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/* Lookup tables for mapping signed to unsigned, and clamping */
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static unsigned char real_uvlut[256], *uvlut;
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static unsigned char real_ylut[768], *ylut;
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/* Define some constants used in MMX range mapping and clamping logic */
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static mmx_t mmx_0x10s = (mmx_t) 0x1010101010101010LL,
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mmx_0x0080s = (mmx_t) 0x0080008000800080LL,