Re: [PATCH 1/2] arm64: bpf: add 'store immediate' instruction

From	"Shi, Yang" <yang.shi@linaro.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 1/2] arm64: bpf: add 'store immediate' instruction
Date	2015-11-23 20:40 +0100
Message-ID	<qy57Y-6ch-9@gated-at.bofh.it> (permalink)
References	(2 earlier) <qttDX-59m-7@gated-at.bofh.it> <qtCxB-2EB-13@gated-at.bofh.it> <qtD0C-2OK-15@gated-at.bofh.it> <qu5SW-4DS-13@gated-at.bofh.it> <qudx7-18i-1@gated-at.bofh.it>
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Hi folks,

Any more comments on this patch (store immediate only)?

I need more time to add XADD (I'm supposed everyone agrees it is 
equivalent to atomic_add). However, this one is irrelevant to XADD, so 
we may be able to apply it first?

Thanks,
Yang


On 11/12/2015 7:45 PM, Z Lim wrote:
> On Thu, Nov 12, 2015 at 11:33 AM, Shi, Yang <yang.shi@linaro.org> wrote:
>> On 11/11/2015 4:39 AM, Will Deacon wrote:
>>>
>>> Wait a second, we're both talking rubbish here :) The STR (immediate)
>>> form is referring to the addressing mode, whereas this patch wants to
>>> store an immediate value to memory, which does need moving to a register
>>> first.
>>
>>
>> Yes, the immediate means immediate offset for addressing index. Doesn't mean
>> to store immediate to memory.
>>
>> I don't think any load-store architecture has store immediate instruction.
>>
>
> Indeed. Sorry for the noise.
>
> Somehow Will caught a whiff of whatever I was smoking then :)
>

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Re: [PATCH 1/2] arm64: bpf: add 'store immediate' instruction "Shi, Yang" <yang.shi@linaro.org> - 2015-11-23 20:40 +0100

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