From: Jan Beulich <jbeulich@suse.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: binutils@sourceware.org
Subject: Re: [PATCH] x86: Replace CpuABM with CpuPOPCNT
Date: Mon, 17 Feb 2020 15:40:00 -0000 [thread overview]
Message-ID: <b09a16df-91c3-5235-208b-009f36a2edf6@suse.com> (raw)
In-Reply-To: <20200217152740.GA270001@gmail.com>
On 17.02.2020 16:27, H.J. Lu wrote:
> AMD ABM has 2 instructions: popcnt and lzcnt. ABM CPUID feature bit has
> been reused for lzcnt and a POPCNT CPUID feature bit is added for popcnt.
> This patch removes CpuABM and adds CpuPOPCNT. It changes ABM to enable
> both lzcnt and popcnt, changes SSE4.2 to also enable popcnt.
I don't think removing support for something may have in active and
working use is a good idea. Adding some better mechanism as
_suggested_ replacement is of course fine, but people would better
not be forced to change their _correct_ code because of gas side
change.
Jan
next prev parent reply other threads:[~2020-02-17 15:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-17 15:27 H.J. Lu
2020-02-17 15:40 ` Jan Beulich [this message]
2020-02-17 15:43 ` H.J. Lu
2020-02-17 15:46 ` Jan Beulich
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