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Conference decwet::nt-developers

Title:MS Windows NT Developers
Notice:See note 1222 for MS bug reporting info
Moderator:TARKIN::LINEIBER
Created:Mon Nov 11 1991
Last Modified:Tue Jun 03 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3247
Total number of notes:15633

3189.0. "NT -- 64 bit C++ support?" by CADSYS::BURKEY () Sun Feb 16 1997 21:02

Hi,

In the past I have heard references to 64 bit virtual addressing support to
be showing up in NT in the NT-V5 timeframe. Is this still on track?

Also, the more important question to me is will the Visual C++ compiler support
64 bit pointers at the time of release or will it be phased in at a later 
time.

Any information would be appreciated.

Dave.
T.RTitleUserPersonal
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3189.1check out syldra.jrd.dec.com/nt/nt64whit.htmDV780::LANGFELDTColoradicalMon Feb 17 1997 16:138
    
    The prelim draft of the white paper says that C/C++ compilers will 
    support seamless access to data in the VLM address space.
    
    Not a definitive answer, but it sounds like a "yes" to your 
    question.
    
    Sharon
3189.2DECWET::SCHREIBERDECeNTMon Feb 17 1997 19:416
    re .0: Is there some specific issue you are focusing on?  If so, it
    would be good if you could focus in on that.
    
    As far as the compiler availability, it would seem rather silly to have
    an operating system available with VLM support but no compiler to build
    apps for it!  What causes you to think that this might be an issue?
3189.3Because VMS C++ is not providing the supportCADSYS::BURKEYTue Feb 18 1997 10:2716
Hi,

Thanks for the responses...

The reason that I think this is an issue is because it appears to be what
the VMS C++ compiler group is in fact doing. If you read the turris::c_plus_plus
note number 2749.* (and particularly .7), it appears as if it is going to
be a while before we see 64 bit pointer support. 

Our group's tools sometimes has very large memory requirements. Additionally,
some of these tools have started to migrate to C++. If our tools start to
migrate to a non-VMS platform, it will be much more likely that it will be
to NT (rather than UNIX). So, I was just covering my bases by asking the
question.

Dave.
3189.4DECC::OUELLETTETue Feb 18 1997 19:392
For definitive answers about the availability of __ptr64 in a Visual C++
compiler on Alpha, contact the product manager, Eric Getsinger.