Bj�rn Haase wrote:
Am Donnerstag, 2. Juni 2005 14:57 schrieb Per Arnold Bl�smo:
Although I think it would have been best to have the possibilities to
support 24bits pointers in avr-gcc.
Per A.
The root of the problem, IMVHO is that what one is looking for in fact is not
only 24 bit pointers but various distinct classes of pointers, i.e. support
for different types of memories: Pointers to Ram (probably 16 bits wide),
Pointers to Flash (both 16 bits and 24 bits) Pointers to EEPROM (possibly
also in two flavours with 16 bits and 24 bits , etc.).
Presently, IIUC, gcc has support only for one single class of pointer: The
case for conventional C.
IMO, switching PMODE to PSImode (4-Byte integer, only partially used) is not a
solution since it would change the width of all pointers at the same time.
E.g. also RAM pointers and EEPROM pointers would happen to be 32 bits wide
what is certainly not useful.
A real solution of the issue would, IMO, require that someone adds
functionality for supporting different memory spaces within gcc's C/C++
front-end and gcc's mid-end.
You're right, that's the best, and most needed solution.
However, *is* it possible to have 24-bit pointers in GCC (as opposed to
32-bit)? How difficult would that be?
Thanks
Eric
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