__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 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 C99, with prototypes in /usr/include/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 /usr/include/fpu_control.h can be
used.
SEE ALSOfeclearexcept(3)
/usr/include/i386/fpu_control.h
i386 Linux Man Page 1997-03-08 __SETFPUCW(3)
