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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/113406] ICE: tree check: expected class 'type', have
 'exceptional' (error_mark) in useless_type_conversion_p, at gimple-expr.cc:85
 with -fstrub=internal and _BitInt()
Date: Mon, 15 Jan 2024 23:41:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113406

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2024-01-15
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
          Component|tree-optimization           |middle-end

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, scrub is changing the IR to:
```
  void * .strub.watermark.2;
  _BitInt(146) retval.1;

  <bb 2> [local count: 10000]:
  __builtin___strub_enter (&.strub.watermark.2);
  retval.1_3 =3D foo.strub.0 (&.strub.watermark.2);
  __builtin___strub_leave (&.strub.watermark.2);
  .strub.watermark.2 =3D{v} {CLOBBER};
  return retval.1_3;

```
Which looks fine but bitintlower is not expecting a gimple ssa of _BitInt(N=
) in
the GIMPLE_RETURN .

Here is a reduced _GIMPLE testcase without the need for -fstrub=3Dinternal :
```
_BitInt(146)
foo1(void);

_BitInt(146)
__GIMPLE()
foo(void)=20
{
  _BitInt(146) t;
  t =3D foo1();
  return t;
}
```=