Здравствуйте, BeastInXmel, Вы писали:

MSDN

unsigned int _control87(
unsigned int new,
unsigned int mask
);
unsigned int _controlfp(
unsigned int new,
unsigned int mask
);

_MCW_PC (Precision control)

_PC_24 (24 bits)
_PC_53 (53 bits)
_PC_64 (64 bits)