> > That's true. Actually I see the values are defined by the compiler
> > at compile time, so it would be possible to move all one up?
> No, that is IMHO not possible.  They need to match the enum values that are
> part of libstdc++ ABI already, and not everybody is going to use the
> __ATOMIC_* macros anyway.

I see. Maybe it's best to just forbid HLE_ACQUIRE + RELAXED 
and HLE_RELEASE + RELAXED, because they are very very likely to be wrong. 
Since this all implementation specific anyways could just forced them to 

Essentially Kirill's patch did that except it missed the check
to only do it when RELAXED is in the lower bits.


a...@linux.intel.com -- Speaking for myself only.

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