[x265] [PATCH] asm: added 16bpp support for dct[4x4, 8x8], idct4x4, dst4x4 and idst4x4 primitives

[chen]

>@@ -365,11 +360,18 @@
> ;void idst4(int32_t *src, int16_t *dst, intptr_t stride)
> ;-------------------------------------------------------
> INIT_XMM sse2
>-cglobal idst4, 3, 4, 6
>-
>+cglobal idst4, 3, 4, 7
>+%if BIT_DEPTH == 8
>+  %define m6  [pd_2048]
>+  %define IDCT4_SHIFT 12
>+%elif BIT_DEPTH == 10
>+  %define m6  [pd_512]
>+  %define IDCT4_SHIFT 10
>+%else
>+  %error Unsupported BIT_DEPTH!
>+%endif

why do a new define on register name macro?
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