[gmx-developers] 3Dnow! trouble

Erik Lindahl lindahl at stanford.edu
Mon May 20 19:05:41 CEST 2002

Frank Wennmohs wrote:

>On Sat, May 18, 2002 at 02:51:43PM +0200, David van der Spoel wrote:
>>On Sat, 18 May 2002, Frank Wennmohs wrote:
>>>Hello all!
>>>I just ran into trouble in a simple md run while
>>>using 3Dnow! on an Athlon processor.
>>>The energies suddenly became excessively high (>1E+20).
>>>This just happens from time to time. Disabling the assembly
>>>loops everything runs smoothly. This does not happen
>>>when using SSE on AthlonMP.
>>>The error happened on a FreeBSD-4.5 box.
>>>I remember something about errors in the assembly loops 
>>>some (longer) time ago. 
Hi Frank,

I can have a look at it, but I would need a very short tpr file that 
reproduces the problem, preferrably a simple system that only calls one 
inner loop.



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