/pcdphint-atomic-store.ll
    M llvm/test/Verifier/AArch64/intrinsic-immarg.ll

  Log Message:
  -----------
  Remove __arm_atomic_store_with_stshh from llvm (#192419)

This patch is revert of #181386 with some manual changes applied due to
revert conflicts.

Current implementation of __arm_atomic_store_with_stshh is incorrect as
it doesn't enforce the memory ordering constraints as can be seen
[here](https://godbolt.org/z/n5YnbaT8E). Different solution will need to
be implemented, but removing for now so users don't pick this up.



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