Multiple Pins Interrupt ?

I try to expand the sample at https://industruino.com/forum/help-1/question/indio-digital-input-interrupt-usage-31 to use one interrupt for two pins.

How would these small comparsion routine look like to have multiple pins with one interrupt?

I tried reading PIN Resgisters but they never seem to change, will i have to use Indio.digitalRead() insteat?

Won't this be "slow" ?

 

EDIT:

I am using the 32u4 Topboard

If i read PINB - PINF with CH1-8 configured as input with no Voltage on any Chanel, it will look like this:

PINB: 10111111
PINC: 1000000
PIND: 11110111
PINE: 100000
PINF: 10010010

If i now put Vin on any chanel it looks like this:

PINB: 11111111
PINC: 1000000
PIND: 11110111
PINE: 100000
PINF: 10010010

The same bit on PINB will change no matter wich chanel i put Vin on !?

Indio.digitalRead() does not work within an interrupt, the programm will stop, if i set a flag within the intterupt routine and use Indio.digitalRead within the main loop that would be just as fast (slow) as polling in the main loop.

 

Edit2: OK i unterstand why PINB-PINF is useless (ind.i/o channels are set/polled via i2c) But since Indio.digitalRead does not work within an ISR How can i read the status of an Input?