Thanks for confirming.
> 2018-04-11 0:13 GMT-03:00 David Rowley <>:
> > I can recreate this when building with MSVC 2012. I confirm that I see
> > the same as you. Microsoft are setting errno to EDOM in the above 3
> > cases, where in Linux the result is still NaN, just the errno is not
> > set.
> >
> FWIW, I tested in MSVC 2017 (15.6.4) and it worked like expected.
> Looking at [1], it seems there could be nasty bugs when using math functions
> in MSVC < 2013 (or 2015). I don't have some older MSVC here to try
> /fp:OPTIONHERE [2] to see if it makes any difference.

Anyway currently PostgreSQL installers seem not be compiled with MSVC 2017, 
so it should be fix for current users?
I updated the patch as David Rowley mentioned.

Thanks and best regards,
Dang Minh Huong
NEC Solution Innovators, Ltd.

Attachment: dpow_NaN_V2.patch
Description: dpow_NaN_V2.patch

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