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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102452] Structs with flexible array members
 are not optimized on stack
Date: Thu, 23 Sep 2021 07:21:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102452

--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 23 Sep 2021, pinskia at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102452
>=20
> Andrew Pinski <pinskia at gcc dot gnu.org> changed:
>=20
>            What    |Removed                     |Added
> -------------------------------------------------------------------------=
---
>            Severity|normal                      |enhancement
>           Component|ipa                         |tree-optimization
>=20
> --- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
> Oh it is just esra (and SRA) rejecting the struct:
> Rejected (3268): zero structure field size: ret
>=20
> Rejected (3311): zero structure field size: ret
> Rejected (3309): zero structure field size: D.3309
>=20
> I had read the dump order incorrectly and such.

Yeah - not sure why exactly it execuses itself for !DECL_SIZE fields,
but well.  Something to improve.  (just ignore those fields)=