Re: Supporting multiple pointer sizes in GCC

[Claudiu Zissulescu <claziss@gmail.com>]

Hi,

I would try using the named address space for your issue (see
TARGET_ADDR_SPACE_POINTER_MODE). Please check the SPU target for an
implementation example.

Regards,
Claudiu


On Mon, Mar 28, 2011 at 2:14 PM, Jayant R. Sonar
<Jayant.Sonar@kpitcummins.com> wrote:
>>?  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_koning@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.Sonar@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
>
>
>