__setfpucw(3) -- Linux man page
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
feclearexcept,
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
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