More efficient calling conventions have been a frequently requested improvement for the z80 port. However, changing the calling convention breaks compability with exisiting asm libraries, so it should not be done often. And finding the best calling convention will take a bit of work. However, for now, I implemented support for the calling conventions that are already in use by z88dk for the z80, z180, r2k, r3ka and tlcs90 ports:
__z88dk_fastcall and __z88dk_callee The first one can be used on functions that have exactly one argument of at most 32 bits. This argument will be passed in the lower bytes of dehl. It is now fully supported in sdcc. The second one omits the stack cleanup for stack parameters in the caller. It is currently only supported on the caller side (and thus only useful for calling hand-written asm functions). Please use sdcc 3.4.3 #9218 or later if you want to try these calling conventions. Philipp
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