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Unfortunately a bit slower than the MMX version due to the impossibility to use memory operands in paddw. The situation would reverse if ff_dctB_mmx() would have to issue emms. dctB_c: 3.7 ( 1.00x) dctB_mmx: 3.3 ( 1.13x) dctB_sse2: 3.6 ( 1.03x) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>