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From: "unlvsur at live dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/99396] std::rotl and std::rotr Does not
 convert into ROTATE on the gimple level
Date: Fri, 05 Mar 2021 11:59:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99396

--- Comment #13 from cqwrteur <unlvsur at live dot com> ---
(In reply to Jakub Jelinek from comment #12)
> Created attachment 50305 [details]
> gcc11-pr99396.patch
>=20
> Some further tweaks based on IRC discussions.

shouldn't this be

if constexpr ((_Nd & (_Nd - 1)) =3D=3D 0)
{
}
else
{
}

instead of if ((_Nd & (_Nd - 1)) =3D=3D 0) ?=