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NAME | SYNOPSIS | DESCRIPTION | CONFORMING TO | NOTES | EXAMPLES | SEE ALSO | COLOPHON |
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__SETFPUCW(3) Linux Programmer's Manual __SETFPUCW(3)
__setfpucw - set FPU control word on i386 architecture (obsolete)
#include <i386/fpu_control.h>
void __setfpucw(unsigned short control_word);
__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.
This function was a nonstandard GNU extension.
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.
__setfpucw(0x1372)
Set FPU control word on the i386 architecture to
- extended precision
- rounding to nearest
- exceptions on overflow, zero divide and NaN
feclearexcept(3)
<fpu_control.h>
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Linux 2021-03-22 __SETFPUCW(3)
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