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Index > Main > Differences between EMT64 and AMD64

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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Is there any difference between EMT64 and AMD64? I mean, any code for AMD64 will work for EMT64 and vice versa?

Regards,
LocoDelAssembly
Post 17 Oct 2005, 13:30
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7419
Location: Kraków, Poland
Tomasz Grysztar
In general, yes. There are some small differences, though. For example EM64T initially didn't include the NX bit feature - I haven't checked whether they added it, but in my opinion they really should. On the other hand, Intel included a few instructions that didn't exist in the AMD64 specification - like 80-bit far jumps and calls or CMPXCHG16B.
Post 17 Oct 2005, 13:52
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HyperVista



Joined: 18 Apr 2005
Posts: 691
Location: Virginia, USA
HyperVista
NX bit protection is now provided in EM64T. This link provides some documentation http://cache-www.intel.com/cd/00/00/14/93/149307_149307.pdf
Post 17 Oct 2005, 14:13
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MazeGen



Joined: 06 Oct 2003
Posts: 954
Location: Czechoslovakia
MazeGen
Check also this out.
Post 17 Oct 2005, 14:23
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Well apparently for user code there is no difference except for CMPXCHG16B and, LAHF & SAHF??? I have recently bought a new computer with Athlon64 Venice core (yes, it supports SSE3 Very Happy) so I will test LAHF & SAHF to see what happend. The problem is I don't have any 64 bit OS yet Sad

Thanks for the data guys!!
Post 18 Oct 2005, 13:00
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SDragon



Joined: 13 Sep 2005
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SDragon
Post 24 Oct 2005, 09:27
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7106
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vid
moved from Heap to Main
Post 03 Apr 2007, 22:11
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asmfan



Joined: 11 Aug 2006
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asmfan

_________________
Any offers?
Post 04 Apr 2007, 05:39
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m



Joined: 28 Dec 2006
Posts: 304
Location: in
m
vid wrote:
moved from Heap to Main

Vid how do you do that ?
Can I also move other people's threads ?
Plz !

_________________
Attitude!
Post 05 Apr 2007, 10:43
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7106
Location: Slovakia
vid
m: no, only moderators can do that
Post 05 Apr 2007, 10:51
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m



Joined: 28 Dec 2006
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m
How to become one ?
Post 05 Apr 2007, 10:56
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