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The add_dirac_obmc8_mmx function was the only MMX function left. This patch migrates it to SSE2. Here are the checkasm benchmark results: diracdsp.add_dirac_obmc_8_c: 2299.1 ( 1.00x) diracdsp.add_dirac_obmc_8_mmx: 237.6 ( 9.68x) diracdsp.add_dirac_obmc_8_sse2: 109.1 (21.07x) Signed-off-by: Kyosuke Kawakami <kawakami150708@gmail.com> Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>