__SETFPUCW(3)		   Linux Programmers Manual		__SETFPUCW(3)



NAME
       __setfpucw - set FPU control word on i386 architecture (obsolete)

SYNOPSIS
       #include 

       void __setfpucw(unsigned short control_word);

DESCRIPTION
       __setfpucw() transfers control_word to the registers of the FPU (float
       ing-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 non-standard GNU extension.

NOTES
       As  of  glibc  2.1 this function does not exist anymore.  There are new
       functions from C99, with prototypes in , to control FPU	round
       ing modes, like fegetround, fesetround, and the floating-point environ
       ment, like fegetenv, feholdexcept, fesetenv, feupdateenv and FPU excep
       tion handling, like feclearexcept, fegetexceptflag, feraiseexcept, fes
       etexceptflag, fetestexcept.

       If direct  access  to  the  FPU	control  word  is  still  needed,  the
       _FPU_GETCW and _FPU_SETCW macros from  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)
       

COLOPHON
       This  page  is  part of release 3.05 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)