Re: [RFC PATCH 00/15] Provide atomics and bitops implemented with ISO C++11 atomics

[Peter Zijlstra]

On Wed, May 18, 2016 at 04:10:37PM +0100, David Howells wrote:
>  (3) I've added cmpxchg_return() and try_cmpxchg() to replace cmpxchg().
>      I've also provided atomicX_t variants of these.  These return the
>      boolean return value from the __atomic_compare_exchange_n() function
>      (which is carried in the Z flag on x86).  Should this be rolled out
>      even without the ISO atomic implementation?

I suppose we could, esp. with GCC-6.1 having cc-output using the Z flag
should result in nicer code.