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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/110479] Unnecessary register move
Date: Thu, 29 Jun 2023 15:21:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110479

Thomas Koenig <tkoenig at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Uro=C5=A1 Bizjak from comment #1)
> (In reply to Thomas Koenig from comment #0)
>=20
> >         movl    %edi, %ecx
>=20
> This one? It is needed because SAL wants its count argument in %cl and fi=
rst
> argument is passed in %edi (mandated by x86_64 ABI).
>=20
> With -mbmi2, one gets:
>=20
>         shrl    $10, %edi
>         movl    $1, %eax
>         andl    $3, %edi
>         addl    $3, %edi
>         shlx    %edi, %eax, %eax
>         ret

Hm, you're right.  The intricacies of x86...

Closing.=