From how I understand the code in SprmUtils.addSprm, the (instruction) type is 
derived from the highest three bits of the passed instruction. However, the 
bits are not right-shifted after the bit-and.

    int type = instruction & 0xe000;
    
    // SIN, ADD BEG
    // I guess the code is meant to read the top 3 bits and pack them in an 
int 0-7
    type >>= 13;
    // SIN, ADD END

(If this isn't bug report doesn't meet your standards, my apologies - just 
submitting my first one ...)

Cheers
Simon