linux-kernel - Re: [PATCH] x86-64: use 32-bit XOR to zero registers

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Message-ID: <20180626071705.GB26761@gmail.com>
Date:   Tue, 26 Jun 2018 09:17:05 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Jan Beulich <JBeulich@...e.com>
Cc:     mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86-64: use 32-bit XOR to zero registers


* Jan Beulich <JBeulich@...e.com> wrote:

> Some Intel CPUs don't recognize 64-bit XORs as zeroing idioms

Please write out the consequence of that in the changelog.

Thanks,

	Ingo