GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
Debian 6.0.5(Squeeze) |
|
 |
__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, fesetround, and the floating-point environment, like fegetenv, feholdexcept, fesetenv, feupdateenv and FPU exception handling, like feclearexcept, fegetexceptflag, feraiseexcept, fesetexceptflag, fetestexcept.
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>
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
|
__setfpucw(3) | |