Manpage of __SETFPUCW

__SETFPUCW

Section: Linux Programmer's Manual (3)
Updated: 2012-12-31
Index
 

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_wordto 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 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 rounding modes, like fegetround(3), fesetround(3), and the floating-point environment, like fegetenv(3), feholdexcept(3), fesetenv(3), feupdateenv(3), and FPU exception handling, like feclearexcept(3), fegetexceptflag(3), feraiseexcept(3), fesetexceptflag(3), and fetestexcept(3).

If direct access to the FPU control word is still needed, the _FPU_GETCWand _FPU_SETCWmacros 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>


 

Index

NAME
SYNOPSIS
DESCRIPTION
CONFORMING TO
NOTES
EXAMPLE
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 16:30:13 GMT, October 09, 2016 Click Here!