question: private static TranslationResult extractRegister ( final ITranslationEnvironment environment , final long offset , final String subRegister ) throws InternalTranslationException { final ArrayList < ReilInstruction > instructions = new ArrayList < ReilInstruction > ( ) ; final String parentRegister = getParentRegister ( subRegister ) ; final OperandSize archSize = environment . getArchitectureSize ( ) ; if ( isHigher8BitRegister ( subRegister ) ) { final String maskResult = environment . getNextVariableString ( ) ; final String shiftResult = environment . getNextVariableString ( ) ; instructions . add ( ReilHelpers . createAnd ( offset , archSize , parentRegister , OperandSize . WORD , "65280" , OperandSize . WORD , maskResult ) ) ; instructions . add ( ReilHelpers . createBsh ( offset + 1 , OperandSize . WORD , maskResult , OperandSize . WORD , "-8" , OperandSize . BYTE , shiftResult ) ) ; return new TranslationResult ( shiftResult , OperandSize . BYTE , TranslationResultType . REGISTER , null , instructions , offset ) ; } else { final OperandSize subRegisterSize = getRegisterSize ( subRegister ) ; final String mask = String . valueOf ( TranslationHelpers . getAllBitsMask ( subRegisterSize ) ) ; final String result = environment . getNextVariableString ( ) ; instructions . add ( ReilHelpers . createAnd ( offset , archSize , parentRegister , subRegisterSize , mask , subRegisterSize , result ) ) ; return new TranslationResult ( result , subRegisterSize , TranslationResultType . REGISTER , null , instructions , offset ) ; } }
target:  Extracts a subregister (like AX, AL, AH) from a parent register (like EAX)