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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/110176] wrong code at -Os and above on
 x86_64-linux-gnu
Date: Thu, 08 Jun 2023 21:43:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110176

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fre turns:
  b.2_4 =3D b;
  _5 =3D b.2_4 =3D=3D 0;
  _6 =3D (int) _5;
  _7 =3D _6 <=3D i_19;
  _8 =3D (int) _7;
  b =3D _8;

Into:
  b.2_4 =3D b;
  _5 =3D b.2_4 =3D=3D 0;
  _6 =3D (int) _5;
  b =3D 1;

Which is wrong as _6 <=3D -1 is always 0.

(simplify
(cmp (convert@0 @00) (convert?@1 @10))

...

tree min =3D lower_bound_in_type (TREE_TYPE (@10), TREE_TYPE (@00));
tree max =3D upper_bound_in_type (TREE_TYPE (@10), TREE_TYPE (@00));
bool above =3D integer_nonzerop (const_binop (LT_EXPR, type, max, @10));
bool below =3D integer_nonzerop (const_binop (LT_EXPR, type, @10, min));
...
(if (above || below)
...
{ constant_boolean_node (above ? true : false, type); }=