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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/114489] introduced redundant load facing
 different branches
Date: Tue, 26 Mar 2024 20:19:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114489

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
>   <bb 3> [local count: 375809640]:
>   _3 =3D g1;
>   goto <bb 5>; [100.00%]
>=20
>   <bb 4> [local count: 697932184]:
>   g2.1_2 =3D g2;
>   arr[0] =3D g2.1_2;
>   _8 =3D g1;
>=20
>   <bb 5> [local count: 1073741824]:
>   # _6 =3D PHI <_8(4), _3(3)>
>=20
> Which does not optimize unless using -O2.
>=20
> This is on purpose.

In that PRE is not enabled at -O1 but it is at -O2.=