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Re: [PATCH 3/4] xen/arm: domain: Fix MISRA C 2012 Rule 8.7 violation
- To: Stefano Stabellini <sstabellini@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 27 Jul 2022 08:04:56 +0200
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- Cc: Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Xenia Ragiadakou <burzalodowa@xxxxxxxxx>
- Delivery-date: Wed, 27 Jul 2022 06:05:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.07.2022 02:10, Stefano Stabellini wrote:
> On Tue, 26 Jul 2022, Jan Beulich wrote:
>> You forgot the imo better intermediate option of using the "X" constraint.
>
> I couldn't get "X" to compile in any way (not even for arm64). Do you
> have a concrete example that you think should work using "X" as
> constraint?
Perhaps you tried to use the respective input then as an operand to
the insn? That won't work afaik - as Xenia says, it can be used only
as a "fake" operand (i.e. one that tells the compiler something, but
having no direct meaning for the insn).
Actually I thought we had uses of "X" already somewhere in Xen and/or
XTF, but now that I looked I can't find any. (Anymore?)
Jan
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