__SETFPUCW(W)       Linux Programmer's Manual       __SETFPUCW(W)



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

EXAMPLE
       __setfpucw(w)

       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  environ-
       ment,  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(t)
       /usr/include/i386/fpu_control.h



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