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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/112356] New: `x == MIN & x > y` is not
 optimized to 0 if x was casted to signed from unsigned
Date: Thu, 02 Nov 2023 20:53:52 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: pinskia at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112356

            Bug ID: 112356
           Summary: `x =3D=3D MIN & x > y` is not optimized to 0 if x was
                    casted to signed from unsigned
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: pinskia at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
#include <limits.h>

signed f2_1( unsigned x,  signed y)
{
   signed xs =3D x;
   signed t =3D x =3D=3D INT_MIN;
   signed t1 =3D xs > y;
  return t & t1;
}
```

This is not optimized to 0.=