[x265] [PATCH] asm code for blockcopy_ps_16x4

[chen]

>+movu       m1,                 [r2]
>+punpcklbw  m2,                 m1,            m0
Here have a hide register copy, try to avoid it by SSE4.1 "pmovzxbw m2, m1"
 
>+movu       [r0],               m2
>+punpckhbw  m1,                 m0
>+movu       [r0 + 16],          m1
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