__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 environ
ment, like fegetenv, feholdexcept, fesetenv, feupdateenv
and fpu exception handling, like feclearexcept, fegetex
ceptflag, 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
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