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955277020f
The approach of this ASM routine is to process two channels at a time using
AVX instructions. Obviously, there is no point in doing this if there is only
a single channel; in which case the scalar loop would be better.
Fixes a performance regression when filtering mono audio on certain CPUs,
notably e.g. the Intel N100.
(cherry picked from commit f3346ca6f7)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>