https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97250
--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Florian Weimer from comment #5) > (In reply to H.J. Lu from comment #4) > > x86-64-v2 includes CMPXCHG16B, aka CX16. But -mcx16 doesn't define __CX16__. > > It's called __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16, I think. Is this good > enough? Yes. But a test is missing.
