>? MIPS has two pointer sizes, but a given compilation (gcc > invocation) uses only one of them, it comes from the chosen ABI.
Yes, it looks like MIPS have got 2 ABIs - 32bit and 64bit. The choice of the ABI is controlled through a command line option '-march=arch'. Therefore in MIPS it doesn't look possible to have 2 pointers of different sizes existing simultaneously inside a single executable. Whereas, what I am looking forward to do is adding some target specific data attributes, say data16 and data32. In a simple test case I should be able to declare two different pointer variables using these attributes as following: char * ptrABC __attribute__ (data16); char * ptrXYZ __attribute__ (data32); The size of ptrABC should be 16bits and that of ptrXYZ should be 32bits. Will it be possible to do something like this in GCC? Regards, Jayant -----Original Message----- From: Paul Koning [mailto:paul_kon...@dell.com] Sent: Friday, March 25, 2011 11:20 PM To: DJ Delorie Cc: Jayant R. Sonar; gcc@gcc.gnu.org Subject: Re: Supporting multiple pointer sizes in GCC On Mar 25, 2011, at 1:37 PM, DJ Delorie wrote: > > "Jayant R. Sonar" <jayant.so...@kpitcummins.com> writes: >> Is it possible to support multiple pointer sizes (e.g. 16bit, 32bit) >> which can co-exist in single compilation unit? >> Whether it is supported in GCC now? >> Is there any other architecture which has this feature already >> implemented? > > Yes, there are three that I know of - mips64, s390 (tpf), and m32c. ? MIPS has two pointer sizes, but a given compilation (gcc invocation) uses only one of them, it comes from the chosen ABI. paul
