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From: "palmer at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/106818] code is genereated differently with or
 without 'extern'
Date: Fri, 02 Sep 2022 20:03:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106818

palmer at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |palmer at gcc dot gnu.org

--- Comment #4 from palmer at gcc dot gnu.org ---
(In reply to Andrew Pinski from comment #2)
> Most likely known alignment or not.
> Riscv targets are sensitive to alignment.

Not sure I'm allowed to paste the code in for them, but that's what's going=
 on
here: with -mtune=3Dthead-c906 both cases have a single store, the default =
is for
Rocket which has very slow misaligned accesses.

That said, I think we actually have a bug here: if the extern symbol was re=
ally
of unknown alignment then sharing the lui might not work.=