__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(unsigned short control_word);

DESCRIPTION
       __setfpucw() transfers control_word to the registers of the FPU (float-
       ing-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  round-
       ing  modes,  like  fegetround(3), fesetround(3), and the floating-point
       environment, like fegetenv(3),  feholdexcept(3),  fesetenv(3),  feupda-
       teenv(3),  and  FPU exception handling, like feclearexcept(3), fegetex-
       ceptflag(3), feraiseexcept(3), fesetexceptflag(3), and fetestexcept(3).

       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 3.74 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       http://www.kernel.org/doc/man-pages/.

Linux                             2012-12-31                     __SETFPUCW(3)

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