[cfe-dev] FYI, Intel folks might be looking to add the __iso_volatile_Xxx family for MSVC STL <atomic> soon

[Reid Kleckner via cfe-dev]

On Thu, Mar 28, 2019 at 1:46 PM JF Bastien <jfbastien at apple.com> wrote:

> On Mar 28, 2019, at 12:02 PM, Billy O'Neal (VC LIBS) <bion at microsoft.com>
> wrote:
>
> Update: VS2019 Update 2 is likely to do this; who do I need to prod such
> that I get to use these unconditionally in our <atomic> ?🙂
>
>
> You want the same feature in clang-cl, so I suggest talking to Reid,
> sending a patch to clang, and having him review it ;-)
>

I think it's just a matter of moving code from BuiltinsAArch64.def
<https://github.com/llvm/llvm-project/blob/master/clang/include/clang/Basic/BuiltinsAArch64.def#L82>
(and
ARM) to Builtins.def, and maybe some followon changes.

The naming for these intrinsics is confusing. It reads as, "do an ISO C++
standard volatile load", but it really means "do an atomic (not volatile)
load", but I suppose the time to address that is long gone.

I went ahead and started a patch to make them available.
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