Mail from yangzhh@mail.ustc.edu.cn.

I want to control the unroll factor using the command line flag “-force-vector-unroll”, such as "clang -mllvm -force-vector-unroll=2", but produce an error: " clang-4.0: error: unknown argument: '-force-vector-unroll=2' " . could you help me ?

The option got renamed to -force-vector-interleave. That said, we shouldn't be advertising -mllvm options in the first place... I'll look into updating http://llvm.org/docs/Vectorizers.html .

-Eli