__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 the i386 architecture.  This was used to control
       floating-point precision, rounding and floating-point exceptions.

CONFORMING TO

       This function was a nonstandard GNU extension.

NOTES

       As of glibc 2.1 this function does not exist anymore.  There are new functions from C99, with prototypes in <fenv.h>, to control FPU round-
       ing  modes,  like  fegetround,  fesetround,  and the floating-point environment, like fegetenv, feholdexcept, fesetenv, feupdateenv and FPU
       exception handling, like feclearexcept, fegetexceptflag, feraiseexcept, fesetexceptflag, fetestexcept.

       If direct access to the FPU control word is still needed, the _FPU_GETCW and _FPU_SETCW macros from <fpu_control.h> can be used.

EXAMPLE

       __setfpucw(0x1372)

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

SEE ALSO

       feclearexcept(3)
       <fpu_control.h>

COLOPHON

       This page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    1997-03-08							     __SETFPUCW(3)