> On Mar 11, 2015, at 3:26 AM, Jonas Maebe <[email protected]> wrote: > > The compiler will, under normal circumstances, never by itself emit an atomic > 64 bit load. My guess is that Jens is passing the address of that field to a > function that is hardcoded (possibly using inline assembly) to perform a 64 > bit atomic load.
The library I’m using is calling the (intrinsic) function __sync_add_and_fetch(). We worked around it by using an __attribute to force 8-byte alignment for that struct field. —Jens
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