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__SETFPUCW(3) | Linux Programmer's Manual | __SETFPUCW(3) |
NAME¶
__setfpucw - set FPU control word on i386 architecture (obsolete)SYNOPSIS¶
#include <i386/fpu_control.h>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.CONFORMING TO¶
This function was a nonstandard GNU extension.NOTES¶
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.EXAMPLE¶
__setfpucw(0x1372)- extended precision
- rounding to nearest
- exceptions on overflow, zero divide and NaN
SEE ALSO¶
feclearexcept(3)COLOPHON¶
This page is part of release 3.44 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/.1997-03-08 | Linux |