Provided by: manpages-dev_3.35-0.1ubuntu1_all bug

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

CONFORMING TO

       This function was a nonstandard GNU extension.

NOTES

       As  of  glibc 2.1 this function does not exist anymore.  There are new functions from C99,
       with prototypes in <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.

       If  direct  access  to the FPU control word is still needed, the _FPU_GETCW and _FPU_SETCW
       macros from <fpu_control.h> 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)
       <fpu_control.h>

COLOPHON

       This page is part of release 3.35 of the Linux man-pages project.  A  description  of  the
       project,  and information about reporting bugs, can be found at http://man7.org/linux/man-
       pages/.