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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/113727] [14 Regression] csmith: differences
 from nothing to -O1
Date: Tue, 19 Mar 2024 06:47:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113727

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|needs-reduction             |
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2024-03-19

--- Comment #19 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

(In reply to David Binderman from comment #6)
> As expected:
>=20
> trunk.20210101 $ git bisect good 35b5bb475375dba4
> 6decda1a35be5764101987c210b5693a0d914e58 is the first bad commit
> commit 6decda1a35be5764101987c210b5693a0d914e58
> Author: Richard Biener <rguenther@suse.de>
> Date:   Thu Oct 12 11:34:57 2023 +0200
>=20
>     tree-optimization/111779 - Handle some BIT_FIELD_REFs in SRA

yes this seems very much the change which caused the reduced testcase even.
Since if we change the bitfields to non bitfields, things start to work and
```
if (as.au)
```
is changed to:
```
      if ((BIT_FIELD_REF <as, 8, 0> & 31) !=3D 0)
```

by fold.

If we add:
```
int t =3D as.au;
```

Right before that if statemtent things start to work too.=