One of the reasons I greatly desired my next phone to be a Tegra 3 "4+1 cores" device was the (somewhat less advertized) 5th low-power core designed to prolong battery life by running low-power processes (e.g. email checking etc...).
Is there anything equivalent in Qualicomm's Snapdragon S4 that all the phone manufacturers use in US phones due to Tegra3 not having LTE?
P.S. In this question I'm not asking whether Tegra 3 is overall more power efficient than S4 is (I'm aware that lower-nm die process of S4 makes it more power efficient overall). I'm specifically asking if the S4 processor/chipset has a feature of dedicated lower-power core/processor for lower-requirements and background tasks.