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__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  rounding  modes,  like  fegetround(3),  fes-
       etround(3),  and  the  floating-point environment, like fegetenv(3), feholdexcept(3), fes-
       etenv(3), feupdateenv(3), and FPU exception handling, like feclearexcept(3),  fegetexcept-
       flag(3), feraiseexcept(3), fesetexceptflag(3), and fetestexcept(3).

       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 3.53 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					    2012-12-31				    __SETFPUCW(3)
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