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They're using a file of #defines. https://github.com/apennisi/fastestpedestriandetectorinthewest/blob/master/src/sse.hpp
Since that's a small subset of SSE, it should be trivial to copy the file, rename it NEON, and replace the include with a #ifdef ARM or whatever, and replace the SSE instructions with NEON. Conveniently, someone has made a guide showing exactly what maps to what. http://codesuppository.blogspot.com/2015/02/sse2neonh-porting-guide-and-header-file.html
