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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/100799] Stackoverflow in optimized code on PPC
Date: Tue, 27 Feb 2024 15:30:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100799

--- Comment #31 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #30)
> Either tree parmdef =3D ssa_default_def (cfun, parm) is NULL, or has_zero=
_uses
> (parmdef).
> Not sure if has_zero_uses will work properly after some bbs are converted
> from GIMPLE to RTL, but maybe it will, I think the expansion generally
> doesn't gsi_remove statements it expands nor calls update_stmt on them.  =
One
> could always also just compute in generic code at the start of expansion =
the
> number of unused DECL_HIDDEN_STRING_LENGTH PARM_DECLs at the end of the
> argument list, save that as a flag in struct function or where and let the
> backends use it from there.

Ok, I think that gives us some idea what needs to be done.  I'll look for
someone in the team to have a look at implementing this workaround.  Thanks=
.=