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Re: [PATCH 5/6] ARM/vgic: Use for_each_set_bit() in vgic_set_irqs_pending()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Michal Orzel <michal.orzel@xxxxxxx>
- Date: Mon, 1 Jul 2024 09:23:05 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, "Bertrand Marquis" <bertrand.marquis@xxxxxxx>
- Delivery-date: Mon, 01 Jul 2024 07:23:16 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25/06/2024 21:07, Andrew Cooper wrote:
>
>
> ... which is better optimised for scalar values, rather than using the
> arbitrary-sized bitmap helpers.
>
> For ARM32:
>
> add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-16 (-16)
> Function old new delta
> vgic_set_irqs_pending 284 268 -16
>
> including removing calls to _find_{first,next}_bit_le(), and two stack-spilled
> words too.
>
> For ARM64:
>
> add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-40 (-40)
> Function old new delta
> vgic_set_irqs_pending 268 228 -40
>
> including removing three calls to find_next_bit().
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
~Michal
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