NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]

       #include <i386/fpu_control.h>

       void __setfpucw((unsigned short) control_word);

DESCRIPTION    [Toc]    [Back]

       __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    [Toc]    [Back]

       __setfpucw(0x1372)

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

AVAILABILITY    [Toc]    [Back]

       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,  fegetexceptflag,
       feraiseexcept, fesetexceptflag, fetestexcept.   These  functions  don't
       have manpages, but are documented in the info docs.

       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    [Toc]    [Back]

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



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