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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((unsignedshort) 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(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 con-
       trol  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.

       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.

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



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