question: public DalvInsn expandedSuffix ( BitSet compatRegs ) { if ( hasResult ( ) && ! compatRegs . get ( 0 ) ) { RegisterSpec r = registers . get ( 0 ) ; return makeMove ( position , r , r . withReg ( 0 ) ) ; } else { return null ; } }
target:  Gets the instruction suffix required, if any, to use in an expanded version of this instance. Will not generate a move for a register marked compatible to the format by the given BitSet.