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__SETFPUCW |
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!!!__SETFPUCW |
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NAME |
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SYNOPSIS |
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DESCRIPTION |
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EXAMPLE |
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AVAILABILITY |
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SEE ALSO |
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---- |
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!!NAME |
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__setfpucw - set fpu control word on i386 architecture (obsolete) |
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!!SYNOPSIS |
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__#include __ |
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__void __setfpucw((unsigned short)__ |
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''control_word''__);__ |
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!!DESCRIPTION |
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____setfpucw__ transfers ''control_word'' to the |
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registers of the fpu (floating point unit) on i386 |
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architecture. This was used to control floating point |
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precision, rounding and floating point |
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exceptions. |
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!!EXAMPLE |
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____setfpucw(0x1372)__ |
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Set fpu control word on i386 architecture to |
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- extended precision |
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- rounding to nearest |
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- exceptions on overflow, zero divide and NaN |
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!!AVAILABILITY |
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As of glibc 2.1 this function does not exist anymore. There |
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are new functions from ISO C99, with prototypes in |
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''/usr/include/fenv.h'', to control fpu rounding modes, |
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like ''fegetround'', ''fesetround'', and the floating |
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point environment, like ''fegetenv'', |
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''feholdexcept'', ''fesetenv'', ''feupdateenv'' and |
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fpu exception handling, like ''feclearexcept'', |
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''fegetexceptflag'', ''feraiseexcept'', |
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''fesetexceptflag'', ''fetestexcept''. These functions |
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don't have manpages, but are documented in the ''info'' |
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docs. |
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If direct acces to the FPU control word is still needed, the |
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_FPU_GETCW and _FPU_SETCW macros from |
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''/usr/include/fpu_control.h'' can be used. |
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!!SEE ALSO |
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feclearexcept(3)'' |
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/usr/include/i386/fpu_control.h'' |
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---- |
