[Bug target/80878] -mcx16 (enable 128 bit CAS) on x86_64 seems not to work on 7.1.0

avi@cloudius-systems.com gcc-bugzilla@gcc.gnu.org
Sat Apr 18 17:14:57 GMT 2020

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80878

--- Comment #20 from Avi Kivity <avi@cloudius-systems.com> ---
Note that clang generates cmpxchg16b when the conditions are ripe:

https://godbolt.org/z/j9Whgh

Previous message (by thread): [Bug tree-optimization/92893] [10 Regression] Unhelpful -Wstringop-overflow warning for a trailing one-element array
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