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
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"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
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"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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