[LLVMdev] __atomic_fetch_add on ARM

[Rafael Espíndola]

I think this is two bugs in one:

* In ABIs that don't use external functions for atomics (linux hard
float at least), we incorrectly decide to use function calls.
* In ABIs that do use external function calls (non hard float linux?),
we don't have code to actually generate the calls.

See the thread in
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20130415/078021.html.
The hard float case has been in my personal todo list for some time,
but I never got to it :-(

On 9 May 2013 19:14, Renato Golin <renato.golin at linaro.org> wrote:
> Hi Benjamin,
>
> Several people (including me) are hitting this bug on ARM:
>
> http://llvm.org/bugs/show_bug.cgi?id=15429
>
> From my investigations it happens on Ubuntu 12.10+ but not on 12.04. From
> Tom Gail's, it happens with --enable-optimized and doesn't without. You seem
> to have a clue on what that happens, can you shed some light on the matter?
>
> I see this error when self-hosting Clang on Ubuntu 12.10 on ARM but hadn't
> had time to investigate with the release process running on Ubuntu 12.04. We
> can certainly help you debug this, or if you point me to the right place I
> can do some tests and send a patch as soon as possible.
>
> cheers,
> --renato
>
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