"void __setfpucw((unsigned short) "control_word);
__setfpucw(0x1372)
Set fpu control word on i386 architecture to - extended precision - rounding to nearest - exceptions on overflow, zero divide and NaN
If direct acces to the FPU control word is still needed, the _FPU_GETCW and _FPU_SETCW macros from /usr/include/fpu_control.h can be used.