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* sbc: add iwmmxt optimization for sbc for pxa series cpuSiarhei Siamashka2011-03-141-0/+42
Benchmarked on ARM PXA platform: === Before (4 bands) ==== $ time ./sbcenc_orig -s 4 long.au > /dev/null real 0m 2.44s user 0m 2.39s sys 0m 0.05s === After (4 bands) ==== $ time ./sbcenc -s 4 long.au > /dev/null real 0m 1.59s user 0m 1.49s sys 0m 0.10s === Before (8 bands) ==== $ time ./sbcenc_orig -s 8 long.au > /dev/null real 0m 4.05s user 0m 3.98s sys 0m 0.07s === After (8 bands) ==== $ time ./sbcenc -s 8 long.au > /dev/null real 0m 1.48s user 0m 1.41s sys 0m 0.06s === Before (a2dp usage) ==== $ time ./sbcenc_orig -b53 -s8 -j long.au > /dev/null real 0m 4.51s user 0m 4.41s sys 0m 0.10s === After (a2dp usage) ==== $ time ./sbcenc -b53 -s8 -j long.au > /dev/null real 0m 2.05s user 0m 1.99s sys 0m 0.06s