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From: "campbell+gcc-bugzilla at mumble dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/110592] [SPARC] GCC should default to TSO memory model
 when compiling for sparc32
Date: Wed, 12 Jul 2023 12:17:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110592

--- Comment #7 from Taylor R Campbell <campbell+gcc-bugzilla at mumble dot =
net> ---
> Sorry, no, NetBSD/sparc is too obscure a platform to justify changing the
> default for the entire compiler.  But you can do like Linux & Solaris and
> add sparc/tso.h to the tm_file list of sparc-*-netbsdelf*) in config.gcc.

I don't understand, how would that help?  As I understand it, whenever
`-mcpu=3Dv7', the memory model is just ignored -- even if we set it to TSO =
--
because all rules that depend on it are gated on TARGET_V8 || TARGET_V9 or
similar.

I'm not asking for you to change defaults in Linux or Solaris -- I'm just
asking to be _able_ to say `-mcpu=3Dv7 -mmemory-model=3Dtso' and get v7-only
instruction streams with the LDSTUBs needed for TSO.  Right now, with
`-mcpu=3Dv7', passing `-mmemory-model=3Dtso' has no effect.=