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VC Registers and calling assembly function from c/C++

in spru514j.pdf it lists in section 7.2.1 the registers and how they are saved or not.  How are the VCU  Registers affected?  (spruhs1a.pdf)  Since it's a special unit are they unused by the C/C++ environment, so can I assume it is okay to use them, and leave them in any state when the assembly routine is complete?