Hi Nikolay, On 1/24/19 3:09 PM, Nikolay Sivov wrote: > +int CDECL MSVCR120_ilogbl(LDOUBLE x) > +{ > +#ifdef HAVE_ILOGBL > + return ilogbl(x); Please use ilogb here, LDOUBLE is the same type as double. Also please set the errno on incorrect x values. Thanks, Piotr