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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103266] [12 regression] llvm-13
 miscompilation: __builtin_assume_aligned causes over-aggressive dce
Date: Tue, 16 Nov 2021 10:23:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103266

--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> ---
On Tue, 16 Nov 2021, hubicka at kam dot mff.cuni.cz wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103266
>=20
> --- Comment #5 from hubicka at kam dot mff.cuni.cz ---
> > I think 'X' means simply not dereferenced or escaping since this was all
> > PTA based.  'S' would still eventually allow escaping.  But yes, PTA
> > simply takes '1' literally.  So the patch below is IMHO too pessimizing.
> > Can you please fixup modref instead?
>=20
> If X is not meant to be "completely unused" (that is bit useless for
> anotating bulitins I think since most of them shoul dbe sane) but all
> the other flags together, we should update docs and eaf_flags production
> which would fix the issue too.

Well, it was "completely irrelevant" for PTA purposes ;)=