Re: [Qemu-devel] Running QEMU on FreeBSD

[Bartosz Fabianowski]

I just discovered another problem with your patch.

Before applying your patch, I was using my own hack that resorted to 
normal precision doubles for FPU emulation. This resulted in incorrect 
rounding as could be easily seen when running Windows Update. The total 
number of megabytes to download was something like 10.99999999999998. 
Obviously, something had gone wrong with precision and rounding.

However, after I have applied your patch, which imports from Linux the 
functions required to use long doubles, the situation got worse. The 
total number of megabytes to be downloaded by Windows Update is now 
shown as NaN. I know from previous installs that it should be a 
moderately sized number, something such as 10 or 20 megabytes. So it's 
not the rounding of an immensely large number or of a ridiculously small 
one that is going wrong. There is some other issue surfacing here that 
makes a perfectly normal-sized floating point number become a NaN.

It's 2:30am here in Europe right now and I won't investigate this 
further tonight. But if you have time to, maybe you can have a look and 
see if you can find the source of this problem.

- Bartosz