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   __setfpucw    ( 3 )

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Имя (Name)

__setfpucw - set FPU control word on i386 architecture (obsolete)

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Синопсис (Synopsis)

#include <i386/fpu_control.h>

       void __setfpucw(unsigned short control_word);

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Описание (Description)

__setfpucw() transfers control_word to 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.

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Стандарты (Conforming to)

This function was a nonstandard GNU extension.

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Примечание (Note)

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_GETCW and _FPU_SETCW macros from <fpu_control.h> can be
       used.

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Примеры (Examples)

__setfpucw(0x1372)

       Set FPU control word on the i386 architecture to
            - extended precision
            - rounding to nearest
            - exceptions on overflow, zero divide and NaN

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Смотри также (See also)

feclearexcept(3)

       <fpu_control.h>

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