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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110992] [13/14 Regression] missed VRP
 optimization due to transformation of `a & -zero_one_valued_p` into `a *
 zero_one_valued_p`
Date: Fri, 15 Sep 2023 04:33:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110992

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #7)
> Actually we should transform it into
> ((convert)zero_one_valued_p) & (a !=3D 0)
>=20
> Or ^1 for the =3D=3D 0 case ...
>=20
> This should allow for better code I think.

Or better yet:
(((Convert)cmp) & b) !=3D 0
Into cmp & (b!=3D0)

Icmp for =3D=3D 0.
Now I have seen that before too.=