[x265] primitives for RExt

[chen]

At 2014-08-06 12:09:42,"Satoshi Nakagawa" <nakagawa424 at oki.com> wrote:

>>-    mov       byte [rsp], %2/4
>>+    mov       dword [rsp], %2/4
>Why dword? byte is enough for dynamic range
 

partial write needs read-modify-write.

Are you means partial access stall?

I remember it just for register
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