64 bit Intels?

Rayson Ho raysonlogin at yahoo.com
Mon Apr 22 12:44:01 EDT 2002


--- Joe Griffin <joe.griffin at mscsoftware.com> wrote:
> The Itanium is NOT 64 bit like a CRAY is 64 bit.
> It is an LP64 (longs and pointers).
> 
> In FORTRAN: INTEGERs and REALs are still 32 bits.
> 
> In C, int are still 32 bits.

Those are software issues, you can always define ints as 64-bit on IA64
if you know where to hack the gcc source.

Rayson

 
> You are allowed larger addressing because
> longs and pointers are 64 bits.
> 
> You may get 64 bit numberical accuracy
> in FORTRAN by use of "DOUBLE PRECISSION" but
> this capability is the same as on IA32 systems.
> The item you gain is that you have a
> bigger address space.
> 
> Regards,
> Joe
> 
> 
> Troy Baer wrote:
> > On Fri, 19 Apr 2002, Todd Henderson wrote:
> > 
> >>We are currently specing out a new cluster and since we have a
> corp. agreement with one of the big pc vendors, I
> >>thought I'd contact them.  They claim that the P4 Itanium is 64
> bit, only in the 733 and 800 mhz speeds.  Is
> >>Linux on Intel 64 bit for these processors?
> > 
> > 
> > The Itanium isn't a P4 derivative; it's a totally different
> architecture
> > that is in fact 64-bit.  Linux on them is 64-bit clean AFAIK.
> > 
> > 	--Troy
> 
> 
> 
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