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Re: [PATCH 2/3] x86: use POPCNT for hweight<N>() when available

To: Jan Beulich <jbeulich@xxxxxxxx>
From: Jason Andryuk <jandryuk@xxxxxxxxx>
Date: Mon, 17 Jul 2023 08:30:50 -0400
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
Delivery-date: Mon, 17 Jul 2023 12:31:16 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On Wed, Jul 12, 2023 at 8:34 AM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>
> This is faster than using the software implementation, and the insn is
> available on all half-way recent hardware. Use the respective compiler
> builtins when available.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Jason Andryuk <jandryuk@xxxxxxxxx>

References:
- [PATCH 0/3] x86: allow Kconfig control over psABI level
  - From: Jan Beulich
- [PATCH 2/3] x86: use POPCNT for hweight<N>() when available
  - From: Jan Beulich

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