Thanks for your answer, Adrien.
> 2021年1月13日 下午9:26，Adrien Grand <jpou...@gmail.com> 写道：
>
> Hello,
>
> It is indeed because I could get the compiler to use SIMD instructions with
> the loop written this way.
>
> On Wed, Jan 13, 2021 at 11:29 AM LuXugang <xugan...@icloud.com.invalid> wrote:
> Hi Adrien,
>
> I have some confusion about the method collapse8(long[ ] arr) in ForUtil class
>
> <粘贴的图形-1.png>
>
>
> On line 85, the loop times are 16, because there are 128 elements in arr, and
> eight elements were processed at a time.
>
> My question is why not choose the elements in order , like in the first loop,
> arr[0] ~ arr[7] were chosen, in the second loop, arr[8] ~ arr[15] were
> chosen …
>
> Is it cause the compiler cann’t generate SIMD instructions or just something
> else?
>
> Could you help me find the answer here？
>
>
> --
> Adrien
