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<H2><A NAME="SECTION004142000000000000000">
3.14.2 Registers usage</A>
</H2>

<P>
Unless the called function is declared as <TT>_naked</TT><A NAME="2367"></A>,
or the --callee-saves<A NAME="2368"></A>/--all-callee-saves
command line option or the corresponding callee_saves pragma are
used, the caller will save the registers (<I>R0-R7</I>) around the
call, so the called function can destroy they content freely.

<P>
If the called function is not declared as <TT>_naked</TT>, the caller
will swap register banks around the call, if caller and callee use
different register banks (having them defined by the <TT>_using</TT>
modifier). 

<P>
The called function can also use <I>DPL</I>, <I>DPH</I>, <I>B</I>
and <I>ACC</I> observing that they are used for parameter/return value
passing.

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2011-03-20
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