question: public static InsnList cast ( final Type from , final Type to ) { InsnList list = new InsnList ( ) ; if ( from != to ) { if ( from == Type . DOUBLE_TYPE ) { if ( to == Type . FLOAT_TYPE ) { list . add ( new InsnNode ( Opcodes . D2F ) ) ; } else if ( to == Type . LONG_TYPE ) { list . add ( new InsnNode ( Opcodes . D2L ) ) ; } else { list . add ( new InsnNode ( Opcodes . D2I ) ) ; list . add ( cast ( Type . INT_TYPE , to ) ) ; } } else if ( from == Type . FLOAT_TYPE ) { if ( to == Type . DOUBLE_TYPE ) { list . add ( new InsnNode ( Opcodes . F2D ) ) ; } else if ( to == Type . LONG_TYPE ) { list . add ( new InsnNode ( Opcodes . F2L ) ) ; } else { list . add ( new InsnNode ( Opcodes . F2I ) ) ; list . add ( cast ( Type . INT_TYPE , to ) ) ; } } else if ( from == Type . LONG_TYPE ) { if ( to == Type . DOUBLE_TYPE ) { list . add ( new InsnNode ( Opcodes . L2D ) ) ; } else if ( to == Type . FLOAT_TYPE ) { list . add ( new InsnNode ( Opcodes . L2F ) ) ; } else { list . add ( new InsnNode ( Opcodes . L2I ) ) ; list . add ( cast ( Type . INT_TYPE , to ) ) ; } } else { if ( to == Type . BYTE_TYPE ) { list . add ( new InsnNode ( Opcodes . I2B ) ) ; } else if ( to == Type . CHAR_TYPE ) { list . add ( new InsnNode ( Opcodes . I2C ) ) ; } else if ( to == Type . DOUBLE_TYPE ) { list . add ( new InsnNode ( Opcodes . I2D ) ) ; } else if ( to == Type . FLOAT_TYPE ) { list . add ( new InsnNode ( Opcodes . I2F ) ) ; } else if ( to == Type . LONG_TYPE ) { list . add ( new InsnNode ( Opcodes . I2L ) ) ; } else if ( to == Type . SHORT_TYPE ) { list . add ( new InsnNode ( Opcodes . I2S ) ) ; } } } return list ; }
target:  Generates the instructions to cast a numerical value from one type to another.