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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 [thread overview]
Message-ID: <bug-110479-4-JoCkMHwDJH@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-110479-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110479
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 Uroš Bizjak from comment #1)
> (In reply to Thomas Koenig from comment #0)
>
> > movl %edi, %ecx
>
> This one? It is needed because SAL wants its count argument in %cl and first
> argument is passed in %edi (mandated by x86_64 ABI).
>
> With -mbmi2, one gets:
>
> 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.
prev parent reply other threads:[~2023-06-29 15:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-29 8:03 [Bug rtl-optimization/110479] New: " tkoenig at gcc dot gnu.org
2023-06-29 12:41 ` [Bug rtl-optimization/110479] " ubizjak at gmail dot com
2023-06-29 15:21 ` tkoenig at gcc dot gnu.org [this message]
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