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From: "luke.geeson at cs dot ucl.ac.uk" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/111246] PPC64 Sequentially Consistent Load allows Reordering of Stores Date: Wed, 30 Aug 2023 20:47:10 +0000 [thread overview] Message-ID: <bug-111246-4-le6tARDaf2@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-111246-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111246 --- Comment #3 from Luke Geeson <luke.geeson at cs dot ucl.ac.uk> --- According to the latest C/C++ and PPC models, yes. If x was non-atomic, then this would be a racy (UB) test, but making x atomic with relaxed order is well-defined according to the C model (and therefore any racy behaviour should not occur). In any case, a sequentially consistent load should not allow re-ordering. We reported (and are patching) a similar bug in LLVM for AArch64 (https://github.com/llvm/llvm-project/issues/62652)
next prev parent reply other threads:[~2023-08-30 20:47 UTC|newest] Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-08-30 20:23 [Bug target/111246] New: " luke.geeson at cs dot ucl.ac.uk 2023-08-30 20:35 ` [Bug target/111246] " luke.geeson at cs dot ucl.ac.uk 2023-08-30 20:38 ` pinskia at gcc dot gnu.org 2023-08-30 20:47 ` luke.geeson at cs dot ucl.ac.uk [this message] 2023-08-30 20:49 ` luke.geeson at cs dot ucl.ac.uk 2023-08-31 13:41 ` dje at gcc dot gnu.org 2023-08-31 13:49 ` luke.geeson at cs dot ucl.ac.uk 2023-08-31 16:23 ` dje at gcc dot gnu.org 2023-08-31 18:04 ` luke.geeson at cs dot ucl.ac.uk 2023-08-31 18:06 ` luke.geeson at cs dot ucl.ac.uk 2023-08-31 18:25 ` dje at gcc dot gnu.org 2023-08-31 18:54 ` luke.geeson at cs dot ucl.ac.uk 2023-08-31 18:58 ` pinskia at gcc dot gnu.org 2023-08-31 19:12 ` luke.geeson at cs dot ucl.ac.uk 2023-08-31 20:00 ` dje at gcc dot gnu.org 2023-08-31 20:49 ` luke.geeson at cs dot ucl.ac.uk 2023-08-31 20:50 ` luke.geeson at cs dot ucl.ac.uk 2023-08-31 20:52 ` dje at gcc dot gnu.org 2023-08-31 20:55 ` luke.geeson at cs dot ucl.ac.uk
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