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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/111657] Memory copy with structure assignment from
 named address space is not working
Date: Sun, 01 Oct 2023 22:26:05 +0000
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X-Bugzilla-Component: middle-end
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X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111657

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
         Depends on|79649                       |
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-10-01
             Status|UNCONFIRMED                 |NEW

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is unrelated to PR 79649 as IV-OPTS does nothing here.

if we do `-mstringop-strategy=3Dloop`, it works fine but
`-mstringop-strategy=3Dlibcall` is broken.

Seems like the middle-end expansion for the copy for the libcall case does
worse than the target specific loop.
Now the backend could select the target specific loop for this rather than =
the
libcall case ....


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D79649
[Bug 79649] Memset pattern in named address space crashes compiler or gener=
ates
wrong code=