Re: how many win64?

To add what Don said:

IA64 compilers try to add fixups whenever it can for unaligned data access.
It results in big performance penalty. I've observed that 7 instruction
bundles (21 instructions) were added to fix-up an 8-byte unaligned access.
AMD64 compiler won't do that.

Unaligned access in Itanium will BSOD while AMD64 won't. This is a big
difference between 2 platforms while you're playing with kernel code. Low
level kernel debug is very very different too.

Anyway, don't spend too much time and effort on Itanium. It doesn't worth.

---------------------------------
Calvin Guan, Windows DDK MVP
Software Engineer, NT Driver
ATI Technologies Inc. www.ati.com

"Don Burn" <burn@xxxxxxxxxxxxxxxx> wrote in message
news:Zyv7e.9$Gq6.8@xxxxxxxxxxx
> They have different instruction sets, so require you compile the driver
> with a different compiler. For a well written driver, there should be no
> difference, once it works on one architecture, it should work on the next.
> Of course supporting the different architectures is a good test of how
> well written your driver is!
>
>
> --
> Don Burn (MVP, Windows DDK)
> Windows 2k/XP/2k3 Filesystem and Driver Consulting
> Remove StopSpam from the email to reply
>
>
>
> "ma" <ma@xxxxxxxxxxx> wrote in message
> news:eIfMY$PQFHA.1096@xxxxxxxxxxxxxxxxxxxxxxx
>> Thanks for your reply.
>>
>> What is the difference between these two architectures?
>>
>> Is the window on these two platform works differently? (From the device
>> driver point of view)
>>
>>
>>
>> Best regards
>>
>>
>>
>> "Don Burn" <burn@xxxxxxxxxxxxxxxx> wrote in message
>> news:LVu7e.11815$_63.10809@xxxxxxxxxxx
>>> Yes, Windows supports the extended x86 architecture for 64 bits and
>>> Itanium. This is just like in the past when there were multiple 32-bit
>>> versions (x86, Mips, Power PC, Alpha).
>>>
>>>
>>> --
>>> Don Burn (MVP, Windows DDK)
>>> Windows 2k/XP/2k3 Filesystem and Driver Consulting
>>> Remove StopSpam from the email to reply
>>>
>>>
>>>
>>>
>>> "ma" <ma@xxxxxxxxxxx> wrote in message
>>> news:OADOzRPQFHA.2788@xxxxxxxxxxxxxxxxxxxxxxx
>>>> Hello,
>>>>
>>>> I searched around to find information about windows 64 and came
>>>> across some definitions which struck me that there is more than one
>>>> window 64. Am I correct?
>>>>
>>>>
>>>>
>>>> Here is a section that I found in a web site:
>>>>
>>>>
>>>>
>>>> Win64 AMD64/EM64T Unicode (Windows XP/2003 x64 Edition)
>>>>
>>>> Win64 IA64 Unicode (Windows XP/2003 64-bit Edition)
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Best regards
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>


.

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