1__SETFPUCW(3)              Linux Programmer's Manual             __SETFPUCW(3)
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NAME

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

9       #include <i386/fpu_control.h>
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11       void __setfpucw((unsigned short) control_word);
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DESCRIPTION

14       __setfpucw() transfers control_word to the registers of the fpu (float‐
15       ing point unit) on i386 architecture. This was used to control floating
16       point precision, rounding and floating point exceptions.
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EXAMPLE

19       __setfpucw(0x1372)
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21       Set fpu control word on i386 architecture to
22            - extended precision
23            - rounding to nearest
24            - exceptions on overflow, zero divide and NaN
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AVAILABILITY

27       As  of  glibc  2.1 this function does not exist anymore.  There are new
28       functions from C99, with prototypes in /usr/include/fenv.h, to  control
29       fpu rounding modes, like fegetround, fesetround, and the floating point
30       environment, like fegetenv, feholdexcept, fesetenv, feupdateenv and fpu
31       exception handling, like feclearexcept, fegetexceptflag, feraiseexcept,
32       fesetexceptflag, fetestexcept.
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34       If direct  access  to  the  FPU  control  word  is  still  needed,  the
35       _FPU_GETCW and _FPU_SETCW macros from /usr/include/fpu_control.h can be
36       used.
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SEE ALSO

39       feclearexcept(3)
40       /usr/include/i386/fpu_control.h
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44i386 Linux Man Page               1997-03-08                     __SETFPUCW(3)