On Mon, Oct 25, 2010 at 9:48 PM, Marcus Lindblom <ma...@yar.nu> wrote:
> 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.
I think this is taken care of by checking for the #define
_FPU_EXTENDED before any rounding macros would be #defined. At least
it seems to work on XP 64 bit. But I unfortunately don't know if Win 7
and/or the latest VS versions changed something related to the #define
_FPU_EXTENDED making the check for it break.
Cheers,
Ákos
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