Re: [Minios-devel] [UNIKRAFT RFC PATCH 1/1] plat/common: Implement ffs/fls for non-x86 architectures

[Julien Grall <julien.grall@xxxxxxx>]

On 10/25/18 11:05 AM, Jianyong Wu wrote:
> From: Jianyong Wu <Jianyong.Wu@xxxxxxx>
>
> Some architectures like Arm64 don't have special instructions
> like x86 to implement ffs/fls functions.
That's not true. Those functions can be implemented using the 
instruction clz (count leading zero) on Arm.
See the ARM ARM and [1] for more details on how to use them.

Cheers,

[1] https://en.wikipedia.org/wiki/Find_first_set

--
Julien Grall

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