[x265] [arm64] port scale1D_128to64 and scale2D_64to32

[chen]

Hi, 


The code looks good.
little performance change because pipeline stall, two of LD1 can't hidden latency penalty, but it is not big problem, we saved the code size.
Could you please make a stalone patch, I guess patch to patch is not good idea.


Regards,
Min Chen

At 2021-07-31 02:27:36, "Pop, Sebastian" <spop at amazon.com> wrote:

A small change to save a few bytes in code size.

I replaced the 4 LD1 2 regs with 2 LD1 4 regs.

No performance change.

 
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