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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/105163] [9/10/11/12 Regression] ICE: SSA
 corruption since r0-122928
Date: Wed, 06 Apr 2022 07:15:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105163

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot =
gnu.org

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's reassoc:

  <bb 5> [local count: 1072883005]:
  _1 =3D -d_4(ab);
  d_17(ab) =3D 8;
...

@@ -47,7 +61,7 @@
     goto <bb 9>; [50.00%]

   <bb 8> [local count: 176954885]:
-  _2 =3D _1 + 1;
+  _2 =3D 1 - d_4(ab);
   _3 =3D (int) _2;
   *z_19(D) =3D _3;

and that via negate propagation I guess.=