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<H1><A NAME="SECTION00530000000000000000">
4.3 The Z80 and gbz80 port</A>
</H1>

<P>
SDCC can target both the Zilog Z80<A NAME="2934"></A> and the Nintendo GameBoy's
Z80-like gbz80<A NAME="2935"></A>. The Z80 port is passed
through the same <I>regressions tests<A NAME="2936"></A></I>
(see section <A HREF="node165.html#sec:Quality-control">7.8</A>) as the MCS51 and DS390 ports,
so floating point support, support for long variables and bitfield
support is fine. See mailing lists and forums about interrupt routines.

<P>
As always, the code is the authoritative reference - see z80/ralloc.c
and z80/gen.c. The stack<A NAME="2938"></A> frame is similar to that
generated by the IAR Z80 compiler. IX is used as the base pointer,
HL and IY are used as a temporary registers, and BC and DE are available
for holding variables. Return values<A NAME="2939"></A> for
the Z80 port are stored in L (one byte), HL (two bytes), or DEHL (four
bytes). The gbz80 port use the same set of registers for the return
values, but in a different order of significance: E (one byte), DE
(two bytes), or HLDE (four bytes).
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2011-03-20
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