iOS Identifying if the device is 64 bit Chipset programmatically

Part of my project, had to identify whether the device chipset is 64 bit architecture. Beginning from A7 chipset, Apple has  64 bit hardware architecture. Based on this chipset, the devices in market  as of now are

iPhone 5S,
iPad mini 2
iPad mini 3
iPad Air

Apple has introduced A8 chipset on their below models which are also desktop class 64 bit architecture.

iPhone 6
iPhone 6 Plus

To figure out programatically whether the device is running on 64 bit architecture, code at the given link can be used. Note that this is available on various stack over flow forums and i just colleged all into one.

http://goo.gl/PfqJwk

References:
http://en.wikipedia.org/wiki/List_of_iOS_devices
http://en.wikipedia.org/wiki/Apple_A7#Products_that_include_the_Apple_A7