__setfpucw

__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 (float-
       ing point unit) on i386 architecture. This was used to control  float-
       ing 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,
       feupdateenv  and	 fpu exception handling, like feclearexcept, fegetex-
       ceptflag, 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)