On 2010-10-25 16:16, Carsten Neumann wrote:
>       Hello Gerrit, all,
>
> On 10/25/2010 03:49 AM, Gerrit Voß wrote:
>> On Mon, 2010-10-25 at 10:23 +0200, Georg Wünsch wrote:
>>> we are having the same problem, it seems to have no impact neither in
>>> the debug nor the release version, but we are not sure, maybe in
>>> functionality we are not using.
>>
>> I'll upgrade and check. IIRC there were some changes when moving to
>> 64Bit Windows but the XP I'm using has not complained yet.
>
> hm, according to this
> <http://msdn.microsoft.com/en-us/library/e9b52ceh%28v=VS.100%29.aspx>
> floating point precision control is not supported on x64 platforms (do
> these processors still have an x87 FPU or do they do all floating point
> computations with the XMM/SSE units, hence without excess precision?).

IIUC, I think x64 only use SSE nowadays to avoid all that stack-based 
x87 horribleness. ;)

Visual C++ prefers SSE over x87 on 32-bit too if you tell it it's ok. :)
(the assembly looks way nicer too)

So that might indeed be the problem.

Cheers,
/Marcus




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