__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 non-standard 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.
This page is part of release 3.14 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
