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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/40635] [12 Regression] bogus name and
 location in 'may be used uninitialized' warning
Date: Wed, 15 Dec 2021 19:14:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D40635

--- Comment #19 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #18)
> The location is still present at g:45f4e2b01b82c72b3a11ff4ad184d7edcf0e63=
d4
> but is lost after:
>=20
> commit 9f55df63154a39d67ef5b24def7044bf87300831
> Author: Andrew Pinski <apinski@marvell.com>
> Date:   Tue Jun 1 01:05:09 2021 +0000
>=20
>     Replace conditional_replacement with match and simplify
>=20=20=20=20=20
>     This is the first of series of patches to simplify phi-opt
>     to use match and simplify in many cases.  This simplification
>     will more things to optimize.

Yes this part is the missing part:
-      /* Set the locus to the first argument, unless is doesn't have one. =
 */
-      locus_0 =3D gimple_phi_arg_location (phi, 0);
-      locus_1 =3D gimple_phi_arg_location (phi, 1);
-      if (locus_0 =3D=3D UNKNOWN_LOCATION)
-        locus_0 =3D locus_1;
-      gimple_set_location (new_stmt, locus_0);

Let me look over the weekend.=