There isn't the information about the vector subspace in a format list of C++/SX compiler.

In the case of C++/SX's Format List, it print a status letter,"S" or "A" or "I", etc, in the order of descending priorities. Therefore, some letter sometimes are overwrote. About the letter "S", if there are both vectorized part and not un-vectorized part, it isn't printed.
Please refer the following manual about a detail.
C++/SX Programmer's Guide