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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/108370] gcc doesn't merge bitwise-AND if an explicit
 comparison against 0 is given
Date: Sun, 17 Sep 2023 00:35:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108370

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 55914
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55914&action=3Dedit
Patch

Combined with the patch for PR 109960. We are able to optimize this correct=
ly:
  _5 =3D bio_4(D)->bi_flags;
  _8 =3D _5 & 3;
  if (_8 !=3D 0)
    goto <bb 3>; [66.50%]
  else
    goto <bb 4>; [33.50%]

  <bb 3> [local count: 714038312]:
  _1 =3D (int) mark_dirty_6(D);
  __bio_release_pages (bio_4(D), _1); [tail call]=