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[Bug target/80878] -mcx16 (enable 128 bit CAS) on x86_64 seems not to work on 7.1.0
- From: "andysem at mail dot ru" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 29 Mar 2018 18:23:38 +0000
- Subject: [Bug target/80878] -mcx16 (enable 128 bit CAS) on x86_64 seems not to work on 7.1.0
- Auto-submitted: auto-generated
- References: <bug-80878-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80878
--- Comment #14 from andysem at mail dot ru ---
> On Intel, all CAS operations always write, even if thr compare failed.
I understand that. The question is whether this is allowed behavior for
atd::atomic::load() operation according to the C++ standard.