Re: [PATCH] tools/memory-model: Document herd7 (internal) representation

[Jonas Oberhauser]

Am 5/27/2024 um 3:28 PM schrieb Andrea Parri:
> > > +    |                smp_store_mb | W[once] ->po F[mb]                        |
> >
> > I expect this one to be hard-coded in herd7 source code, but I cannot find
> > it. Can you give me a pointer?
>
> smp_store_mb() is currently mapped to { __store{once}(X,V); __fence{mb}; } in
> the .def file, so it's semantically equivalent to "WRITE_ONCE(); smp_mb();".

By the way, I experimented a little with these kind of mappings to see 
if we can just explicitly encode the mapping there. E.g., I had an idea 
to use
    { __fence{mb-successful-rmw}; __cmpxchg{once}...; 
__fence{mb-successful-rmw}; }

for defining (almost) the current mapping of cmpxchg explicitly.

But none of the changes I made were accepted by herd7.

Do you know how the syntax works?

    jonas