__SETFPUCW(3)						     Linux Programmer's Manual						     __SETFPUCW(3)

NAME

       __setfpucw - set fpu control word on i386 architecture (obsolete)

SYNOPSIS

       #include <i386/fpu_control.h>

       void __setfpucw((unsigned short) control_word);

DESCRIPTION

       __setfpucw transfers control_word to the registers of the fpu (floating point unit) on i386 architecture. This was used to control floating
       point precision, rounding and floating point exceptions.

EXAMPLE

       __setfpucw(0x1372)

       Set fpu control word on i386 architecture to
	    - extended precision
	    - rounding to nearest
	    - exceptions on overflow, zero divide and NaN

AVAILABILITY

       As of glibc 2.1 this function does not exist anymore.  There are new functions from ISO C99, with  prototypes  in  /usr/include/fenv.h,	to
       control fpu rounding modes, like fegetround, fesetround, and the floating point environment, like fegetenv, feholdexcept, fesetenv, feupda-
       teenv and fpu exception handling, like feclearexcept, fegetexceptflag, feraiseexcept, fesetexceptflag, fetestexcept.

       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.

SEE ALSO

       feclearexcept(3)
       /usr/include/i386/fpu_control.h

i386 Linux Man Page						    1997-03-08							     __SETFPUCW(3)