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Besides giving a nice speedup over the MMX version, it also avoids processing unnecessarily much input and touching unnecessarily much output in the 2ch-4subbands case. calc_scalefactors_1ch_4subbands_c: 106.9 ( 1.00x) calc_scalefactors_1ch_4subbands_mmx: 46.7 ( 2.29x) calc_scalefactors_1ch_4subbands_sse4: 11.8 ( 9.05x) calc_scalefactors_1ch_8subbands_c: 220.5 ( 1.00x) calc_scalefactors_1ch_8subbands_mmx: 92.3 ( 2.39x) calc_scalefactors_1ch_8subbands_sse4: 23.8 ( 9.28x) calc_scalefactors_2ch_4subbands_c: 222.5 ( 1.00x) calc_scalefactors_2ch_4subbands_mmx: 139.3 ( 1.60x) calc_scalefactors_2ch_4subbands_sse4: 23.6 ( 9.41x) calc_scalefactors_2ch_8subbands_c: 440.3 ( 1.00x) calc_scalefactors_2ch_8subbands_mmx: 196.8 ( 2.24x) calc_scalefactors_2ch_8subbands_sse4: 46.5 ( 9.48x) The MMX version has been removed. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>