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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/111631] [14 Regression] Wrong code at -Os on
 x86_64-linux-gnu since r14-3217-g4d6132e5932
Date: Thu, 28 Sep 2023 15:19:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111631

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
ldist produces:
  b_25 =3D (long int) j_23;
  d_26 =3D h;
  _8 =3D (sizetype) d_26;
  _38 =3D (char *) b_25;
  __builtin_memset (_38, 0, _8);

and also we have:
  <bb 7> [local count: 13370358]:
  if (j_23 !=3D 0)
    goto <bb 10>; [50.00%]
  else
    goto <bb 11>; [50.00%]

...
  <bb 10> [local count: 6685179]:
  g.10_9 =3D g;
  _10 =3D *g.10_9;
  _11 =3D (unsigned short) _10;
  _12 =3D _11 + 65535;
  _13 =3D (short int) _12;
  *g.10_9 =3D _13;

But since d_26 is 0, originally there was no deferencing of _38 but now the=
re
is and such.=