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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/106786] [12/13 Regression] Regression in
 cmp+sbb
Date: Wed, 31 Aug 2022 16:03:30 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 12.2.0
X-Bugzilla-Keywords: missed-optimization, needs-bisection
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: NEW
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X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 12.3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106786

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2022-08-31
           Keywords|                            |needs-bisection
             Status|UNCONFIRMED                 |NEW
            Summary|Regression in cmp+sbb       |[12/13 Regression]
                   |                            |Regression in cmp+sbb
   Target Milestone|---                         |12.3
     Ever confirmed|0                           |1

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The difference for esra IR is:
Working (11):
  z.value =3D SR.6_6;
  MEM <unsigned char> [(struct R *)&z + 8B] =3D SR.7_7;
  z$8_32 =3D SR.7_7;
  _1 =3D VIEW_CONVERT_EXPR<bool>(z$8_32);

Not working (12):
  z.value =3D SR.5_6;
  MEM <unsigned char> [(struct R *)&z + 8B] =3D SR.6_7;
  _1 =3D z.carry;

The IR is the similar (the only difference is the decl #) before esra:

  D.2444.carry =3D _19;
  d =3D{v} {CLOBBER(eol)};
  z =3D D.2444;
  _1 =3D z.carry;
  _2 =3D (int) _1;
  _12 =3D (int) _1;=