Rechercher une page de manuel
__setfpucw
Langue: en
Version: 1997-03-08 (debian - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
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 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.
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 3.21 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/.Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre