From: Dave Hansen <dave.hansen@intel.com>
To: Uros Bizjak <ubizjak@gmail.com>,
David Laight <david.laight.linux@gmail.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH RESEND] x86/asm/32: Modernize _memcpy()
Date: Tue, 16 Dec 2025 08:38:05 -0800 [thread overview]
Message-ID: <44af06e3-cb91-4361-b83b-850fc3942aa7@intel.com> (raw)
In-Reply-To: <CAFULd4ahPq+ui5=mx0VHNkfQrqRB2n-HgmXFA1UyNFYtZaCeEA@mail.gmail.com>
On 12/16/25 08:30, Uros Bizjak wrote:
> I don't think that additional subtraction outweighs a move from EAX to
> a temporary.
There are basically two ways this can end up:
1. None of these small changes (like an extra subtraction) matters in
the end, and this is a debate about nothing. The simplest code wins.
2. It matters and can be shown with some data.
Unfortunately, I see a lot more gazing into crystal balls than data
collection right now.
next prev parent reply other threads:[~2025-12-16 16:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-16 10:37 Uros Bizjak
2025-12-16 13:14 ` David Laight
2025-12-16 16:30 ` Uros Bizjak
2025-12-16 16:38 ` Dave Hansen [this message]
2025-12-16 19:18 ` David Laight
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