| From: | Alexander G. M. Smith |
| Date: | 10 Sep 2000 at 19:45:59 |
| Subject: | RE: AMIOPEN: has anyone run SPEC benchmark using VP? |
Guillermo Rodriguez Garcia <guille@iies.es> wrote on
Fri, 08 Sep 2000 10:49:01 +0200:
>>I believe that VP by design uses 64-bit registers.
>>I.e., a C "long" integer in VP is represented by a
>>64 bit register. Presumably the same goes for
>>pointers. So there is no problem of addressing
>>more than 4 gigabytes of memory.
>
>longs are 64 bits in VP, but both ints and
>pointer regs are 32 bit.
While reading the SDK book (2nd edition, page 167),
I noticed that the kernel device ID is a 64 bit value
with the least significant 32 bits being a pointer to
an instance, and the high 32 bits being a processor ID.
So, even if they switch pointers to 64 bits, other things
will break. Looks like we'll be stuck with 32 bit pointers
for a while.
- Alex
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