GNU bug report logs - #70474
Possible bug with `atomic-box-swap!` on OSX/M3 (?!?!)

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From: Tony Garnock-Jones <tonyg <at> leastfixedpoint.com>
To: 70474 <at> debbugs.gnu.org
Subject: bug#70474: Just adding DMB doesn't help
Date: Mon, 22 Apr 2024 09:52:47 +0200

[Message part 1 (text/plain, inline)]

As an alternative to changing the JIT to produce SWPAL/CASAL, because I 
wasn't sure if *all* aarch64 targets support these, I tried adding DMB 
ISH or DMB SY to the end of the generated code sequences. Surprisingly, 
this did not fix the issue! So there's perhaps something fishy about the 
LDAXR-STLXR sequences themselves?

So for now I'll stick on my own machine with SWPAL/CASAL, since this 
does seem to work well enough to let both my own code and fibers run.

Tony

[add-dmb-does-not-help.patch (text/plain, attachment)]

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