Hello,
The pdf for vectorclass recomands
"A special version of the vector class library for the Intel Knights Corner coprocessor has been developed at CERN. It is available from https://bitbucket.org/veclibknc/vclknc.git"
That version from git (2014) has nothing at "select" function in "vectori512_mic.h" and I think version 1.27 (2017) is up to date.
Maybe that sentence in pdf is old and can be update it.
thank you