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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/109959] `(a > 1) ? 0 : (a == 1)` is not
 optimized when spelled out at -O2+
Date: Wed, 24 May 2023 22:16:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109959

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|`(a > 1) ? 0 : (a =3D=3D 1)` is |`(a > 1) ? 0 : (a =3D=
=3D 1)` is
                   |not optimized when spelled  |not optimized when spelled
                   |out                         |out at -O2+

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I should say this at -O2.

part of the reason is VRP changes `a =3D=3D 1` to be `(bool)a` and then phi=
opt
comes along and decides to factor out the conversion (phiopt did that even
before my recent changes).

at -O1, it is actually optimized during reassoc1 (because the above is not
done) since GCC 7.=