It has applications on bare-bone embedded systems for handling interrupt routines for example. You still need to check your registers and restore them according

It has applications on bare-bone embedded systems for handling interrupt routines for example. You still need to check your registers and restore them according to the processors manual. You might also want to test performance since C compilers often generate good and fast code themselves. Otherwise it really should not be done. It is extremely unlikely that it helps with performance problems. The article list the exceptions. Perhaps add interrupts to that, since you always want them to return as fast as possible. Not really needed on a higher level platforms though.