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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/107493] [13 Regression] Wrong code at -Os on
 x86_64-linux-gnu
Date: Tue, 01 Nov 2022 15:25:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107493

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |12.1.0
   Last reconfirmed|                            |2022-11-01
      Known to fail|                            |13.0
     Ever confirmed|0                           |1
            Summary|Wrong code at -Os on        |[13 Regression] Wrong code
                   |x86_64-linux-gnu            |at -Os on x86_64-linux-gnu
   Target Milestone|---                         |13.0
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
sccp is broken:

Estimating # of iterations of loop 1
Statement (exit)if (a_lsm.10_13 <=3D 0)
 is executed at most 0 (bounded by 0) + 1 times in loop 1.
Induction variable (int) 65517 + 10 * iteration does not wrap in statement =
_1 =3D
a_lsm.10_13 + 2;
 in loop 1.
Statement _1 =3D a_lsm.10_13 + 2;
 is executed at most 429490178 (bounded by 429490178) + 1 times in loop 1.
Induction variable (int) 65525 + 10 * iteration does not wrap in statement =
_4 =3D
(int) _3;
 in loop 1.
Statement _4 =3D (int) _3;
 is executed at most 1 (bounded by 1) + 1 times in loop 1.

final value replacement:
  a_lsm.10_14 =3D PHI <a_lsm.10_13(4)>
 with expr: 65515
 final stmt:
  a_lsm.10_14 =3D 65515;

Confirmed.=