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From: "jamborm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103223] [12 regression] Access attribute
 dropped when ipa-sra is applied
Date: Mon, 15 Nov 2021 18:12:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103223

--- Comment #6 from Martin Jambor <jamborm at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #5)
> I replied earlier on gcc-patches: I've always intended the access attribu=
te
> to eventually benefit optimization so please feel free (and encouraged :)=
 to
> use it
> for that purpose.  The idea behind it was not just to catch bugs but also=
 to
> enable optimizations based on the expectation that those bugs will have b=
een
> fixed.  (This has to be done carefully since the attribute is also
> implicitly added in contexts where relying on it wouldn't correct for
> optimization; the attirbute API makes it possible to distinguish these
> cases.)
>=20
> By dropping the attribute in IPA passes we would not only give up on
> detecting the bugs the IPA transformations expose but also on the
> optimization opportunities they might open up.

Right.  Can you please help us write code that creates access attribute from
another one after parameters at given indices are dropped?=