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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102725] -fno-builtin leads to call of strlen
 since r12-4283-g6f966f06146be768
Date: Wed, 13 Oct 2021 08:46:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102725

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #2)
> (In reply to Andrew Pinski from comment #1)
> > You need -fno-tree-loop-distribution -fno-tree-loop-distribute-patterns=
 to
> > turn it off.  There is another older bug about this for memcpy.
>=20
> Well, I would expect this optimization would do the optimization only if
> __builtin_strlen is allowed (not disallowed by the option).

__builtin_strlen is always allowed even if -fno-builtin.  -fno-builtin just
disables strlen -> __builtin_strlen conversion.  See the other bugs that I
referenced for an example.  There are more dealing with memcpy too.=