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From: "lis8215 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/60749] combine is overly cautious when
 operating on volatile memory references
Date: Fri, 26 May 2023 13:56:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D60749

Siarhei Volkau <lis8215 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lis8215 at gmail dot com

--- Comment #2 from Siarhei Volkau <lis8215 at gmail dot com> ---
Created attachment 55167
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55167&action=3Dedit
allow combine ld/st of volatile mem with any_extend op

Is anyone bothering on that? I'm, as embedded engineer, sadly looking on th=
at
long standing issue.

I can propose a quick patch which enables combining volatile mem ld/st with
any_extend for most cases. And it seems, like platform specific test results
remain the same with it (arm/aarch64/mips were tested).

Post it in hope it can help for anyone who needs it.=