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RedHat 9 (Linux i386) - man page for __setfpucw (redhat section 3)

__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 (floating 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 ISO 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 feclearex- cept, fegetexceptflag, feraiseexcept, fesetexceptflag, fetestexcept. If direct acces 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 ALSO
feclearexcept(3) /usr/include/i386/fpu_control.h i386 Linux Man Page 1997-03-08 __SETFPUCW(3)


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