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__SETFPUCW
!!!__SETFPUCW
NAME
SYNOPSIS
DESCRIPTION
EXAMPLE
AVAILABILITY
SEE ALSO
----
!!NAME


__setfpucw - set fpu control word on i386 architecture (obsolete)
!!SYNOPSIS


__#include __


__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''. These functions
don't have manpages, but are documented in the ''info''
docs.


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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Last edited on Tuesday, June 4, 2002 12:24:11 am by "perry"

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