Re: Compiler support for a faster interrupt response

yoon ji hoon_4S <yjh@news.kreonet.re.kr> writes:


> Whenever interrupt occurs, it is basically true that
> all global registers should be saved in the interrupt
> prolog and restored in the epilog.


Sounds basically false to me:


first of all only registers which are actually _used_ in the
                interrupt handler must be saved. Second thing interrupt
                handlers often check a few things (like a character being
                available somewhere or other change of state in devices) and
                this can be often done with very few registers, so you might
                be able to push the saving/restoring of registers down paths
                that are rarely executed.
--

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