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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/107176] [10/11/12/13 Regression] Wrong code
 at -Os on x86_64-pc-linux-gnu
Date: Fri, 07 Oct 2022 07:30:19 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: needs-bisection, wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107176

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
final value replacement:
  b_lsm.8_26 =3D PHI <b_lsm.8_15(4)>
 with expr: 1
 final stmt:
  b_lsm.8_26 =3D 1;

where

(get_scalar_evolution
  (scalar =3D b_lsm.8_15)
  (scalar_evolution =3D {0, +, 1}_1))
(chrec_apply
  (varying_loop =3D 1)
  (chrec =3D {0, +, 1}_1)
  (x =3D 1)
  (res =3D 1))

and

  <bb 3> [local count: 955630225]:
  _1 =3D (unsigned int) b_lsm.8_15;
  _2 =3D _1 + 4294967206;
  # RANGE [irange] long int [0, 4294967295] NONZERO 0xffffffff
  _12 =3D (long int) _2;
  # RANGE [irange] long int [91, 4294967386] NONZERO 0x1ffffffff
  _3 =3D _12 + 91;

  <bb 4> [local count: 1073741824]:
  # b_lsm.8_15 =3D PHI <0(2), _3(3)>=