3.3.9 Z80 Options (apply to z80, z180,
r2k and r3ka port)
- [--portmode=<Value>] Determinate
PORT I/O mode (<Value> is z80 or z180).
- [--asm=<Value>] Define
assembler name (<Value> is rgbds, sdasz80, isas or z80asm).
- [--reserve-regs-iy] This
option tells the compiler that it is not allowed to use register pair
iy. The option can be useful for systems where iy is reserved for
the OS. This option is incompatible with --fomit-frame-pointer.
- [--oldralloc] Use
old register allocator. The old register allocator typically is faster
than the current one, but the current one generates better code. This
differences are the strongest, when a high value for --max-allocs-per-node
is used.
- [--fno-omit-frame-pointer] Never
omit the frame pointer.