[llvm-bugs] [Bug 35094] [AArch64] atomicrmw on Armv8.1-a memory ordering can be changed

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35094

James Greenhalgh <james.greenhalgh at arm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|INVALID                     |---
             Status|RESOLVED                    |REOPENED
                 CC|                            |james.greenhalgh at arm.com

--- Comment #2 from James Greenhalgh <james.greenhalgh at arm.com> ---
Reopening this; the reasoning behind why this is a bug has been spelled out
recently by Will Deacon on gcc-patches recently:

  https://gcc.gnu.org/ml/gcc-patches/2018-10/msg02042.html
  https://gcc.gnu.org/ml/gcc-patches/2018-10/msg02072.html

Clang should not weaken the atomic operations beyond what C11 permits.

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