[libdispatch-dev] lib dispatch worker threads may loop depending on compiler optimization

[Paolo Bonzini]

On Fri, Sep 9, 2011 at 19:33, Joakim Johansson <jocke at tbricks.com> wrote:
>>> I'm still betting that GCC changed in this regard.
>>
>> No, it didn't.  Really, believe me, unlike you I can follow GCC development. ;)
>>
> Paolo, did you look at the bug report linked to in the original mail?
>
> I haven't followed gcc development, but really, how would you in that case explain
> the disassembly from 4.5.1 attached there?

_Something_ in GCC changed, perhaps alias analysis or the scheduler.
But nothing related to atomics.  The bug has always been latent since
atomics were introduced in GCC 4.2.

Paolo