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Besides simplifying address computations (it saves 432B of .text in hevcdsp.o alone here) it also fixes undefined behaviour that occurs if mx or my are 0 (happens when the filters are unused) because they lead to an array index of -1 in the old code. This happens in the checkasm-hevc_pel FATE-test. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com> Reviewed-by: Nuo Mi <nuomi2021@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>