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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/97135] [11 Regression] Wrong code at -Os
 since r11-408-g84935c98221
Date: Mon, 21 Sep 2020 10:50:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97135

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's lim4 that does the bogus transform.  It seems to be confused by the de=
ad
store in BB3:

  <bb 3> [local count: 118111600]:
  a =3D 1;
  a =3D 6;
  *d.2_3 =3D 0;
  ivtmp.15_9 =3D ivtmp.15_24 + 1;
  if (c.7_7 !=3D 0)
    goto <bb 9>; [5.50%]
  else
    goto <bb 10>; [94.50%]

and re-materializes the a =3D 1 store but not the a =3D 6 one.=