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From: "guojiufu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/113109] [14 Regression] g++ EH tests fail at
 execution time for cris-elf after r14-6674-g4759383245ac97
Date: Sun, 24 Dec 2023 01:16:21 +0000
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X-Bugzilla-Keywords: EH, wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113109

--- Comment #13 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> ---
(In reply to GCC Commits from comment #9)
> The master branch has been updated by Hans-Peter Nilsson <hp@gcc.gnu.org>:
>=20
> https://gcc.gnu.org/g:3d03630b123411340e52d05124cb0cacfa1fc8b0
>=20
> commit r14-6817-g3d03630b123411340e52d05124cb0cacfa1fc8b0
> Author: Hans-Peter Nilsson <hp@axis.com>
> Date:   Sun Dec 24 00:10:32 2023 +0100
>=20
>     CRIS: Fix PR middle-end/113109; "throw" failing
>=20=20=20=20=20
>     TL;DR: the "dse1" pass removed the eh-return-address store.  The
>     PA also marks its EH_RETURN_HANDLER_RTX as volatile, for the same
>     reason, as does visum.  See PR32769 - it's the same thing on PA.
>=20=20=20=20=20
>     Conceptually, it's logical that stores to incoming args are
>     optimized out on the return path or if no loads are seen -
>     at least before epilogue expansion, when the subsequent load
>     isn't seen in the RTL, as is the case for the "dse1" pass.

The stores to the argp/frame can be eliminated only if they are not used.
While for this case, the store may be used by EH handler, it should not be
optimized out.=20

Thanks for catching and handling this quickly.

Happy holidays.=