.\" Written Sat Mar  8 10:35:08 MEZ 1997 by J. "MUFTI" Scheurich (mufti@csv.ica.uni-stuttgart.de)
.TH __SETFPUCW 3 1997-03-08 "i386 Linux Man Page" "Linux Programmer's Manual"
.SH NAME
__setfpucw \- set fpu control word on i386 architecture (obsolete)
.SH SYNOPSIS
.B #include <i386/fpu_control.h>
.sp
.BI "void __setfpucw((unsigned short) " control_word );
.br
.SH DESCRIPTION
.B __setfpucw
transfers
.I 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.
.SH EXAMPLE

.BR __setfpucw(0x1372)

Set fpu control word on i386 architecture to
.br
     - extended precision
.br     
     - rounding to nearest
.br     
     - exceptions on overflow, zero divide and NaN
.br 
.SH AVAILABILITY
As of glibc 2.1 this function does not exist anymore.
There are new functions from ISO C99, with prototypes in
.IR /usr/include/fenv.h ,
to control fpu rounding modes, like
.IR fegetround ,
.IR fesetround ,
and the floating point environment, like
.IR fegetenv ,
.IR feholdexcept ,
.IR fesetenv ,
.IR feupdateenv 
and fpu exception handling, like
.IR feclearexcept ,
.IR fegetexceptflag ,
.IR feraiseexcept ,
.IR fesetexceptflag ,
.IR fetestexcept .
.PP
If direct access to the FPU control word is still needed, the _FPU_GETCW
and _FPU_SETCW macros from
.I /usr/include/fpu_control.h
can be used.
.SH "SEE ALSO"
.BR feclearexcept (3)
.br
.IR /usr/include/i386/fpu_control.h